Posted by MarkB_MI on December 30, 2014 at 07:06:52 from (70.194.7.113):
In Reply to: Re: 3 wire 4 wire posted by Bret4207 on December 30, 2014 at 04:53:11:
The difference is when a fault occurs. What happens (in the 3-wire configuration) if the neutral is open? Now you potentially have voltage on the appliance chassis.
The NEC considers not only how things work when everything is correct, but also how they work when something is broken or miswired.
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