If I have an Electrical Room with Two MCC's Face to Face both rated 800 amps. I have a working distance of 4' between them. I also have an aisle way per say around the ends of the equipment. The width of this aisle way is 30" on either end between the MCC and the wall. Is 30" sufficient or by code does this need to be larger say 36". If you can please site where I can find this in the code.