Technology andLivelihood Education
Industrial Arts (Electrical Installationand Maintenance)
Quarter 1 – Module 1Installing Electrical Lighting System,Auxiliary Outlets and Lighting Fixtures
10
Department of Education • Republic of the Philippines
Technical-Livelihood Education – Industrial Arts Grade 10Alternative Delivery ModeQuarter 1 – Module 1: Installing Electrical Lighting System, AuxiliaryOutlets and Lighting SystemFirst Edition, 2020
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Published by the Department of Education – Division of Bukidnon
Development Team of the ModuleAuthor: Marlino A. AndamonEditors: Emmanuel Yap, Renato M. Gagarin, Ma. Nelly M. VildosolaReviewer: Mary Jane R. Cardente, PhDIllustrator/Layout Artist: Marlino A. AndamonManagement Team:Chairperson: Arturo B. Bayocot, PhD, CESO III
Regional DirectorCo-Chairpersons: Victor G. De Gracia Jr., PhD CESO V
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Members: Elbert R. Francisco, PhD, Chief ES, CIDMary Jane R. Cardente, PhD, EPS in TLERejynne Mary L. Ruiz, PhD, LRDMS ManagerJeny B. Timbal, PDO IIShella O. Bolasco, Division Librarian
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TABLE OF CONTENTS
Page
What This Module is About…………………………………………………. i
How to Learn from this Module…………………………………………......ii
Icons of this Module……………………………………………………..…. iii
What I Know………………………………………………………………….vi
WHAT I NEED TO KNOW………………………………………………….1
LESSON 1: Wires and Cables
What I Need to Know………………………………………….2
What I Know………………………………………………...….3
What’s In………………………………………………………...5
What’s New……………………………………………….….…6
What is it………………………………………………………...7
What’s More………………………………………………….... 8
What I Have Learned …………………………………………10
What I Can Do………………………………………………….11
Assessment 1 ………………………………………………… 12
LESSON 2: Common Electrical Symbols
What I Need to Know…………………………………………...14
What I Know……………………………………………………..15
What’s In…………………………………………………………16
What’s New……………………………………………………...17
What is It…………………………………………………………18
What’s More……………………………………………………..20
What I Have Learned…………………………………………...21
What I Can Do…………………………………………………..21
Assessment: (Post Test)…………………………………………………...22
Additional Activities…………………………………………………………23
Key to Answers…………………………………………………………. ….25
10Technology and
Livelihood EducationIndustrial Arts (Electrical Installation
and Maintenance)Quarter 1 – Module 1
Installing Electrical Lighting System,Auxiliary Outlets and Lighting
Fixtures
Department of Education • Republic of the Philippines
This instructional material was collaboratively developed and reviewed byeducators from public and private schools, colleges, and or/universities.We encourage teachers and other education stakeholders to email their
feedback, comments, and recommendations to the Department ofEducation at [email protected]
We value your feedback and recommendations.
1
What This Module Is AboutWhat would our lives be like without electricity? How do you feel whenever
a brownout occurs? A power interruption certainly throws our lives off balance,affecting so much of our activities whether this is in the home, office, or industry. Nodoubt, electricity is a necessity. But how is it transmitted? How it is controlled?
Electrical wires and cables, no doubt, play an important part in our day-to-day lives and activities.
This module is designed to help you identify the significant relationshipbetween wires and cables, electrical symbols, wiring diagrams, and flexible armoredcable. Through this, you will gain a better understanding on the important uses ofwires and cables in the transmission of electricity.
Introductory MessageFor the Facilitator:
Welcome to the Technology and Livelihood Education - Industrial Arts(Electrical Installation and Maintenance) Grade 10 Alternative Delivery Mode (ADM)Module on Installing Electrical System, Auxiliary Outlets and Lighting Fixtures.
This module was collaboratively designed, developed and reviewed byeducators from public institutions to assist you, the teacher or facilitator in helpingthe learners meet the standards set by the K to 12 Curriculum while overcoming theirpersonal, social and economic constraints in schooling.
This learning resource hopes to engage the learners into guided andindependent learning activities at their own pace and time. Furthermore, this alsoaims to help learners acquire the needed 21st century skills while taking intoconsideration their needs and circumstances.
In addition to the material in the main text, you will also see this box in thebody of the module:
As a facilitator you are expected to orient the learners on how to use thismodule. You also need to keep track of the learners' progress while allowing them to
Notes to the TeacherAt the end of this module the teacher must still assess whether learningcompetencies were successfully met or another activity will be given toenhance learning.
