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In Reply to: RE: Wiring outlet box posted by jea48 on April 14, 2017 at 12:32:16
No clue, which is why I decided that post about it here. You've confirmed my suspicions, in any case. Thanks,
Licensed master electrician since 1986, the box needs to be grounded. Even when using grounding type receptacles it's still a good idea. As for the conduit being the ground for the box, that's only acceptable if certain criteria are met, such as all connectors and couplings shall be of the set screw type, if FMC (flexible metal conduit) (or greenfield as its often called) it must have the integral copper bond wire and can't be run more than 6' in length. If the knock outs are concentric all must be removed or even the set screw connector isn't considered a sufficient bond.
In the pictures above the one to the right would still need the box bonded by the ground wire, the conduit is connected with a compression connector, this is not considered a good enough bond.
In any event, there's absolutely no reason not to bond the box other than laziness.
Why not just use a plastic j-box, and all the grounding issues go away? :)
Plastic boxes are great, use them all the time, but there are some instances where it's just not feasible. Without seeing the installation it can only be surmised the electrician used a metal box for a reason.
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