防爆外殼(NEMA VS IP)

NEMA Types – Definitions Pertaining to Nonhazardous Locations


Enclosures for Electrical Equipment

An enclosure is a surrounding case constructed to provide protection from accidental contact with the enclosed equipment and to provide protection to the enclosed equipment from specified environmental conditions. A brief description of the more common types of enclosures used by the electrical industry follows.

Type 1 Enclosure: Intended for indoor use primarily to provide protection against contact with enclosed equipment.

Type 2 Enclosure: Intended for indoor use primarily to provide a degree of protection against limited amounts of falling water and dirt.

Type 3 Enclosure: Intended for outdoor use primarily to provide a degree of protection against wind-blown dust, rain, sleet and external ice formation.

Type 3R Enclosure: Intended for outdoor use primarily to provide a degree of protection against falling rain, sleet and external ice formation.

Type 3S Enclosure: Intended for outdoor use primarily to provide a degree of protection against windblown dust, rain, and sleet, and to provide for operation of external mechanism when ice laden.

Type 3X Enclosure: Intended for outdoor use primarily to provide a degree of protection against corrosion, wind-blown dust, rain, sleet and external ice formation.

Type 3SX Enclosure: Intended for outdoor use primarily to provide a degree of protection against corrosion, wind-blown dust, rain, and sleet, and to provide for operation of external mechanism when ice laden.

Type 4 Enclosure: Intended for indoor or outdoor use primarily to provide a degree of protection against wind-blown dust and rain, splashing water and hose-directed water.

Type 4X Enclosure: Intended for indoor or outdoor use primarily to provide a degree of protection against corrosion, wind-blown dust and rain, splashing water and hose-directed water.

Type 6 Enclosure: Intended for indoor or outdoor use primarily to avoid a degree of protection against contact with enclosed equipment, falling dirt, hose-directed water, entry of water during occasional temporary submersion at a limited depth and external ice formation.

Type 6P Enclosure: Intended for indoor or outdoor use primarily to provide a degree of protection against contact with enclosed equipment, falling dirt, hose-directed water, entry of water during prolonged submersion at a limited depth and external ice formation.

Type 12 Enclosure: Intended for indoor use primarily to provide a degree of protection against dust, falling dirt and dripping noncorrosive liquids.

Type 13 Enclosure: Intended for indoor use primarily to provide a degree of protection against dust, spraying of water, oil and noncorrosive coolant.



IP (Ingress Protection) Rating for Equipment and Enclosures


A two-digit number (as specified in Australian Standards AS60529 and EN60529) is used to provide an IP Rating to a piece of electronic equipment or to an enclosure for electronic equipment.

The two digits represent three different forms of environmental influence:

The first digit represents protection against ingress of solid objects

The second digit represents protection against ingress of liquids

The larger the value of each digit, the greater the protection from that influence. As an example, a product rated as IP57 would be better protected against environmental factors than another similar product that was only rated as IP43. Our Gel Connectors are rated at IP67 (totally protected against dust ingress and withstands immersion up to a depth of 1 metre).

Value   First Digit                                  Second Digit
            Protection against ingress          Protection against ingress
           of solids                                    of liquids


0         No protection                           No protection
1         Protected against solid              Protected against vertically
           objects over 50mm e.g.            falling drops of water.
           hands, large tools
2          Protected against solid objects over        Protected against direct sprays of water up to 15°     
            12mm e.g. hands, large tools                   from vertical.

3          Protected against solid objects over        Protected against direct sprays of water up to 60°
            2.5mm e.g. wire, small tools                    from vertical.

4          Protected against solid objects over        Protected against water sprayed from any direction.
            1.0mm e.g. wires                                    Limited ingress permitted.

5          Limited protection against dust ingress    Protected against low pressure water jets from any 
            (no harmful deposit)                               direction. Limited ingress permitted.

6         Totally protected against dust ingress.      Protected against high pressure water jets from any
                                                                         direction. Limited ingress permitted.
7         -                                                             Protected against immersion between 15cm and 1M.
8         -                                                             Protected against long periods of immersion under pressure.
9         -                                                             -