Limitations on Installing Wiring in Ducts

No wiring of any type shall be installed in ducts used to transport _____.

a) dust
b) flammable vapors
c) loose stock
d) all of the above

See answer and applicable Code reference

The correct answer is: d) all of the above

The requirements for installing wiring in ducts not used for air handling are listed in Sec. 300.22 of the 2011 NEC. As noted in 300.22(A), "No wiring systems of any type shall be installed in ducts used to transport

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