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Republic of the Philippines Department of Education PUBLIC TECHNICAL-VOCATIONAL HIGH SCHOOLS cueto mhar

Unit of Competency: PERFORM ROUGHING-IN

ACTIVITIES FOR COMMUNICATION AND

DISTRIBUTION SYSTEM

1

Module Title: PERFORMING

ROUGHING-IN ACTIVITIES FOR

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ACKNOWLEDGMENT

Copyright Department of Education 2008 First Published JUNE 2008

This draft was prepared during the Competency-Based Learning Materials Development Workshop conducted at the Marikina Hotel, Marikina City on February 18-22, 2008 and finalized on May 23-25, 2008 at the Development Academy of the Philippines (DAP), Tagaytay City.

This learning instrument was developed by the following personnel: Technology Teacher:

Mr. Noel M. Espineli

General Mariano Alvarez Technical High School GMA, Cavite

Contextual Teacher:

Ms. Gina C. delos Santos

A.F.G.Bernardino Memorial Trade School Lias Marilao, Bulacan

Facilitator:

Dr. Corazon L. Echano Project Coordinator

DepED-TechVoc Task Force Encoders:

Ms. Catherine Pearl Sevilleno

Fund: Department of Education REFERENCES AND FURTHER READING

1. Agpaoa, Feleciano. Interior and Exterior Wiring Troubleshooting; National Bookstore: 1991.

2. Azares, Efren F. and Recana, Cirilo B. Practical Electricity III; Adriana Publishing: 1999.

3. Philippine Electrical Code; Year 2000 Edition; Volume I by the Institute of Integrated Electrical Engineers of the Philippines. First Printing June 2002. 4. www.google.com

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TABLE OF CONTENTS

Page

How to Use this Module ... i

Introduction ... ii

Technical Terms ... iii

Learning Outcome 1: Layout and install telephone terminal Cabinets and frame ... 1

 Learning Experiences/Activities ... 2

 Information Sheet 1.1 ... 3

 Self-Check 1.1 ... 7

 Operation Sheet 1.1 ... 8

Learning outcomes 2: Layout and install wire ways ... 11

 Learning Experiences/Activities ... 12

 Information sheet 2.1 ... 13

 Self check 2.1 ... 17

 Operation sheet 2.1 ... 18

Learning Outcomes 3: Layout and install cabinet tray/cable tray ... 20

 Learning Experiences/Activities ... 21  Information sheet 3.1 ... 22  Self check 3.1 ... 27  Operation sheet 3.1 ... 28 Assessment Plan……….30 Observation checklist………...31

Observation and Questioning checklist………..32

Demonstration……….33 Written Report……….34 Performance test……….35 Answer key 1.1 ... 36 Answer key 2.1 ... 36 Answer key 3.1 ... 36

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HOW TO USE THIS MODULE

Welcome to the Module “Performing Roughing-in Activities for Communication and Distribution System”. This module contains training materials and activities for you to complete.

The unit of competency “Perform Roughing-in Activities for Communication and Distribution System” contains the knowledge, skills and attitudes required for Building Wiring Installation course required to obtain the National Certificate (NC) level II.

You are required to go through a series of learning activities in order to complete each of the learning outcomes of the module. In each learning outcome there are Information Sheets, Operation Sheets and Activity Sheets. Do these activities on your own and answer the Self-Check at the end of each learning activity.

If you have questions, do not hesitate to ask your teacher for assistance. Recognition of Prior Learning (RPL)

You may already have some basic knowledge and skills covered in this module. If you can demonstrate competence to your teacher in a particular skill, talk to your teacher so you do not have to undergo the same training again. If you have a qualification or Certificate of Competency from previous trainings, show it to him/her. If the skills you acquired are consistent with and relevant to this module, they become part of the evidence. You can present these for RPL. If you are not sure about your competence/skills, discuss this with your teacher.

After completing this module, ask your teacher to assess your competence. Result of your assessment will be recorded in your competency profile. All the learning activities are designed for you to complete at your own pace.

In this module, you will find the activities for you to complete and relevant information sheets for each learning outcome. Each learning outcome may have more than one learning activity.

This module is prepared to help you achieve the required competency, in receiving and relaying information. This will be the source of information that will enable you to acquire the knowledge and skills in Building Wiring Installation NC level II independently at your own pace with minimum supervision from your teacher.

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Program/Course: BUILDING WIRING INSTALLATION NC II Unit of Competency: PERFORM ROUGHING-IN ACTIVITIES FOR

COMMUNICATION AND DISTRIBUTION SYSTEM Module Title: Performing Roughing-in Activities for

Communication and Distribution System INTRODUCTION:

This module contains information and suggested learning activities on Performing Roughing-in Activities for Communication and Distribution System. It includes instructions and procedure on how to install telephone terminals, cabinet and frames, wire ways, cable tray and cable bridge.

Completion of this module will help you understand the succeeding module on performing roughing-in activities for communication and distribution system.

This module consists of three (3) learning outcomes. Each learning outcome contains learning activities with instruction sheets. Before you follow the instruction, read the information sheets and answer the self-check and activities provided to assess your competence by your teacher. He/she will check if you have acquired the knowledge necessary to perform the skill portion of the particular learning outcome.

Upon completing this module, report to your teacher for assessment. If you pass the assessment, you will be given a certificate of completion.

SUMMARY OF LEARNING OUTCOMES

Upon completion of the module you should be able to:

LO1 Layout and install telephone terminal cabinets and frame LO2 Layout and install wire ways

LO3 Layout and install cabinet tray/cable tray ASSESSMENT CRITERIA

Refer to assessment criteria of learning outcomes 1-3 of this module. PREREQUISITES

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TECHNICAL TERMS

Ground is an earth or some conducting body that serve in placed of the earth ground.

Bending an effective connection of metallic parts to form a conducive parts.

Cable An assembly of two o more conductors. Cable tray a cable support assembly.

Fittings is any associated materials for connecting end of stock securely.

Rigid refers to firmness, permanent and hard. PEC refers to Philippine Electrical Code. PPE refers to Personal protective equipment. Corrosive vapor is any harmful, poisonous substance.

Wire way is a unit of assembly use for protecting electric wires and cables.

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Program/Course: BUILDING WIRING INSTALLATION NC II Unit of Competency: PERFORM ROUGHING-IN ACTIVITIES FOR

COMMUNICATION AND DISTRIBUTION SYSTEM Module Title: Performing Roughing-In Activities for

Communication and Distribution System

Learning Outcome 1: Layout and install telephone terminal cabinets and frame

Assessment Criteria

1. Philippine Electrical Code (PEC) provisions in the uses, application and installation of telephone terminal cabinet are strictly followed.

2. Telephone terminal cabinets are leveled horizontally and vertically aligned to the structure in line with job requirements.

