Page 107 - Electrician - TT (Volume 1)

ELECTRICIAN - CITS

Procedure
• Connect the megger terminals E and L to the individual phase and neutral.
• Rotate the megger handle

• By switching ON and OFF one by one , the megger should show zero and infinity reading alternatively
• If the megger shows no continuity in the ON condition of switch then particular circuit is deemed to be open
circuit.
• If the megger shows continuity in both ON and OFF position of switch, this indicate short in the particular
circuit.
Test-IV (Polarity test)
• This test is applied to know whether all switches, cut-outs are correctly installed on live terminal of supply (IER-
32(2)) and not on neutral, this test is performed.
• For example the lamp holder quite dead when the switch is in the OFF position. If the holder is wrongly
connected in the live wire directly, the operator may get severe shock in the case of repair.

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CITS : Power - Electrician & Wireman - Lesson 20-25