We have a new line being added in one of our facilities. In our switch gear, we have a spare 400A breaker which we were going to use to feed power to the line. The OEM spec's state they only need a 125A feed. Which would be the better approach? Replace the 400A breaker with a 125A or feed a sub-panel with 400A service and install a 125A breaker in that panel?
Is this a matter of opinion or are there some NEC guidelines to consider?
Thanks
Is this a matter of opinion or are there some NEC guidelines to consider?
Thanks