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manage their own learning. Furthermore, you are expected to encourage and assistthe learners as they do the tasks included in the module.
For the learner:
Welcome to the Technical-Livelihood Education - Electrical Installation andMaintenance Alternative Delivery Mode (ADM) Module on Installing ElectricalLighting System, Auxiliary Outlets and Lighting Fixtures .
The hand is one of the most symbolized part of the human body. It is oftenused to depict skill, action and purpose. Through our hands we may learn, createand accomplish. Hence, the hand in this learning resource signifies that you as alearner is capable and empowered to successfully achieve the relevantcompetencies and skills at your own pace and time. Your academic success lies inyour own hands!
How to Learn From This ModuleThis module was designed to provide you with fun and meaningful
opportunities for guided and independent learning at your own pace and time. Youwill be enabled to process the contents of the learning resource while being an activelearner.
Icons of this Module
This module has the following parts and corresponding icons:
What I Need to KnowThis will give you an idea of the skills orcompetencies you are expected to learn inthe module.
What I KnowThis part includes an activity that aims tocheck what you already know about thelesson to take. If you get all the answerscorrect (100%), you may decide to skip thismodule.
What’s InThis is a brief drill or review to help you linkthe current lesson with the previous one.
What’s NewIn this portion, the new lesson will beintroduced to you in various ways such as astory, song, poem, problem opener, activityor situation.
What Is ItThis section provides a brief discussion ofthe lesson. This aims to help you discover
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and understand new concepts and skills.
What’s MoreThis comprises activities for independentpractice to solidify your understanding andskills of the topic. You may check theanswers to the exercises using the AnswerKey at the end of the module.
What I Have LearnedThis includes questions or blanksentence/paragraph to be filled in to processwhat you learned from the lesson.
What I Can DoThis section provides an activity which willhelp you transfer your new knowledge or skillinto real life situations or concerns.
AssessmentThis is a task which aims to evaluate yourlevel of mastery in achieving the learningcompetency.
Additional ActivitiesIn this portion, another activity will be given toyou to enrich your knowledge or skill of thelesson learned. This also tends retention oflearned concepts.
Answer KeyThis contains answers to all activities in themodule.
At the end of this module you will also find:
The following are some reminders in using this module:
1. Use the module with care. Do not put unnecessary mark/s on any part of themodule. Use a separate sheet of paper in answering the exercises.
2. Don’t forget to answer What I Know before moving on to the other activitiesincluded in the module.
3. Read the instruction carefully before doing each task.
References Richter, Herbert P. and Schwan, Creighton W.Practical Electrical Wiring:16th Edition.
Fajardo, Max P. and Fajardo, Leo B. ElectricalLayout and Estimates.
Roland E. Palmquist. Audel House Wiring, 7thEdition. Publisher: John Wiley & Sons Canada,Ltd.; 7th Edition., Edition (Feb 28 1991)
4
4. Observe honesty and integrity in doing the tasks and checking your answers.5. Finish the task at hand before proceeding to the next.6. Return this module to your teacher/facilitator once you are through with it.
If you encounter any difficulty in answering the tasks in this module, do nothesitate to consult your teacher or facilitator. Always bear in mind that you are notalone.
We hope that through this material, you will experience meaningful learningand gain deep understanding of the relevant competencies. You can do it!
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Pre-TestDirection: Do not scan the pages of this module. Please answer the questions
that follows. Write your answer on a separate paper.
