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You are here: Home / Technical Info / Enclosure Material Considerations and Rating Definitions / Underwriters Laboratories Inc. (UL) Enclosure Rating Definitions

Underwriters Laboratories Inc. (UL) Enclosure Rating Definitions

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Type 1

Indoor use to provide a degree of protection against contact with the enclosed equipment and against a limited amount of falling dirt.

Type 2

Indoor use to provide a degree of protection against limited amounts of falling water and dirt.

Type 3

Indoor or outdoor use to provide a degree of protection against windblown dust, rain and sleet; undamaged by the formation of ice on the enclosure.

Type 3R

Indoor or outdoor use to provide a degree of protection against falling rain and sleet; undamaged by the formation of ice on the enclosure.

Type 3S

Indoor or outdoor use to provide a degree of protection against windblown dust, rain and sleet; external mechanisms remain operable while ice laden.

Type 4

Indoor or outdoor use to provide a degree of protection against splashing water, windblown dust and rain, and hose directed water; undamaged by the formation of ice on the enclosure.

Type 4X

Indoor or outdoor use to provide a degree of protection against splashing water, windblown dust and rain, and hose directed water; undamaged by the formation of ice on the enclosure; resists corrosion.

Type 5

Not typically used by UL.

Type 6

Indoor or outdoor use to provide a degree of protection against the entry of water during temporary submersion at a limited depth; undamaged by the formation of ice on the enclosure.

Type 6P

Indoor or outdoor use to provide a degree of protection against the entry of water during prolonged submersion at a limited depth.

Type 7

Not typically used by UL.

Type 8

Not typically used by UL.

Type 9

Not typically used by UL.

Type 10

Not typically used by UL.

Type 11

Indoor use to provide, by oil immersion, a degree of protection of the enclosed equipment against corrosive effects of corrosive liquids and gases.

Type 12

Indoor use to provide a degree of protection against dust, falling dirt and dripping non-corrosive liquids. No knockouts.

Type 12K

Indoor use to provide a degree of protection against dust, falling dirt, and dripping non-corrosive liquids. With knockouts.

Type 13

Indoor use to provide a degree of protection against dust and spraying of water, oil and noncorrosive coolants.

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