3. Telephone terminal cabinet is installed in line with job requirements.

4. Tools/equipment needed for the installation are prepared in line with job requirements.

5. Personal safety in installing telephone terminal cabinet is followed.

6. Workplace is cleaned and made safe upon completion of work according to established standard.

Resources

6. Philippine Electrical Code; Year 2000 Edition; Volume I by the Institute of Integrated Electrical Engineers of the Philippines. First Printing June 2002. 7. www.google.com

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LEARNING EXPERIENCES/ACTIVITIES

Learning Outcome 1: Layout and Install Telephone Terminal Cabinet Learning Activities Special Instructions

1. Read the attached information sheet 1.1 about the installation of telephone terminal cabinets and frame

 Do not write anything on the module, provide extra paper in doing the self check and activity sheets.

2. Identify tools and materials used

in installing telephone terminal cabinet.

 Choose tools and materials used in installing telephone terminal

cabinet

3. Answer self check #1 to test your knowledge on installing telephone terminal cabinet.

4. Read/ perform operation sheet about the installation of telephone terminals cabinet and frame

 Consider warning of installing telephone terminal cabinet

 Rate your performance based on the assessment criteria.

 If you do not pass the criteria go back to the operation sheet of installing telephone terminal cabinet

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INFORMATION SHEET 1.1

Provisions of Installing Telephone Terminal Cabinet

Cabinet, according to Philippine Electrical code must have doors and are thus distinguished from large boxes with covers consisting of plates attached with screws and bolts.

The Philippine Electrical code requires that all boxes used to enclose operating apparatus, i.e., Apparatus having moving parts or requiring inspection or attention

Telephone Terminal Wall Cabinet Specifications

1. Generally inside terminal room are preferred. This allows for access to power for telephone equipment. With engineering approval wall Cabinets are acceptable for buildings less than 20,000 square feet with external mounted SRP power cabinets. If power is provided in an inside terminal room Saddleback will collocate with them.

2. Sun West Engineering, Inc. MPOP-09604808 cabinet is the only one approved by Saddleback Communications engineering. Other cabinets may be used but must be approved prior to installation.

3. An area 8’ in front of the cabinet must be kept clear for technician access. 4. One isolated 20 Amp breaker circuit is extended to plywood backboard inside

the cabinet is to be provided.

5. One #6 insulated copper wire terminated at the main power service panel ground bus bar at one end and the other end terminated on a suitable buss bar located on the left side of the cabinet near the splice compartment is to be provided.

6. All access handles to accommodate a padlock.

7. Two 4” conduits equipped with calibrated mule tape are provided for Saddleback Communications facilities. Both enter on the left side of the cabinet. Point off feed locations will be provided by Saddleback Engineering. 8. A maximum on four three foot radius 90 degree bends are allowed in each

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Pictorial diagram of telephone system

Specification of materials, tools and equipment needed for the installation of telephone terminal cabinet:

1. Claw Hammer: Size: Head Weight: 10 02 Materials: Head: Steel

Shaft: Fiber Glass

Use: performing related electrical work 2. Linesman’s Pliers: Size 5 to 10 inches

Material: Steel

Use: to grip and bend crop wire 3. Long nose Pliers: Size 4 to 7 inches

Use: to hold materials in narrow space

4. Level Bar: Size: 22 inches, materials: aluminum Uses: To check horizontal & vertical alignment

5. Try Square: Size: Blade 6 to 12 inches stock 4 to 8 inches Material: Blade Steel

Use: to Mark out or check the work for squareness 6. Pull Push Steel Tape: Size 3 to 16 feet

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Use: to determine the size of the work piece. 7. Screw Driver: Size 3 to 10 inches

Materials: Handle plastic

Use: to drive screw on electrical work 8. Chalk Line Reel: Size 18 to 100 feet

Material: Cotton, Plastic Use: to snap a marked line 9. Plumb Bob: Size: Weight 4lbs.

Material: Brass

Use: to determine vertical line 10. Cross Cut Saw: Size: 60 cm

Material: Hard Steel

Use: to out wood across the grain 11. Cold Chisel: Size: Length 5 to 8 inches

Material: Steel

Use: to cut metal & concrete 12. Telephone Terminal Cabinet

Use: to enclosed Telephone system

13. Frames: used to hold telephone system and terminals in place inside the cabinet.

14. Fitting: used to properly connect conductor pipe lines

15. Adhesive solvent: use to fix fitting and pipes to prevent moisture and ensure closed contact.

16. Utility Box: used to enclosed wires on outlets. 17. Junction Box: Location for wire joints and splices.

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ASSESSMENT (SELF-CHECK) 1.1

LO 1: Layout and install telephone terminal cabinet and frames.

A. Direction: On your answer sheet, write the letter of the correct answer that describes each item.

1. It is used to mark out or check the work for squareness.

a. Level Bar c. Plumb Bob b. Try Square d. Chalk Line Reel

2. It is a tool used to check the horizontal and vertical alignment.

a. Screw Driver c. Level Bar b. Try Square d. Plumb Bob

3. It is used to enclosed telephone system and connections.

a. Junction Box c. Utility Box b. Telephone Terminal Cabinet d. Fitting

4. What do you call plastic made material used to hold convenient

outlet on walls?

a. Junction Box c. Frames b. Utility Box d. Fitting

5. It is used for splitting conductors and splices.

a. Utility Box c. Fastening Device b. Junction Box d. Adhesive

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OPERATION SHEET 1.1

LO 1: Layout and install telephone terminal cabinet Supplies and Materials

 Telephone terminal cabinet  Frames  Fitting  Adhesive solvent  Utility box  Junction box  Fastening device

- Bolts and nuts - Screw with tux Tools

 Lines Man’s Pliers  Long Nose Pliers  Diagonal Cutting  Gimlet

 Level Bar  Try Square  Posh Tape Rule  Claw Hammer  Philip Screw Driver  Flat Screw Driver  Chalk line Reel  Plumb Bob  Cross Cut Saw  Cold Chisel Conditions

The following resources are needed: 1. Observe proper use of PPE.

2. The workplace must be free from obstruction.

3. The installed telephone terminal cabinet should conform to the drawing plan details and standard.

Procedure

1. Prepare the area for the installation of telephone terminal cabinet and frames.

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3. Follow the proper use of PPE for any protection, body protection, head protection, hand and foot protection.

4. Ensures that mounting screws are installed in the upper and lower flanges on the right and left side of the cabinet.

5. Check the vertical and horizontal alignment of the cabinet using testing tool. 6. Locate the power and ground terminations at the top front side of the cabinet

backplane.

7. Observe housekeeping activities.

Work Drawing

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Assessment Criteria

The activity will be evaluated based on the following assessment criteria. Measurement

Points

Mounting heights 15 pts

Distance from door windows 15 pts

Observe use of PPE 15 pts

Check horizontal and vertical alignment 20 pts

Grounding termination 10 pts

Proper use of tools 15 pts

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Program/Course: BUILDING WIRING INSTALLATION NC II Unit of Competency: PERFORM ROUGHING-IN ACTIVITIES FOR

COMMUNICATION AND DISTRIBUTION SYSTEM Module Title: Performing Roughing-In Activities for

Communication and Distribution System Learning Outcome 2: Lay out and install wire ways

Assessment Criteria

1. Philippine Electrical Code (PEC) provisions in the use, application and installation of wire ways are strictly followed.

