toaz.info_new_eim_cblm_core_final_final_2_pr_19fabd2b103e5e1ca524fcd240e57a86.pdf.pdf

Competency – Based
Learning Material
Electrical Installation& Maintenance NC II
Core Competencies
(196 HOURS)

TABLE OF CONTENT
Page
Modules of Instruction...........................................................................1-
 CORE COMPETENCIES..............................................................2-3
o Perform roughing-in, wiring and cabling works
for single-phase distribution, power, lighting
and auxiliary systems
4-27
o Install electrical protective devices for
distribution, power, lighting, auxiliary, lightning
protection and grounding systems 28-39
o Install wiring devices of floor and wall mounted
outlets, lighting fixtures/switches and auxiliary
outlets 40-83
 DEFINATION …………………….……………..………..112
 REFERENCES…………………….……………..………..112
ELECTRONIC INSTALLATION&
MAINTENANCE NCII
(Amended)
Developed and Issued By:
EXACT COLLEGE OF ASIA
Date
Developed:
2018
Page 2

HOW TO USE THIS COMPETENCY BASED LEARNING MATERIAL
Welcome to the module in “ELECTRICAL INSTALLATION&MAINTENANCE
NCII”. This module contains the basic, common and core competency
training materials and activities for you to complete.
Learners are required to go through a series of learning in order to complete
the learning outcomes of this module. The author has prepared Information
Sheets, Self-Checks, Operation Sheets and Job Sheets. The learners must
follow these activities at your own risk. If you have questions, please don’t
hesitate to ask your trainer for assistance.
The goal of this course is to development practical skills and demonstration.
To gain these skills, learners must learn basic concepts and terminology.
For most part, you’ll get some of this information from the information
sheets and TESDA website, www.tesda.gov.ph.
This module has prepared to help the learner to achieve the required basic,
common and core competency in “ELECTRICAL INSTALLATION &
MAINTENANCE NCII”.
This will also the source of information for each learner to acquire
knowledge and skills in this particular competency independently and at
your own pace, with minimum supervision or help from the trainer.

CORE COMPETENCIES
(154 Hours)
Unit of Competency Learning Outcomes Methodologies
Assessment
Methods
Nominal
Duration
1. Perform roughing-
in, wiring and
cabling works for
single-phase
distribution, power,
lighting and
auxiliary systems
1.1 Install electrical
metallic /non-
metallic (PVC
conduit)
 Lecture
 Demonstratio
n
 Modular
(self-paced)
 Dualized-
training
 PowerPoint/
Video
presentation
 Written test or
examination
 Direct
observation and
questioning
 Demonstration
(able to impart
knowledge and
skills)
 Project method
 Practical Lab/
Exercises
16 hours
1.2 Install wire ways and
cable tray
 Lecture
 Demonstratio
n
 Modular
(self-paced)
 Dualized-
training
 PowerPoint/
Video
presentation
 Written test or
examination
 Direct
observation and
questioning
 Demonstration
(able to impart
knowledge and
skills)
 Project method
 Practical Lab/
Exercises
16 hours
1.3 Install auxiliary
terminal cabinet and
distribution panel
 Lecture
 Demonstratio
n
 Modular
(self-paced)
 Dualized-
training
 PowerPoint/
Video
presentation
 Written test or
examination
 Direct
observation and
questioning
 Demonstration
(able to impart
knowledge and
skills)
 Project method
 Practical Lab/
Exercises
12 hours
1.4 Prepare for cable
pulling and
installation
 Lecture
 Demonstratio
n
 Modular
(self-paced)
 Dualized-
training
 PowerPoint/
Video
 Written test or
examination
 Direct
observation and
questioning
 Demonstration
(able to impart
knowledge and
6 hours

Assessment
Methods
Nominal
Duration
presentation skills)
 Practical Lab/
Exercises
1.5 Perform wiring and
cabling lay out
 Lecture
 Demonstratio
n
 Modular
(self-paced)
 Dualized-
training
 Group
discussion
 PowerPoint/
Video
presentation
 Written test or
examination
 Direct
observation and
questioning
 Demonstration
(able to impart
knowledge and
skills)
 Project method
 Practical Lab/
Exercises
16 hours
1.6 Notify completion of
work
 Lecture
 Demonstratio
n
 Modular
(self-paced)
 Group
discussion
 Written test or
examination
 Direct
observation and
questioning
 Demonstration
(able to impart
knowledge and
skills)
 Practical Lab/
Exercises
4 hours
2. Install electrical
protective devices
for distribution,
power, lighting,
auxiliary, lightning
protection and
grounding systems
2.1 Plan and prepare
work
 Lecture
 Demonstratio
n
 Modular
(self-paced)
 Dualized-
training
 Group
discussion
 PowerPoint/
Video
presentation
 Written test or
examination
 Direct
observation and
questioning
 Demonstration
(able to impart
knowledge and
skills)
8 hours

Assessment
Methods
Nominal
Duration
2.2 Install electrical
protective devices
 Lecture
 Demonstratio
n
 Modular
(self-paced)
 Dualized-
training
 Group
discussion
 PowerPoint/
Video
presentation
 Written test or
examination
 Direct
observation and
questioning
 Demonstration
(able to impart
knowledge and
skills)
 Project method
 Practical Lab/
Exercises
16 hours
2.3 Install lighting fixture
and auxiliary outlet
 Lecture
 Demonstratio
n
 Modular
(self-paced)
 Dualized-
training
 Group
discussion
 PowerPoint/
Video
presentation
 Written test or
examination
 Direct
observation and
questioning
 Demonstration
(able to impart
knowledge and
skills)
 Project method
 Practical Lab/
Exercises
16 hours
work
 Lecture
 Demonstratio
n
 Modular
(self-paced)
 Dualized-
training
 Group
discussion
 Written test or
examination
 Direct
observation and
questioning
 Demonstration
(able to impart
knowledge and
skills)
 Practical Lab/
Exercises
4 hours

Assessment
Methods
Nominal
Duration
3. Install wiring
devices of floor
and wall mounted
outlets, lighting
fixtures/switches
and auxiliary
outlets
3.1 Select wiring
devices
 Lecture
 Demonstratio
n
 Modular
(self-paced)
 Dualized-
training
 Group
discussion
 PowerPoint/
Video
presentation
 Written test or
examination
 Direct
observation and
questioning
 Demonstration
(able to impart
knowledge and
skills)
 Project method
 Practical Lab/
Exercises
4 hours
3.2 Install wiring
devices
 Lecture
 Demonstratio
n
 Modular
(self-paced)
 Dualized-
training
 Group
discussion
 PowerPoint/
Video
presentation
 Written test or
examination
 Direct
observation and
questioning
 Demonstration
(able to impart
knowledge and
skills)
 Project method
 Practical Lab/
Exercises
16 hours
3.3 Install lighting
fixtures/switches
 Lecture
 Demonstratio
n
 Modular
(self-paced)
 Dualized-
training
 Group
discussion
 PowerPoint/
Video
presentation
 Written test or
examination
 Direct
observation and
questioning
 Demonstration
(able to impart
knowledge and
skills)
 Project method
 Practical Lab/
Exercises
16 hours

Assessment
Methods
Nominal
Duration
work
 Lecture
 Demonstratio
n
 Modular
(self-paced)
 Dualized-
training
 Group
discussion
 Written test or
examination
 Direct
observation and
questioning
 Demonstration
(able to impart
knowledge and
skills)
 Practical Lab/
Exercises
4 hours

CORE COMPETENCIES:
Units of Competency Module Title Code
1. Perform roughing-in, wiring and
cabling works for single-phase
distribution, power, lighting and
auxiliary systems
1.1 Performing roughing-in, wiring and cabling works
for single-phase distribution, power, lighting and
auxiliary systems
ELC741301
2. Install electrical protective devices
for distribution, power, lighting,
auxiliary, lightning protection and
grounding systems
2.1 Installing electrical protective devices for
distribution, power, lighting, auxiliary, lightning
protection and grounding systems
ELC741302
3. Install wiring devices of floor and
wall mounted outlets, lighting
fixtures/switches and auxiliary
outlets
3.1 Installing wiring devices of floor and wall
mounted outlets, lighting fixtures/switches and
auxiliary outlets
ELC741303
MODULE CONTENT
UNIT OF COMPETENCY : Perform roughing-in, wiring and cabling works for single-phase
distribution, power, lighting and auxiliary systems
MODULE TITLE : Performing roughing-in, wiring and cabling works for single-
phase distribution, power, lighting and auxiliary systems
MODULE DESCRIPTION : This unit covers the knowledge, skills and attitudes on
installing electrical metallic and non-metallic conduit, wire
ways and cable clamp, auxiliary terminal cabinet and
distribution framepanel board/safety switch and used in
roughing-in based on the required performance standards. This
unit also covers the outcomes required in preparing for cable
pulling and installation, performing wiring and cabling lay-out
and notifying completion of work for single-phase distribution,
power, lighting and auxiliary systems.
NOMINAL DURATION : hours
SUMMARY OF LEARNING OUTCOMES:
Upon completion of the module the trainees/student should be able to:
LO1. Install electrical metallic /nonmetallic (PVC conduit)
LO2. Install wire ways and cable tray.
LO3. Install auxiliary terminal cabinet and distribution panel
LO4. Prepare for cable pulling and installation
LO5. Perform wiring and cabling lay out
LO6. Notify completion of work
LEARNING OUTCOME SUMMARY NUMBER 1.1.1
LO1. INSTALL ELECTRICAL METALLIC /NON- METALLIC (PVC CONDUIT)
ASSESSMENT CRITERIA:
1. Correct drawings are interpreted based on job requirements

