connect switch handy box to plenum?

Question

would it be code to attach the 2 x 4 handy box with the switch on the plenum as the old furnace set up would hook up on the new furnace with the bx cable coming off bottom of handy box to furnace connection?
thanks for the assistance

ThreePhaseEel · Answer

As long as the box is rigidly supported and not putting load on cables, you're good to go
The basic goal of NEC 314.23 is that boxes shall not be supported in a way that puts strain on cables or wiring unless there's specific engineering (such as in a pendant drop setup) that compensates for the issue, both in the cable and the connection to the box.  So, screwing the box into the duct plenum should work, provided the result is a box that doesn't flop around in the breeze.

connect switch handy box to plenum?

One Answer

As long as the box is rigidly supported and not putting load on cables, you're good to go

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