Electrical Code…
Utilization equipment, generally other than industrial, that is normally built in standardized sizes or types and is installed or connected as a unit to perform one or more functions such as clothes washing, air-conditioning, food mixing, deep frying, and so forth.
(National Electrical Code® 100-1)
Mechanical Code…
A device that utilizes fuel or other forms of energy to produce light, heat, power, refrigeration, or air-conditioning. This definition also shall include a vented decorative appliance.
(Uniform Mechanical Code® 203.0)