Check out 220-36 of the 2002 NEC - it sounds as though you may qualify as a "new" restaurant and will be able to use this shorter calculation. You will have to determine the total connected load - including heating + cooling - that's everything using electricity - add all new equipment with nameplate ratings and go to the table to find your demand factor. This eliminates the use of part II of section 220 which could cause you grief. I would add a few amps for that unforseen appliance that they didn't tell you about. Good Luck
