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Discussion Starter #1
Hi all, I am just curious. I have taken state license test and I remember one questions asking me about outside lighting being covered under what Nema specification in category I or II or 4. Anyone know the answer?
Thank you.

872 Posts
Well if it meant the type of enclosure the light had to be in....

EDIT: damned table looked fine when I pasted it in... (I'm cleaning it up now)

1 General-purpose.Protects against dust, light, and indirect splashing but is not dust-tight; primarily prevents contact with live parts; used indoors and under normal atmospheric conditions.

2 Drip-tight. Similar to Type 1 but with addition of drip shields; used where condensation may be severe (as in cooling rooms and laundries). 3 and 3S Weather-resistant. Protects against weather hazards such as rain and sleet; used outdoors on ship docks, in construction work, and in tunnels and subways. 3R Intended for outdoor use. Provides a degree of protection against falling rain and ice formation. Meets rod entry, rain, external icing, and rust-resistance design tests.

4 and 4X Watertight (weatherproof). Must exclude at least 65 GPM of water from 1-in. nozzle delivered from a distance not less than 10 ft for 5 min. Used outdoors on ship docks, in dairies, and in breweries.

Dust-tight. Provided with gaskets or equivalent to exclude dust; used in steel mills and cement plants.

6 and 6P
Submersible. Design depends on specified conditions of pressure and time; submersible in water; used in quarries, mines, and manholes.

Hazardous. For indoor use in Class I, Groups A, B, C, and D environments as defined in the NEC.

Hazardous. For indoor and outdoor use in locations classified as Class I, Groups A, B, C, and D as defined in the NEC.

9 Hazardous. For indoor and outdoor use in locations classified as Class II, Groups E, F, or G as defined in the NEC.

MSHA. Meets the requirements of the Mine Safety and Health Administration, 30 CFR Part 18 (1978).

11 General-purpose. Protects against the corrosive effects of liquids and gases. Meets drip and corrosion-resistance tests.

12 and 12K General-purpose. Intended for indoor use, provides some protection against dust, falling dirt, and dripping noncorrosive liquids. Meets drip, dust, and rust resistance tests.

13 General-purpose. Primarily used to provide protection against dust, spraying of water, oil, and noncorrosive coolants. Meets oil exclusion and rust resistance design tests.
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