2. Tools/equipment needed for the installation is prepared in line with job requirements.

3. Wire ways are installed in line with job requirements. 4. Personal safety in installing wire ways is followed.

5. Workplace is cleaned and made safe upon completion of work according to established standard.

Resources

1. Azares, Efren F. and Recana, Cirilo B. Practical Electricity III; Adriana Publishing: 1999.

2. Agpaoa, Feleciano. Interior and Exterior Wiring Troubleshooting; National Bookstore: 1991.

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LEARNING EXPERIENCES/ACTIVITIES

Learning Outcome 2: Layout and Install Wire Ways

Learning Activities Special Instructions 1. Read the attached information

sheet # 2.1 on provisions for metal wireway

 Try to answer the self check without looking at the information sheet.

 If you miss some of the items go over this enabling objectives 2. Answer self check # 2 on

provisions of installing wire ways.

 Refer to answer key

3. Read the sheet no 2.1 on procedures of wireways diagram.

 See layout in operation sheet no 2.1

4. Analyze the step by step procedure of installing wire ways.

 Evaluate yourself if you have knowledge about procedures  If you are not ready go over

operation sheet 2.1 on installing wire way 5. Answer self check no 2.2.  Refer to answer key

6. Perform the procedure of

installing wire way  Rate yourself based on the assessment criteria  If you did not pass the criteria

go over this enabling objectives again

 If you are ready you can now proceed to next activity

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INFORMATION SHEET 2.1

Wire ways are units of assembly of troughs used for housing and protecting electric wire and cable and in which conductors are laid in place after the wire way has been installed as a complete system.

Provisions for Metal Wire Ways

1. No conductor larger than that for which the wire way is designed shall be installed in any wire way.

2. Shall not contain more than 30 current carrying conductors at any cross section.

3. Where insulated conductor are defected within the wire way of greater than 30 degrees.

4. Splices and top shall be permitted within a wire way provided. 5. Dead end of wire way shall be closed.

6. Extensions from wire ways shall be made with cord pendants.

7. Wire ways shall be marked so that their manufacturers name or trademark will be visible after installation.

8. Grounding shall be in accordance with the provision of Article 2.50 of PEC.

Provisions for Non Metallic Wire Ways Uses Permitted:

1. Only for exposed work, except as permitted. 2. Where subject to corrosive vapors.

3. In wet location where listed for the purpose. Uses Not Permitted

1. Where subject to physical damage.

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3. Where exposed to sunlight values listed and marked as suitable for the purpose.

4. Where subject to ambient temperature.

5. For conductors whose insulation temperature limitation would exceed those for which the non – metallic wire way is listed.

Other article for non metallic wire ways

1. No conductor larger than that which non metallic wire way is designed shall be installed.

2. Number of conductors shall not exceed 20 percent of the interior cross sectional area.

3. Splices and taps, shall not fill more than 75 percent of its cross sectional area.

4. Dead end of non metallic wire way shall be closed using listed fitting.

5. Extension shall be made with cord pendant. 6. All have limited smoke producing characteristics.

Electrical Wireways

Wire ways and cable troughs are

designed to protect electrical wires from dust, dirt, water and oil. They are

available in various styles, sizes and fittings for use for wide range of

voltages. They are often used to house and protect power and communications cables for commercial, institutional, industrial and utility needs. these wire way systems consist of wire way and appropriate fittings to complete the installation per the electrical drawings. Electrical wire ways often furnished with polyester powder coat paints. They are available with factory installed dividers to separate power and low voltage wiring housed in the same wire way sections. the

material thickness based on wire way dimensions according to requirements. The base and cover of wire ways are factory assembled and fitted with wing nuts and screws for positive latching. Some wire way bases are provided with

electrical knockouts. They are available with spectrum dimensions like wide and deepness.

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Types of Wire Ways

1. Metal Wire Way – are sheet metal through with hinged or removable covers for housing and protecting electric wire and cable and in which conductors are laid in place after the wire way has been installed as a complete system.

Commercial Metal Wire ways

Installed Metal Wire ways

2. Non Metallic Wire Way – are flame retardant, non metallic through with removable covers for housing and protecting electric wire and cables in which conductors are laid in place after the wire way has been installed as a complete system.

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ASSESSMENT (SELF-CHECK) 2.1

LO 2: Layout and install wire ways

Direction: Fill in the blank with a word or group of word that will make the statement complete. Write your answer on a separate answer sheet.

1. Number of conductors in non metallic wire way shall not exceed ________ percent of the interior cross sectional area.

2. ________ from wire ways shall be made with cord pendant.

3. Non metallic wires way are __________ through with removable cover for housing wires and cables.

4. Are metal through used for housing conductors and has been installed as a complete system is called __________.

5. __________ wire way is permitted where subject to corrosive vapors. 6. The ________ of installed wire way shall be enclosed.

7. Permitted provision in _______ wire way for exposed work.

8. Grounding of wire way shall be in accordance with article ____ of PEC. 9. ______ of wire way are visible after installation.

10. Number of conductors for non metallic wire way shall not exceed ______ percent of interior cross sectional area.

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OPERATION SHEET 2.1

LO 2: Layout and Install Wire Ways

Supplies and Materials

 Wire ways/C – furling  Flat bar/brackets

 Fastening device for wood, concrete and steel Tools

 Linesman’s Pliers  Diagonal Cutting Pliers  Gimlet

 Level Bar  Try Square  Push Tape Rule  Claw Hammer

 Set of Screw Drivers  Chalk line Red  Plumb Bob  Cross Cut Saw  Cold Chisel Conditions

1. Proper selection of conditioned tools. 2. The place for work must be hazard free.

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Procedures

1. Prepare the area for the layout and installation of wire ways. 2. Prepare all the necessary tools, materials and supplies. 3. Wear the appropriate PPE.

