National Electrical Installation Standards

Standards as High as Your Own

Thursday, September 19, 2019


I have an installation where the grounding electrode conductor enclosure consist of both rigid metal conduit and PVC.  Should each end of the rigid metal conduit (rigid 90s) be bonded. They have the threaded end where the wire exits the enclosure bonded, but not where the rigid changes to PVC.  If so, how?  I think I know, I just have a contractor that disagrees and I wanted to get your knowledgeable input to share with the contractor?




Hey Lee thanks for your question. Yes. If the rigid metal conduit (RMC) is ferrous such as steel, the end where it is connected to PVC conduit must be also bonded to the contained grounding electrode conductor as stated in 250.64(E)(1). A box could be used to make the change from RMC and PVC conduit with a bonding bushing and jumper connected to the threaded end of the RMC in the box and be connected to the grounding electrode conductor.

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