i'm wiring a "mother-in-law" addition to an existing house. lr,dr,br and minimal use kit. (microwave range only.)1000 sq ft. it calculates so that i can use a 100 amp sub that will be fed from a meter can/breaker combo located on the main house. the question is, can the sub be located in a walk-in closet that measures 5x11 and providing the proper working clearances are maintained? also would the sub require a main breaker. thx for any suggestions. ken m

If you dub your closet a "utility" closet (and not put anything combustable in there...) then you may...

But if you intend to use it as a clothes closet, you may not.

It appears that this addition will be attached to your house, if it is, the sub-panel does not need a main, if it is a detached building, it may need a main, see 225-31, 225-33.

As for the closet issue, depends how you feel about your mother-in-law and if the addition is attached to or well separated from your house.

Tom

thanks for the replies. it's amazing how one can read through the code book and miss the obvious. ken m