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The fitting "hub" that connects the rigid metal conduit (RMC) to this junction box is designed for this use. However, in this instance, the fitting must be suitable for a wet location. In addition, the locknut has been installed backwards. Some people use a locknut to make sure that the termination remains tight. My guess is the installer used this RMC fitting because there was no thread on the end of the conduit, which would have allowed him to thread it directly into the hub. In either case the job should have never passed inspection.
As per 344.42(A), “Threadless couplings and connectors used with conduit shall be made tight. Where buried in masonry or concrete, they shall be the concretetight type. Where installed in wet locations, they shall be the raintight type.” Also, threadless couplings and connectors shall not be used on threaded conduit ends unless listed for the purpose.
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