UL 508A:2003 pdf download Industrial Control Panels
1 Scope
1,1 These requirements cover industrial control panels intended for general industrial use, operating froma voltage of 600 volts or less. This equipment is intended for installation in ordinary locations, inaccordance with the National Electrical Code, ANSI/NFPA 70. where the ambient temperature does notexceed 40°C(104F) maximum.
1.1 effective April 25, 2003
1.2 These requirements also cover industrial control panel enclosures and industrial control panelsintended for flame safety supervision of combustible fuel type equipment, elevator control, crane or hoistcontrol, service equipment use, marine use, air conditioning and refrigeration equipment, and for controof industrial machinery including metalworking machine tools, power press controls, and plastic injectionmolding machinery.
1.2 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 aspushbuttons, pilot lights, selector switches, timers, control relays, and similar devices, with associatedwiring, terminal blocks, and similar components.
1.3 effective April 25, 2003
1.4 Fire pump controllers are covered by UL 218, Standard for Fire Pump Controllers.1.4 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 effective April 25. 2003
1.6 Industrial control panels incorporating intrinsic safety barriers and intended for connection to circuitsresiding in hazardous locations are covered by UL 698A, Standard for industiral Control Panels Relatingto Hazardous (Classified) Locations
1.6 effective April 25.2003
1.7 A product that contains features, characteristics, components, materials, or systems new or differentfrom those covered by the requirements in this standard, and that involves a risk of fire or of electric shockor injury to persons shall be evaluated using appropriate additional component and end-productrequirements to maintain the level of safety as originally anticipated by the intent of this standard. Aproduct whose features, characteristics, components, materials,or systems conflict with specificrequirements or provisions of this standard does not comply with this standard. Revision of requirementsshall be proposed and adopted in conformance with the methods emploved for development, revision, andimplementation of this standard.
2 Glossary
2.1 For the purpose of this standard, the following definitions apply.
2.1 effective April 25,2003
2.2 APPLIANCE – A piece of utilization equipment that incorporates both controls and loads.2.2 effective April 25，2003
2.3 BRANCH CIRCUIT – The conductors and components following the last overcurrent protectivedevice protecting a load.
2.3 effective April 25, 2003
2.4 BRANCH CIRCUIT PROTECTION – Overcurrent protection with an ampere rating selected toprotect the branch circuit. For a motor branch circuit, the overcurrent protection is required forovercurrents due to short circuits and faults to ground only, see 2.5 and 2.23 and 2.28. For motoroverload protection, see 2.36.
2.4 effective April 25, 2003
2.5 BRANCH CIRCUIT PROTECTIVE DEVICE – A fuse or circuit breaker that has been evaluated to asafety standard for providing overcurrent protection. See 2.22 and 2.29.
2.5 effective April 25, 2003
2.6 CLASS 1 CIRCUIT – A control circuit on the load side of overcurrent protective device where thevoltage does not exceed 600 volts, and where the power available is not limited, or control circuit on theload side of power limiting supply, such as a transformer.
2.6 effective April 25.2003
2.7 CLASS 1 WIRING – Conductors of a Class 1 Circuit.
2.7 effective April 25, 2003
2.8 CLASS 2 CIRCUIT – A control circuit supplied from a source having limited voltage (30 Vrms oress) and current capacity, such as from the secondary of a Class 2 transformer, and rated for use withClass 2 remote-control or signaling circuits.
2.8 effective April 25,2003
UL 508A:2003 pdf download
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