2. Correct quantities of conduit, fittings and accessories are determined
as per job requirements
3. Tools and equipment are selected as per job requirements
4. Conduit is assembled ensuring that fittings are fully inserted and
tightened as per job requirements
5. Conduit is bent with bends not exceeding 90° as per job requirements
6. Conduit couplings and elbows are installed as per job requirements
7. Conduit is threaded in line with job requirements
8. Safety procedures are followed in line with standard operating procedures
(SOPs.
CONTENTS:
 Interpret electrical wiring diagrams and mechanical drawings
 Identify proper usage and types of conduits, fittings in electrical
installation.
 Identify technique of installation and bending of conduit and fitting.
 Apply proper usage of safety harness.
 Interpret plan and details drawing.
 Practice proper handling of materials, tools and equipment
 Practice procedure in proper bending of conduits
 Practice procedure in Installing conduits
 Perform the installation economically
CONDITIONS:
Students/trainees must be provided with the following:
 Tools and Equipment
o Lineman’s pliers
o Long nose pliers
o Diagonal cutting pliers
o Set of screw driver
o Claw hammer
o Hacksaw
o Measuring tools
o Pipe vise
o Pipe cutter
o reamer
o Simulated
workplace/wiring booth
o Ladder
 Materials
o Electrical metallic conduits
o lock nuts, bushing, adapters
o fastening devices
o Conduit supports
 Learning Materials
o Learning elements
o Manuals
o Books and
o Philippine Electrical
Code/National Electrical Code,
Latest Edition
METHODOLOGIES:
 Lecture
 Demonstration
 Modular (self-paced)

 Dualized-training
 PowerPoint/Video presentation
ASSESSMENT METHODS:
 Written test or examination
 Direct observation and questioning
 Demonstration (able to impart knowledge and skills)
 Project method
 Practical Lab/ Exercises
INFORMATION SHEET NUMBER 1.1.1:
INTERPRET ELECTRICAL WIRING DIAGRAMS AND MECHANICAL
DRAWINGS
CIRCUIT DRAWINGS AND WIRING DIAGRAMS
Description
Successfully performing electrical work requires the ability to read and interpret many
different types of drawings and diagrams. Understanding circuit symbols and
components is another one of the basic building blocks needed to become an electrician.
If an electrician misinterprets a drawing or diagram when wiring a house, devices could
be incorrectly installed or even missed altogether. Knowing how to properly take
information from an electrical drawing or diagram and apply it to the real world is
essential for electricians.

Block diagram: a diagram of a system in which the principal parts or functions are
represented by blocks connected by lines that show the relationships of the blocks.
Figure 1—Block diagram
Circuit drawing (diagram): a simplified conventional graphical
representation of an electrical circuit.
10'
SYMBOL LEGEND
21 mm Duplex receptacle
Single-pole switch
1 × 4 fluorescent
21 mm
light fixture
Electrical
panel
EMT run
Armoured cable
run (B/X)
12' 4x4 junction box

Figure 2—Circuit drawing
Line diagram: a one-line diagram or single-line diagram is a simplified
notation for representing an electrical system. The one-line diagram is similar
to a block diagram except that electrical elements such as switches, circuit
breakers, transformers, and capacitors are shown by standardized schematic
symbols.
Figure 3—One-line diagram
Pictorial diagram: a diagram that represents the elements of a system
using abstract, graphic drawings or realistic pictures.
Schematic diagram: a diagram that uses lines to represent the wires and
symbols to represent components. It is used to show how the circuit
functions.

Figure 4—Schematic diagram
Wiring diagram
A wiring diagram is a simplified conventional pictorial representation of an
electrical circuit. It shows the components of the circuit as simplified shapes, and
the power and signal connections between the devices.
A wiring diagram usually gives information about the relative position and
arrangement of devices and terminals on the devices, to help in building or
servicing the device. This is unlike a schematic diagram, where the arrangement of
the components' interconnections on the diagram usually does not correspond to
the components' physical locations in the finished device. A pictorial diagram would
show more detail of the physical appearance, whereas a wiring diagram uses a more
symbolic notation to emphasize interconnections over physical appearance.
A wiring diagram is often used to troubleshoot problems and to make sure that all
the connections have been made and that everything is present.
Wiring diagram (or pictorial): a simplified conventional pictorial representation of
an electrical circuit. It shows the components of the circuit as simplified shapes, and
how to make the connections between the devices. A wiring diagram usually gives
more information about the relative position and arrangement of devices and
terminals on
the devices

SELF CHECK 1.1-1
DEFINE THE FOLLOWING:
1. Block diagram
2. Line diagram
3. Pictorial diagram
4. Schematic diagram
5. Wiring diagram
ANSWER KEY 1.1-1

1. Block diagram: a diagram of a system in which the principal parts or functions
are represented by blocks connected by lines that show the relationships of the
blocks
2. Line diagram: a one-line diagram or single-line diagram is a simplified
notation for representing an electrical system.
3. Pictorial diagram a diagram that represents the elements of a system using
abstract, graphic drawings or realistic pictures
4. Schematic diagram: a diagram that uses lines to represent the wires and
symbols to represent components. It is used to show how the circuit functions.
5. Wiring diagram : a simplified conventional pictorial representation of an
electrical circuit. It shows the components of the circuit as simplified shapes,
and how to make the connections between the devices. A wiring diagram
usually gives more information about the relative position and arrangement of
devices and terminals on the devices
IDENTIFY PROPER USAGE AND TYPES OF CONDUITS, FITTINGS
IN ELECTRICAL INSTALLATION.
Conduits and Fittings
An electrical conduit is a pipe, tube, or other means in which electrical wires
are installed for protection from the elements or accidental damage. Much like

plumbing, the conduit's fittings depend upon the type of pipe or tubing used.
Navy construction generally uses rigid, thin-wall, or flexible conduit.
Rigid Conduit
Rigid galvanized steel or aluminum conduit is made in 10-ft lengths, in sizes
from 1/2 in. to 6 in. in diameter, threaded on both ends, with a coupling on
one end. Figure 10-21 shows rigid conduit and various fittings.
Figure 10-21 — Rigid conduit and fittings
An ordinary hacksaw or special wheel pipe
cutter is used for cutting, and a ratchet
type of mechanical die is used for
threading the cut ends.
Bending can be done manually, using a
bending tool commonly called a hickey
(Figure 10-22), or hydraulically. A
hydraulic bender is recommended for
making smooth and accurate bends.
Figure 10-22 — Conduit bender

(Hickey).
Condulets are a convenient way of making bends on sharp corners and
reducing the number of bends made in a run of conduit, especially in
conduit intended for exposure to the elements.
Another type of rigid conduit approved for use by NAVFAC is the polyvinyl
chloride (PVC) pipe. (Figure 10-23) Plastic conduit is especially suitable for
use in areas where corrosion of metal conduit is a problem.
PVC's advantages include
light handling weight, ease
of installation, and leak
proof joints.
Intended primarily for
underground wire and
cable raceway use, it is
available in two forms.
Type I is designed for
concrete encasement.
Type II is designed for
direct earth burial.
solvent-type adhesive welding process
joins rigid plastic conduit and fittings
together.
Figure 10-23 — Seabees installing PVC conduit.
PVC also comes in sizes of 1/2 to 6 in. in diameter with fittings available from the
manufacturer. (For more information on PVC fittings, refer to Article 370 of the NEC®.)
Thin-Wall Conduit
Electric metallic tubing (EMT) or thin-wall conduit is a conduit with a
wall thickness much less than that of rigid conduit. (Figure 10-24)
It is made in sizes from 1/2
to 2 in. in diameter.
Thin-wall conduit cannot
be threaded; therefore,
special types of fittings

are used for connecting
pipe to pipe and pipe to
boxes.
Figure 10-24 — Thin-wall conduit and fittings.
Flexible Conduit
Flexible conduit (called Greenfield) is a spirally wrapped metal band wound upon
itself and interlocking in such a manner as to provide a round cross section of high
mechanical strength and flexibility. (Figure 10-25)
Figure 10-25 — Flexible conduit and fittings.
It is used where rigid conduit would not be feasible. It requires no elbow fittings.
Greenfield is available in sizes from 1/2 to 3 in. in diameter and in two
types: the standard plain or unfinished-metal type and a moisture-
resistant type called sealtite, which has a plastic or latex jacket.
The moisture-resistant type is not intended for general use but only for
connecting motors or portable equipment in damp or wet locations where
connection flexibility is needed.
Wire Connectors
Figure 10-26 shows various types of connectors used to join or splice
conductors.
The type used will depend
on the type of installation
and the wire size.
Most connectors operate on
the same principle, that of

gripping or pressing the
conductors together.
Wire nuts are used
extensively for connecting
insulated single conductors
(both solid and stranded)
installed inside of buildings
Figure 10-26 — Typical cable and wire
connectors.
Outlet Boxes
An outlet box is simply a metal (or plastic) container, set flush or nearly flush
with the wall, floor, or ceiling, into which an outlet receptacle or switch will be
inserted and fastened. Outlet boxes used in Navy construction are usually made
of galvanized steel. However, along with the increase of other plastic materials in
construction, nonmetallic boxes made of rigid plastic compounds are being used
for approved installation.
Outlet boxes bind together the elements of a conduit or cable system in a
continuously grounded system. They also provide a means of holding conduit
in position, along with space and protection for mounted switches and
receptacles and working space for making splices and connections.
Boxes can be round, octagonal, square, or rectangular. Commonly used
outlet boxes are shown in Figure 10-27.
View A - a 4-in. octagon box used for
ceiling outlets. This box is made with
1/2-or 3/4-in. knockouts-
indentations that can be knocked out
to make holes for the admission of
conductors and connectors.
View B - a 4 11/16-in. square box
used for heavy duty, such as a range
or dryer receptacle. It is made with
knockouts up to 1 in. in diameter.
View C - a single receptacle gang box
used for switches or receptacles. Two
or more boxes can be ganged

