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Old 07-18-2013, 12:30 PM   #11
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Originally Posted by w4drr View Post

If hot and neutral are swapped, it doesn't mean ground will be hot.

Bob
??? and your logic is? at some point the neutral and ground are tied together. I am trying to pointing out that reversed polarity is dangerous for PEOPLE. I know it doesn't matter to appliances.

end of input, over to you
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Old 07-18-2013, 01:35 PM   #12
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??? and your logic is? at some point the neutral and ground are tied together. I am trying to pointing out that reversed polarity is dangerous for PEOPLE. I know it doesn't matter to appliances.

end of input, over to you
If hot and neutral are swapped at the trailer end, the black wire becomes neutral and will not have a voltage relative to ground, and the white wire becomes hot, and will have a voltage relative to ground, but there is no shock hazard unless you physically touch the white wire thinking it is neutral. In other words, only the wires going to the trailer are swapped, but hot is still hot, and neutral is still neutral and connected to ground back at the service entrance. There should be no connection between neutral and ground anywhere but at the service entrance or transformer. If the wires going to the trailer get screwed-up, such that hot and ground are swapped, then there could be a shock hazard, but only if you are standing outside on the ground and touch something metallic on the trailer that is bonded to the frame.

Bob
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Old 07-18-2013, 01:38 PM   #13
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Originally Posted by w4drr View Post
If hot and neutral are swapped at the trailer end, the black wire becomes neutral and will not have a voltage relative to ground, and the white wire becomes hot, and will have a voltage relative to ground, but there is no shock hazard unless you physically touch the white wire thinking it is neutral. In other words, only the wires going to the trailer are swapped, but hot is still hot, and neutral is still neutral and connected to ground back at the service entrance. There should be no connection between neutral and ground anywhere but at the service entrance or transformer. If the wires going to the trailer get screwed-up, such that hot and ground are swapped, then there could be a shock hazard, but only if you are standing outside on the ground and touch something metallic on the trailer that is bonded to the frame.

Bob
This could play havoc with your GFCI maybe...
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Old 07-18-2013, 01:53 PM   #14
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This could play havoc with your GFCI maybe...
GFCI's work by detecting an imbalance in current between the hot and neutral on a particular circuit. Swapped or not, this current should be equal unless some is being shunted to ground due to faulty wiring, faulty circuitry, or some unfortunate soul who just came in contact with a live circuit. But as I understand it, the ground fault detection technique really makes no distinction between which one is hot and which one is neutral, and only cares about the balance of current.

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Old 07-19-2013, 05:49 PM   #15
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All the feed back is good, but all I know for a fact is that once the surge protector monitored the reverse polarity it shut off all the power to my MH and would not make a connection again. Which is what I paid for (protection).
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Old 07-19-2013, 06:55 PM   #16
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All the feed back is good, but all I know for a fact is that once the surge protector monitored the reverse polarity it shut off all the power to my MH and would not make a connection again.
Which only says this one time and after so many hours, it finally detected what may (or not) have been a serious human safety threat. That may have existed elsewhere undetected. And that was not detected probably for hours. The point (why it tripped) is more important.

A failure without knowing why can be a prescription for future failures. Would a resulting death be an accident? This event is how you learn to avert future damage. Your post suggests an anomaly existed undetected for a long time (maybe hours).

Meanwhile, a GFCI monitors something completely different. Not voltage. It monitors current.
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Old 07-19-2013, 11:15 PM   #17
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I did find out that the camp manager had tied a pump system of some sort into that post. I dought that he's an electrician and probably didn't ground the pump system which could have led up to the problem.
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