1. These are conductors 3.26mm or No.8AWG and smaller in sizes.A. Wires B. Cables C. Solid wires D. Stranded wires
2. Which of the following electrical material are larger than wires.A. Wires B. Cables C. Solid wires D. Stranded wires
3.This contains of a group of wires twisted together to form a metallic string.A. Wires B. Cables C. Solid wires D. Stranded wires
4. What is the equivalent diameter size of number 10 AWG wire in millimeter(mm)?A. 2.05mm B. 2.59mm C. 3.26mm D. 3.11mm
5. What is the equivalent diameter size of number 8 AWG wire in millimeter(mm)?A. 2.05mm B. 2.59mm C. 3.26mm D. 3.11mm
6. What do you call a plastic or metal material that is used for mounting ofconvenient outlets and switches on walls?A. Utility box B. Junction box C. Frames D. Fitting
7. This is an electrical material which consists only of a single conductor.A. Cables B. Solid wires C. Wires D. Stranded wires
8. What is the appropriate tool used in cutting flexible armored cable.A. Pliers B. Backsaw C. Hacksaw D. Knife
9. These are electrical materials that allow electric current to flow freely.A. Insulator B. Rubber C. Metal D. Conductors
10. These are bare wires used for overhead transmission lines and forground wires.A. Aluminum conductors B. Thermoplastic wiresC. Non-metallic sheathed cable C. Flat cord
11. Which of the following material has 2or 3 conductors used for wiringInstallation in buildings?A. Welding cable B. Armored cable C. Royal cord D. Control cable
12. This is used to determine the conductor size for most applications.A. National Electric Code B. NEMAC. Philippine Electrical Code D. National Building Code
13. A copper conductor is to supply an air conditioning load which has anameplate rating of 22A. What size of THHN wire is safe andeconomical?A. 8.0mm B. 5.5mm C. 3.5mm D. 2.0mm
14.This wire or cable is used for radio frequency antenna installation, andRadar transceiver installation.A. Coaxial cable B. Royal cord C. Control cable D. Duralene
15. A wire used for wiring electric ranges, hot water heaters, stoves andHairdryers where both heat and moisture resistance is desirable.A. Duralene B. Coaxial cableC. Asbestos covered nickel cord D. Steel tape armored power cable
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This module was designed and written just for you. It is here to help you master theprocedures in installing electrical lighting system, auxiliary outlets and lightingfixtures. It includes instructions on how to select and install lighting system and
auxiliary outlets. It also helps the learners to develop a sense of
hard work in performing your job in accordance to the regulations set by the NationalElectrical Code and the Philippine Electrical Code.
The scope of this module permits it to be used in many different learningsituations. The language used recognizes the diverse vocabulary level of students.The lessons are arranged to follow the standard sequence of the course. But theorder in which you read them can be changed to correspond with the textbook youare now using.
Learning Competencies:
TLE- Install Electrical Lighting System, Auxiliary Outlets and LightingFixtures
The module is divided into three lessons, namely:
Lesson 1 – Wires and Cables Lesson 2 – Common Electrical Symbols
After going through this module, you are expected to:
1. understand the application of wires and cables in accordance with PECstandard;
2. explain the standards in the installation of lighting system and auxiliary outletsusing wires and cables;
3. explain the conversion table of conductors;4. identify the common electrical symbols; and5. draw the different electrical diagrams.
What I Need To Know
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Lesson
1 Wires and Cables
What I Need to Know
Are you ready for another exciting learning experience? In this lesson youare expected to achieve the following objectives!
Learning Competencies:TLE- Install electrical lighting system, auxiliary outlets and lighting fixtures.
Lesson 1 Wires and Cables
After going through this module, you are expected to:1. understand the application of wires and cables in accordance with PEC
standard.
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What I Know
Choose the letter of the best answer. Write the chosen letter on a separate sheet ofpaper.
1. Which of the following are bare solid or stranded conductor used for overheadtransmission lines and ground wires.
a. Aluminum or copper conductorb. Non-metallic sheathed cable (type NM)c. Thermoplastic covered fixture wire (type TF)d. Aluminum PE or copper insulated line wire
2. This wire is used for building wiring installation in dry and wet locations andflame retardant and moisture resistant wire.a. Thermoplastic portable cords (types SJT & ST)b. Thermoplastic wire (type TW)c. Control cable (braided type)d. Flat cord (type SPT)
3. This wire is used for wiring motorized engines and appliances with hightemperature, and for switch board wiring.a. Temperature type ((type HI)b. Control cablec. Asbestos covered nickel cordd. Steel tape armored power cable with ground wire
4. Which of the following is a multi-conductor cable generally used for interiorwiring installations in dry and wet locations.a. Power cableb. Nonmetallic sheathed cablec. Royal cabled. Submersible pump cable
5. What is the equivalent diameter size of number 8 AWG wire in millimeter?a. 2.05mm b. 2.59mm c. 3.26mm d. 3.11mm
6. Which of the following equivalent diameter size of number 10 AWG wire inMillimeter (mm)?a. 2.05mm b.2.59mm c. 3.26mm d. 3.11mm
7. What is the appropriate tool used in cutting flexible armored cable.a. Pliers b. Backsaw c. Hacksaw d. Knife
8. What do you call a plastic or metal material that is used for mounting ofConvenient outlets and switches on walls?a. Fittings b. Frames c. Junction box d. Utility box
9. Which of the following safety devices automatically cuts off current thatExceeds the circuit rating.a. Circuit b. Circuit breaker c. Conduit d. Galvanic reaction
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10. It is used for branching conductors and enclosing splices.a. Frames b. Fittings c. Junction box d. Utility box
11. This is the process of removing sharp edges or burrs left afterCutting the pipe.a. Finishing b. Reaming c. Shaping d. Smoothing
12. It is the maximum recommended number of 8.0mm (no.8 AWG) wiresA 20mm (3/4 inch) diameter conduit can accommodate.
a. 6 b. 8 c. 10 d. 1213. What size of conduit can accommodate at least ten (10) 8.0mm
