342 – Intermediate Metal Conduit: Type IMC

342.10(E) – Intermediate Metal Conduit (Type IMC)

Change at a Glance:

New sub-section (E) clarifies that intermediate metal conduit (Type IMC) is permitted to be installed where subject to severe physical damage.

342.10 Uses Permitted. (Intermediate Metal Conduit: Type IMC)

(E) Severe Physical Damage. IMC shall be permitted to be installed where subject to severe physical damage.

342.14 – Type IMC with Dissimilar Metals

Change at a Glance:

Revision added to make it clear that stainless steel fittings and enclosures can be used with galvanized steel IMC, but galvanized fittings should not be used with stainless steel IMC.

342.14 Dissimilar Metals.

Where practicable, dissimilar metals in contact anywhere in the system shall be avoided to eliminate the possibility of galvanic action. Stainless steel and aluminum fittings and enclosures shall be permitted to be used with galvanized steel IMC where not subject to severe corrosive influences. Stainless steel IMC shall only be used with the following:
(1) Stainless steel fittings
(2) Stainless steel outlet boxes and enclosures
(3) Steel (galvanized, painted, powder or PVC coated, and so forth) boxes and enclosures when not subject to severe corrosive influences
(4) Stainless steel, nonmetallic, or approved accessories