Got a Siemens 60-amp switch (LNFC222R) that's for a pottery kiln. One side of the switch will have a #6 Cu NMD90 wired to it and will go to the sub-panel, running through studs, just like the 14-2 wire in the picture. The other side of the switch will be wired to the kiln.
It's in a shed. There are currently no walls and the studs are exposed.
Question:
How do I mount the switch? Supposing I want to pass an inspection, do I need to cover the wall? If I mounted the switch over a wall covering, how would the #6 Cu wire pass through the box and into the wall? Does it need protection? There is a knock out in the back of the box, but supposing I put up drywall and mount the box on top of it, I can't run the wire through the drywall because it's a combustible.
If I mount the switch between the studs, fine. Easy peasy. But say I want to finish the shed and put up drywall or cement board. I could cut a hole that the switch fits through, but the box doesn't seem to be designed to be inset (so to speak) into the wall, given the way the cover opens.
Pictures show where we want to put it.
Thanks for the help.
Danny
Best Answer
Those switches are designed for surface mount, the operator or handle needs to be open. In the US that Romex will need to be covered below 8’ not just the kiln but the existing wire to the light switch. Code allows for 1/2” sheetrock or plywood to protect the cables in the walls. I would use plywood to mount the switch especially if you will be regularly cycling the switch.
The knockout in the back of the box can be used but you will want at least a 3/4” clamp I usually use 1” clamps with #6 4 wire cables because 3/4” is really tight and some brands do not fit 3/4”. The clamp secures the wires and protects the insulation from the sharp edges of the knockout hole.