a customer asked if it would be possible( legal, nec code) to use a 1000 foot roll of 350mcm he has already on stock, to act as the branch ciruit conductors that are fed from breakers who's lugs are sized to receive a 4/0 conductor.,The breakers , ranging in size from 200-400 amps , will act as a temporary switch board while we replace , update his main switch panels with new units. This would amount to a great cost savings to him, not having to purchase 1,000 feet of 4/0 thhn,
But we would have to remove the outer ring of copper wires ( conductors) from the 350 mcm to fit into the lugs on the temporary switchboard panel breakers we've set up in an adjoining room. Is this legal under nec, are there any safety concerns, are we maintaining the proper amperage, current carrying capacity of the cables after removing enough of the individual copper strands of the 350 mcm to fit the breaker lugs which are maximum sized for 4/0 cable. Sorry this first post is so long, but we just want to do what's proper and correct practice.