(combined) to install more than one
switch or receptacle at a location.
View D - a utility box, called a handy
box, made with 1/2- or 3/4-in.
knockouts and used principally for
open-type work.
View E - a 4-in. square box with 1/2-
or 3/4-in. knockouts, used quite often for
switch or receptacle installation. It is
equipped with plastic rings having flanges of
various depths so that the box may be set in
plaster walls of various thicknesses
Typical outlet boxes.
Besides the boxes shown, special boxes called conduit gang boxes are
made to accommodate three, four, five, or six switches.
The NEC® requires outlet boxes be 1 1/2 in. deep except where the use of a
box that deep would result in injury to the building structure or is
impractical. In such cases, a box not less than 1/2 in. deep may be used.
For switch boxes, 2 1/2-in. in depth is the most widely used.
Also per NEC® requirements, outside edges of outlet and switch boxes
without flush plates cannot be recessed more than 1/4 in. below the
surface of the finished wall.
Receptacles
Receptacles are used to plug in lights and appliances around the building.
Figure 10-28 shows some of the most common receptacles.
Figure 10-28 — Common receptacles.

A convenience outlet (Figure 10-28, View A) is a duplex receptacle with two
vertical or T-slots and a round contact for the ground. This ground is
connected to the frame of the receptacle and is grounded to the box by way of
screws that secure the receptacle to the box.
A range receptacle (Figure 10-28, View B) may be either a surface type or a flush
type. It has two slanted contacts and one vertical contact and is rated at 50 A.
Receptacles for clothes dryers are similar but are rated at 30 A. Range and dryer
receptacles are rated at 250 V and are used with three-wire, 115/230 V, two hot
wires and a neutral.
An air conditioner receptacle taking 230 V (Figure 10-28, View C) is made
with two horizontal slots and one round contact for the ground.
Strip receptacles (Figure 10-28, View D) used in the Navy allow movement of
the receptacle to any desired location. These strips are available in 3-ft and 6-
ft lengths and may be used around the entire room. They are particularly
desirable with portable equipment or fixtures such as drafting tables and
audio-visual equipment. Exterior locations require special weatherproof
outlets to resist weather damage and minimize potential hazards from water
contacting the conductors.
Switches
For interior wiring, single-pole, three- or four-way toggle switches are used.
Most of the switches will be single-pole, but occasionally a three-way system is
installed, and on rare occasions, a four-way system.
single-pole switch is a one-blade, on-and-off switch that may be installed singly
or in multiples of two or more in a gang box.
In a three-way switch circuit there are two positions, either of which may be
used to turn a light ON or OFF.
The typical situation is one in which one switch is at the head of a stairway and
the other at the foot.
A four-way switch is an extension of a three-way circuit by the addition of a
four-way switch in the line between the two three-way switches. This allows
on/off switching from three locations.
Note that three- and four-way switches can be used as single-pole switches,
and four-way switches can be used as three-way switches. Some activities may
install all small-wattage, four-way switches for all lighting circuits to reduce
their inventories.
However, three- and four-way switches are usually larger than single-pole
switches and take up more box room. The size of a switch depends on its

ampacity (related maximum amperage capacity). The ampacity and maximum
allowable voltage are stamped on the switch.
TYPES OF ELECTRICAL CONDUITS
Galvanized Rigid Conduit or RMC
A conduit made from galvanized steel tubing is commonly referred as a rigid
conduit.
The thickness of a galvanized rigid conduit protects the electrical wiring from
being hit and allows it to be threaded. Galvanized rigid conduits are used by
electricians in commercial and industrial applications normally available in 10
feet and 20 feet lengths. This type of electrical conduit is used above grade and
has threads on both ends with a coupling on one end.
The installation of Rigid Steel Conduit (RSC) is covered by Article 344 of
the National Electrical Code® (NEC®). The rigid metallic conduit can be treated
to prevent corrosion by applying different coatings to the conduit. It is the
heaviest-weight and thickest wall conduit available in trade sizes ½ through 6
When to Use Electrical Metallic Tubing (EMT)?
Another example of a rigid electrical conduit is the EMT, also known as
Electrical Metallic Tubing. An EMT conduit is made of steel; in some cases,
aluminum is also used, cheaper than a galvanized rigid conduit and lighter
than a GR conduit.
EMT is also a very popular material in commercial and industrial buildings
because it can be bent to a specific radius and directions and it is thinner than
RMC. During recent years, EMT conduits have become popular in residential
construction as it provides an exterior corrosion resistance surface.
Electrical Non-Metallic Tubing Applications
Electrical nonmetallic tubing is another example of electrical conduit made of a
thin-walled corrugated tubing, moisture-resistant and flame retardant. The
non-metallic electrical conduit can be bent by hand and can be easily installed
due to its flexible properties. However, fitting used to connect non-metallic
tubing are rigid and cannot be bent. If you are looking for a faster installation
and lower labor cost, this is the one to consider.
Flexible Metallic Conduit or Liquid-tight Flexible Metal Electrical Conduit
(LFMC)
A flexible metallic conduit forms a hollow tube in which electrical wires are
passed. It is highly recommended in dry areas. The Flexible Metallic
Conduit also called greenfield of flex, does not maintain permanent bend and it
can be used where EMT is impractical to use.
However, a liquid-tight flexible metal conduit is covered by a plastic waterproof
coating. Its interior is very similar to the flexible metallic conduit. It is

recommended for use in general wiring, wet or damp locations. It can also be
used to direct burial; concrete embedded, and site lighting jobs
Liquid-tight Flexible Nonmetallic Conduit
Liquid-tight Flexible Nonmetallic Conduit (LNFC) is another term for a number
of flame resistant types of non-metallic tubing. This type of electrical conduit is
recommended as a raceway for the installation of approved conductors with a
nominal rating of 600 Volts or less for non-hazardous locations. The interiors of
this electrical conduit may be corrugated or smooth.
Aluminum Electrical Conduits
An aluminum conduit is a rigid conduit commonly used in commercial and
industrial applications. These types of electrical conduits are used to prevent
corrosion and are the preferred conduit used in areas where large amounts of
water and corrosion-prone areas. Aluminum cannot be directly embedded in
concrete since the metal reacts with the alkalis in cement however it might be
protected with additional coatings to prevent concrete from affecting the
conduit.
It is normally used in concrete slabs or walls.
The Most Common of All Electrical Conduits
PVC is the lightest conduit material and usually the most affordable type of
conduit. PVC pipes can vary in thickness depending on the uses and where the
PVC will be installed. The PVC conduit resists moisture and corrosion but the
tubing is non-conductive an extra grounding conductor must be passed into
each conduit. PVC conduit has a higher thermal coefficient of expansion
allowing the conduit to expand and contract. Be aware the installing PVC
underground in multiple or parallel run configurations, mutual heating might
cause problems on cable performance.
SELF CHECK 1.1-2
TEST I: ENUMERATE THE TYPES OF ELECTRICAL CONDUIT

ANSWER KEY 1.1-2
TEST I:
 Galvanized Rigid Conduit or RMC
 When to Use Electrical Metallic Tubing (EMT)?
 Electrical Non-Metallic Tubing Applications
 Flexible Metallic Conduit or Liquid-tight Flexible Metal Electrical Conduit
(LFMC)
 Liquid-tight Flexible Nonmetallic Conduit
 Aluminum Electrical Conduits
 The Most Common of All Electrical Conduits

IDENTIFY TECHNIQUE OF INSTALLATION AND BENDING OF CONDUIT
AND FITTING
Electrical Metallic Tubing
Electrical metallic tubing (EMT) is called thin-wall conduit. EMT is not
designed to be threaded; therefore, it is connected length-to-length or to
electrical boxes with suitable compression or setscrew fittings. When installed
correctly, EMT is used as an effective equipment grounding conductor. See
Figure 4-14
Electrical Metallic Tubing: Type EMT — Article 358
Locations Allowed Sizes Maximum Mounting Distance
Dry 1/2″ 3′
Wet
through

4″
1
0′
Setscrew fitting Compression fitting
(coupling) (coupling)
Connector Coupling
Locknut for the connector
Figure 4-14. These are various types of EMT fittings
Cutting conduit

