Securing and Supporting Type FMC

The rules for securing and supporting Type FMC can be found in Sec. 348.30 of the 2011 NEC.

March 31, 2014

For flexible metal conduit, if flexibility is necessary after installation, unsecured lengths from the last point the raceway is securely fastened must not exceed _____ .

a) 3 ft for trade sizes 1/2 through 1 1/4
b) 4 ft for trade sizes 1 1/2 through 2
c) 5 ft for trade sizes 2 1/2 and larger
d) all of the above

See answer and applicable Code reference

The correct answer is: d) all of the above

The rules for securing and supporting Type FMC can be found in Sec. 348.30 of the 2011 NEC. The maximum unsecured distances based on the trade sizes shown above are noted in 348.30(A), Exception No. 2.