IMC and Dissimilar Metals

Where practicable, contact of dissimilar metals shall be avoided in an IMC raceway installation to prevent ______.

a) corrosion
b) galvanic action
c) shorts
d) none of the above

See answer and applicable Code reference

The correct answer is: b) galvanic action

Article 342 covers the use, installation, and construction specifications for intermediate metal conduit (IMC) and associated fittings. As noted in the first sentence of Sec. 342.14, "Where practicable, dissimilar metals in contact anywhere in the system shall be avoided to eliminate the possibility of galvanic action."

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