The first step when cutting conduit is to secure it in a vise. This will help you
make straighter cuts and avoid broken blades. If a vise is not available, brace
the conduit against a secure surface such as a wall stud or a sawhorse. A
hacksaw is normally used to cut all types of conduit. A reciprocating saw
outfitted with a metal-cutting blade is also used to cut conduit. Either saw
should be fitted with a blade having 18 to 24 teeth per inch for a clean cut. See
Figure 4-15
Hacksaw Reciprocating saw
Figure 4-15. To cut EMT, secure it in a vise or hold it firmly and use a hacksaw, reciprocating
saw, or a pipe cutter
Tighten the pipe cutter Rotate the pipe cutter Repeat the first two steps
until it is snug. around the conduit. until the conduit breaks.
Figure 4-16. A pipe cutter can be used to cut conduit.
Reaming conduit
The ends of a length of conduit must be smooth to prevent any damage to the
wire’s insulation. After cutting the conduit, use a reamer, round file, or a
deburring tool to remove the burrs. See Figure 4-17.
Bending metallic conduit
The purpose of bending conduit is to route it around corners and over
obstructions. There are numerous special manufactured fittings avail-able that

could be used to achieve similar routing, but field bends are preferred. A field
bend is a bend that is made on the construction site. This generally saves time
and is far more economical than installing fittings.
Most bends in EMT are made with a conduit bender. Always use the correct
size bender for the conduit you are bending. This tool is designed to create a
bend with the proper bend radius. The NEC lists the minimum radius of
conduit bends in Chapter 9, Table 2.
Typical bends include stub (also known as stub-up), back-to-back, offset, and
saddle. The following sections will help you make these fundamental bends.
Bending conduit is an important skill you can master with practice
A pipe reamer mounted in a brace will quickly remove any burrs.
Insert the reamer into the conduit end and rotate the reamer.
Burrs may be removed with metal files. Use a flat file to remove any burrs on
the outside of the conduit. Slide a round file in and out at a slight angle while
rotating the conduit.
A deburring tool designed for EMT is available. Insert the
tool into the end of the conduit and rotate the tool. The
deburring tool will work on 1/2″, 3/4″, and 1″ trade size EMT.
Figure 4-17. The burr created by cutting must be removed, or it may damage the
insulation when pulling wires through the conduit.

Stub Bend
brings a horizontal run of conduit up or down to an outlet box. Practicing this
basic bend will help you become familiar with the conduit bender.
1. Measure the height of the total bend. This is typically from the bottom of
the horizontal conduit to the bottom of an electrical box.
2. Take this distance and subtract the radius of the conduit bender. The
resulting number is the distance to mark from the end of the conduit.
3. Place the conduit in the bender with this mark aligned to the bender’s
arrow.
4. Press down on the foot pedal of the bender (while guiding the handle to
keep the bend perpendicular to the floor) until the stub is 90°.
5. Use a torpedo level to confirm that the stub is vertical. See Figure 4-18.
Step 1 Step 2
Subtract 5″ from the total height Align the arrow of the bender
of the stub bend. This will be a with the mark on the conduit.
10″ stub.
Step 3 Step 4
Apply pressure on the Stop bending the conduit
bender with your foot when it reaches 90°.
Your hand should only
guide the direction of the bend.
Figure 4-18. Make a stub bend with a conduit bender and check it with a torpedo level.
Back-to-Back Bend
A back-to-back bend produces two 90° bends on a single length of conduit.
After the bends are made, both ends of the conduit are pointing in the same
direction.

1. Create the first bend by following the stub bend procedure.
2. Mark the distance from the outside of the first bend to the position where
the outside of the second bend should be.
3. Place the conduit into the bender so that the star point is aligned with
this mark.
4. Create the second bend.
5. Mark the conduit where the height of the second bend should be.
6. Cut the second bend at the mark. This is much more accurate than
trying to control the height prior to bending, as you would while making a
stub bend. See Figure 4-19
STEP 1
The distance between the outside of both
bends when completed will be 40″.
Measure this distance from the
outside of the first bend and mark
Step 2
Align the star of the bender with
the mark on the conduit
Step 3
Apply pressure on the
bender with your foot.
Your hand should only
guide the direction
of the bend.

Step 4
Stop bending the conduit
when it reaches 90°.
Step 5
Verify the distance from the
outside of both bends.
SELF CHECK 1.1-3
FILL IN THE BLANKS:
_______________1. The first step when cutting conduit is to secure it in a vise.
This will help you make straighter cuts and avoid broken blades. If a vise is not
available, brace the conduit against a secure surface such as a wall stud or a
sawhorse.
_______________2. The ends of a length of conduit must be smooth to prevent
any damage to the wire’s insulation. After cutting the conduit, use a reamer,
round file, or a deburring tool to remove the burrs
_______________3. The purpose of bending conduit is to route it around corners
and over obstructions. There are numerous special manufactured fittings avail-
able that could be used to achieve similar routing, but field bends are preferred.

_______________4. Is a bend that is made on the construction site. This generally
saves time and is far more economical than installing fittings
_______________5. Is a bend that is made on the construction site. This generally
saves time and is far more economical than installing fittings
ANSWER KEY 1.1-3
1. Cutting conduit
The first step when cutting conduit is to secure it in a vise. This will help you
make straighter cuts and avoid broken blades. If a vise is not available, brace
the conduit against a secure surface such as a wall stud or a sawhorse.
2. Reaming conduit
The ends of a length of conduit must be smooth to prevent any damage to the
wire’s insulation. After cutting the conduit, use a reamer, round file, or a
deburring tool to remove the burrs
3. Bending metallic conduit
The purpose of bending conduit is to route it around corners and over
obstructions. There are numerous special manufactured fittings avail-able that
could be used to achieve similar routing, but field bends are preferred.
4. A field bend is a bend that is made on the construction site. This generally
saves time and is far more economical than installing fittings.

5. Electrical metallic tubing (EMT) is called thin-wall conduit. EMT is not
designed to be threaded; therefore, it is connected length-to-length or to
electrical boxes with suitable compression or setscrew fittings
APPLY PROPER USAGE OF SAFETY HARNESS
Workers must be able to:
 Identify potential fall hazards
 Determine which products to use in specific work environments
 Demonstrate proper anchoring procedures
 Inspect and maintain fall protection equipment
 Demonstrate procedures and the proper wearing of fall protection
equipment
The following is a suggested list of training objectives:
 Recognize fall hazards and eliminate the hazard where possible.
 Know the three parts of a fall arrest system: Anchorage, Body Support,
and Connection.
 Select the proper equipment for each application.
 Consider environmental and other workplace factors.
 Avoid incompatible connections to prevent snap hook roll-out and/or
burst-out. Determine and reduce free fall distances.
 Understand how to lower the maximum arresting force.
 Properly fit a harness.
 Select an appropriate anchor point.
 Implement a pre-determined rescue plan.
 Inspect and maintain equipment.

 Understand the limitations and requirements of the equipment.
 Understand the consequences of not following,
 or understanding manufacturer’s instructions

Competent person is defined as “…one who is capable of identifying
existing and predictable hazards in the surroundings or working
conditions which are unsanitary, hazardous, or dangerous to employees,
and who has authorization to take prompt corrective measures to
eliminate them.”
Qualified person is defined as “…one who, by possession of a recognized
degree, certificate, or professional standing, or who by extensive
knowledge, training and experience, has successfully demonstrated
his/her ability to solve or resolve problems related to the subject matter,
the work, or the project.”
To cover variations in the definitions of a competent person in the field of
safety at heights, the person in this important role should meet these
minimum qualifications:
 Be able to identify existing or predictable hazardous or dangerous
conditions related to the workplace, work processes and the safety at
heights program.
 Be able to establish controls on identified existing or predictable fall
hazards according to the hierarchy of controls.
 Understand how to select, inspect, use, store and maintain personal
equipment for fall protection.
 Be able to identify existing or predictable hazardous or dangerous
conditions in a personal fall arrest system, and any component thereof.
 Have the authority of take prompt corrective measures to control existing
or predictable fall hazards and unsafe fall protection equipment
conditions.
 Be able to train workers at risk of falling from heights in accordance with
standards and regulation.
 Apply a working knowledge of applicable standards and regulations.
COMPONENTS OF A PERSONAL FALL ARREST SYSTEM
There are three vital components that make up a
complete fall protection system.
These are the ABC’s of fall protection:
Anchorage.

Body support.
Means of Connection.
Each one must be in place and properly used to
provide maximum worker protection.
While each of these components is vital to
worker safety, the connecting device is the
critical link in assembling a safe fall protection
system since it bears the greatest force during
a fall. Careful consideration must be given to
the selection, materials, construction and
inspection/maintenance of fall Protection
equipment before, during and after a
connecting device has been selected.
ANCHORAGE
Defines anchorage as a fixed structural component such as a beam, girder,
column or floor that can support the forces exerted in arresting a fall and
introduces the term “anchorage connector” to refer to the component by which
the connecting device is coupled to the anchorage. It may be a beam anchor,
cross-arm strap, D-bolt, hook anchor, tripod, davit or other secure device that
serves as a point of attachment for lifelines, lanyards or deceleration devices.
Anchorages and anchorage connectors must be independent and capable of
supporting 5,000 lb per employee attached, or designed, installed and used
under the supervision of a qualified person as part of a complete personal fall
arrest system which maintains a safety factor of at least two. They must also be
located high enough for a worker to avoid contact with a lower level should a
fall occur.
BODY SUPPORT
Body support, or body wear, is the component that is worn on or around the
torso. Body belts and full body harnesses are the two most common body
supports.
Body Belt
A body belt is a belt that circles the waist and is used for worker positioning
and fall prevention. A body belt may be supplied with D-rings on the hips
and/or middle of the back. A body belt must NEVER be used for personal fall
arrest.
Full Body Harness
A full body harness is a body support device that
distributes fall arrest forces across the shoulders, thighs
and pelvis. Full body harnesses have a center back fall
arrest attachment for connection to the fall arrest

connecting device and may have other D-rings for use in
worker positioning, fall prevention, suspension or ladder
climbing.
 The only form of body wear acceptable for fall arrest is
the full -body harness.
 Full body harnesses should be selected based on
work to be performed and the work environment.
 Front D-rings on full body harnesses are used only for
ladder-type fall arrestors, work positioning, travel
restraint or rescue. Side D-rings are for positioning
only.
MEANS OF CONNECTION
The connecting subsystem is the critical link which joins the body wear to the
anchorage/ anchorage connector. It can be an energy-
absorbing lanyard, fall limiter, self-retracting lan-yard,
rope grab, or retrieval system. Connecting means will
vary depending on whether the worker is equipped for
personal fall arrest or work positioning and travel
restriction.
Connecting Means for Personal Fall Arrest
The connecting means for personal fall arrest is often a
lanyard equipped with an energy-absorbing element to
reduce the energy transmitted to the user’s body in the
event of a fall. Self-retracting lifelines or fall limiters
reduce free-fall distance as well as reducing energy loads
from a fall. Go to section 5.3 for guidance on calculating
fall clearance.
Connecting Means for Positioning and Travel Restriction
The connecting means for positioning and travel
restriction is often a simple lanyard, constructed of rope,
web or wire rope. These may also include specialized
positioning assemblies for rebar work, constructed of
chain or web. All positioning devices are intended to
reduce the potential for free fall to a distance of less than
two feet. Restraint lanyards are specified in length to
prevent the user from reaching a fall hazard zone.