4. Layout wire ways in horizontal and vertical direction. 5. Measure the location of support for screw.

6. Install wire way and locate support prior to job requirements. 7. Observe good housekeeping.

Evaluation: The activity will be evaluated based on the following: Assessment Criteria

The students will be evaluated based on the following:

Measurement Points

Horizontal support 1500mm interval 15 pts Vertical support 4500 mm interval 15 pts Workmanship: Including cutting, horizontal

alignment, vertical alignment, marking 20 pts Cutting

- Straight

- Exact measurement 20 pts

Horizontal laying 10 pts

Vertical Laying 10 pts

Marking the trademark 10 pts

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Program/Course: BUILDING WIRING INSTALLATION NC II Unit of Competency: PERFORM ROUGHING-IN ACTIVITIES FOR

COMMUNICATION AND DISTRIBUTION SYSTEM Module Title: Performing Roughing-in Activities for

Communication and Distribution System Learning Outcome 3: Lay out and install cable tray/cable bridge Assessment Criteria

1. Philippine Electrical Code (PEC) provisions in cable tray/cable bridge is strictly followed.

2. Tools/equipments needed for the installation are prepared in line with job requirements.

3. Cable tray/cable bridge is installed in line with job requirements.

4. Personal safety in installing cable tray/cable bridge is followed according to established standards.

5. Final report is prepared upon completion of job. Resources

1. Azares, Efren F. and Recana, Cirilo B. Practical Electricity III; Adriana Publishing: 1999.

2. Agpaoa, Feleciano. Interior and Exterior Wiring Troubleshooting; National Bookstore: 1991.

3. www.google.com 4. www.yahoo.com

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LEARNING EXPERIENCES/ACTIVITIES

Learning Outcome 3: Layout and Install Cable Tray

Learning Activities Special Instructions

1. Read the attached information sheet # 3.1

2. Answer self check #3.1 to test your knowledge on types of cable tray and fitting. 3. Compare your answer to

answer key.

4. If you miss some of the items go over this enabling objective again.

5. Perform the operation sheet number 3.

 Answer the self check without looking at the information sheet.

 You can ask your instructor or any of the advanced trainees to help you in checking your work.

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INFORMATION SHEET 3.1

What is Cable tray?

A cable tray is “a unit or assembly of units of sections and associated fittings forming a rigid structural system used to securely fasten or support cables and race ways”. Cable trays are used to hold up and distribute cables. A. Uses of Cable Tray

Conductors support method somewhat like race way, under prescribed conditions.

 Cable trays support cable the way that roadway bridges support traffic.  A bridge is a structure that provides safe passage for traffic across open

spans.

 Cable tray is the bridge that allows for safe transport of wires across open spans.

 Therefore, think of cable tray as the structural component of a building's electrical system.

B. Types of Cable Tray

1. Through type (or expanded metal – type) Tray – provides a sturdy, flexible system for supporting feeder cables particularly where routing of the runs is devious or where provision for change or modification in circuiting is important.

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2. Ladder – type tray – are used for supporting interlocked – armor cable feeder in many installation.

Ladder Type Tray

3. Solid Bottom – Typically used in application that generates moderate heat.

Solid Bottom Cable Tray

4. Channel – Features a one piece ventilated or solid bottom. Used for installations featuring small amounts of cable supported on short to medium spans.

Channel Cable Tray

5. Single rail aluminum – for light duty application where quick installation is desired.

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6. Wire mesh – for low voltage, telecommunication, and fiber optic cables supported on short span.

Wire Mesh Cable Tray C. Types of Cable Tray Fittings

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. 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 five basic cable tray types:

1. Straight is used to tap two end of cable tray to extend its length.

2. L Junction is a cable tray fitting which is commonly used when the junction is made at the corner or to make right angle turn.

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3. T Junction is a type of fitting which is used to adopt cable tray in straight and tee joining

4. 4 – way Junction is a type of fitting

5. Reducer is a type of fitting which is used to adopt cable tray when it change in size.

Cable Tray Materials

Metallic cable trays are readily available in aluminum, pregalvanized steel, hot-dip galvanized after fabrication, and stainless steel. Aluminum cable tray should be used for most installations unless specific corrosion problems prohibit its use. Aluminum's light weight significantly reduces the cost of installation when Compared to steel

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Cable Tray Materials

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ASSESSMENT (SELF-CHECK) 3.1

LO 3: Layout and install cable tray/cable bridge

A. Direction: On your answer sheet, write the letter of the correct answer before each number.

1. It is used in application with intermediate to long support span. a. Solid Bottom c. Ladder

b. Channel d. Wire Mesh

2. It features a one piece or solid bottom. It is used for installation featuring small amounts of cable supported on short to medium span.

a. Wire Mesh c. Trough b. Ladder d. Channel

3. It is used for light – duty application where quick installation is desired.

a. Single Rail c. Channel b. Wire Mesh d. Solid Bottom

4. Generally used for low voltage, telecommunication and fiber optic application.

a. Wire Mesh c. Channel b. Ladder d. Trough

5. It is the fitting used when tray split in three separate directions? a. L – Junction c. 4 way Junction

b. Drop d. T - Junction

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OPERATION SHEET 3.1

LO 3: Layout and Install Cable Tray Tools

 Linesman’s Pliers  Long nose Pliers

 Diagonal cutting Pliers  Gimlet

 Level Bar  Try Square  Push Tape Rule  Claw Hammer  Set of Screw Driver  Chalk line Reel  Plumb Bob  Cross Cut Saw  Cold Chisel  Cable Tray  Cable Bridge  Flat Bar/Brackets

 Fastening device for wood, concrete and steel  Ladder

Conditions

1. The equipment tools must be properly checked. 2. The workplace must be free from obstruction.

3. The installed cable tray should appear as per the drawing or picture shown.

Procedures

1. Prepare the area for the installation of cable tray. 2. Prepare all the equipment tools and materials. 3. Assemble the cable tray as per company standard.

4. Follow personal safety in installing cable tray according to established standard.

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Assessment Criteria Criteria Points Workmanship 5 Measurement 4 Use of trial 3 Use of PPE 3 Speed 3 Housekeeping 2 Total 20

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ASSESSMENT PLAN

Evidence Checklist

Competency standard: Unit of competency: Title of Module

Ways in which evidence will be collected:

[tick the column]

Obse rv a tion Qu es tio n in g T h ird p a rt y R ep ort De m o n st ra tio n Port folio Writ te n

The evidence must show that the candidate … Get from assessment criteria of the module (CBC)

             

NOTE: *Critical aspects of competency

Prepared by: Date:

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Observation Checklist Student’s name: Teacher’s name: School Competency standards Unit of competency:

Instructions for the teacher:

1. Observe the student [insert description of activity being observed].

2. Describe the assessment activity and the date on which it was undertaken. 3. Place a tick in the box to show that the student completed each aspect of the

activity to the standard expected in the enterprise. 4. Complete the feedback sections of the form.

Date of observation

Description of assessment activity

Location of assessment activity

The student…. If yes, tick the box

can            

Did the student’s overall performance meet the standard?

Yes No

Feedback to student:

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Observation and Questioning Checklist Stuednt’s name: Teacher’s name: School Competency standards Unit of competency:

Instructions for the assessor:

1. Observe the student [insert description of activity being observed].

2. Describe the assessment activity and the date on which it was undertaken. 3. Place a tick in the box to show that the student completed each aspect of the

activity to the standard expected in the enterprise.

