[HayZee518]

The nearest I can figure is your wiring is "other than dwelling units" which fall under article 551 recreational vehicles or park vehicles. Internal wiring is in armored cable - bx if you will. all receptacles are to be gfci rated at 20 amperes. the feeder cable shall be a minimum length of 27 feet terminating in a 3 pole four wire grounding plug. I guess for a concession stand where they wire you into a panel somewhere on the grounds, you may need a three pole four wire grounding type receptacle where your equipment plugs into and the receptacle is made up into an "on grounds" panelbox or junction box.