Illumination – Light source and modifier – Including reflector
Patent
1988-06-09
1990-06-26
Husar, Stephen F.
Illumination
Light source and modifier
Including reflector
362264, 362294, 362295, 362276, 362373, F21V 2500
Patent
active
049377175
ABSTRACT:
Conduits having the electric wiring for supplying power to lighting fixtures in an area classified as hazardous by reason of the presence of potentially explosive dust, vapor or gas have unobstructed interior passages for conveying nonexplosive gas under pressure from outside the hazardous area to each fixture. The pressure of gas in the conduit network can be monitored automatically and control mechanism can be provided to shut off the supply of electric power to the fixtures if the pressure falls below a predetermined pressure or a dangerous over-pressure condition occurs. At each fixture, the nonexplosive gas can be discharged along the face of the transparent fixture lens and/or along an exterior surface of the fixture housing to prevent build-up of potentially explosive agents and to cool the housing.
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Crouse-Hinds 1987 Code Digest.
NFPA 196 "Standard for Purged and Pressurized Enclosures for Electrical Equipment", 1986 Edition.
Appleton NEC 1987 Code Review.
Wide-Lite Hostile Environment Lighting Guide, no date.
Beach Robert W.
Brown Ward
Hagarman Sue
Husar Stephen F.
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