4 wire system in single family dwellings

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Re: 4 wire system in single family dwellings

An old or new installation ??That makes the difference.3 or 4 wires.
 
Re: 4 wire system in single family dwellings

yes a new one is required to be 4 wire,but if the question was about an existing 3 wire system its grandfathered
 
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