Practical Significance
Properly installed electrical wiring provides long service, less maintenance and safety.
Therefore, it is necessary to perform wiring practice.
Competency and Practical Skills
This practical is expected to develop the following skills for the industry identified competency: ‘Plan wiring/cabling activities using relevant materials following safe practices’
i. Wire up the circuit.
ii. Perform various types of wiring systems.
iii. Fix electrical accessories.
iv. Test wiring circuit.
Practical Outcome
1. Prepare godown wiring and test it.
Relevant Affective domain related Outcome(s)
i. Practice good housekeeping with safety measures.
ii. Demonstrate working as a leader/a team member.
iii. Maintain tools and equipment.
iv. Follow ethical practices.
Minimum Theoretical Background
Godown is a big hall having numbers of compartments. Fig. 1 shows the three compartment godown having three lamps in each compartment, which are to be controlled such that as a person moves from one compartment to other in either direction the switch ON one lamp after the other and lamp switch ON earlier is switched off. Such an arrangement is called as godown wiring.
In godown wiring one single pole switch at entrance is required. The two way switches required are number of compartment minus one.
Practical set-up / Circuit diagram / Work Situation
Resources Required
Precautions to be Followed
1 Mark layout on wiring board before fixing conduit.
2 Make sure all connection should be tight.
Procedure
1. Mark the layout on the wiring board.
2. Cut the PVC pipes as per the layout.
3. Fix the saddles as per the layout and installation plan. (For this work fix the saddle at a distance of 75 mm from the center of the block and conduit accessories. Fix only one side of the saddle initially. The other side is to be fixed while laying the conduit).
4. Fix the conduits and accessories on the wiring board with the help of saddles as per the plan.
5. Cut the cables according to the route and bunch them (Leave the excess length of 200 to 300 mm in each cable for termination).
6. Insert the required cables in the appropriate pipes and accessories as per layout and push the wires to the other end of the pipes.
7. Take the modular boxes. Place them at the conduit ends and mark the external diameter of the conduit pipe on the surface.
8. Cut the upper side of modular box by Hacksaw and remove the portion from it.
9. Prepare round hole for conduit. Check the fitting of the conduit pipe in the hole at intervals till a correct fitting is made.
10. Position the accessories on the top cover of modular box close the open holes with strips (if any).
11. Prepare the end termination of the cables as per the wiring diagram.
12. Insert the lamp cables through the cable entry holes of junction box.
13. Terminate the cables in the batten holders and fix them.
14. Terminate the cables of the switches in the switch, and fix them.
15. Fix the boxes of the switches with wood screw on the wiring board.
16. Connect the supply wires in the supply terminals available.
17. Test the circuit after approval by the teacher.