Anybody work with with MC Cable?

Aug. 13, 2024

Anybody work with with MC Cable?

Some cities I have worked will only allow romex in wood structures under 4 stories. Not permitted in a steel building.
In any location one opts to install romex metallic materials can be be dangerous. Steel decking has sharp edges, metal studs are very sharp, etc all which can easily damage romex during and after installation.
This is where MC cable and or conduit performs better. Although you must protect both NM cable and MC cable from physical damage. MC cable is more resilient against cuts.

The definition of "Subject to physical damage" is up for interpretation.
If you install MC cable on the wall where it could be smashed with carts, mobil benches and the like. Most would consider this "subject to physical damage. Say you install it on the ceiling out of the way. This would not be subject to damage. If you could lift something and smash it, would it be subject to physical damage? Maybe if you frequently lifted equipment in that area.

EMT can not be installed where "subject to severe physical damage". Say EMT is installed in the same places as the above example. Would it be subject to severe physical damage or just physical damage? If you could hit it hard enough to smash it?
What if one could roll a heavy object across the building, one that could develop large forces. Would anything mounted on the wall be subject to Severe physical damage?
Sometimes the NEC does not have all the answerers.

Norcal is correct local building codes normally decide where romex is allowed to be installed. NEC states romex cannot be installed above a dropped or suspended ceiling in structures other than dwelling units.Some cities I have worked will only allow romex in wood structures under 4 stories. Not permitted in a steel building.In any location one opts to install romex metallic materials can be be dangerous. Steel decking has sharp edges, metal studs are very sharp, etc all which can easily damage romex during and after installation.This is where MC cable and or conduit performs better. Although you must protect both NM cable and MC cable from physical damage. MC cable is more resilient against cuts.The definition of "Subject to physical damage" is up for interpretation.If you install MC cable on the wall where it could be smashed with carts, mobil benches and the like. Most would consider this "subject to physical damage. Say you install it on the ceiling out of the way. This would not be subject to damage. If you could lift something and smash it, would it be subject to physical damage? Maybe if you frequently lifted equipment in that area.EMT can not be installed where "subject to severe physical damage". Say EMT is installed in the same places as the above example. Would it be subject to severe physical damage or just physical damage? If you could hit it hard enough to smash it?What if one could roll a heavy object across the building, one that could develop large forces. Would anything mounted on the wall be subject to Severe physical damage?Sometimes the NEC does not have all the answerers.

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Originally Posted by

I have a metal building also and I used regular 'ol romex house wire laid out horizontally on the center of the purlin and girts. For the interior walls I used 29ga prefinished Liner Panel (aka metal roofing). I cut the back off of plastic receptacle boxes and used rivets to fasten the modified boxes to the metal panels and I'd pull the wire through as I went. ....changes are pretty simple to do just back off some screws, do what ya gotta do and put it back together.

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