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Old 06-17-2010, 12:20 PM   #1
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Power Out


I accidentally reversed polarity when I was using my table saw and the power went out on that circuit. The circuit breaker did not trip but the power is out. Also the power went out on three other circuits without tripping the circuit breaker. The rest of my circuits are working. Any idea what happened?

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Old 06-17-2010, 12:50 PM   #2
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Maybe you tripped the master breaker on a subpanel?

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Old 06-17-2010, 02:08 PM   #3
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I don't know how you can reverse polarity on an AC circuit but I'd think a marginal wirenut or connection opened.
You may still get a voltage reading with no load on this circuit.
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Old 06-17-2010, 02:45 PM   #4
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Power Out


do you get voltage to ground on anything?
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Old 06-17-2010, 03:03 PM   #5
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Quote:
Originally Posted by Gandalf View Post
I accidentally reversed polarity when I was using my table saw and the power went out on that circuit.
You want to explain to us what this means exactly.
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Old 06-17-2010, 03:38 PM   #6
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yeah i'm confused too. with respect to A/C current, polarity doesn't matter, just phase.
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Old 06-17-2010, 04:38 PM   #7
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Does a table saw have a reverse rotation, for example to unjam with?

Perhaps he meant throwing it in reverse without waiting for it to come to a stop.

Long long time ago, if a streetcar's brakes failed, the motorman might throw it in reverse to make an emergency stop. (Also called bucking the motors)

This usually causes a tremendous power draw at least for a moment.
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Last edited by AllanJ; 06-17-2010 at 04:43 PM.
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Old 06-17-2010, 05:47 PM   #8
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Originally Posted by NitroNate View Post
yeah i'm confused too. with respect to A/C current, polarity doesn't matter, just phase.
And phase only matters if there are three

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