INSTALL CONDUIT SYSTEMS

SUBCOURSE ARMY ENGINEER CENTER AND SCHOOLS CONDUIT SYSTEMS CONDUIT SYSTEMS Number EN5143 A Status Army Engineer School Leonard Wood Missouri 65473 Credit Hours Date July 1993 OVERVIEW subcourse is designed to teach the knowledge necessary to classify and size cut and thread bend install conduit and to install conductors are no prerequisites for this subcourse subcourse reflects the doctrine which was current at the time it was prepared In your own work always refer to the latest official publications otherwise stated the masculine gender of singular pronouns is used to refer to both men and LEARNING OBJECTIVE will describe the different types and sizes of conduit the methods of cutting and conduit the use of calculations and methods of making bends in conduit the installation of conduit and conductors will be given subcourse booklet EN 5143 and an ACCP examination response demonstrate competency of this task you must achieve a minimum of 70 on the examination OF CONTENTS Page Overview i Instructions iv and Certification Instructions iv 1 Classifying and Sizing Conduit 1 1 A Identifying Rigid Steel Conduit 1 2 B Identifying Electrical Metallic Tubing EMT 1 3 C Identifying Polyvinyl Chloride PVC Conduit 1 4 D Identifying Flexible Metal Conduit 1 4 Exercise 1 7 Key and Feedback 1 8 2 Cutting and Threading Conduit 2 1 A Cutting Conduit 2 2 B Threading Conduit 2 6 Exercise 2 9 Key and Feedback 2 10 3 Bending Conduit 3 1 A Methods of Bending Conduit 3 2 B Types of Bends 3 3 C Types of Benders 3 10 Exercise 3 13 Key and Feedback 3 14 4 Installing Conduit and Conductors 4.1 A Installing Conduit 4 2 B Installing Conductors 4 11 Exercise 4 15 Key and Feedback 4 16 A List of Common Acronyms A 1 B Recommended Reading List B 1 Inquiry Sheets PAGE INTENTIONALLY LEFT BLANK 1 AND SIZING CONDUIT Task 051 246 1114 DESCRIPTION this lesson you will learn to identify and describe the different types and sizes of conduit LEARNING OBJECTIVE the different types and sizes of conduit will be given subcourse booklet EN5143 and an ACCP examination response You will work at your own pace and in your own selected environment with no Complete the lesson and the practice exercise No supplementary references are needed for this lesson lesson part of the MOS 51R Skill Levels 1 and 2 course is designed to teach the knowledge to identify and describe the different types and sizes of conduit several types of conduit are used in electrical work only four types will be discussed in this rigid steel electrical metallic tubing EMT flexible and polyvinyl chloride PVC conduit is a rugged protective tube through which wires are pulled Careful planning and a certain of practice will result in a professional looking electrical system A conduit wiring system is the most challenging of the electrical systems to install A IDENTIFYING RIGID STEEL CONDUIT steel conduit is a heavy duty pipe which is threaded at each end Rigid steel conduit provides the protection from physical abuse See Figure 1 1 1 1 Rigid steel conduit comes in a variety of sizes The size is the inside diameter measurement Rigid steel conduit is in sizes from 1 2 to 6 inches These sizes will accommodate any job A breakdown of the of rigid steel conduit is shown below 1 2 1 2 1 2 full length piece or slick of rigid steel conduit is 10 feet long Galvanized steel conduit is available application in wet areas or underground Galvanizing prevents rusting of the wet conduit B IDENTIFYING ELECTRICAL METALLIC TUBING EMT is a light gauge pipe often referred to a thin wall conduit Figure 1 2 The wall thickness of EMT about 40 percent of that of rigid steel conduit 1 2 EMT conduit is available in inside diameter size ranging from 1 2 to 4 inches and in one length of 10 feet A of the size is shown below Like rigid steel EMT is also measured by the inside diameter 1 2 1 2 1 2 C IDENTIFYING POLYVINYL CHLORIDE PVC CONDUIT plastic is produced and used for below ground direct burial or concrete encasement installation conduit provides high strength low absorption rate watertight joints and low installation costs conduit comes in sizes inside diameter of 1 1 2 to 6 inches and in one length of 20 feet See 1 3 1 3 Plastic conduit conduit is available in the inside diameter sizes listed below 1 2 1 2 D IDENTIFYING FLEXIBLE METAL CONDUIT metal conduit is similar in appearance to metallic armor cable Wires however are not until the conduit is installed Flexible conduit is generally used where some type of movement vibration may be present such as wiring motors The size range of flexible metal conduit for steel aluminum is shown in Figure 1 4 1 4 Flexible conduit metallic and nonmetallic liquid tight conduit is available for use in wet areas See Figure 1 5 1 5 Liquid tight flexible conduit PAGE IS BLANK 1 EXERCISE