SELF CHECK 1.1-4
IDENTIFY: The three vital components that make up a
complete fall protection system. These are the ABC’s of fall protection:
ANSWER KEY 1.1-4
There are three vital components that make up a

complete fall protection system.
These are the ABC’s of fall protection:
Anchorage.
Body support.
Means of Connection.
LO2. Install electrical protective devices
1. Safety procedures are followed in line with job requirements
2. Correct procedures for installation of electrical protective devices are
performed in line with job requirements and PEC
3. Schedule of work is followed to ensure work is completed in an agreed
time, to a quality standard and with a minimum waste
4. Further instructions are sought from a supervisor if unplanned events or
conditions occur

5. On-going checks of quality of work are done in accordance with
instructions and requirements
CONTENT:
 Determine suitability for installation and used of bus way, cable tray,
fittings and panels, conformity with the provision of the PEC Code.
 Practice wire way and cable tray installation
CONDITIONS:
 Workplace location
 Materials relevant to the unit of competency
 Materials and tools
 Masonry
 Materials and tools different brand names, size, capacity and kind of
application.
 Handouts/Instructional Materials
METHODOLOGIES:
 Lecture - demonstration
 Self-paced instruction
 Group discussion
 PowerPoint presentation
ASSESSMENT METHODS:
 Direct observation
 Questions or interview
 Written test
 Portfolio (credentials)
DETERMINE SUITABILITY FOR INSTALLATION AND USED OF BUS WAY,
CABLE TRAY, FITTINGS AND PANELS, CONFORMITY WITH THE
PROVISION OF THE PEC CODE
CABLE TRAY
According to the National Electrical Code, a cable tray system is "a unit or
assembly of units or sections and associated fittings forming a rigid structural
system used to securely fasten or support cables and raceways."
Cable tray advantages include wiring system design flexibility, simplicity, and
lower installation cost. In plants where equipment is added, taken away, or is
moved, cable trays provide a flexible advantage (Fig. 2). Cable trays can
typically adapt to complex configurations with a simple set of tools. The cost of
material procurement for cable tray systems is not necessarily lower than that

of conduit systems in all cases. However, compared to labor cost of conduit
installation, cable trays present significant savings.
There are six basic cable tray types:
 Ladder — provides solid side rail protection, system strength, smooth
radius fittings, and a wide selection of materials and finishes. Ladder
cable tray is generally used in applications with intermediate to long
support spans
 Solid bottom — provides nonventilated continuous support for delicate
cables with added cable protection available in metallic and fiberglass.
Also available are solid bottom metallic trays with solid metal covers for
nonplenum rated cable in environmental air areas. Solid Bottom cable
tray is generally used for minimal heat-generating electrical or
telecommunication applications with short to intermediate support
spans.
 Trough — provides moderate
ventilation and added cable
support frequency, with the
bottom configuration providing
cable support every 4 in.
Available in metal and
nonmetallic materials, through
cable tray is generally used for
moderate heat generating
applications with short to
intermediate support spans.
 Channel — provides an
economical support for cable
drops and branch cable runs
from the backbone cable tray
system. Channel cable tray is
used for installations with limited
numbers of tray cable when
conduit is undesirable.
 Wire mesh — provides job site or field-adaptable support systems
primarily for low-voltage wiring. Wire mesh tray generally is used for
telecommunication and fiber optic applications. Wire mesh tray systems
are typically zinc plated steel wire mesh.

 Single rail — provides the quickest system installation and the most
freedom for cables to enter and exit the tray system. Typically, single-rail
cable tray is used for low-voltage and power cable installations where
maximum cable freedom, side fill, and installation speed are factors.
These aluminum systems may be single-hung or wall-mounted systems
in single or multiple tiers.
Cable tray configurations
Straight sections are available to route cables in a horizontal or vertical
plane. Fittings route cables in various directions in either the horizontal
or vertical planes. Typical fittings include elbows, tees, crosses, and
risers. These fittings are available in various radii and bend angles.
Support methods include trapeze (single or multitier), hanger rod clamps,
"J" hangers, center hung support, wall support, underfloor support, and
pipe stanchions. Trapeze supports are recommended in applications
where cables will be pulled through the cable tray. Center-hung supports
typically are used when cables will be installed from the side of the cable
tray. Also, center-hung supports are especially useful when future cable
additions are necessary.
Wall and underfloor supports are useful when ceiling structure is not
available or undesired. Outdoor installations are controlled by the
structures available to support the cable tray.
Conduit
The primary benefit of conduit systems is the ability to ground and bond.
Grounding and bonding play a significant role in minimizing
electromagnetic interference (EMI). Steel conduit reduces electromagnetic
fields by up to 95%, effectively shielding computers and sensitive
electronic equipment from the electromagnetic interference (EMI) caused
by power distribution systems.
Benefits of conduit include:
o Competitive life-cycle costs
o EMI shielding
o Physical protection of conductor
o Proven equipment grounding conductor
o Chemically compatible with concrete
o Coefficient of expansion compatible with common building
materials
o Noncombustible
o Recyclable

o High tensile strength.
There are two primary reasons to use steel conduit. According to the Steel Tube
Institute of North America, steel conduit is the best possible protection of your
electrical conductor and wiring systems, and it facilitates the insertion and
extraction of conductors and wiring. Steel conduit is used in more than 50% of
U.S. manufacturing and other industrial facilities in a variety of indoor,
outdoor, and underground applications, including those where corrosive and
hazardous conditions exist.
The three basic types of steel conduit and their applications are:
Rigid metal conduit (RMC) has the thickest wall, making it the heaviest steel
conduit. Inside and outside are zinc-coated to provide corrosion resistance.
RMC can be used indoors, outdoors, underground, and in concealed or exposed
applications
Intermediate metal conduit (IMC) has a thinner wall and weighs less than
RMC. A zinc-based coating is used on the outside; an organic corrosion-
resistant coating is used on the inside. IMC can be used for the same
applications as galvanized rigid metal conduit
Electrical metallic tubing (EMT) is the lightest weight steel conduit
manufactured. EMT is made of galvanized steel and is unthreaded. It is joined
by setscrew, indentation, or compression-type connectors and couplings. This
joining method makes EMT easy to alter, reuse, or redirect. Even though EMT
is made of lighter-walled steel, it provides substantial physical protection and
can be used in most exposed locations except where severe physical damage is
possible.
RMC, IMC, and EMT are permitted as an equipment grounding conductor in
accordance with NEC 250.118. A supplementary equipment grounding
conductor sized in accordance with NEC 250.122 may be added as well. If a
supplementary equipment grounding conductor is used, it is still important to
comply with NEC 300.10 and 300.12, since approximately 90-95% of the
ground current flows on the conduit and not in a supplementary conductor.
Environmental considerations for conduit
The coefficient of expansion for steel conduit/EMT is 6.5x10-6in./in./deg F.
This is significant as it relates to whether or not expansion fittings would be
required in a particular application. Expansion fittings are installed where
significant temperature differentials are anticipated. These temperature shifts
cause materials to expand and contract and could result in the conduit being
pulled apart at the joints. Expansion fittings are not normally required with
steel conduit/tubing because their coefficient of expansion is similar to that of
other common building materials. However, when steel conduit is installed on
bridges, rooftops, or as an outdoor raceway span between buildings, expansion

fittings may be required. In these
types of installations, there is a
probability that expansion and
contraction would occur,
resulting from the direct heat of
the sun coupled with significant
temperature drops at night.
Couplings that accommodate
thermal expansion while
maintaining grounding and
bonding integrity are now
available. Such a coupling uses
an internal bonding jumper to
maintain electrical continuity (Fig. 3). An internal, keyed, sliding bushing
allows conduit movement. Installation is simple, requiring no disassembly.
These couplings are installed by sliding the fitting onto the moving conduit
until it stops at the internal slide bushing, then tightening. The next step is to
tighten the gland nut with a wrench to compress the packing, creating a
weather-resistant seal around the moving conduit. The final step is to thread
the next length of conduit (stationary) into the other end of the fitting.
PLANT ENGINEERING magazine extends its appreciation to Cablofil, Inc.,
Cable Tray Institute, Square D/Schneider Electric, Steel Tube Institute of
North America, and Thomas & Betts Corp. for the use of their materials in the
preparation of this article.
Cable tray selection checklist
When selecting cable trays, cable tray configurations, and support methods,
seek the answers to the following questions:
Where will the cable trays be used?
Job site and installation considerations include:
Indoor
Support locations available affect the length and strength of the system.
Industrial installations may require a 200 lb concentrated load.
Office installation may make system appearance, system weight, and space
available important factors.
Environmental air handling areas may affect cable types, cable tray material, or
cable tray type, as well as the potential need for covers.

