Installation of IMC Under Cinder Fill

The requirements for installation of Intermediate Metal Conduit (IMC) are outlined in Art. 342 of the 2011 NEC.

May 13, 2014

Intermediate Metal Conduit can be installed in or under cinder fill subject to permanent moisture _____.

a) where the conduit is not less than 18 in. under the fill
b) when protected on all sides by 2 in. of noncinder concrete
c) where protected by corrosion protection judged suitable for the condition
d) any of the above options

See answer and applicable Code reference

The correct answer is: d) any of the above options

The requirements for installation of Intermediate Metal Conduit (IMC) are outlined in Art. 342 of the 2011 NEC. As noted in Sec. 342.10(C), "IMC shall be permitted to be installed in or under cinder fill where subject to permanent moisture where protected on all sides by a layer of noncinder concrete not less than 2 in. thick; where the conduit is not less than 18 in. under the fill; or where protected by corrosion protection and judged suitable for the condition."