UL 508A

1 Scope
1.1 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 40°C (104°F) maximum.

1.1 revised effective April 25, 2003
1.2 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.

1.2 revised effective April 25, 2003
1.3 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.

1.3 revised effective April 25, 2003
1.4 Fire pump controllers are covered by UL 218, Standard for Fire Pump Controllers.

1.4 revised effective April 25, 2003
1.5 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.

1.5 revised effective April 25, 2003
1.6 Industrial control panels incorporating intrinsic safety barriers and intended for connection to circuits residing in hazardous locations are covered by UL 698A, Standard for Industrial Control Panels Relating to Hazardous (Classified) Locations.

1.6 revised effective April 25, 2003
1.7 A product that contains features, characteristics, components, materials, or systems new or different from those covered by the requirements in this standard, and that involves a risk of fire or of electric shock or injury to persons shall be evaluated using appropriate additional component and end-product requirements to maintain the level of safety as originally anticipated by the intent of this standard. A product whose features, characteristics, components, materials, or systems conflict with specific requirements or provisions of this standard does not comply with this standard. Revision of requirements shall be proposed and adopted in conformance with the methods employed for development, revision, and implementation of this standard.

1.7 revised effective April 25, 2003

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