(No.8 AWG) wires?a. 3/8 b.1/2 c.3/4 d.1 ¼
14. What is the standard length of rigid metallic conduit?a. 10ft. b. 12ft. c.14ft. d. 20ft.
15. It is a short length conduit or tubing which is used to extend a conduitSystem and also used between conduit and tubing such as boxes orEnclosures between two boxes.a. connector b. condulets c. coupling d. nipple
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This lesson deals with the basic provisions in Electrical Installation andMaintenance set by the standards of the Philippine Electric Code and the NationalElectrical Manufacturers Association. The purpose of this is for the safety measuresof the property and the owner from the hazards brought from misuse of electricity.
Notes to the Teacher
Did you successfully identify and describe the terms relatedto wires and cables? By this time. You know the important
terms about wires and cables. To step up your understanding,let us find the relationship among the terms related to the
types and sizes of wires and cables.
What’s In
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What’s New
Definition of Terms:
Wires - are those conductors 3.26mm or no.8AWG and smaller in sizes.Cables - on the other hand, are those which are larger than wires. So, wires aresmall cable while cables are big wires.Wires andCablesare either:Strandedwire - itcontainsof a groupof wirestwisted toform a metallic string.Solid - wire consists only of single conductors.AWG – American wire gauge used to measure the diameter of wires.Switch- An electrical material used to control the flow of current.Load – it is considered as the current consuming device.Wires – an electrical material where the current flows.Source – it is where the current is taken to supply energy to appliances and gadgets.Flexible armored cable – used in building wiring installation and it is also used in wetand dry location.Wiring diagram – these are used by electricians as their guide in installing electricalwirings in buildings and houses.
The table below shows the conversion of conductors:
Table 1. Conversion Table of Conductors American Wire Gauge (AWG) toWireDiameter(mm)
What is It
Wire Gauge #AWG
Diameter inMillimeter (mm)
Wire Gauge #AWG
Diameter inMillimeter (mm)
# 40 AWG 0.078mm # 17AWG 1.150mm# 39 AWG 0.088mm # 16AWG 1.291mm# 38AWG 0.101mm # 15AWG 1.450mm# 37AWG 0.114mm # 14AWG 1.628mm#36AWG 0.127mm # 13AWG 1.829mm# 35AWG 0.142mm # 12AWG 2.052mm# 34AWG 0.160mm # 11AWG 2.300mm
# 33AWG 0.180mm # 10AWG 2.590mm# 32AWG 0.203mm # 9AWG 2.910mm# 31AWG 0.226mm # 8AWG 3.263mm# 30AWG 0.254mm # 7AWG 3.674mm# 29AWG 0.287mm # 6AWG 4.115mm# 28AWG 0.320mm # 5AWG 4.621mm# 27AWG 0.360mm # 4AWG 5.189mm# 26AWG 0.403mm # 3AWG 5.827mm
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Let’s Discuss!This module is written to introduce to the learner to the fascinating world of
electricity. It will not just arouse interest in electricity but hopefully will encourage thelearner to find the opportunity and see it as a money-making venture, whether as asource of income or a lifelong career. Even if you do not pursue it as a career,gaining an appreciation and working knowledge of electrical services can be usefulin your everyday lives.
This module has the hands- On practices in installation of Electrical LightingSystem on Auxiliary Outlets and Lighting Fixtures. This module covers wires andcables, electrical symbols, wiring diagram, and installation activities using armoredcable, n0n- metallic sheathed cable and flexible metallic tubing.
Wires are those conductors 3.26mm or No. 8AWG and smaller in sizes.Cables are those which are larger than wires. Therefore, wires are small cable whilecables are big wires.Wires and cables ae either:
Stranded wire- it contains a group of wires twisted to form a metallicstring.
Solid wire- consist only of single conductor.Generally, wires and cables available in the market are even numbers in
American Wire Gauage.Below is a simple schematic diagram of an electric circuit. Label the parts of thecircuit.
These are the answers to the parts of an electric circuit:
1. Load
2. Source of Current (Battery)
3. Switch
4. Wires
A complete circuit has different components. These are the components of acomplete circuit.
