Tempco Custom Heater Manufacturing

Standard NEMA (National Electrical Manufacturers' Association) Enclosure Ratings Guide

Comparison of Indoor Rated Enclosures

Provides a degree of protection against
the following conditions: 
Type of Enclosure
1 4 4X 7 12
Incidental contact with enclosed equipment  X X X X X
Falling dirt X X X X X
Falling liquids and light splashing   X X X X
Dust, lint, and fibers   X X X X
Hosedown (hose directed water)   X X X  
Oil and coolant seepage       X X
Corrosive agents     X X  
Potentially explosive gas-air mixture        X  
Windblown dust    X X    

Comparison of Outdoor Rated Enclosures

Provides a degree of protection against
the following conditions:
Type of Enclosure
3 3R 4 4X
Incidental contact with enclosed equipment  X X X X
Rain, snow and sleet X X X X
Windblown dust X   X X
Hosedown (hose-directed water)     X X
Corrosive agents       X

 


 

  • Type 1 General Purpose Enclosures are intended for indoor use primarily to provide a degree of protection against contact with the enclosed equipment in locations where unusual service conditions do not exist.
     
  • Type 3 Weather Resistant & Windblown Dust Resistant Enclosures are intended for outdoor use primarily to provide a degree of protection against windblown dust, rain, and sleet; and to be undamaged by the formation of ice on the enclosure.
     
  • Type 3R Weather Resistant Enclosures are intended for outdoor use primarily to provide a degree of protection against falling rain and sleet, and to be undamaged by the formation of ice on the enclosure.
  • Type 4 Moisture & Windblown Dust Resistant Enclosures are intended for indoor or outdoor use primarily to provide a degree of protection against windblown dust and rain, splashing water, and hose-directed water; and to be undamaged by the formation of ice on the enclosure.
     
  • Type 4X Moisture & Corrosion Resistant Enclosures are intended for indoor or outdoor use primarily to provide a degree of protection against corrosion, windblown dust and rain, splashing water, and hose- directed water; and to be undamaged by the formation of ice on the enclosure.
  • Type 7 Explosion Resistant Enclosures are capable of withstanding the pressures resulting from an internal explosion of specified gas, and containing such an explosion sufficiently that an explosive gas-air mixture existing in the atmosphere surrounding the enclosure will not be ignited.
     
  • Type 12 Resistant to Dirt & Dripping Non-Corrosive Liquids Enclosures are intended for indoor use primarily to provide a degree of protection against dust, falling dirt, and dripping non-corrosive liquids.

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607 North Central Avenue
Wood Dale, IL 60191-1452 USA
Phone: 630.350.2252   Toll Free: 888.268.6396
Fax: 630.350.0232   Email: info@tempco.com

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Fax: 52.55.5561.6889
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