These requirements cover household and commercial microwave cooking appliances operated in the Industrial@ Scientific and Medical (ISM) bands of 915 ??25 and 2450 ??50 MHz@ for use in ordinary locations in accordance with the National Electrical Code@ NFPA 70@ and rated not more than 600 V. These requirements also cover microwave cooking appliances intended for built-in installation@ side-by-side mounting@ stacking@ wall mounting and installation over ranges. For the purpose of these requirements@ commercial microwave cooking equipment is that usually found in commercial kitchens@ restaurants@ or other business establishments where food may be dispensed. Household microwave cooking equipment is that intended for household use. These requirements also cover the microwave cooking portion of a household electric range. The combination is to comply with the Standard for Household Electric Ranges@ UL 858.