1. Source of current – this is where the electricity is taken to supply energy toappliances and gadgets.
2. Switch – is used to control the flow of current.
3. Load – is considered as the current consuming device.
4. Wire – isused as thepath of electriccurrent.
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In Electrical Installation and Maintenance the use of correct sizes of wires isvery important. The number of loads at home corresponds to the number of wires tobe used in the electrical installation at home. Another important consideration inhouse wiring installation is the computation of loads. The most common sizes ofwires used are wires number 14 AWG and number 12 AWG. In lighting circuit thenumber 14 AWG wire is used. While in convenience outlets the number 12 AWGsize of wire is used. In electrical installation you should use the correct tools for theright job. Safety measures are also taken up for the safety of the learners.
To avoid overloading, short circuit, and faulty wiring correct sizes of wires andtypes of wires are used in the electrical installation. The sizes of wires determinesthe current capacity the wires can carry. Bigger wires can carry large amount ofcurrent while small wires can carry small amount of current. House wiring installationuses small wires while electrical transmission lines uses big wires.
Types of Lighting Fixtures:
Most people take the light bulb for granted, a most common fixture we seeeverywhere- in homes, offices, in the community.
The lamp is the most essential fixtures in electricity since it provides lightDuring the worlds dark hours.Codes Governing Wiring Installation.
1. The Philippine Electrical Code-was established to ensure the safe practiceOf electrical wiring. The PEC includes instructional safety standardsOn the installation of electrical material and equipment such asLighting fixture, conduits, and motors.
2. The National Building Code-is implemented to safeguard life and property.
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What’s MoreActivity 1.1 General Electrical Symbols
A. Draw the Symbol of the following electrical Description:
1. Lightning Arrester-
2. Ground (Earth) –
3. Circuit Breaker-
4. Incandescent Lamp-
5. Duplex Convenience Outlet-
In Electrical Installation and Maintenance another important considerations arethe electrical symbols. They give information and guidance to the people andspecially to the electrician who will do the job.
Like for the example above the lightning arrester serve as the safety device thatwill attract lightning above and bring it to the ground. The lightning arrester isinstalled at the top of the building. Lightning arrester was made and installed inalmost tall buildings in the cities to avoid electric shock and damage of the building.
Another is the ground (earth) it is connected to the appliances so that the owneror user of the appliances cannot experience electric shock. While circuit breaker is adevice that will automatically shut off if there is an overload or short circuit in thehouse or building.
Incandescent lamp is an electrical material that uses current to produce light.For duplex convenience outlet it is a device wherein current is taken to supplycurrent to appliances and gadgets.
All these electrical symbols are useful in electrical wiring installation in housesand buildings. Correct sizes of wires and cables are used in the electrical installationto ensure safety to the houses or buildings and most especially to the people whostay to that building or house.
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What I Have Learned
From the lessons and discussions mentioned above, I learned that…..,
Electric current flows in any conductor, be it solid, liquid or gas. Conductorsare materials that allow electric current to flow freely. Wires and cables areconductors. An electric circuit is a closed path of electrons consisting of a source ofelectricity connected to a load by conductors.
Wiring Materials and Devices:
According to NEMA 2020, wiring devices are current carrying electricalproducts to serve simply as a connection or control point for electrical circuit.
Types of Wires and Cables
Copper or Aluminum conductors Thermoplastic Wires (type TW) Non-Metallic Sheathed Cable (type NM) Flat Cord (type SPT) Intercom Cable Telephone Cable Welding Cable Temperature Wire Automotive Wire Asbestos Covered Nickel Cord Coaxial Cable N0n-Metallic Sheathed Cable Durex Wire
Guide to select wiring devices or materials
Select well known industry manufacturer Find a project that has a multi- year warranty Ask for an easy and fast way to contact the manufacturers support Always ask for the manual of the item Select wiring devices according to the job requirements
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Activity 2
Let’s do more! Answer the following questions.
1. Directions: Match the electrical symbols in column A with the corresponding
Description in column B. Write your answer on a separate sheet of paper.
Column A Column B
1. a. Power panel board
b. Battery
c. Buzzer
d. Crossed Wires connected
2. e. Ground (Earth)
f. Disconnected Switch
g. Loudspeaker
3.
4.
5.
Well Done! I guess you are now ready for the next task.
What I Can Do
17
Let’s sum up!
In this Lesson, you were able to identify the terms related to wires and cables andElectrical symbols which is used in drawing and sketching electrical circuits. Throughthis lesson, you were able to determines the sizes of wires and cables used inelectrical wiring installation. You are also given the opportunity create and apply thedifferent skills learned in electrical installation and maintenance and used it in solvingreal life situations.
