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Posted by RBM on September 1, 2007, 7:55 pm
The 1962 NEC was the first to require boxes to have a screw for the specific
purpose of attaching that ground conductor. Before that, the conductor was
often cut off, but usually turned back around the cable body and clamped
down by the cable clamp, which actually provided a pretty decent ground
>
>> The ground wires, if more than one, should be connected together under a
>> crimp or wire nut and attached to the metal box by turning under a
>> machine screw or by using a listed green grounding clip. What he's done
>> is incorrect
>>
>>
> Incorrect by current code, but I know it was common practice from the late
> 50's (when romex with the bare ground wire came into comon use) at least
> until the late 70's. Given how brittle old wire gets, and how seldom there
> is any usable slack in the walls, is there any good reason to try to
> re-wire old work to meet current practice? All the outlets in this place
> were wired that way when I changed them out, and I opted not to disturb
> the existing clamps beyond giving the screws a turn to make sure the
> clamps were snug. All outlets show 'green light' on the idiot meter,
> indicating a good ground. Note that the outlets were not pig-tailed, they
> were daisy-chained via the side screws (albeit with the polarity reversed
> on about half of them.)
>
> aem sends....
>
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