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Outside Steel Conduit Joints.

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We must maintain mechanical and electrical continuity of steel conduit, so can't use P.T.F.E tape or Loctite 55 at screwed joints to keep them watertight. Has anyone ever had water ingress at screwed conduit joints outside? 543.3.6.

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    The assumption that Locktite or tape prevents metal-metal contact is false unless the joints are not mechanically tight. The pressure between tight threads is very high, much more than is needed to break down the film or PTFE tape. This force acts hydraulically, forcing the sealant into the unloaded side of the thread, which is why they work. You may easily prove this for yourself with some plumbing and a meter, typically between a threaded item like a tap and the matching threaded socket. 

    Red lead is banned now Tom, except on ships!

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    The assumption that Locktite or tape prevents metal-metal contact is false unless the joints are not mechanically tight. The pressure between tight threads is very high, much more than is needed to break down the film or PTFE tape. This force acts hydraulically, forcing the sealant into the unloaded side of the thread, which is why they work. You may easily prove this for yourself with some plumbing and a meter, typically between a threaded item like a tap and the matching threaded socket. 

    Red lead is banned now Tom, except on ships!

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