Department of Education
SPTVE
ELECTRICAL INSTALLATION
AND MAINTENANCE (EIM) 9
Module 1: Week 1-2
Install Electrical Lighting System on auxiliary outlets
REMEGIO A. IBARDALOZA
Writer
GERRY V. DOMALANTA
ELECTRICAL INSTALLATION AND MAINTENANCE
GRADE 10
Validator
Schools Division Office – Muntinlupa City
1
Student Center for Life Skills Bldg., Centennial Ave., Brgy. Tunasan, Muntinlupa City
(02) 8805-9935 / (02) 8805-9940
MODULE 1: Install Electrical Lighting System on auxiliary outlets and lighting fixtures
using non-metallic conduit
LESSON 1: Layout and install electrical wiring using knob and tube method
This module contains the “know” and “do” units in Installation of Electrical
Lighting System on Auxiliary Outlets and Lighting Fixtures. It covers the knowledge,
skills and attitudes required in installing the lighting fixtures. Specifically, this module
covers installation of knob and tube, PVC raceway/molding, rigid non-metallic conduit,
flexible non-metallic conduit, fluorescent lighting fixtures, and incandescent lamp.
After completing this lesson, you are expected to
1. Define using knob and tube wiring method
2. Identify wiring installation in line with PEC/NEC
3. Uses of knob and tube wiring installation
4. Explain the safety procedures in installing electrical wiring strictly followed
the occupational safety and health standard (OSHS)
2
Pretest
Directions: Choose the letter of the best answer. Use a separate sheet of
paper for your answer.
1. What types of wiring method used to support wire smaller than no.8
a. Split knob
c. Solid knob
b. Expose wiring
d. Tube and knob
2. What type of material used to support or anchor as big as no. 8 or even
bigger.
a. Support wire
b. Solid knob
c. Split knob
d. Mica tube
3. These are electrical conductor with 8mm AWG size no. 8 or it can be
smaller.
a. Cable
b. Solid
c. Stranded
d. Wire
4. These are electrical conductor are larger than 8mm AWG
a. Stranded
b. Solid
c. Cable wire
d. Wire
5. The open or exposed wiring method the distance between two conductor
should be maintain in a distance of a
a. 6cm
b. 2 ½ inches
c. 12 cm
d. 8cm
6. It shows the correct way of tying wire the groove of a solid knob
a. Left under over right
c. Left to right
b. Over right under left
d. Right to left
7. What type of material that are used over the top of the split knob
a. Flat washer b. Leather ware c. Lock washer d. Nail washer
8. What are the material need to withstand the split knob
a. Leather washer
b. Nail
3
c. Knob
d. All of the above
9. The open wiring method the distance between knob to another knob the
distance apart
a. 30 ft
b. 30cm and 1 ft
c. 12 inches
10cm d. 2 ft
10. What type of material it gives the wire extra protection from injury wire
ways cross each other
a. Porcelain tube
c. Wood
b. Flexible mica tube
d. Concrete
11. What is the advantage of the knob and tube wiring
a. Temporary installation
b. Economical
c. Lower operation temperature
d. All of the above
12. A gadgets the protect worker from injury or illness cause by having
contact with the danger/hazard in the workplace used by linemen to
remove installation of wire and cables in low and high voltage transmission
lines
a. PPE equipment
c. Pneumatic tool
b. Wrenches
d. All of the above
13. Your employer must conduct hazard assessment in order to
a. Avoid incident
c. Eliminate worker
b. Promote incident
d. None of the above
14. OSH means: a. Occupational Service Healthy b. Occupational Safe and
Healthy c. Occupational Safety and Health d. All of these
15. Who should first to know about the accident that happen in your shop
a. Principal
b. Nurse
4
c. Teacher
d. Doctor
Review of some competencies taken up last school year grade 8
Tools and Equipment
Identify the following tools and instrument
IMAGE OF TOOLS AND INSTRUMENT NAME OF TOOLS & INSTRUMENT
1.
2.
3.
4.
5
5.
6.
7.
6
8.
9.
10.
11.
7
12.
13.
14.
15.
It covers the knowledge, skills and attitudes required in installing the lighting
fixtures. Specifically, this module covers installation of knob and tube, PVC
raceway/molding, rigid non-metallic conduit, flexible non-metallic conduit, fluorescent
lighting fixtures, and incandescent lamp.
8
Instruction: When you are ready to perform this task, ask your teacher to observe the
process and to rate your performance using the assessment criteria. Follow the
pictorial diagram.
