Testing RCDs with your PAT - What happens if the RCD doesn't trip?

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Testing RCDs with your PAT - What happens if the RCD doesn't trip?

Post by Admin on Wed Nov 07, 2018 6:19 pm

Quite apart from the obvious, your RCD (Residual Current Device) under test may not trip for possibly a couple of reasons.

(1) the RCD is faulty and out of its operating range or

(2) an RCD upline may have tripped instead.

If the RCD is faulty, you should have it replaced. However, advise your client that RCDs should be tested regularly by pressing the test button on the front of the RCD when supplied from the mains.

The PAT will apply a test current above the rated current (10mA, 30mA) for a duration long enough to meeting AS3760 testing criteria. If the RCD doesn't trip it may mean components within the PAT are subject to heating and this may damage the pat. Therefore, stop the test if the RCD hasn't tripped after about 6 seconds.

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