DIVISION OF SAMAR DISTRICT OF WRIGHT 1 WRIGHT NATIONAL HIGH SCHOOL SENIOR HIGH SCHOOL DEPARTMENT PARANAS, SAMAR ELECTRICAL INSTALLATION AND MAINTENANCE (NC II) Name of Learner: _____________________________ Grade Level: ____ Section: _____ School: _____________________________________ Date________________ LEARNER’S ACTIVITY SHEET ELECTRICAL PROTECTIVE DEVICE AND GROUNDING SYSTEM Title I. Introduction A device used to protect equipment, machinery, components and devices, in electrical circuits, against short circuit, over current and earth fault, is called as protective devices. Protective devices are necessary to protect electrical appliance or equipment against: a. Short Circuit b. Abnormal variations in the supply voltage c. Overloading of equipment d. To protect the operator against accidental contact with the faulty equipment, falling which the operator may get severe shock. II. Learning Competency Install electrical protective devices TLE-IAEII PD-III a-b Objectives: At the end of this activity, you should be able to: 1. Install the different types of electrical protective device and grounding system in residential area. Practice exercise/Activity Task 1 Procedures in Installing Safety Switch 1. Determine the exact location of installation based on the plan provided. 2. Open the desired knockout holes at the top and bottom of the safety switch. (Make sure that you wear the proper Personal Protective Equipment while doing the task.) 1 3. Mount the safety switch using a mounting screw. (Make sure that you used spirit level to leveled it horizontally and vertically) 4. Install conduit connector/adapter in each knockout hole. 5. Install the feeder wire through the conduit connector. 6. Cut wire entries at about 12 inches allowance on the line side. 7. For the line side (top of the safety switch), strip back one end of each piece of wire about 5/8 inch. 8. Insert the wire on the terminal and firmly tighten the terminals according to manufacturer’s 2 torque specifications. (Caution: Loose connection is a chief cause of electrical problems.) 9. For the load side (at the bottom of the safety switch), install wires through the conduit connector. (Note: install the wire neatly, taking care to prevent the wires from rubbing against any metal edge.) 10. Insert the wires in the terminal and firmly tighten it according to the manufacturer's torque specifications. 11. Determine the length of ground wire by measuring from the top of the box to the ground terminal. 12. Cut a piece of wire for your ground wire. 13. Strip back the lower end of the ground wire; install in the ground terminal and tighten it firmly according to manufacturer’s torque specifications. 14. Install ground wire through the bottom hole in switch housing and connect it to the ground bar. 15. Form the ground wire neatly so that it will not touch any moving part of the switch. 16. Insert the fuses into the fuse clip. (Note: fuse clips must fit tightly on each fuse). 17. Clean your work area and return the equipment tools and materials to its proper storage area. 3 Task 2 Procedures in Installing Circuit breaker 1. Determine the exact location of installation based on the plan provided. 2. Open the desired number and size of knockout holes for the conduit entry. 3. Mount panelboard in designated location. (use spirit level to leveled horizontally and vertically) 4. Connect one piece of ground wire to the ground bar. (Strip the wire from 5/8” to ¾”, the first terminal is connected to the metal part of the panelboard and the end terminal should be connected to the ground bar) (Note: under actual installation, the end of the ground wire would terminate at the grounding electrode.) 5. Install two wires through the connector of the load side. 6. Plug the circuit breakers into the panel bus, plug breakers on both right and left side, start at the top specifications. The main breaker should be placed on the upper most left side of the panel board. (Note: arrange wire neatly, allowing room for the branch-circuit conductors.) 4 7. For the line side tag or mark by numbers each group of wires that goes to a specific breaker if the wire are not color coded. Put a mark Color Coded 8. Install the wires on their respective terminals and breakers.Make sure that each wire has excess of 12 inches. (tighten the terminals snugly so that it will not create a loose connection) 9. Arrange the wires neatly and secure it with tie wires. (cut the excess of the tie wires) Note: This procedure makes it easy to trace wires, provides enough wire length to pull out and check loads with a clamp-on ammeter, and produces a neat, professional-looking good. 10. Clean work area, and return equipment, tools and materials to proper storage. Task 3 Direction: Arrange the following steps in their proper order in installing a safety switch. Use a letter to arrange the following steps: 1. Mount the safety switch. 2. Determine the exact location of the installation. 3. Install conduit connector/adapter I each knockout hole. 4. Open the desired knockout holes. 5. Install the feeder wire on the line side. 6. Clean your work area, and return equipment, tools and materials to proper storage. 7. Cut wire entries at about 12 inches allowance on the line side. 8. Cut a piece of wire for your ground wire. 9. Determine the length of ground wire by measuring from the top of the box to the ground terminal. 10. For the load side, insert the wires in the terminals and firmly tighten it according to the manufacturer's torque specifications. 5 11. For the load side, install wires through the conduit connector. 12. For the line side (top of the safety switch), strip back one end of each piece of wire about 5/8 inch. 13. For the line side, insert the wire into the terminal and tighten it. 14. Insert the fuses into the fuse clip. 15. Strip back the lower end of the ground wire; install in the ground terminal and tighten it firmly 16. Form the ground wire neatly so that it will not touch any moving part of the switch. 17. Install ground wire through the bottom hole in the switch housing and connect it to the ground bar. Task 4 Direction: Essay: Discuss the procedures in installing circuit breaker. _________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ ______________________________________________________________________________________. Task 5 Direction: Watch on How to Install GFCI Outlet on the link below. List down the procedures on how to install. Watch this on the Internet https://www.youtube.com/watch?v=TqTNJUT_lKg&feature=share _________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ _____________________________________________________________________________________. Scoring Rubrics CRITERIA 5 3 CONTENT All steps are being discussed 1 to 3 step/s is/are 4 and above steps are not being discussed not being discussed ORGANIZATION All steps are orderly arranged Some steps are not Most of the steps are orderly arranged not orderly arranged Earned Points: 6|Page 1 Reflection Complete this statement: What I have learned in this activity Prepared by: SIMEON Q. CABUEÑAS SHST-II Noted by: MERCEDES P. DACO, Ph., D. SSP-IV / SHS Asst. Principal Approved by: MIGUEL P. DABUET SSP-IV/School Principal 7
