When using metallic conduit as the ground wire, how do you confirm that the conduit provides a solid end-to-end connection?
If using an ohm meter, how would you set it up and how many ohms are acceptable?
Do inspectors check these things somehow?
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When using metallic conduit as the ground wire, how do you confirm that the conduit provides a solid end-to-end connection?
If using an ohm meter, how would you set it up and how many ohms are acceptable?
Do inspectors check these things somehow?
Best Answer
Install it properly with clean metal-metal contact.
Don't just hand-spin the conduit nuts, get a screwdriver and hammer and tighten them by putting the screwdriver on the serrations made for that purpose and tapping.
On the conduit compression fittings, tighten those with a wrench.
On setscrew fittings, tighten the setscrews with a tool.
Since metallic conduit has massively more conductivity than any size of ground wire appropriate for any circuit that will fit inside it, I don't think an ohmmeter measurement would be constructive.