The photo shows a disconnected generator transfer switch and a sub-panel in an interior room on a wall that is shared with an attached garage.
The transfer switch is pre-wired with some sort of flexible metal conduit. (Greenfield? AC / armored cable? BX?) The conduit is about 1" interior diameter and 1.25" exterior.
As part of a remodel, I want to mount the transfer switch in the attached garage, so the metal conduit comes through the wall and into the subpanel. I want to mount the switch roughly opposite the subpanel.
The wall is plywood with drywall on the garage side as a fire-barrier.
May I just drill a big hole through the wall into the garage and run the metal conduit through? I would seal the edges of the hole with some fireproof caulk. Or is some sort of connector fitting required?
Best Answer
I'm no code expert but as I understand it, yes if you use fire caulk as per exception #2 in 713.3.1 and you are going to surface mount the switch on the drywall in the garage.
713.3 Fire-resistance-rated walls. Penetrations into or through fire walls, fire barriers, smoke barrier walls and fire partitions shall comply with Sections 713.3.1 through 713.3.3. Penetrations in smoke barrier walls shall also comply with Section 713.5.
http://publicecodes.cyberregs.com/icod/ibc/2009/icod_ibc_2009_7_sec013.htm
Side note: whats wrong with it where it is in the picture? Don't want it inside your house looking ugly? Also, some of those wires look a little short. You may want to cut as much of the BX as you can leaving just enough to connect it.