Classified hazardous locations affect the acceptable cable types.
Outdoor
Available supports affect length and strength requirements.
Environmental requirements include loads, ice, wind, snow, and possibly
seismic situations.
Corrosion requirements affect materials and finishes.
Classified hazardous locations affect acceptable cable types.
What types of cables will be supported, and how many?
NEC cable fill requirements dictate size, width, and depth of cable tray.
Cable support requirement may necessitate bottom type.
Largest bending radius of cable controls fitting radius.
Total cable weight determines load to support.
What are the future requirements of your system?
Cable entry/exit freedom may change.
Designing a partially full or an expandable system may produce big savings
later
Support type should allow for expansion needs.
Conduit installation tip
• Conduit having factory-cut threads are supplied with corrosion protection
applied.
• Field cut threads are required to be coated "with an approved electrically
conductive, corrosion-resistant compound where corrosion protection is
necessary," according to NEC 2002 300.6 (A). Field-cut threads should be
protected from corrosion if they will be installed in wet or outdoor locations.
Protect the thread surface with conductive rust resistant coating such as zinc-
rich paint. Other conductive coatings are appropriate as well.
• Field threads should be cut one thread short. This ensures a good connection
and allows the entire thread surface to be inside the coupling.

SELF CHECK 1.2-1:
DEFINE THE 6 TYPES OF SIX BASIC CABLE TRAY TYPES
ANSWER KEY 1.2-1:

There are six basic cable tray types:
 Ladder — provides solid side rail protection, system strength, smooth
radius fittings, and a wide selection of materials and finishes. Ladder
cable tray is generally used in applications with intermediate to long
support spans
 Solid bottom — provides nonventilated continuous support for delicate
cables with added cable protection available in metallic and fiberglass.
Also available are solid bottom metallic trays with solid metal covers for
nonplenum rated cable in environmental air areas. Solid Bottom cable
tray is generally used for minimal heat-generating electrical or
telecommunication applications with short to intermediate support
spans.
 Trough — provides moderate ventilation and added cable support
frequency, with the bottom configuration providing cable support every 4
in. Available in metal and nonmetallic materials, through cable tray is
generally used for moderate heat generating applications with short to
intermediate support spans.
 Channel — provides an economical support for cable drops and branch
cable runs from the backbone cable tray system. Channel cable tray is
used for installations with limited numbers of tray cable when conduit is
undesirable.
 Wire mesh — provides job site or field-adaptable support systems
primarily for low-voltage wiring. Wire mesh tray generally is used for
telecommunication and fiber optic applications. Wire mesh tray systems
are typically zinc plated steel wire mesh.
 Single rail — provides the quickest system installation and the most
freedom for cables to enter and exit the tray system. Typically, single-rail
cable tray is used for low-voltage and power cable installations where
maximum cable freedom, side fill, and installation speed are factors.
These aluminum systems may be single-hung or wall-mounted systems
in single or multiple tiers.
PRACTICE WIRE WAY AND CABLE TRAY INSTALLATION
Figure 4-4. Simple sketch of a wiring system. It is the part of the circuit that carries current from
the source through the boxes to a load

Wiring Systems
Conductors for carrying electricity are commonly called wiring. A wiring
system includes the wire, its insulating cover, a protective cover, and connectors
that fasten it to an electrical box.
Depending on the structure being wired, several different systems may be used.
Regardless of the wiring system, it is important to have a continuous ground
throughout every part of the system and every circuit. Refer to Chapter 9,
Grounding of this text for grounding requirements. All of these systems are
adequate for most installations. Some cannot be used where there are unusual
hazards such as extreme moisture, explosive gases, or corrosive chemicals.
The wiring system selected depends on:
 Type of dwelling (style)
 Materials and type of construction used (such as log, concrete, post and
beam, or platform)
 Surroundings of dwelling (hot, cold, wet, or dry)
 Cost of the electrical materials
 Contractor’s preference
 Building code requirements
 Preference of owner (client)
Cables

A cable is an arrangement of two or more conductors in a protective covering
and is assembled by the manufacturer. The protective covering may be plastic,
rubber, steel, or aluminum.
Armored Cable
Armored cable (AC) is a manufactured assembly of insulated conductors in a
flexible interlocked metallic armor, Figure 4-5. AC is frequently called BX, a
trade name for armored cable produced at the Sprague Electric division of
General Electric.
The conductors in AC may be copper, aluminum, or copper clad aluminum. The
outer covering is called armor and is made of steel or aluminum. As always, see
the manufacturer’s instructions before installing. One of the conductors in the
cable is an uninsulated conductor that is in continuous contact with the armor.
This wire is called a bonding strip.
The use of AC is generally limited to dry locations where it is not subject to
physical damage. Thus, it may be used in masonry block, tile walls, attics, and
wall spaces, as well as along studs, rafters, and joists. Also, care must be taken
to maintain a bend radius of the AC that is five times its diameter
Armored cable is expressly forbidden for use in
 Commercial garages.
 Hoistways, elevators, or cranes.
 Theaters or motion picture studios

Cable Cutter Hacksaw Reciprocating Saw
Figure 4-6. A hacksaw, reciprocating saw, or special cable cutter will cut AC
Stripping armored cable
There are several methods for cutting through the metal armor and stripping
the cable end. Regardless of the method used, always be careful to not damage
the wires inside the armor.
•
Hacksaw. The most
common tool for cutting
the armor is the
hacksaw. The hacksaw
blade is placed on the
armor so that it makes a
diagonal cut across
one of the high ridges.
See Figure 4-7. Once
the armor is through,
it can be twisted off the
inside wires
Figure 4-7. A hacksaw can be used to notch AC for stripping the armor.

 Aviation or tin snips. The first step is to bend the cable sharply where the
armor will be cut. This will cause the interlocked armor to disengage.
Twist the armor to force it to expand and expose one twist in the armor.
Place one jaw of the snips under this exposed section and cut the armor.
Remove the armor and trim any sharp corners. See Figure 4-8.
• Roto-Split. The specific directions will come with the tool when you
purchase it, but here are the basic steps. First, place the cable into the channel
of the tool. Squeeze the handle to hold the cable in place. Turn the crank until
the pressure decreases. Remove the cable from the tool and rotate the armor
until it breaks free. See Figure 4-9.
After you have stripped the armor from the cable, you must install an anti-
short bushing. This red, split, plastic sleeve is placed between the wires and the
rough edge of the armor. Make sure to place the split of the bushing
opposite the armor end for maximum protection. See Figure 4-10. This bushing
keeps the insulation from rubbing against the sharp edge of the armor. The
bushing must be in place to pass an electrical inspection. Purchase plenty of
bushings when buying armored cable.
When the anti-short bushing is in place, bend the bonding strip back over the
bushing and wrap the cable as shown. Add the connector and tighten the
setscrew or the clamp. The setscrew type of connector cannot be used on
aluminum AC. See Figure 4-11

Bend the cable Twist against Cut the armor and
sharply to buckle it. the direction trim off sharp edges.
of the spiral.
Figure 4-9. A Roto-Split® is a tool that slices the armor so that it can be
twisted off the cable. (Seatek Co. Inc.)
Figure 4-10. Always install
an anti-short bushing
to protect the wires. The tab
on the bushing helps
the inspector see that it is
installed
Figure 4-11. The setscrew connector cannot be used on aluminum AC. The clamping connector can be used on steel
or aluminum AC. Always read the cable manufacturer’s installation instructions for any restrictions
Nonmetallic Sheathed Cable
Nonmetallic sheathed cable (NM) has two or more insulated conductors
wrapped in a strong plastic or braided outer sheath. Often included is a bare
copper ground wire, Figure 4-12. NM is the easiest and, in many areas, the
most popular system to install. NM is easily cut to length with cable cutters. A
cable ripper is used to split the outer jacket from the point where the wires will
be exposed to the end of the cable. Place the cutting tooth in the center of the
cable about 8” from the end. Squeeze the ripper closed to pierce
Nonmetallic Sheathed Cable: Types NM, NMC, and NMS — Article 334

Grounded
Grounding
Jacket
Ungrounded
Ungrounded
Locations Allowed Sizes Maximum Mounting Distance
Type NM: Normally Dry 14 AWG 12″
Type NMC: Moist, damp, or corrosive through
Type NMS: Normally Dry 2 AWG
4 1/2′
Figure 4-12. This is typical nonmetallic sheathed cable with two current-carrying conductors,
a grounded conductor, and a grounding conductor.