4. Ask the student a selection of the questions from the attached list to confirm his/her underpinning knowledge

5. Place a tick in the box to show that the student answered the questions correctly.

6. Complete the feedback sections of the form.

Date of observation

Description of assessment activity

Location of assessment activity

The candidate…. If yes, tick the box

can      

Did the student’s overall performance meet the

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Demonstration Student’s name: Teacher’s name: Unit of competency: Competency standards: Date of assessment: Time of assessment:

Instructions for demonstration

Given the necessary materials the student must be able to:

Materials and equipment:

 to show if evidence is demonstrated

During the demonstration of skills, did the

candidate: Yes No N/A

The student’s demonstration was:

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Written report Student’s name: Teacher’s name: School Competency standards Unit of competency: Task:

Your task is to:

[insert description of task]

Submission date:

Use the checklist below as a basis for judging whether the student’s report meets the required competency standards.

The student’s report…. If yes, tick the box

can solve quantities needed through percentage

can tabulate data correctly

can convert temperature to the required

temperature scale

can fill in appropriate form completely and

correctly

can identify proper method of sealing packed

products

can label correctly packed products

Overall did the student’s report meet the standard? Yes No Comments:

Student’s

signature: Date:

Teacher’s

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PERFORMANCE TEST

Student's Name Date

Competency: Test Attempt

1st 2nd 3rd Directions:

CALL TEACHER, ask teacher to assess your performance in the following critical task and performance criteria below

You will be rated based on the overall evaluation on the right side.

OVERALL EVALUATION Level

Achieved

PERFORMANCE LEVELS

4 - Can perform this skill without supervision and with initiative and adaptability to problem situations.

3 - Can perform this skill satisfactorily without assistance or supervision.

2 - Can perform this skill satisfactorily but requires some assistance and/or supervision. 1 - Can perform parts of this skill satisfactorily, but requires considerable assistance and/or supervision.

Teacher will initial level achieved. PERFORMANCE STANDARDS

For acceptable achievement, all items should receive a

"Yes" or "N/A" response. Yes No N/A

(42)

Answer key for self check # 1.1 1. B 2. C 3. B 4. A 5. B

Answer key for self check #2.1

1. 30 current carry conductor 2. extensions

3. flame retardant 4. wire ways 5. non metallic 6. dead end

7. metallic and non metallic 8. article 2.50 of PEC

9. trademark 10. 20 percent

Answer key for self check #3.1 1. C

2. D. 3. A 4. A 5. C

(43)

Republic of the Philippines

Department of Education PUBLIC TECHNICAL-VOCATIONAL

HIGH SCHOOLS

mhar cueto

Unit of Competency: PERFORM ROUGHING-IN ACTIVITIES FOR

COMMUNICATION AND DISTRIBUTION SYSTEM USING ELECTRICAL METALLIC CONDUIT

Module No.:

2

Module Title: ROUGHING-IN ACTIVITIES FOR

COMMUNICATION AND DISTRIBUTION SYSTEM USING ELECTRICAL METALLIC

(44)

ACKNOWLEDGMENT

Copyright Department of Education 2008 First Published JUNE 2008

This draft was prepared during the Competency-Based Learning Materials Development Workshop conducted at the Marikina Hotel, Marikina City on February 18-22, 2008 and finalized on May 23-25, 2008 at the Development Academy of the Philippines (DAP), Tagaytay City.

This learning instrument was developed by the following personnel: Technology Teacher:

Mr. Rodrigo S. Castillo Bauan Technical High School Bauan, Batangas

Contextual Teacher:

Ms. Gina C. delos Santos

A.F.G. Bernardino Memorial Trade School Lias, Marilao, Bulacan

Facilitators:

Dr. Corazon C. Echano Project Coordinator

DepED - TechVoc Task Force Encoder:

Mr. Lemuel C. Valles Administrative Officer II

Educational Information Division Fund: Department of Education

REFERENCES AND FURTHER READING

1. Azares, Efren F. and Recana, Cirilo B. Practical Electricity III; Adriana Publishing: 1999.

2. Agpaoa, Feleciano. Interior and Exterior Wiring Troubleshooting; National Bookstore: 1991.

3. Richter, Herbert P. and Schwan, Creighton W. Practical Electrical Wiring: 16th Edition.

(45)

TABLE OF CONTENTS

Page How to Use this Module ... i Introduction ... ii Technical Terms ... iii Learning Outcome 1: Layout and install electrical metallic tubing

 Learning Experiences/Activities ... 2  Information Sheet 1.1 ... 3  Self-Check 1.1 ... 6  Operation Sheet 1.1 ... 7  Operation Sheet 1.2 ... 8  Operation Sheet 1.3 ... 10  Job Sheet 1.1 ... 12 Learning Outcome 2: Layout and install rigid metallic tubing

 Learning Experiences/Activities ... 19  Information Sheet 2.1 ... 20  Self-Check 2.1 ... 24  Operation Sheet 2.1 ... 25  Job Sheet 2.1 ... 26 Learning Outcome 3: Layout and install flexible metallic tubing

 Learning Experiences/Activities ... 30  Information Sheet 3.1 ... 31  Self-Check 3.1 ... 33  Operation Sheet 3.1 ... 34  Job Sheet 3.1 ... 35 Learning Outcome 4: Layout and install intermediate metallic tubing

 Learning Experiences/Activities ... 39  Information Sheet 4.1 ... 40  Self-Check 4.1 ... 47  Job Sheet 4.1 ... 48 Assessment Plan ... 51 Observation Checklist ... 53 Observation and Questioning Checklist ... 54 Demonstration ... 55 Written Report ... 56 Performance Test ... 57 Answer Key 1.1 ... 58 Answer Key 2.1 ... 59 Answer Key 3.1 ... 60 Answer Key 4.1 ... 61

(46)

HOW TO USE THIS MODULE

Welcome to the Module “Roughing-in Activities for Communication and Distribution System Using Electrical Metallic Conduit”. This module contains training materials and activities for you to complete.

The unit of competency “Perform Roughing-in Activities for Communication and Distribution System Using Electrical Metallic Conduit” contains the knowledge, skills and attitudes required for Building Wiring Installation course required to obtain the National Certificate (NC) level II.

You are required to go through a series of learning activities in order to complete each of the learning outcomes of the module. In each learning outcome there are Information Sheets, Job Sheets, Operation Sheets and Activity Sheets. Do these activities on your own and answer the Self-Check at the end of each learning activity.

If you have questions, don’t hesitate to ask your teacher for assistance. Recognition of Prior Learning (RPL)

You may already have some basic knowledge and skills covered in this module. If you can demonstrate competence to your teacher in a particular skill, talk to your teacher so you don’t have to undergo the same training again. If you have a qualification or Certificate of Competency from previous trainings, show it to him/her. If the skills you acquired are consistent with and relevant to this module, they become part of the evidence. You can present these for recognition of prior learning. If you are not sure about your competence / skills, discuss this with your teacher.

After completing this module, ask your teacher to assess your competence. Result of your assessment will be recorded in your competency profile. All the learning activities are designed for you to complete at your own pace.

In this module, you will find the activities for you to complete and relevant information sheets for each learning outcome. Each learning outcome may have more than one learning activity.

