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  Prudential Lighting   Special Applications  

Special Applications - Page 15

   

Special Applications

PRUDENTIAL LIGHTING presents a series of fluorescent fixtures which are U.L. listed as "suitable for wet location".

This wide variety of fixtures can be recessed, ceiling- or wall-mounted and are available in different sizes, lamp and ballast types and offer a choice of lens or diffusers.

In many cases, the standard fixture can be modified to fit into special or custom architectural conditions. Aluminum bodies can be specified to provide additional resistance to corrosion.

All lens and door frames are totally sealed with silicone and neoprene gasketing to prevent moisture from intruding into the fixture housing.

These specification grade fixtures are painted with a high quality White Baked Enamel paint. Other colors are available.

Maintaining a 'CLEAN AIR ATMOSPHERE" in such fields as aerospace, bioscience, pharmaceuticals, medicine, computing and food processing has created the need for CLEAN ROOM FIXTURES.

Prudential Lighting addresses this need with a series of recessed and surface luminaires designed for this purpose.

These fixtures comply with the most stringent requirements of a Class 100 clean room where the particle count does not exceed 100 parties of a size 0.5 micron or larger per cubic foot.

 

NATIONAL ELECTRIC CODE - 1990

ARTICLE 410 -  LIGHTING FIXTURES

B. FIXTURE LOCATIONS

410-4. FIXTURES IN SPECIFIC LOCATIONS

Wet and Damp Locations. Fixtures installed in wet or damp locations shall be so installed that water cannot enter or accumulate in wiring compartment,s lampholders, or other electrical parts. All fixtures installed in wet locations shall be marked, "Suitable for wet locations".

Installations underground or in concrete slabs or masonry in direct contact with the earth, and locations subject to saturation with water and other liquids, such as locations exposed to weather and unprotected, vehicle washing areas, and like locations, shall be considered to be wet locations with respect to the above requirements.

UL STANDARD FOR SAFETY FLUORESCENT LIGHTING FIXTURES UL 1570

WET LOCATIONS - GENERAL

1. The requirements under this heading are supplementary to the other applicable requirements in this standard, and apply to surface-mounted and recessed fixtures marked "Suitable for wet locations".Such fixtures are intended for installation in locations subject to rain, vehicle washing areas, locations subject to spray of a noncorrosive and nonflammable liquid, and the like.

2. These requirements do not cover fixtures for use under water (such as in a decorative fountain or swinging pool) nor in areas that contain flammable or corrosive liquids or gases.

ENCLOSURES

1. An enclosure shall be so constructed as to prevent the wetting of live parts or electrical components or wiring not inherently water proof, and to reduce the risk of electric shock due to weather exposure.

PERFORMANCE - GENERAL

1. A fixture shall be subjected to the rain test described in this section, applied to the top, sides, front, and back surfaces.

2. A recessed ceiling - mounted fixture shall be subjected to the rain and sprinkler tests.

3. A fixture found acceptable for operation on a wall or a ceiling shall be treated as both a wall - and ceiling - mounted fixture.

4. Results are acceptable after the rain, sprinkler, or immersion test if (1) there is no entrance of water that causes wetting of any lampholder, other electrical part, wiring, or conduit connection.



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