UL 508A

These requirements cover industrial control panels intended for general industrial use, operating from a voltage of 600 volts or less. This equipment is intended for installation in ordinary locations, in accordance with the National Electrical Code, ANSI/NFPA 70, where the ambient temperature does not exceed 40C (104F) maximum.

These requirements also cover industrial control panel enclosures and industrial control panels intended for flame safety supervision of combustible fuel type equipment, elevator control, crane or hoist control, service equipment use, marine use, air conditioning and refrigeration equipment, and for control of industrial machinery including metalworking machine tools, power press controls, and plastic injection molding machinery.

This equipment consists of assemblies of two or more components, such as motor controllers, overload relays, fused disconnect switches, circuit breakers, and related control devices such as pushbuttons, pilot lights, selector switches, timers, control relays, and similar devices, with associated wiring, terminal blocks, and similar components.

Fire pump controllers are covered by UL 218, Standard for Fire Pump Controllers.

Equipment intended for use in hazardous locations, as defined in the National Electrical Code, ANSI/NFPA 70, are covered by UL 698, Standard for Industrial Control Equipment for Use in Hazardous (Classified) Locations.

Industrial control panels incorporating intrinsic safety barriers and intended for connection to circuits residing in hazardous locations are covered by UL 698A, Standard for Industiral Control Panels Relating to Hazardous (Classified) Locations.