Measure 8″. Place the cable ripper over
the cable and press the
cutter into the jacket
Slide the ripper to the end Use a
knife to cut the
of the cable. You should
jacket off the cable.
be able to peel the jacket Always
cut away from
off as shown. your
body
Figure 4-13. Strip off about 8″ of outer covering from NM cable with a special knife or a cable ripper as shown
Code Alert
At least 6″ of free conductor, measured from the point in the box where it
emerges from its raceway or cable sheath, shall be left at each outlet, junction,
and switch point for splices or the connection of luminaires (fixtures) or devices.
Where the opening to an outlet, junction, or switch point is less than 8″ in any
dimension, each conductor shall be long enough to extend at least 3″ outside
Service-Entrance Cable
Service-entrance cable (SE) may be a single conductor or a multiconductor
assembly with or without an overall covering. It is used to bring electricity into
a customer’s building from an overhead utility pole. Underground
Stripping the insulation off the conductor is done with an electrician’s knife.
Cut into the insulation around the circumference of the cable, without nicking
the conductor. Cut the insulation lengthwise from the first cut to the end of the
cable. Now, peel off the insulation.
Since the conductors in these cables must be large enough to handle the power
requirements of an entire building, they may be stiff and difficult to work into
position. A cable bender is handy to create small-radius bends in the heavy
cable
Underground Feeder and Branch-Circuit Cable

Underground feeder and branch-circuit cable (UF) is a nonmetallic sheathed
cable that is run underground between the service equipment and the final
branch circuit overcurrent device. A typical installation would be a branch from
the main service panel to a detached garage. Although the materials in UF are
designed for underground use, the cutting and stripping procedure is exactly
the same as standard NM cable. As with all underground cables and conduit,
review the local codes for proper burial depth.
Raceways
Raceways are protective coverings installed on site and used to contain wires.
Raceway materials are selected depending on the intended application. Wire
size and ampacity, environment, installation conditions (new or remodel),
building codes, and cost are all factors that will determine the selection of a
raceway. Raceways consist of conduit, boxes, and fittings. Conduit is the tubing
connecting the boxes together. The wires are pulled from box to box through
the conduit. Boxes can be used for either junctions to connect the wires or
mounting devices such as lamp fixtures
SELF CHECK 1.2-2
TEST I: The wiring system selected depends on:
TEST II: FILL THE BLANKS
1. ________ are protective coverings installed on site and used to contain
wires. Raceway materials are selected depending on the intended
application.
2. _________ is a nonmetallic sheathed cable that is run underground
between the service equipment and the final branch circuit overcurrent
device.
3. __________ may be a single conductor or a multiconductor assembly with
or without an overall covering.

4. __________ has two or more insulated conductors wrapped in a strong
plastic or braided outer sheath. Often included is a bare copper ground
wire,
5. __________ There are several methods for cutting through the metal armor
and stripping the cable end. Regardless of the method used, always be
careful to not damage the wires inside the armor.
6. A _________is an arrangement of two or more conductors in a protective
covering and is assembled by the manufacturer. The protective covering
may be plastic, rubber, steel, or aluminum.
7. __________ is a manufactured assembly of insulated conductors in a
flexible interlocked metallic armor, Figure 4-5. AC is frequently called BX,
a trade name for armored cable produced at the Sprague Electric division
of General Electric.
ANSWER KEY 1.2-2
TEST I: The wiring system selected depends on:
 Type of dwelling (style)
 Materials and type of construction used (such as log, concrete, post and
beam, or platform)
 Surroundings of dwelling (hot, cold, wet, or dry)
 Cost of the electrical materials
 Contractor’s preference
 Building code requirements
 Preference of owner (client
TEST II: FILL THE BLANKS
1. Raceways are protective coverings installed on site and used to contain
wires. Raceway materials are selected depending on the intended
application.

2. Underground feeder and branch-circuit cable (UF) is a nonmetallic
sheathed cable that is run underground between the service equipment
and the final branch circuit overcurrent device.
3. Service-entrance cable (SE) may be a single conductor or a
multiconductor assembly with or without an overall covering.
4. Nonmetallic sheathed cable (NM) has two or more insulated conductors
wrapped in a strong plastic or braided outer sheath. Often included is a
bare copper ground wire,
5. Stripping armored cable There are several methods for cutting through
the metal armor and stripping the cable end. Regardless of the method
used, always be careful to not damage the wires inside the armor.
6. A cable is an arrangement of two or more conductors in a protective
covering and is assembled by the manufacturer. The protective covering
may be plastic, rubber, steel, or aluminum.
7. Armored cable (AC) is a manufactured assembly of insulated conductors
in a flexible interlocked metallic armor, Figure 4-5. AC is frequently called
BX, a trade name for armored cable produced at the Sprague Electric
division of General Electric.
PERFORMANCE CRITERIA CHECKLIST 1.2.2
The trainee/candidate must perform the task given in this performance criteria
checklist prior to proceed on the next core competency in this curriculum.
Instruction
Given the equipment tools and materials instruct the trainee/candidate to show
competency in Strip off about 8″ of outer covering from NM cable with a
special knife or a cable ripper perform all the procedures in 30 minutes
including the mis-en-place. (Strip off about 8″ of outer covering from NM cable
will depend on trainer)
Strip off about 8″ of outer covering from NM cable with a special knife or
a cable ripper
TASK/ACTIVITY YES NO
1. Prepare all the materials, supplies, tools and
equipment accordingly.
2. Performed the mis-en-place.
3. Measure 8″
4. Place the cable ripper over the cable and press the
be able to peel the jacket

5. Slide the ripper to the end of the cable. You should
6. Use a knife to cut the jacket off the cable. Always
cut away from your body
7. Follow in order all the procedure of the given Strip
off methods
8. Wear proper PPE
9. Observe the OHS during the preparation of Strip off
methods
10.Finished in time frame given all the given of Strip
off methods
OVER-ALL RESULT
COMPETENT
NOT YET COMPETENT
CORE COMPETENCIES:
Units of Competency Module Title Code
1. Perform roughing-in, wiring and
cabling works for single-phase
distribution, power, lighting and
auxiliary systems
1.1 Performing roughing-in, wiring and cabling
works for single-phase distribution, power, lighting
and auxiliary systems
ELC741301
2. Install electrical protective devices
for distribution, power, lighting,
auxiliary, lightning protection and
grounding systems
2.1 Installing electrical protective devices for
distribution, power, lighting, auxiliary,
lightning protection and grounding systems
ELC741302
3. Install wiring devices of floor and
wall mounted outlets, lighting
fixtures/switches and auxiliary
outlets
3.1 Installing wiring devices of floor and wall
mounted outlets, lighting fixtures/switches
and auxiliary outlets
ELC741303
MODULE CONTENT
UNIT OF COMPETENCY : INSTALL ELECTRICAL PROTECTIVE DEVICES
FOR DISTRIBUTION, POWER, LIGHTING,
AUXILIARY, LIGHTNING PROTECTION AND
GROUNDING SYSTEMS
MODULE TITLE : INSTALLING ELECTRICAL PROTECTIVE
DEVICES FOR DISTRIBUTION, POWER,
LIGHTING, AUXILIARY, LIGHTNING
PROTECTION AND GROUNDING SYSTEMS

MODULE DESCRIPTOR : This unit covers the knowledge, skills and
attitudes on planning and preparing work,
installing electrical protective devices, lightning
fixture and auxiliary outlet and notifying
completion of work for distribution, power,
lighting, auxiliary, lightning protection and
grounding systems
NOMINAL DURATION : 60 hours
QUALIFICATION LEVEL : NC II
SUMMARY OF LEARNING OUTCOMES:
At the completion of this module the trainees/student must be able to:
LO1. Plan and prepare work
LO2. Install electrical protective devices
LO3. Install lighting fixture and auxiliary outlet.
LO4. Notify completion of work
LO1. PLAN AND PREPARE WORK
1. Instructions for the preparation of the work activity are
communicated and confirmed to ensure clear understanding
2. Tools, equipment and PPE needed to install electrical wiring are
identified, checked to ensure they work correctly as intended
and are safe to use in accordance with established procedures
3. Materials needed for work are obtained in accordance with
established procedures.
CONTENT:
 Types of protective devices and its applications/ applications
 Identification of standard drawing based on standard (ANSI or
IEC)
 Protective devices specifications
 Electrical protection system components requirements
CONDITIONS:
 Masonry
application.

METHODOLOGIES:
ASSESSMENT METHODS:
 Written test
PLAN AND PREPARE WORK
Types of protective devices and its applications/ applications
Electrical Protective Device – Types of Protective Device
Electrical Protective Device
A device used to protect equipment, machinery, components and devices, I n
electrical and electronic circuit, against short circuit, over current and earth
fault, is called as protective devices.
Necessity of Protective Devices
Protective devices are necessary to protect electrical appliance or equipment
against
a) Short Circuit
b) Abnormal variations in the supply voltage
c) Overloading of equipment
d) To protect operator against accidental contact with the faulty equipment,
falling which the operator may get a severe shock.
Types of Protective Device
Different types of the protective device that are commonly used in electrical and
electronic circuit
1.Fuse Wire or Fuse
2.MCB – Miniature circuit breaker

3.ELCB – Earth Leakage Circuit Breaker
4.ELCB & MCB
5.Earthing or Grounding
1.Fuse
Fuse generally means a fuse wire,placed in a
fuse holder.It is a safety device,which protects electrical and electronic circuit
against over loads,short circuit and earth faults.
The fuse link or fuse wire is made of low resistivity material and low melting
point.
Operation of a Fuse –
Fuse is a short length of wire designated to melt and separate in case of
excessive current.
The fuse is connected in the phase of the supply.
It is always connected in series with the circuit / components that need to be
protected.
When the current drawn by the circuit exceeds the rated current of the fuse
wire, the fuse wire melts and breaks. This disconnects the supply from the
circuit and thus protects the circuit and the components in the circuit.
Rating of Fuse Wire –
The maximum current that a fuse can carry, without being burnt, is called the
rating of the fuse wire. It is expressed in Amperes.
Current rating of the fuse, selected for the circuit, should be equal to the
maximum current rating of the machinery, appliance or components connected
in the circuit.
Fuse Carrier and Fuse Channel –
Fuse carrier and channel are made of porcelain or Bakelite material. They are
used for all domestic, commercial and industrial application up to 100 A
capacity.
Cartridge Fuse

