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?

1 Answer 1


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.

  • Good point on spinning the conduit nut with screwdriver+hammer. I didn't realize thats what the nut edges were for!
    – KJ7LNW
    Sep 17, 2021 at 20:41
  • I asked a similar question adding that the EMT is connected to a painted box. My interpretation of the answers was that doing that reliably requires some skill, training and experience and needs to be done purposefully.
    – jay613
    Sep 17, 2021 at 20:48
  • I run a seperate ground wire, I have seen many times where over time the condulet becomes separated and or the joints oxidize and the resistance goes up. This can become a problem with electronic controls.
    – Gil
    Sep 17, 2021 at 21:25

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