Hi Ralph:
Some say 0th fault to mean it is expected to fail, therefore you fault it,
before applying a single-fault.
Never heard of this process. And never used this process. And have never seen
it in a safety standard.
If bonding impedance test passes, then the circuit is not functional earthed,
it is bonded to earth…
Not in my book. The bonding circuit has constructional requirements in
addition to impedance. However, constructional requirements are often
over-looked.
Best regards,
Rich
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