I entirely agree; testing at 100 A is a no-no.
On 2019-05-22 19:04, Richard Nute wrote:
Hi John:
The grounding circuit need only carry the maximum fault current, which
would be in the range of 13 to 20 amps. Testing at 5 times the
maximum fault current is likely to damage the circuit by itself, let
alone finding a manufacturing error.
Eyeball inspection of the grounding circuit probably is sufficient.
Best regards,
Rich
*From:*John Woodgate <[email protected]>
*Sent:* Wednesday, May 22, 2019 9:44 AM
*To:* [email protected]; [email protected]
*Subject:* Re: [PSES] GB or GC?....that is the question....
Thanks, Richard, for the true facts. However, we can look at the facts
another way. Since the test is passed, provided the fault does not get
worse, the product remains safe. It's not an ideal situation, but it
seems that something like a 100 A test would be required in order to
detect a fault of either type described.
On 2019-05-22 17:28, Richard Nute wrote:
Hi Regan and all:
As I’m sure you know by now, I subscribe to engineering
principles, not to the various safety standards. Some years ago,
I did some tests to determine the better production-line test for
the grounding circuit. I documented my findings in an article in
the Product Safety Newsletter, Volume 10, Number 2.
Neither the high-current test nor the ohmmeter (or continuity)
test are likely to find broken strands or loose connections. I
have attached my article.
Best regards,
Rich
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