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Gary Maggs

Jan 1, 1970
0
I have been doing an inspection and testing course and was asked for three
reasons why you would use an rcd with a tripping current of 500 mA. I have
looked through the regs and see fire protection in Agricultural premises is
one...can anyone think of other reasons?
 
A

Andrew Gabriel

Jan 1, 1970
0
I have been doing an inspection and testing course and was asked for three
reasons why you would use an rcd with a tripping current of 500 mA. I have
looked through the regs and see fire protection in Agricultural premises is
one...can anyone think of other reasons?

I'll have a go, but don't know if these are the answers they are after...

2. Earth fault loop impedance too high to be sure fault current protective
device will operate within the required time (or even at all) on a short
circuit to earth (EEBAD).

3. Protection of an IT system against earth faults (where earth fault loop
impedance is deliberately high).
 
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