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Open neutral

by Crazyhorse2882
Tags: neutral
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Windadct
#19
Oct29-13, 04:03 PM
P: 553
The RCD will not help the case you discussed for multiple phases or split phase with broken neutral, because all of the current returns on the normal conductors ( i.e. not ground). This type of failure is not what this protection is set to do.
Averagesupernova
#20
Oct29-13, 05:11 PM
P: 2,497
Looks to me like the operation of a GFCI and an RCD is identical. However, they can be incorporated into many different devices. The most common type in the U.S. is in a receptacle. One receptacle at the beginning of the circuit can be wired to protect the rest of the circuit. The loss of a neutral between the transformer and the meter will NOT cause a GFCI incorporated into a receptacle to trip due to imbalance of current because there won't be an imbalance. The case of the GFCI built into a circuit breaker works in exactly the same way. Losing the neutral is ALWAYS bad news concerning safety as well as harming equipment. There is a good reason that the U.S. code prohibits interrupting the neutral in ALL cases. The neutral is never, ever, under any circumstance, no matter what, interrupted.


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