Page 59 - CITS - Electrician - Trade Practical

ELECTRICIAN - CITS

EXERCISE 22 : To identify protective fuse, MCB, ELCB

and testing

Objectives

At the end of this exercise you shall be able to
• identify the different types of protective fuses, MCB, ELCB and their ratings
• check the construction and parts of fuse, MCB and ELCB
• connect the fuse, MCB and test for over load & short circuit fault
• connect and test the ELCB for earth fault.

Requirements

Tools/Equipments Materials
• Combination Plier 165mm, insulated - 1 No. • Fuses - kit kat, cartridge, HRC,
• Neon tester 75mm, insulated - 1 No. glass fuse Assorted ratings - 1 No. each
• Electrician Knife Insulated - 1 No. • MCB - 1 pole, 2 pole, 3 pole,
• Screw driver 150mm, insulated - 1 No. 4 pole Assorted ratings - 1 No. each
• Multimeter Digital, 3 digit - 1 No. • ELCB - 1 Ph. 16A, 30 mA - 1 No.
1/2
• Fuse / MCB trainer kit Standard - 1 No. • Connecting wire - 1.5 sq.mm - as reqd.
• Test lamp - 60 W, 230 V - 1 No.

Procedure

TASK 1: Connect and test the Fuse
1 Identify the different types of fuses, their construction and ratings.
2 Make the connection of fuses in simple electrical circuit.
3 Connect the glass fuse in low voltage circuit.

4 Simulate the short circuit fault in the circuit and observe the fuse blowing.
5 Practice connection of HRC fuse in 3 phase circuits.

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