Q. When cutting and threading rigid metal conduit, intermediate metal conduit and stainless steel conduit in the “field”, which one of the aforementioned conduits is not required to have its threads protected with an approved electrically conductive corrosion-resistant compound?

A) Rigid metal conduit.
B) Intermediate metal conduit.
C) Stainless steel conduit.
D) None of these conduit types are required to be protected with an approved electrically conductive corrosion-resistant compound.

Answer: C

Per the exception to 300.6(A), stainless steel conduit is exempt from this requirement. All of the other conduit types listed in this example require the use of an approved electrically conductive corrosion-resistant compound.

Owen is the owner and president of National Code Seminars and the holder of master electrician certifications in 46 states. He can be reached at necexpert@aol.com.