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Old 04-06-2012, 08:12 AM   #16
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new light switch throwing breaker


If that is truly the case, then

1) you somehow have the neutral on the load side of the switch
2) the load side of the switch is shorting out to the (grounded) box
3) There is a fault in the wiring to the fixture(s)
4) There is a fault in the fixture itself. The fault could be caused by a burned out light bulb.

Again, a picture would be a GREAT help.

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Old 04-06-2012, 08:24 AM   #17
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thanks everyone got it turns out my white wire was hot also once i switched them it worked
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Old 04-06-2012, 08:30 AM   #18
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Glad you solved it. Now that the problem is solved, I must ask a few of the respondents the following:

What are you describing when you use the term 'dead' short? If a short circuit happens to not trip an OCPD, is it referred to as a live short?
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Old 04-06-2012, 08:31 AM   #19
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A dead short is a circuit having zero resistance.
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Old 04-06-2012, 08:47 AM   #20
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Quote:
Originally Posted by Missouri Bound
A dead short is a circuit having zero resistance.
Zero resistance is impossible to achieve.
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Old 04-06-2012, 08:49 AM   #21
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Take that switch out 1 more time and wrap some black tape around that white wire so someone in the future doesn't encounter the same problem.
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Old 04-06-2012, 08:56 AM   #22
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Take that switch out 1 more time and wrap some black tape around that white wire so someone in the future doesn't encounter the same problem.
I don't think the white became hot. I think he was metering between the true switch leg and the neutral, he turned the switch on and saw 120V. Basically, what I'm saying is I think he hot and neutral to the switch. If he didn't have a neutral, the recept on the device wouldn't work.
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Old 04-06-2012, 08:57 AM   #23
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A high resistance short will stay on for awhile before tripping, a dead short trips instantly.
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Old 04-06-2012, 09:18 AM   #24
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What is an example of a high resistance short? I thought a short circuit was a closed circuit which by-passes an intended load. At the moment, I can't think of an example of a commonly occuring (or easily recognizable) high resistance short circuit.

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Old 04-06-2012, 08:51 PM   #25
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I might be dead wrong but a high resistance short is a fault in a circuit that causes the current flow to exceed the design specification.
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Old 04-06-2012, 09:09 PM   #26
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What is an example of a high resistance short? I thought a short circuit was a closed circuit which by-passes an intended load. At the moment, I can't think of an example of a commonly occuring (or easily recognizable) high resistance short circuit.
...not exactly. The load itself can be the source of the short.
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Old 04-06-2012, 09:43 PM   #27
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Originally Posted by Missouri Bound
...not exactly. The load itself can be the source of the short.
If a load "fails" then it is no longer an intended load. Accordingly it does not fit the definition of a short circuit.

If the load used in a circuit is of the incorrect resistance for the circuit size and OCP, then a mis-engineered or mis-assembled circuit exists...not a short circuit.

So, again, what is an example of a high-resistance short circuit, which is reportedly different from a "dead short"?
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Old 04-06-2012, 09:53 PM   #28
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A load consumes power, "intended" is semantics. A dead short consumes power for an instant, while a high resistance short can consume power for several seconds before tripping the overload device. A ballast winding shorting can be a high resistance short which may operate for a few seconds before tripping the overload device...same as a bare hot wire just brushing against a conduit can energize it but not trip the device. A short is a short.
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Last edited by Missouri Bound; 04-07-2012 at 11:38 AM.
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Old 04-07-2012, 08:48 AM   #29
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Quote:
Originally Posted by Missouri Bound
A short is a short.
My point exactly...no matter if it's dead, alive, immediate, or delayed.

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