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Author Topic: Power Dist Question  (Read 2109 times)

Keith Broughton

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Re: Power Dist Question
« Reply #10 on: February 23, 2018, 11:43:34 am »

This was with a Fluke 8020a. AFAIK it's average,  but it was with all those amps pretty much full out.

I did some peak current measurements (long time back) and it's surprising how high the reading was for a fairly conservative system.
That said, average is probably more in line with how cct breakers see the load.
I don't care enough to be apathetic

Stephen Swaffer

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Re: Power Dist Question
« Reply #11 on: February 23, 2018, 01:18:17 pm »

Most circuit breakers have both a thermal and a magnetic trip mechanism.  Thermal works off the average and has a setpoint corresponding to the breaker rating-it is intended to prevent wire from overheating.

The magnetic or "instanteous" mechanism has a much higher threshold intended to protect against short circuits where milliseconds can make a significant difference in the amount of collateral damage casued by a fault.
Steve Swaffer
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