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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: RE: Current surge on the neutral. posted by rick_m on November 20, 2010 at 10:25:27:
The USA system, with a grounded center tap on the utility transformer, provides a neutral wire that is grounded at both the transformer and the panel, as you observed. The reason for the two grounds is that the earth in between is not generally a low impedance conductor.
Thus, when there is a line-to-neutral fault on one hot leg, there may be considerable voltage developed across the neutral wire (Ohm's law) until the breaker opens. This voltage is subtracted from the faulted hot leg, but adds to the opposite hot leg voltage.
Appliances should withstand voltage surges within reason. My neighbor's dishwasher should not have failed. However, it was new and the failure may have been something about to happen in any case.
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Follow Ups
- The ohmic drop on the neutral adds to opposite leg voltage. - Al Sekela 12:16:07 11/20/10 (1)
- RE: The ohmic drop on the neutral adds to opposite leg voltage. - rick_m 13:16:40 11/20/10 (0)
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