This module is prepared to help you achieve the required competency, in receiving and relaying information. This will be the source of information that will enable you to acquire the knowledge and skills in Building Wiring Installation NC II independently at your own pace with minimum supervision from your teacher.

(47)

Program/Course: BUILDING WIRING INSTALLATION NC II Unit of Competency: PERFORM ROUGHING-IN ACTIVITIES FOR

COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT

Module Title: Performing Roughing-in Activities for

Communication and Distribution System Using Metallic Conduit

INTRODUCTION:

This module contains information and suggested learning activities on installation of rigid metallic conduit. It includes instruction and procedure on how to install Electrical Metallic Tubing (EMT), Rigid Metal Conduit (RMC), Flexible Metallic Tubing (FMT), and Intermediate Metallic Tubing (IMT).

Completion of this module will help you understand the succeeding module on installing communication device and remote control system.

This module consists of four (4) learning outcomes. Each learning outcome contains learning activities with instruction sheets. Before you follow the instruction, read the information sheets and answer the self-check and activities provided to assess your competence by your teacher. He/she will check if you have acquired the knowledge necessary to perform the skill portion of the particular learning outcome.

Upon completion of this module, report to your teacher for assessment. If you pass the assessment, you will be given a certificate of completion.

SUMMARY OF LEARNING OUTCOMES

Upon completion of the module the students shall be able to: LO1 Layout and install electrical metallic tubing

LO2 Layout and install rigid metal conduit LO3 Layout and install flexible metallic tubing LO4 Layout and install intermediate metallic tubing ASSESSMENT CRITERIA

Refer to assessment criteria of learning outcomes 1-4 of this module. PREREQUISITES

(48)

TECHNICAL TERMS

Circuit refers to tubing, piping or electrical wire installation, which permits flow to and from energy source.

Circuit breaker is a safety device, which automatically open an electrical circuit if overloaded.

Conduit is a pipe or raceway which serves as passage of electrical conductors. Dies and dies stock is a tool used to thread a conduit.

EMT refers to Electrical Metallic Tubing.

Elbow is a 90 degree angle bend fitting commonly used to make quarter bend. FMT refers to Flexible Metallic Tubing .

Galvanic reaction is a reaction between two dissimilar metals.

Hazardous location is a location in which flammable quantity is likely to occur. Hickey is a tool used to bend a conduit.

IMC refers to Intermediate Metallic Conduit.

Offset is a bend used to adopt the conduit from the surface to a particular boxes or fittings.

OHSS refers to Occupational Health and Safety Standard. PEC refers to the Philippine Electrical code.

PPE refers to Personal Protective Equipment. Quarter bend is a 90 degree angle bend.

Reaming refers to removal of sharp edges at the end of the pipe. RMC refers to Rigid Metallic Conduit.

(49)

Program/Course: BUILDING WIRING INSTALLATION NC II Unit of Competency: PERFORM ROUGHING-IN ACTIVITIES FOR

COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT

Module Title: Performing Roughing-in Activities for

Communication and Distribution System Using Metallic Conduit

Learning Outcome 1: Layout and install electrical metallic tubing Assessment Criteria

1. PEC provisions in installing EMT are strictly followed.

2. Tools/equipment and materials needed for the installation are prepared in line with job requirements.

3. Electrical metallic tubing bends are freed from any defects according to job requirements and specifications and OHS.

4. Electrical metallic tubing is installed according to job requirements and specifications and OHS.

5. Personal Safety in installing EMT is followed.

6. Workplace is cleaned and made safe upon completion of work according to established standard.

7. Final report is prepared upon completion of job. References:

1. Azares, Efren F. and Recana, Cirilo B. Practical Electricity III; Adriana Publishing: 1999.

2. Agpaoa, Feleciano. Interior and Exterior Wiring Troubleshooting; National Bookstore: 1991.

3. Richter, Herbert P. and Schwan, Creighton W. Practical Electrical Wiring: 16th Edition.

4. Fajardo, Max P. and Fajardo, Leo B. Electrical Layout and Estimates. 5. Balana, Ulysses B. Electricity III: BEC Based.

(50)

LEARNING EXPERIENCES/ACTIVITIES

Learning Outcome 1: Layout and install electrical metallic tubing (EMT) Learning Activities Special Instructions 1. Read Information Sheet 1.1 about

the PEC provision on the

Installation of Electrical Metallic Tubing.

2. Do the Self-Check  Do not write anything on the module.

 Prepare an extra sheet of paper for your answer sheet on the Self-Check and other practice materials / sheets (e.g. Operation Sheets, Activity Sheets and Job Sheets). 3. Read Operation Sheets 1.1,1.2,1.3

about Cutting and Bending Electrical Metallic Tubing

4. Perform Operation Sheets about:  Cutting EMT

 Bending EMT

 Ask your teacher to demonstrate the steps on how to cut and bend Electrical metallic Tubing

5. Perform Job Sheet 1.1 about the installation of Electrical Metallic Tubing.

 Follow the drawing plan on the installation of Electrical metallic Tubing should follow a

measurement of +-3mm tolerance from center to center.

(51)

INFORMATION SHEET 1.1

PEC PROVISION ON ELECTRICAL METALLIC TUBING INTRODUCTION

A rigid metal conduit is a type of wiring installation which is designed to lessen or eliminate fire hazard and electrical accident. The following rules and regulations on the use of electrical metallic tubing should be observed:

A. Application

Electrical metallic tubing may be used for exposed and concealed work at the same condition with rigid metal conduit. EMT protected with enamel should not be used on the following conditions:

a. subjected to mechanical during or after the construction b. Cinder fill

c. hazardous location

d. exposure to corrosive fumes and vapor B. Sizes

Electrical metallic tubing has smooth surface inside diameter. Its standard length follows the gas pipe which is 10 ft. and a diameter from ½ inch, ¾ inch up to 6 inches.

C. Location of some corrosive fumes and vapor a. meat packing plant

b. tanneries

c. salt storage plant D. Under wet location

Electrical metallic tubing can be used provided the water is prevented in entering the conduit. The support, straps and other fitting must be approved for the purpose.

E. Number of conductors in tubing

The number of conductor for every single run of EMT should follow the given table on the next page:

(52)

Trade size of conduit in inches Size in AWG No. of conductors 3/8” 16 8 1/2" 14 8 3/4" 12 10 1” 6 12 1 ½” 2 12

(Reference: Interior and Exterior Wiring and Troubleshooting, pp. 135-136 by Feliciano Agpaoa) F. Assembly

Thread less coupling and connectors used with tubing should be tight and should be provided with waterproof type fitting if will be used in wet location. G. Types of EMT fitting (Reference: Interior and Exterior Wiring, pp. 137-138 by Feliciano Agpaoa)

Connector Coupling Adapter

Locknut Elbow Condulets

H. Type of EMT utility boxes and fitting

Utility Box Octagonal Box Clamps/Straps

I. Number of bends of EMT

The code requires a maximum of four adapter bends (360) for every one run of tubing.