Let’s find out what you have learned!Multiple Choice. Choose the letter of the best answer. Write the chosen letter on aseparate sheet of paper.
1.Which of the following are bare solid or stranded conductor used for overheadtransmission lines and ground wires.
a. Aluminum or copper conductorb. Non-metallic sheathed cable (type NM)c. Thermoplastic covered fixture wire (type TF)d. Aluminum PE or copper insulated line wire
2. This wire is used for building wiring installation in dry and wet locations andflame retardant and moisture resistant wire.a. Thermoplastic portable cords (types SJT & ST)b. Thermoplastic wire (type TW)c. Control cable (braided type)d. Flat cord (type SPT)
3. This wire is used for wiring motorized engines and appliances with hightemperature, and for switch board wiring.a. Temperature type ((type HI)b. Control cablec. Asbestos covered nickel cordd. Steel tape armored power cable with ground wire
4. Which of the following is a multi-conductor cable generally used for interiorwiring installations in dry and wet locations.a. Power cableb. Nonmetallic sheathed cablec. Royal cabled. Submersible pump cable
5. What is the equivalent diameter size of number 8 AWG wire in millimeter?a. 2.05mm b. 2.59mm c. 3.26mm d. 3.11mm
6. Which of the following equivalent diameter size of number 10 AWG wire inMillimeter (mm)?a. 2.05mm b.2.59mm c. 3.26mm d. 3.11mm
Assessment 1
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7. What is the appropriate tool used in cutting flexible armored cable.a. Pliers b. Backsaw c. Hacksaw d. Knife
8. What do you call a plastic or metal material that is used for mounting of
Convenient outlets and switches on walls?a. Fittings b. Frames c. Junction box d. Utility box
9. Which of the following safety devices automatically cuts off current thatExceeds the circuit rating.a. Circuit b. Circuit breaker c. Conduit d. Galvanic reaction
10. It is used for branching conductors and enclosing splices.a. Frames b. Fittings c. Junction box d. Utility box
11. This is the process of removing sharp edges or burrs left afterCutting the pipe.a. Finishing b. Reaming c. Shaping d. Smoothing
12. It is the maximum recommended number of 8.0mm (no.8 AWG) wiresA 20mm (3/4 inch) diameter conduit can accommodate.
a. 6 b. 8 c. 10 d. 1213. What size of conduit can accommodate at least ten (10) 8.0mm
(No.8 AWG) wires?a. 3/8 b.1/2 c.3/4 d.1 ¼
14. What is the standard length of rigid metallic conduit?a. 10ft. b. 12ft. c.14ft. d. 20ft.
15. It is a short length conduit or tubing which is used to extend a conduitSystem and also used between conduit and tubing such as boxes orEnclosures between two boxes.a. connector b. condulets c. coupling d. nipple
19
Lesson
2Common ElectricalSymbols
What I Need to KnowAre you ready for another fun learning experience! In this
lesson you are expected to achieve the following objectives:
Learning Competencies:
TLE_ Install Electrical Lighting System, Auxiliary Outlets and LightingFixture
Lesson 2 Common Electrical Symbols
After going through this module, you are expected to:
1. Explain the standards in drawing the common electricalSymbols in accordance with PEC and NEMA standard.
What I Know
Describe the symbols below.
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21
What’s InIn our previous lesson, we discuss about the wires and cables that are used in
household and building wiring installation. Some of the common electrical symbolsare used in sketching or drawing electrical plans. In order for the electrician to have aguide in household wiring they must follow an electrical plan which uses electricalsymbols.
In this lesson, we will be dealing with the important electrical symbols that willguide us in making electrical plans.
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Notes to the Teacher
It is important that the learners must study the first lesson beforeproceeding to the next lesson. The lessons are related to one another andmaking them master the concepts prior to this lesson will ensure qualitylearning. At the end of this module the teacher must still assess whether theobjectives were successfully achieved on another set of activities shall begiven to further enhance learning.
What’s NewAre you ready? Let’s get to know the common electrical symbols!
Electrical Symbols are small drawings or pictograms used to represent manyelectrical devices in a diagram or plan of an electrical circuit.
These symbols are used in sketching schematic diagrams and electrical plansfor numerous types of electrical activities. Practically, the electrical fixture found inthe house or building has a symbol that corresponds with the said fixture on anelectrical wiring diagram. These are very important guide for an electrician orelectrical worker, thus making the wiring easier to install.
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What is it
Let’s Discuss!Electrical symbols are divided into five basic categories. These are the
following.1. General outlets2. Convenience receptacles3. Switches4. Panels, Circuits, and various components
General outlets refer to various types of outlet and junction box. This type ofoutlet can be used for a switch, appliance or lighting fixtures such asincandescent lamps, fluorescent lamps, chandeliers.