INTERPRET ELECTRICAL WIRING PLAN
A. Diagram Problem
1. Draw the schematic diagram of one lamp controlled by a single pull switch
using safety box of fuse box.
2. Draw an actual connection diagram of one lamp controlled by a single pull
switch using safety box of fuse box.
3. Draw a line diagram diagram of one lamp controlled by a single pull switch
using safety box of fuse box.
PRINCIPLES OF KNOB AND TUBE
The open or exposed wiring method is sometimes referred to as the Open
Wiring on Insulators. (PEC section 212) It uses cleats, knobs (split or solid), porcelain
tubes and mica tubing for the support and protection of insulated conductors run in or
on buildings. It may be used in working either outside or inside building in dry or wet
locations. It shall not be used in the following locations:
1. Commercial Garages
2. Theaters
3. Motion Picture Studios
4. Hoist ways
9
5. Hazardous Locations
In the open or exposed wiring method, the wires are visible and are supported
by the knobs. These knobs may be a split or solid type. This is shown in figure 1.
Split knobs are used to support wires smaller than No. 8. Solid knobs are
used to support or anchor wires as big as No. 8 or even bigger. Screws or nails may
be used to fasten the knobs. When a nail is used a leather washer should be placed
between the nail head and the insulator to form cushion and protect the insulator
from breaking. See figure 2.
10
In installing an electrical wiring system with the exposed knob and tube wiring
method, the distance between conductors should be maintained at a minimum
distance of 6 cm. (2 ½ inches) apart. The knobs must have a 30 cm (1 foot) distance
apart. Figure 4 illustrates this provision of PEC.
Whenever wires pass through studs, rafters, floor joists or any wooden part of
a building, the wires are inserted in porcelain tubes or flexible mica tubing. Porcelain
tubes and mica tubing are also provided whenever wires cross each other. It gives
the wire extra protection from injury.
11
Figure 5. Application of Porcelain Tubes and Mica Tubing
Some advantages of the Knob and Tube wiring:
1. It is used in temporary installation, such as construction jobs.
2. It has economical when properly installed.
3. It has a lower operating temperature because of ventilation brought by distances
of the installation.
Safety reminders when installing knob and tube wiring
1. Apply enough pressure on the gimlet when driving it to the wood board. Never
hammer it.
2. Have the auger brace oiled regularly especially the ratchet type.
3. Have your electrician’s knife sharpened enough in order not to nick the wire.
4. Use the appropriate screw driver for the screw.
5. Be sure that the conductors in contact with the wiring surface are enclosed in mica
tubing.
12
6. Be sure that your teacher has checked your work before testing.
7. Be sure that the safety switch is off before making any connection. Apply tape on
all joints/splices.
8. Do not drive the split-knobs completely before the conductors or wires are run or
inserted along the grooves of the knobs.
9. Be sure to test the insulation for short and ground circuit before putting on the
power.
Activity Sheet 1.1
Problem Diagraming New normal
Interpreting electrical wiring plan
1. Draw the schematic diagram of 1 bulb controlled by 1 single pull switch in one
location
2. Draw the actual connection diagram of 1 bulb controlled by 1 single pull
switch in one location
3. Draw the line diagram of 1 lamp controlled by 1 single pull switch in one
location
Activity Sheet 1.2
Problem
1. Draw the schematic diagram of 2 bulbs controlled individually by 2 single pulls
switch in 2 location
2. Draw the actual connect diagram 2 bulbs controlled individually by 2 single
pulls switch in 2 location
3. Draw the line diagram 2 bulbs controlled individually by 2 single pulls switch in
2 location
Activity Sheet 1.3
Problem
1. Draw the schematic diagram of 1 bulb controlled by 2 location by two-3-way
switch
2. Draw the actual connection of 1 bulb controlled by 2 location by two-3-way
switch
3. Draw the line diagram of 1 bulb controlled by 2 location by two-3-way switch
13
JOB SHEET 1.1
Installing one bulb controlled by one single pole single throw (SPST)
switch in one location.
Name ________________________________Year/Section: _____
Date ____________________________________Overall Rating ____
I – Materials Required
Qty
Unit
Description
1
pc
single pole, tumbler switch, surface type
1
pc
porcelain/plastic receptacle, surface type
1
pc
incandescent bulb, 220v, 25w
7
mts
solid wire # 14 t.w.
