i don't recall a definition of subpanel, methinks that's our own jargon.
that aside, there's much ado about where said 'subpanel' may be.
for instance a 'subpanel' can be withing the same structure, or in a satelitte structure
this becomes, imho, the point of definitional confusion
in the latter case,iirc, although it may be referred to as 'the barn subpanel' it will still fall under the auspices of the 'service entrance' doctrine within the nec...
~S~
So it is correct to say, it must have a single or no more then 6 means of disconnect in it. Or it must have a breaker back feeding the panel for a main.
E
it's not fair to mislead you with a yes/no here sokoservices, check out the relevant codes being forwarded, it's all very situational
safe to say, however, that adding a 'main breaker' to any
feeder isn't a code violation
(that i'm aware of) , and actually makes it all the more convienet for servicing
~S~