(53)

J. Types of bends

The following illustrations show the different kinds of bends used in the installation of electrical metallic tubing.

Elbow bend 90 Offset bend Saddle bend

K. Personal Protective Equipment (PPE)

Goggles Helmet Gloves

(54)

SELF-CHECK 1.1

A. Direction: On your answer sheet, write the letter of your answer.

1. It is the type of metal conduit which is designed to lessen or eliminate fire hazard.

A. EMT B. RSC C. PVC D. BX

2. It is the allowable number of quarter bends which can be done in a one run of electrical metallic conduit.

A. 2 B.3 C. 4 D. 6

3. It is a type of fitting which is used to secure EMT to metallic boxes. A. connector B. condulets C. adaptor D. coupling

4. It is the size of conduit which can accommodate a maximum of 10 wires AWG # 12.

A. 3/8 B. 1/2 C. 3/4 D. 1 ¼ 5. It is the type of bend which make one quarter turn is a ______.

A. offset B. elbow C. saddle D. goose neck

B. Direction: Name the following conduit fittings.

6. 7.

8. 9.

(55)

OPERATION SHEET 1.1

CUTTING ELECTRICAL METALLIC TUBING Supplies and Materials

 Pencil  Chalk  EMT pipe

Tools and Equipment

 Metric rule  Try square  Bench vise

 Hack saw / pipe cutter

 Personal protective equipment - gloves and goggles

Procedure

1. Prepare the necessary tools, materials and personal protective equipment (PPE).

2. Wear the appropriate PPE.

3. Mark the length of EMT to be cut using the metric rules. 4. Cut the EMF using the hacksaw or pipe cutter.

Note: The action of the hacksaw is performed in forward stroke. The teeth of the hack saw must be towards the handle.

5. Observe good housekeeping. Assessment Criteria CRITERIA POINTS Workmanship 5 Measurement 4 Use of tool 3 Use of PPE 3 Speed 3 Housekeeping 2 TOTAL 20

(56)

OPERATION SHEET 1.2

BEND METALLIC TUBING (ELBOW BEND) Supplies and Materials

 Pencil  Chalk  EMT pipe

Tools and Equipment

 Hickey with handle  Hacksaw

 Metric rule  Try square

 Personal protective equipment - gloves

- goggles - safety shoes Procedure

1. Prepare the necessary tools, materials and equipment. 2. Wear the appropriate PPE.

3. Draw right angle bend on the floor using the try square.

4. Draw an arc near the corner.

(57)

6. Insert the EMT into the conduit bender / hickey where the center of the bend is to be made.

7. Bend the EMT gradually to form a 90 bend. Check the desired shape by placing the conduit on the layout which can be seen on step 3.

8. Remove the bender on the right angle bent EMT. 9. Observe good housekeeping.

Assessment Criteria CRITERIA POINTS Accuracy of bend 5 Measurement 4 Use of tool 3 Use of PPE 3 Speed 3 Housekeeping 2 TOTAL 20

(58)

OPERATION SHEET 1.3

BEND METALLIC TUBING (OFFSET BEND) Supplies and Materials

 Pencil  Chalk  EMT pipe

Tools and Equipment

 Hack saw  Metric rule  Try square

 Hickey /conduit bender

 Personal protective equipment - gloves

- goggles Procedure

1. Prepare the necessary tools, materials and equipment.

2. Wear the appropriate PPE.

3. Measure the elevation of the box where the bend is to be fitted.

4. Draw the depth of the elevation on the floor. This will make two lines.

(59)

6. Put another 200mm from your first marker.

7. Insert the hickey on the second marker and bend gradual backward stroke to follow its depth.

8. Move the hickey on the first marker and bend gradual forward stroke to follow its height.

9. Remove the hickey

10. Observe good housekeeping. Assessment Criteria CRITERIA POINTS Accuracy of bend 5 Measurement 4 Use of tool 3 Use of PPE 3 Speed 3 Housekeeping 2 TOTAL 20

(60)

JOB SHEET 1.1

INSTALL ELECTRICAL METALLIC TUBING Supplies and Materials

 Serving cap  Panel box  Utility box  Octagonal box  Panel box  Flush receptacle  Incandescent bulb  Connector (EMT)  Metal strap

Tools and Equipment

 Wiring booth  Metric rule  Try square  Bench vise

 Hack saw / pipe cutter  Level

 Plumb bob  Chalk line  Screw driver  Hammer

 Personal protective equipment - gloves

- goggles - hard hat - tight clothes

(61)

Plan / Working Drawing

Procedure

1. Prepare the necessary tools, materials and equipment. 2. Read / interpret the working drawing.

3. Wear appropriate PPE.

4. Remove knockout on metallic boxes where conduit will enter boxes.

5. Layout and measure the position of all electrical boxes based on the given working drawing.

6. Install boxes.

7. Cut conduit to desired length. 8. Ream conduit ends.

9. Make the necessary bend of the conduit.

10. Secure conduit to boxes using connector and locknuts

11. Check the horizontality and verticality of the mounted boxes. 12. Observe good housekeeping.

2 1

(62)

Assessment Criteria

The students will be evaluated based on the following: MEASUREMENT

All dimensions will be in mm center to center with a tolerance

of + - 3mm. 20 pts.

WORKMANSHIP 10 pts.

Includes bending, cutting, supporting and installing electrical metallic tubing.

 Bending 10 pts

 Cutting 10 pts.

 Supporting 10 pts.

 Horizontality and verticality 10 pts.

SPEED 10 pts.

SAFETY 10 pts.

USE OF TOOLS 10 pts.

(63)

Program/Course: BUILDING WIRING INSTALLATION NC II Unit of Competency: PERFORM ROUGHING-IN ACTIVITIES FOR

COMMUNICATION AND DISTRIBUTION SYSTEM USING METALLIC CONDUIT

Module Title: Performing Roughing-in Activities for

Communication and Distribution System Using Metallic Conduit

Learning Outcome 2: Layout and install rigid metallic tubing Assessment Criteria

1. Uses and application of rigid steel conduit are strictly followed according to the Philippine Electrical Code Standards.

2. Tools/equipments and materials needed for the installation are prepared in line with job requirements.

3. Rigid metal conduit bends are free from any defects according to established standards.

4. Rigid metal conduit is installed according to job requirements and specifications.

5. RMC support is fabricated according to job requirements. 6. Personal safety in installing RMC is followed.

7. Workplace is cleaned and made safe upon completion of job according to established standard.

8. Final report is prepared upon completion of job. References:

1. Azares, Efren F. and Recana, Cirilo B. Practical Electricity III; Adriana Publishing: 1999.

2. Agpaoa, Feleciano. Interior and Exterior Wiring Troubleshooting; National Bookstore: 1991.

3. Richter, Herbert P. and Schwan, Creighton W. Practical Electrical Wiring: 16th Edition.

4. Fajardo, Max P. and Fajardo, Leo B. Electrical Layout and Estimates. 5. Balana, Ulysses B. Electricity III: BEC Based.

