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Old 11-09-2019, 04:10 PM   #1
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Canadian Electrical - Mounting Box To Wall


Hey folks, I'm looking for a little help with the CEC or OESC. I don't own a copy of either, and I want to make sure that I pass my ESA inspection next week.

What I'm looking to do is mount a device box on a wall, not in a wall. My situation is this: concrete foundation, 1x4 strapping, wood panelling. With only 3/4" between the panelling and the concrete, I need to mount the box to the outside of the panelling. If I remember correctly, the Code allows for a box to be mounted this way as long as I use a metal wall plate. Is this correct?

In case you need more information, I'm running 12/2 Romex through the joists, then vertical down the outside of the panelling (with nailing straps) into a PVC box with a 20A GFCI receptacle. I'm using the PVC box as it's fairly close to my laundry tub where the washing machine empties into.

Thank you!
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Old 11-09-2019, 04:43 PM   #2
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Re: Canadian Electrical - Mounting Box To Wall


Surface mount boxes are acceptable. It's correct that not all covers are allowed,
but not correct that metal are necessarily allowed. Either metal or plastic is ok
as long as the cover is intended for a surface mount box. The noticeable thing
between flush and surface mount covers is that flush mount will have sharp
corners (especially the stainless steel ones) while the surface mount box covers
are rounded. Google search "1110 box cover" to see the rounded types for that
type of box.
You can use either a metal or plastic box near a laundry tub but I'd use a
plastic as it's easier to get a size suitable for the GFI. If it's outside of 1.5m of
the lip of the tub, it isn't required to be GFI.
Cable above 1.5m of the floor does not need to be mechanically protected. Below
that any number of protection methods is acceptable, including stapling/strapping
it to the side of a runner board. Note that the standard staples are only rated for
1 cable.
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Old 11-09-2019, 05:27 PM   #3
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Re: Canadian Electrical - Mounting Box To Wall


Much appreciated CM
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