Convenience receptacles are outlets for power connection or source. Switches are indicated by the letter S. Some symbols, aside from the letter,
are used to designate the switch required. For example, a three way switch isindicated by the symbol S3W.
Electrical symbols are used to represent the actual fixtures, receptacles, andsystem to be used in the layout of all electrical installation. They are used to speedup the work and eliminate the use, or spelling out, of the word for each component.
Electrical symbols are representation of the actual devices used in theinstallation. The most common receptacle used is the duplex receptacle. The symbolused is a circle with lines. The lines indicate the type of receptacle: one line for singlereceptacle, two lines for duplex, and three lines for triplex.
For lighting fixtures, the symbols usually used are circles for incandescentlamps and rectangles with small circles inside for fluorescent lamps.
The following are the Common Electrical Symbols used in sketching wiringplan and diagrams.
Description Symbol Description Symbol
LightningArrester
ConvenienceOutlet withSwitch
SurgeArrester
Single specialPurposeReceptacle
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Ground(Earth) Single pole Switch
IncandescentLamp
Three Way Switch
FluorescentFixture
Push Button
SingleReceptacle
Circuit Breaker
DuplexReceptacle
Battery
What’s More
Now Let’s Exercise!Activity 1. Identification of electrical symbols
Direction: Identify the word or group of words that correspond to the statement ineach
item. Write your answer on a separate sheet of paper.
____1. A device for breaking the connections of an electric circuit.____2. This is a contacting device installed at an outlet for connection externally bymeans of a plug and a flexible cord.____3. An electrical signal that makes a buzzing sound.____4. This is an insulated stranded wire.____5. This is a bell at a door way and used with a push button.____6. A device installed in two location.____7. An electrical device that automatically shuts off current if there is overloading.____8. This is an electrical equipment that measures voltage in the circuit.____9. A device that measures current in the circuit.____10. This is the pathway of electric current.____11. This is the main distribution center of electricity.____12. These device uses small amount of mercury and a chemically inactive gaslike argon.____13. A device that uses chemical reaction to produce electric current.____14. This is an electrical material that produce intense heat.____15. Which of the following is an electrical accessory that allows anequipment to utilize electricity.
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Well done! Please check whether your answer is correct. It is best to master first thecommon electrical symbols before going to the next part of this module.
WHAT I Have Learned
For the lessons and discussions mentioned above, Ilearned that …….
Electrical Symbols are small drawings or pictograms used to representelectrical devices in a diagram or plan of an electrical circuit.
These symbols are used in sketching schematic diagrams and electricalplans. Any electrical fixture found in the house has a symbol that correspond to thesaid fixture on an electrical wiring diagram. These are very useful guide for anelectrician in doing wiring installation.
What I Can Do
Activity 2What would you do if you encounter these situation?
DANGER HIGH VOLTAGE
______________________________________________________________
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___________________________________________________________________.
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Assessment 2
Multiple Choice. Choose the letter of the best answer. Write the chosen letter on aseparate sheet of paper.
1. These are used to represent the actual fixtures.A. Electrical symbols B. Electrical diagramsC. Sketch D. Drawings
2. These are electrical materials that is used to control the flow of current.A. Receptacle B. Switch C. Wires d) Push button
3. These are devices that automatically shut off the flow of current if there is anoverloading in the circuit.A. Switch B. Fuse C. Circuit breakers D. Battery
4. These are electrical materials where current is taken to supply energy toAppliances and gadgets.A. Switch B. Fuse C. Boxes D. Convenience outlet
5. These material is installed in two locations.A. Single switch B. Three way switch C. Toggle switch D. Push button
6. It is a group of interconnected electrochemical cells connected in series.A. Dry cell B. Wet cell C. Battery D. Generator
7. These refers to various types of outlet or junction box.A. General outlet B. Convenience receptaclesC. Switches D. Auxiliary system
8. These are outlets for power connection or source.A. General outlets B. Convenience receptaclesC. Special purpose receptacles D. Auxiliary system
9. These are outlets for telephones, television, bell, buzzer and other signals.A. General outlets B. Convenience receptacleC. Special purpose receptacle D. Auxiliary system
10. What is the symbol for single pole switch.A. S B. S2 C. S3 D.S3W
11. What is the symbol for three way switch.A. S B. S2 C. S2P D. S3W
12. For lighting fixtures, the symbols usually used are:A. Triangle B. Square C. Circle D. Rectangle
13. This is used to control an electrical circuit from three location.A. S B.S2 C. S2P D. S4W
14. These switch is used to control two loads of different location simultaneously.A. S B. S2 C. S2P D. S4W
15. Draw the symbol for an incandescent lamp.
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Additional Activities
Congratulations for making this far!To further enhance your understanding about the Installing Electrical Lighting
System, Auxiliary Outlets and Lighting Fixtures, I want you to go over the additionaltasks below:
Reading books, watching videos and browsing the internet are considered askeys to the most effective educational activities that can help you deepen yourunderstanding on a certain topic.
