I would bet that is MC cable, we run a lot of MC, we have a job wrapping up now that has 1000's of feet of 250/4 copper MC.
I weigh 165 pounds.
I can't imagine pulling 250/4 MC cable. I get tired just thinking of it.
Looks fairly neat-ish. Seems like everytime I think, "One more support would be nice" in the end I might as well have used one-holes for conduit.
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