This fuse unit is in the form of a cartridge.
Its normally manufactured in the range of 2 A to 100 A.
Whenever the fuse blows off, fuse with carrier is replaced by a new one.
As it is sealed, it cannot be rewired.
Cartridge fuses are used to protect motors and branch circuit where higher
amps or volt ratings are required. They are available in wide variety of sizes,
amp and volt ratings up to 600 Vac and 600 amps.
Cartridge fuses are used extensively in commercial, Industrial and agricultural
applications as well as residential fuse panels, air conditioning, pumps,
appliances and other equipment.
Cartridge Fuses are available in two types-
General purpose fuses have no time delay and protect fuse panel, appliances
and branch circuits
Heavy duty fuses have a time delay feature
HRC Fuse
HRC Fuse
HRC Fuse – High Rupture Capacity fuse unit.It is normally designed for high
current.When fuse is blown off,the entire unit
is to be replaced by a new one.It cannot be
rewired as it is a sealed one.
Characteristics of a good fuse wire
A good fuse wire should possess the following
characteristics
a)Low resistivity
b)Low melting point
C)Low conductivity of the metal vapors formed, when the fuse is blown off.

Advantages of HRC Fuse
1.They require maintenance
2.They are reliable
3.They operate at high speed.
4.They have consistent performance
5.They clear both low
and high fault current
with equal efficiency.
2.MINIATURE
CIRCUIT BREAKER
It is safety device
which work magneto
thermic release principle. It is connected in the phase, between the supply and
load. It is manufactured in standard rating of 6A to 40 A. we can see it on the
meter board of each and every house.
When the current drawn by load exceeds the rated value, it acts and trips the
circuit, the protecting the apparatus, operator and appliance.
Advantages of MCB
1.They act and open the circuit in less than 5 milli seconds.
2.Automatic switch off under overload and short circuit condition
3.No fuse to replace or rewire. It needs no repairs.
4.Supply is restored by resetting it again.

3. EARTH LEAKAGE CIRCUIT BREAKER
This is a domestic safety device, which trips the circuit when there is a small
leakage to earth or body of the appliance. Thus it protects the operator from
shocks and accidents. This is connected in the circuit of the appliance to be
protected.
There are two types of ELCB
1. Voltage Earth Leakage Circuit Breaker
2. Current Earth Leakage Circuit Breaker
4.MCB & ELCB
It is the combination of both MCB and ELCB placed in one unit. It acts on both
the occasion of earth leakage and overload and protect the circuit, appliance
and the operator.
5.EARTHING OR GROUNDING
Connecting the metal body of an electrical appliance, machinery or an electrical
installation to earth, through a low resistance wire, Is called Earhting or
Grounding.
Necessity of Earthing
Earthing is necessary for all domestic, commercial and industrial installation to
safeguard the operator, tall buildings and machinery against lightning.
Metal body of all the electrical appliances , equipment and machinery, the earth
points of all three-pin sockets and the body of the energy meter are connected
to earth through a thick G.I. wire.
Whenever a live wire comes in contact with the body of the appliance, it is
directly connected to earth the grounding wire and hence the body voltage
comes to zero. Therefor the operator does not get any shock, when he comes in
contact with body of the appliance.
The high voltage included during lightning is discharged to earth through
grounding wire and thereby building and machinery are protected.
SELF CHECK 2.1-1

electronic circuit
ANSWER KEY 2.1-1
electronic circuit
1.Fuse Wire or Fuse

2.MCB – Miniature circuit breaker
3.ELCB – Earth Leakage Circuit Breaker
4.ELCB & MCB
5.Earthing or Grounding
LO2. INSTALL ELECTRICAL PROTECTIVE DEVICES
1. Safety procedures are followed in line with job requirements
2. Correct procedures for installation of electrical protective devices are
performed in line with job requirements and PEC
3. Schedule of work is followed to ensure work is completed in an agreed
time, to a quality standard and with a minimum waste
4. Further instructions are sought from a supervisor if unplanned events or
conditions occur
5. On-going checks of quality of work are done in accordance with
instructions and requirements

CONTENT:
 DOLE Department Order No. 13 s. 1998 Guidelines Governing
Occupational Safety and Health in the Construction Industry
 Philippine Electrical Code (PEC) requirements regarding installation of
electrical protection devices
 Uses of different protective devices- requirements
CONDITIONS:
 Masonry
application.
METHODOLOGIES:
ASSESSMENT METHODS:
 Written test
INFORMATION SHEET NUMBER 2.2.1: INSTALL ELECTRICAL
PROTECTIVE DEVICES
HAZARDS AND RISKS
What is the difference between 'hazard' and 'risk'?
A hazard is something that can cause harm, eg electricity, chemicals, working
up a ladder, noise, a keyboard, a bully at work, stress.

Risk is the chance or probability that a person will be harmed or experience an
adverse health effect once to a hazard. It may also apply to situations with
property or equipment loss.
A risk is the chance, high or low, that any hazard will actually cause somebody
harm.
For example, working
alone away from your office can be
a hazard. The risk of personal
danger may be high. Electrical
repair is a hazard. If
someone accidentally
turned-on the power the
worker’s life will be in a 'high-risk'
category.
Five Basic Workplace Hazards
There are five major types of hazards which can put both your health and your
safety at risk.
1. Chemical hazards
2. Physical hazards
3. Biological hazards
4. Ergonomic hazards or job related hazards
5. Psychological hazards or stress
CHEMICAL HAZARDS
If you are working with cleaning products, bleaches, paints,
and other chemical agents, you need to understand what a
chemical hazard is as well as how to protect yourself.

Chemical hazards include:
 liquids such a cleanser,
 acids, and paints
 vapors and fumes such as
 welding fumes
 gases such as carbon monoxide
 products that can catch fire or explode
PHYSICAL HAZARDS
Physical hazards include:
 Machinery
 Electrical power
 Noise
 Power and hand tools
 Working and walking surfaces
 Trip and fall hazards
 Ladders and scaffolds
 Heat and cold
 ventilation
BIOLOGICAL HAZARDS
Why be careful around ticks, mouse droppings, bird poop and
wild animals? Because you might get sick from working
around certain animals, including
people. Biological hazards include bacteria, viruses, insects, plants,
birds, animals, and humans. The risks run from skin irritation and
allergies to infections.
Dangers can come from:
• unclean restrooms
• mold and fungus
• bacteria
• insect stings
• animal bites
• poorly stored medical waste
ERGONOMIC HAZARDS

If your job is poorly designed, you can develop long term health
problems. These problems can arise from simple things, like
working for long periods in an awkward position or having to
make the same motions over and over again.
Problems can come from:
 lighting
 chairs
 lifting
 repeated movements
 computer screens
PSYCHOLOGICAL HAZARDS
Those that are basically causing stress to a worker. This
kind of hazard troubles an individual very much to an extent
that his general well-being is
affected
Stress can lead to long-term health problems. Headaches, anxiety, and
impatience are early signs of stress.
Workplace causes of stress include:
• heavy workloads
• lack of control over the pace of work
• shift work
• noise
• working by yourself
• fear of job-loss
• conflict with the employee

What are examples of a hazard?
Workplace
Hazard
Example of Example of Harm
Caused
Hazard
thing knife cut
substance benzene leukemia
material asbestos mesothelioma
source of energy electricity shock, electrocution
condition wet floor slips, falls
process welding metal fume fever
practice hard rock mining silicosis
THRESHOLD LIMIT VALUE
One of the most critical among the hazards that one may encounter is
the chemical hazard. Chemical may produce reactions that may endanger

ones health and life. This is the reason why the American Conference of
Governmental Hygienist (ACGIH) established a threshold limit value (tlv).
TLV is the term used by the American Conference of Governmental
Hygienists (ACGIH*) to express the airborne concentration of a material to
which nearly all persons can be exposed day after day, without adverse
health effects
SELF CHECK 2.2-1:
Given below is the list of common workplace hazards. Write at least three
examples of each type of hazard.
1. Chemical hazard
________________________
________________________

________________________
2. Physical hazard
________________________
________________________
________________________
3. Biological hazard
________________________
________________________
________________________
4. Ergonomic hazard or Job related
________________________
________________________
________________________
5. Psychological hazards
________________________
________________________
________________________
ANSWER KEY 2.2-1:
1.Chemical hazard
 liquids such a cleanser,
 acids, and paints
 vapours and fumes such as welding fumes
 gases such as carbon monoxide
 products that can catch fire or explode
2.Physical hazard
 Machinery
 Ladders and scaffolding

 Trip and fall hazards
 Electrical power
 Heat cold
3. Biological hazard
 unclean restrooms
 mold and fungus
 bacteria
 insect stings
 animal bites
 poorly stored medical waste
4. Ergonomic Hazard or Job related hazard
 lighting
 chairs
 lifting
 repeated movements
 computer screens
5. Stress
 heavy workloads
 lack of control over the pace of work
 shift work
 noise
 working by yourself
 fear of job loss
 conflict with the employer

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