TRANSFORMER ENCLOSURES

Non-Hazardous Locations

    • Type 1 (General purpose, Indoor use).  Type 1 provides a degree of protection to personnel against access to hazardous parts and to provide a degree of protection of the equipment inside the enclosure against ingress of solid foreign objects (falling dirt).
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    • Type 2 (Drip Proof, Indoor Use).  Same protection as Type 1 and provides a degree of protection against effects on the equipment due to the ingress of water (dripping and light splashing).
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    • Type 3 (Water and Windblown Dust, Indoor & Outdoor Use). Protection of the equipment inside the enclosure against ingress of solid foreign objects (falling dirt and windblown dust) and water (rain, sleet, snow), and from damage by the external formation of ice.
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    • Type 3R (Rainproof and Sleet/Ice Outdoor Use). Protection of the equipment inside the enclosure against ingress of solid foreign objects (falling dirt) and water (rain, sleet, snow), and from damage by the external formation of ice.
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    • Type 3S (Dust Tight, Rain Tight and Sleet/Ice Proof, Outdoor Use). Provides an additional level of protection against corrosion.
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    • Type 4 (Dust Tight, and Watertight, Indoor & Outdoor Use). Provides an additional level of protection against corrosion.
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    • Type 5 (Dust Tight, Indoor). Protection against falling dirt and settling airborne dust, lint, fibers, and flying) and provides a degree of protection to the ingress of water (dripping and light splashing).
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    • Type 6 (Temporarily Submersible, Watertight, Dust Tight, and Sleet/Ice Resistant, Indoor & Outdoor). Provides a degree of protection with respect to harmful effects on the equipment due to the ingress of water (hose-directed water and the entry of water during occasional temporary submersion at a limited depth), and from damage by external formation of ice on the enclosure.
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    • Type 6P (Prolonged Submersion, Watertight Dust Tight, and Sleet/Ice Resistant, Indoor & Outdoor). Provides a degree of protection with respect to harmful effects on the equipment due to the ingress of water (hose-directed water and the entry of water during occasional temporary submersion at a limited depth), and from damage by external formation of ice on the enclosure.
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    • Type 12 (Industrial Use [without Knockouts], Indoor Use). Protects enclosure against ingress of (falling dirt and circulating dust, lint, fibers, and flying); and to provide a degree of protection against (dripping and light splashing).
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    • Type 12K (Industrial Use [with Knockouts], Indoor Use). Enclosure built to prevent ingress of falling dirt and circulating dust, lint, fibers, and flying; and provide a degree of protection against (dripping and light splashing).
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    • Type 13 (Oil Tight and Dust Tight, Indoor). Prevents ingress of water (dripping and light splashing), and provides a degree of protection against the spraying, splashing and seepage of oil and non-corrosive coolants.

Hazardous Locations

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    •  Type 7 (Air Brake Equipment, Indoor Use).  Locations classified as Class I, Division 1, Groups A, B, C, or D as defined in NFPA 70.
    • Type 8 (Indoor & Outdoor Use). Locations classified as Class I, Division 1, Groups A, B, C, and D as defined in NFPA 70.
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    • Type 9  (Air Brake Equipment, Indoor Use). Locations classified as Class II, Division 1, Groups E, F, or G as defined in NFPA 70.
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    • Type 10 (Bureau of Mines).  Enclosure built to meet the requirements of the Mine Safety and Health Administration, 30 CFR, Part 18.
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