Short circuit computation

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ENKEI's picture
Joined: 2016-10-12

Good day, guys! I need to know the proper AIC rating of circuit breakers for homes, so I've read about calculating short circuit current. Now, I'm confused.

One says use Ohm's Law.

Isc = Volts / (internal resistance of breaker + wire resistance)

I got around 5,000 amps.

And one uses the point-to-point method. This one yields a lower value, about 2,000 amps.

We have 230V, 60 Hz, single-phase service.

Any help understanding this would be much appreciated. Thanks!

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