(64)

LEARNING EXPERIENCES/ACTIVITIES

Learning Outcome 2: Layout and install rigid metallic tubing (RMT) Learning Activities Special Instructions 1. Read Information Sheet PEC of

installing Rigid Metal conduit

2. Do the Self-Check  Do not write anything on the module.

 Prepare an extra sheet of paper for your answer sheet on the Self-Check and other practice materials / sheets (e.g. Operation Sheets, Activity Sheets and Job Sheets). 3. Read Operation Sheet about

Reaming Rigid Metal Conduit 4. Perform Operation Sheet 2.1

reaming conduit

5. Perform Operation Sheet 2.1 about the installation of Rigid Metal Conduit

 Ask your teacher to demonstrate the proper way of reaming the end of cut RMC

6. Perform Job Sheet 1 about the installation of Rigid Metal Conduit

 Observe safety procedures in installing Rigid Metal Conduit

(65)

INFORMATION SHEET 2.1

INSTALL RIGID METALLIC CONDUIT (RMC) INTRODUCTION

A rigid metal conduit served the same purpose as with the Electrical Metallic Tubing. They are designed to protect the electrical wiring of building from electrical hazard due to faulty wiring. It is usually installed buried in concrete wall floor and ceiling, in masonry or similar materials. It is also used for exposed and concealed works, it provides maximum protection

due to mechanical damage. In order that this wiring method will become effective, safe and reliable, it is a must that it should follow the PEC standard and specifications.

PEC provisions

The Philippine Electrical Code is a set of rules and regulations which govern all electrical wiring. The following standard and specifications must be followed in installing Rigid Metal Conduit:

Standard size of RMC

Rigid metal conduit has smooth inside diameter. Its standard length follows the gas pipe which is 10 feet and a diameter from ½, ¾ , up to 6 inches.

Installation under atmospheric condition

Protected by Enamel- Conduit protected only with enamel are permitted only in indoor occupancies not subjected to severe corrosive influences.  Dissimilar metal – Contacts of metal to another metal must be avoided in

installing RMC to prevent the possibility of galvanic reaction.

Corrosion protection – Conduits fitting with corrosion protection are permitted to be installed in concrete, direct earth burial or in areas subjected to corrosive influences.

Number of conductors inside the conduit

The table on the next page shows the number of conductors permitted in a single conduit.

(66)

Maximum number of conductors allowed in trade size conduit from ½ - 3 inches. Conduit

trade size ½ ¾ 1 1 ¼ 1 ½ 2 2 ½ 3

Type letter Conductor size

TW, XHHW 14 12 10 8 9 7 5 2 15 12 9 4 25 19 15 7 44 35 26 12 60 47 36 17 99 78 60 28 142 111 85 40 171 131 62 RHW, RHH,THW 14 12 10 8 6 4 4 1 10 8 6 3 16 13 11 5 29 24 19 10 40 32 26 13 65 53 42 22 93 76 61 32 143 117 95 49 TW,THW,RHW RHH(without covering 6 4 3 2 1 1 1 1 1 2 1 1 1 1 4 3 2 2 1 7 5 4 4 3 10 7 5 5 4 16 12 10 9 6 23 17 15 13 9 36 27 23 20 14 Fittings

The following are type of conduit fittings which are usually used when wiring installation make sharp turns. The letter shows that an elbow or fitting makes right angle turn. They are:

LR LB

(67)

Bends

Rigid metal conduit can also be bent using hickey or conduit bender. It follows the same procedure bending electrical metallic tubing.

Bending RMC using hickey Hickey

Cut

Conduit is cut with hacksaw or pipe cutter. For easy and safe way of cutting, a bench vise is recommended so that pipe can be held firmly while it is being cut.

Cutting pipe using hacksaw Pipe cutter Ream

After cutting the pipe with hacksaw or pipe cutter, it leaves burrs. This must be removed to avoid damage of wire insulation when it is inserted in it. A reamer or round file can be used to remove burrs.

(68)

Threads

Since rigid metal conduit is commonly used in places where there is wet location, sealing of termination can be best done if pipe is treaded. These will prevent water from entering the conduit. The use of dies and dies stock keep the end of the pipe threaded. The sizes of dies stock ranges from ½ to 6 inches.

Dies and dies stock Tripod w\ pipe cutter Die and dies stock set

(69)

SELF-CHECK 2.1

Direction: On your answer sheet, write the letter of your answer.

1. It is a process of removing sharp edges or burrs left after cutting the pipe.

A. Reaming B. Cutting C. Bending D. Installing

2. It is a type of condulet which makes conduit run turns to the right. A. C B.LL C. LB D. LR 3. It is the tool used to thread rigid metal conduit.

A. hickey B. dies and dies stock C. reamer D. cutter

4. It is a type of condulet which has an opening at the back.

A. C B.LL C. LB D. LR 5. It is the standard length of RMC.

A. 10 ft. B. 12 ft. C. 14 ft. D. 20 ft.

Essay

Why is it important to follow PEC provisions in the use and application of rigid metal conduit wiring?

(70)

OPERATION SHEET 2.1

REAM CONDUIT

Supplies and Materials

 Pencil  Chalk

 Rag

 FMT

Tools and Equipment

 Bench vise  Hack saw

 Personal protective equipment - gloves

- goggles - hardhat Procedure

1. Prepare the necessary tools, materials, equipment and PPE in performing the activity.

2. Wear the appropriate PPE.

3. Measure and mark the location of cut. 4. Cut the conduit using hacksaw.

5. Ream the newly cut conduit using the flute reamer or file. 6. Put another 200mm from your first marker.

7. Check if the end of the pipe is smooth. 8. Have your teacher check your work.

(71)

JOB SHEET 2.1

INSTALL RIGID METAL CONDUIT Supplies and Materials

 Serving cap  Panel box  Utility box  Octagonal box  Panel box  Flush receptacle  Incandescent bulb  Connector (RMC)  Metal strap

Tools and Equipment

 Wiring booth  Wiring plan  Serving cap  Panel box  Utility box  Octagonal box  Panel box  Flush receptacle  Incandescent bulb  Connector (RMC)  Metal strap

 Personal protective equipment - gloves

- goggles - hard hat - tight clothes

(72)

Plan / Working Drawing

Procedure

1. Prepare the necessary tools, materials and equipment. 2. Read / interpret the working drawing.

3. Wear appropriate PPE.

4. Remove knockout on metallic boxes where conduit will enter boxes.

5. Layout and measure the position of all electrical boxes based on the given working drawing.

6. Install boxes.

7. Cut conduit to desired length. 8. Ream conduit ends.

9. Install the RMC by following the given work drawing. 10. Secure conduit to boxes using connector and locknuts

11. Check the horizontality and verticality of the mounted boxes. 12. Perform good housekeeping.

13. Have your teacher check your work

2

1 CB

References

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