Page 105 - Electrician - TT (Volume 1)

ELECTRICIAN - CITS

Nominal Rating Minimum Test Voltage, DC Recommended Minimum
of Equipment in Volts Insulation Resistance in
Megohms
250 500 25
600 1,000 100

1,000 1,000 100
2,500 1,000 500
5,000 2,500 1,000
8,000 2,500 2,000
15,000 2,500 5,000
25,000 5,000 20,000

34,500 and above 15,000 100,000

Test-1 insulation between conductors and earth

STEPS OF TEST-I (This test is done to find out the leakage current)
1 Main fuse is taken out.
2 All other fuses are in position.
3 Main switch is in OFF position.
4 All switches are in ON position

5 All the lamps are in their positions or the holders are short-circuited.
6 Socket outlets are also shorted.
7 Line and neutral terminals are shorted on the installation side.
8 Connect the earth terminal ‘E’ of MEGGER to earth point of the system.

9 Connect the line terminal ‘L’ of MEGGER to phase point

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