Hi folks,
Well, more on the interesting topic of fire enclosures,
CSA/UL 60950-1 has
4.7.2.2 Parts not requiring a fire enclosure
The following do not require a FIRE ENCLOSURE:
- motors;
- transformers;
- electromechanical components complying with 5.3.5
The question is since motors and
Hi Glyn:
You have the option of testing the bulkhead connectors in place (Annex S.1).
Apply the test flame to the inside surface of the installed connector material
at a point judged to be likely to become ignited because of its proximity to a
source of ignition. I suspect your product
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
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
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
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
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