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Temperature Control Panels — Enclosure Options

Tempco’sControl Panels are built using NEMA 12 manufactured enclosures. Tempco can also design and manufacture panels to other standard NEMA ratings as described below. The Standard NEMA Enclosure Definitions are listed for your convenience. Also included are comparison charts for indoor and outdoor enclosures. Include theNEMA Enclosure Rating required on your Request for Quote.
Standard: NEMA 12 — resistant to dirt, and dripping non-corrosive liquids
Type 1
general purpose 		Type 3
weather and wind blown dust resistant 		Type 3R
weather resistant 		Type 4
moisture and wind blown dust resistant 		Type 4X
moisture and corrosion resistant 		Type 7
explosion resistant

Standard NEMA (National Electrical Manufacturers’ Association) Enclosure Ratings

Type 1
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
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
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
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
Enclosures are intended for indoor or outdoor use primarily to provide a degree of protection against corrosion, windblown dust and rain, splashing water, and hosedirected water; and to be undamaged by the formation of ice on the enclosure.

Type 12
Enclosures are intended for indoor use primarily to provide a degree of protection against dust, falling dirt, and dripping noncorrosive liquids.

Type 7
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.
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

Note: CSA and IEC class enclosures are also available.