11
pcs
porcelain/plastic split knobs with screws
1
ft
mica tubing or loom
1
roll
electric tape
1
pc
safety switch/cut out
2
pcs
fuse, 10-a, cartridge type
II- Tools Needed
Screwdrivers
electrician’s knife
Pliers
pull push tape rule
Hammer
III – Procedure
Perform this procedure:
1. Prepare all tools and materials needed.
2. Wear appropriate PPE.
14
3. Install porcelain/plastic receptacle and porcelain cut-out/safety switch to the
desired location.
4. Fasten knobs to their proper places. Do not tighten screws. Provide distance for
the insertion of wires.
5. Provide mica tubing in every termination of connection of the wires.
6. Make connection from receptacle to safety switch and another connection from
switch to safety switch. Tighten screw of knobs.
7. Fasten the switch. Provide porcelain base under it.
8. Mount the bulbs and fuse, then test the wiring before you start.
JOB SHEET 1.2
Installing two bulbs controlled individually by two single pole switch in two
locations
Name ________________________________________ Year/Section: ____
Date _________________________________________ Overall Rating ____
I – Materials Required
Qty
Unit
Description
2
pcs
single pole, tumbler switch, surface type
2
pcs
porcelain/plastic receptacle, surface type
2
pcs
incandescent bulb, 220v, 25w
10
mts
solid wire # 14 t.w.
17
pcs
porcelain/plastic split knobs with screws
3
ft
mica tubing or loom
1
roll
electric tape
1
pc
safety switch/cut out
2
pcs
fuse, 10-a, cartridge type
15
II – Tools Needed
Set of screwdrivers
Set of pliers
Hammer
gimlet
Electrician’s knife
III- Procedure
Perform this procedure:
1. Prepare all tools and materials needed.
2. Wear appropriate PPE.
3. Install porcelain/plastic receptacle and porcelain cut out/safety switch to desired
location.
4. Fasten split knobs to proper location and distances. Do not tighten screws.
Provide clearance for insertion of wires.
5. Provide mica tubing in every connection of the wires. Follow the figure/drawing as
shown.
6. Connect the wires to where it is intended. Refer to pictorial diagram.
7. Fasten switches with base under it.
8. Mount the bulbs and fuses on their respective locations.
9. Connect the power and test the installation
16
JOB SHEET 1.3
Installing one bulb, controlled from two location by two-3-way switch
Name ________________________________________ Year/Section: _____
Date _________________________________________ Overall Rating ____
I – Materials Required
Qty
Unit
Description
2
pcs
three-way switch, surface type
1
pc
porcelain/plastic receptacle, surface type
1
pc
incandescent bulb, 220v, 25w
12
mts
solid wire # 14 t.w.
20
pcs
porcelain/plastic split knobs with screws
3
ft
mica tubing or loom
1
roll
electric tape
1
pc
safety switch/cut out
2
pcs
fuse, 10-a, cartridge type
II – Tools Needed
Set of screwdrivers
Set of pliers
Hammer
Gimlet
Electrician’s knife
III- Procedure
Perform this procedure:
1. Prepare all tools and materials needed.
2. Wear appropriate PPE.
3 .Install porcelain/plastic receptacle and porcelain cut out/safety switch to desired
location.
17
4. Fasten split knobs to proper location and distances. Do not tighten screws.
Provide clearance for insertion of wires.
5. Provide mica tubing in every connection of the wires. Follow the figure/drawing as
shown.
6. Connect the wires to where it is intended. Refer to pictorial diagram. 14
7. Fasten switches with base under it.
8. Mount the bulbs and fuses on their respective locations.
9. Connect the power and test the installation
Assessment Criteria
Dimensions
VS
S
NI
5
3
1
1. Quality: Workmanship, Appearance, Verticality,
Horizontality
2. Accuracy: Dimension;(optional) Accurate
function of elements
3. Method: Observance of safety measures
4. Speed: Submission on time +1, before the
expected time +2, after the expected time – 2
Rating Scale:
VS – Very Satisfactory
S
–
= 15 – 11
= 10 – 5
Satisfactory
Self-Check
Direction: Identify each of the following tools/materials
1.___________________
6. _____________________
18
2. __________________
7. _______________________
3.____________________
8. ____________________
19
4. ____________________
9.______________________
5. ____________________
10. _______________________
Direction: Express what you have learned in this lesson by completing the
sentences below
1. Split knob are used to support wire
______________________________________________________________
______________________________________________________
2. In installing exposed knob and tube wiring method, the distance between two
conductor it should be
______________________________________________________________
______________________________________________________
3. The spacing of the split knob and conductor it should be
______________________________________________________________
____________________________________________________________
20
4. The exposed wiring method it shall not be used in the following
location________________________________________________________
___________________________________________________________
5. Some advantages of the knob and tube wiring is
______________________________________________________________
____________________________________________________________
Assessment Rubrics:
The activity will be evaluated based on the following criteria
Measurement
Points
All dimension will be in mm center to center with a tolerance of + -
20 pts
3mm. (in excess of 2mm from the prescribed tolerance = 0 point)
Workmanship
Includes appropriate and skillful bending, cutting, supporting and
installing flexible armored cable.
