  Find the Answer   Plumbing fittings can’t be used for
electrical installations. You must use electrical conduit for
this type of installation. A lack of locknuts on the outside and
inside of this installation presents a bonding problem.  The
following 2005 NEC rules are just a few that can be cited for
this installation:  Per 300.10, “Metal raceways, cable armor,
and other metal enclosures for conductors shall be metallically
joined together into a continuous electric conductor and shall
be connected to all boxes, fittings, and cabinets so as to
provide effective electrical continuity. Unless specifically
permitted elsewhere in this Code, raceways and cable assemblies
shall be mechanically secured to boxes, fittings, cabinets, and
othe enclosures.”   Per 250.4(A)(3), “Non–current-carrying
conductive materials enclosing electrical conductors or
equipment, or forming part of such equipment, shall be connected
together and to the electrical supply source in a manner that
establishes an effective ground-fault c