Lighting in Demanding Conditions

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Some environments can pose difficult conditions for operating lighting systems, including damp and wet areas, corrosive environments, hazardous locations, areas that experience abnormal temperatures, areas that experience momentary power failures, and clean rooms. That means that either the light source must be able to operate properly under these conditions or the fixture must protect the light source from these conditions.

Damp And Wet Areas

If the environment exposes the lighting system to moisture condensation, then the location is a damp location. If the lighting system is exposed to direct impact by water, which will make the fixture wet, then the location is a wet location.

Fixtures for this environment must be approved for use by as required by the National Electrical Code® (NEC®), Section 410-4(a). Approval is gained by the local authority who has jurisdiction in interpreting the NEC. Damp location fixtures are specified for indoor or outdoor locations that experience dry or damp conditions only. Wet location fixtures are specified for indoor or outdoor locations that experience, dry, damp or wet conditions. Note that if a fixture installed in concrete will be in direct contact with the earth, it must be approved for use in wet locations.

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