•
Bending
10 pts
•
Cutting
10 pts
•
Supporting
10 pts
•
Horizontality and verticality
10 pts
Speed
10 pts
Safety
10 pts
Use of appropriate PPE
10 pts
21
Problem
Activity 1.1
Interpret electrical wiring plan
1. Draw the schematic diagram of 2 bulbs controlled individually by 2 single push
switch in two location
2. Draw the line diagram of 2 bulbs controlled individually by 2 single push
switch in two location
22
Post test
Directions: Choose the letter of the best answer. Use a separate sheet of
paper for your answer.
1. What types of wiring method used to support wire smaller than no.8
a. Split knob b. Expose wiring c. Solid knob d. Tube and knob
2. What type of material used to support or anchor as big as no. 8 or even
bigger.
a. Support wire b. Solid knob c. Split knob d. Mica tube
3. These are electrical conductor with 8mm AWG size no. 8 or it can be
smaller
a. Cable
b. Solid
c. Stranded
d. Wire
4. These are electrical conductor are larger than 8mm AWG
a. Stranded
b. Solid
c. Cable wire
d. Wire
5. The open or exposed wiring method the distance between two conductor
should be maintain in a distance of a
a. 6cm
b. 2 ½ inches
c. 12 cm
d. 8cm
6. It show the correct way of tying wire the groove of a solid knob
a. Left under over right
c. Left to right
b. Over right under left
d. Right to left
7. What type of material that are used over the top of the split knob
a. Flat washer b. Leather ware c. Lock washer d. Nail washer
8. What are the material need to withstand the split knob
a. Leather washer b. Nail
c. Knob
23
d. All of the above
9. The open wiring method the distance between knob to another knob the
distance apart
a. 30 ft
b. 30cm and 1 ft
c. 12 inches 10cm d. 2 ft
10. What type of material it gives the wire extra protection from injury wire
ways cross each other
a. Porcelain tube b. Flexible mica tube c. Wood
d. Concrete
11. What is the advantage of the knob and tube wiring
a. Temporary installation
b. Economical
c. Lower operation temperature
d. All of the above
12. A gadgets the protect worker from injury or illness cause by having
contact with the danger/hazard in the workplace used by linemen to
remove installation of wire and cables in low and high voltage transmission
lines
a. PPE equipment b. Wrenches c. Pneumatic tool d. All of the above
13. Your employer must conduct hazard assessment in order to
a. Avoid incident
c. Eliminate worker
b. Promote incident
d. None of the above
14. OSH means: a. Occupational Service Healthy b. Occupational Safe and
Healthy c. Occupational Safety and Health d. All of these
15. Who should first to know about the accident that happen in your shop
a. Principal
b. Nurse
24
c. Teacher
d. Doctor
Disclaimer:
All information and activities were copied from CBLM Building Wiring Installation Y3
of the Department of Education published in 2008. The publisher makes no warranties
with respect to the accuracy, applicability, and completeness of the contents of this
module. All information and activities contained in this module were reviewed and
refined for distance learning. The publisher does not claim ownership over them.
References:
1. Johnston, Larry et.al., Better Homes and Gardens Wiring 1st Edition, Meredith
Books; 2007,pp.
2. Mulin, R.C., Smith R.L. Electrical Wiring-Commercial, Six Ed., New York: Delmar’s
Publishing Inc.; 1984, pp.
3. Agpoa, Feleciano. Interior and Exterior Wiring Troubleshooting ; National
Bookstore: 1991
4. www.diydata.com/tool/drills/drills.php
5. www.powertoolinstitute.com
6. www.technologystudent.com
EIM GRADE 9
PRE TEST KEY TO CORRECTION
1. A
6. A
11. D
2. B
7. B
12. A
3. B
8. D
13. A
4. A
9. B
14. C
5. B
10. B
15. C
25
26