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Old 09-09-2017, 10:37 PM   #1
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Default Mc cable on sheet metal covered wall

Mounting a few disconnects on a sheet metal wall and running some Mc cable do I have to switch to emt on the wall? the Mc will be about 6' up. Using one 20 amp circuit for per two pump motors less than 5 amps each. Feed two disconnects and fuse down for each motor. Won't be any water in this room just piping across the floor to pumps

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Old 09-10-2017, 12:02 AM   #2
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It depends if you feel the MC needs protection from damage.

You can always sleeve it in EMT if you feel it needs protection.
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Old 09-10-2017, 03:15 AM   #3
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In the few instances like this... I'd spread out the fastening load by way of shallow strut.

I don't trust sheet metal to really hold that many pounds per fastener.
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Old 09-10-2017, 07:22 AM   #4
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Quote:
Originally Posted by rrolleston View Post
Mounting a few disconnects on a sheet metal wall and running some Mc cable do I have to switch to emt on the wall? the Mc will be about 6' up. Using one 20 amp circuit for per two pump motors less than 5 amps each. Feed two disconnects and fuse down for each motor. Won't be any water in this room just piping across the floor to pumps

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What wiring method will you be using from the disconnect to the motors?
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Old 09-10-2017, 07:29 AM   #5
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It depends if you feel the MC needs protection from damage.
I think that's why he is asking.

I try to think what I would use romex for in a residential application and if didn't think that was safe or nice looking, I would use that same application for MC.
For me, I dont think MC is something I like to see exposed below ceiling level.
If the OP is using carflex or greenfield to connect the motors, I would suggest he use it for the line side and terminating that in a 1900 box higher up above the sheet metal.

$20 worth of material would look 20 times better.
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Old 09-10-2017, 07:39 AM   #6
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I think that's why he is asking.

I try to think what I would use romex for in a residential application and if didn't think that was safe or nice looking, I would use that same application for MC.
For me, I dont think MC is something I like to see exposed below ceiling level.
If the OP is using carflex or greenfield to connect the motors, I would suggest he use it for the line side and terminating that in a 1900 box higher up above the sheet metal.

$20 worth of material would look 20 times better.
If that is his question we need way more details.
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Old 09-10-2017, 08:05 AM   #7
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The sheet metal is on something, furring strips or studs or whatever, it might be easier and quicker to just find the studs, slap a piece of strut on vertical, and do it in conduit, rather than try to make the MC come out decent.
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