In this particular task, conduct extra readings and video viewings in theinternet on the given topics. After successfully perform the assigned task write anarrative report about it.
The learner will have their HANDS- ON:
1. Making some repairs of electrical lighting system
2. Having actual used of the different electrical tools and equipment
3. Mastering the proper handling of the electrical tools.
4. Always have in mind the safety measures when working with electricity.
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Post-TestDirection: Do not scan the pages of this module. Please answer the questions
that follows. Write your answer on a separate paper.
1. Which of the following electrical material are larger than wires.A. Wires B. Cables C. Solid wires D. Stranded wires
2.This contains of a group of wires twisted together to form a metallic string.A. Wires B. Cables C. Solid wires D. Stranded wires
3. What is the equivalent diameter size of number 10 AWG wire in millimeter(mm)?A. 2.05mm B. 2.59mm C. 3.26mm D. 3.11mm
4. This is an electrical material which consists only of a single conductor.A. Cables B. Solid wires C. Wires D. Stranded wires
5. What is the appropriate tool used in cutting flexible armored cable.A. Pliers B. Backsaw C. Hacksaw D. Knife
6. These are electrical materials that allow electric current to flow freely.A. Insulator B. Rubber C. Metal D. Conductors
7. This is used to determine the conductor size for most applications.A. National Electric Code B. NEMAC. Philippine Electrical Code D. National Building Code
8. A copper conductor is to supply an air conditioning load which has anameplate rating of 22A. What size of THHN wire is safe andeconomical?A. 8.0mm B. 5.5mm C. 3.5mm D. 2.0mm
9. Which of the following is a multi-conductor cable generally used for interior wiringinstallation in dry and wet location?A. power cable B. non-metallic sheathed cableC. Royal Cable D. Submersible pump cable
10. Which of the following safety devices which automatically cuts off current thatexceeds the circuit rating?
A. Circuit B. Circuit breaker C. Conduit D. Galvanic Reaction11. It is used for branching conductors and enclosing splices.
A. Frames B. Fittings C. Junction Box D. Utility Box12. What is the standard length of rigid metallic conduit?
A. 10ft. B. 12ft. C. 14ft. D. 20ft.13. Which of the following are bare solid or stranded conductor used for overheadtransmission lines and ground wires?
A. Aluminum or copper conductorB. Non-metallic sheathed cableC. Thermoplastic covered fixture wireD. Aluminum PE or copper insulated line wire
14. What is the equivalent diameter size of number 8 AWG wire in millimeter?A. 2.05mm B. 2.59mm C. 3.26mm D. 3.11mm
15. What is the appropriate tool used in cutting flexible armored cable?A. Pliers B. Backsaw C. Hacksaw D. Knife
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Answer Key
Pre-Test1. A2. B3. D4. B5. C6. A7. B8. C9. D10.A11.B12.C13.D14.A15.C
Assessment 11. Switch
2. Receptacle
3. Buzzer
4. Cord
5. Doorbell
6. Three-way switch
7. Circuit Breaker
8. Volt meter
9. Ammeter
10. Conductor
11. Panel board
12. Fluorescent lamp
13. Battery
14. Incandescent lamp
Post Test1. A2. B3. C4. D5. B6. C7. A8. B9. D10.A11.D12.C13.D14.B15.
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References:Azares, Efren F. and Recana, Cirilo B. Electricity III; Adriana
Publishing: 1999.
Fajardo, Max P. and Fajardo, Leo B. Electrical Layout and Estimates, RolandE. Palmquist. Audel House Wiring, 7th Edition. Publisher: John Wiley& Sons Canada, Ltd.: 7th
For inquiries or feedback, please write or call:
Department of Education - Bureau of Learning Resources (DepEd-BLR)
Ground Floor, Bonifacio Bldg., DepEd ComplexMeralco Avenue, Pasig City, Philippines 1600
Telefax: (632) 8634-1072; 8634-1054; 8631-4985
Email Address: [email protected] * [email protected]
