>"You cannot use the neutral as a substitute for the equipment ground unless it
>is being re-used for a replacement clothes dryer, range, or oven, and even
>then, only under a specific set of conditions (NEC 250.140 if you're
>interested)."
Having a quick look at NEC 250.140, it sets forth four rules under the
exception, but I was surprised that a fifth rule does not require a single
receptacle on the branch circuit -- unless it's covered elsewhere. As written,
it seems that multiple receptacles can exist on the branch and depending on the
neutral routing through the remaining receptacles, it may not present a low
enough impedance back to the serving panel to function as a quasi-grounding
conductor for an equipment ground even if rule 2 (10 AWG Cu/8 AWG AL) is
adhered to. OTOH and as a practical matter, it's common in home installations
for ranges, cooktops and dryers to be the only device on their serving 240V
branch circuits.
Paul, W9AC
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