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NEMA Definitions
 

NEMA Data
A brief description of the more common types of enclosures used by the electrical industry relating to their environmental capabilities follows. Please refer to the appropriate sections of the latest revision of NEMA Standards Publication No. 250 for complete information regarding applications, features and design tests.

Definitions Pertaining to Non-hazardous Locations

Type 1 Enclosures
Intended for use primarily to provide a degree of protection against limited amounts of falling dirt.

Type 3 Enclosures
Intended for outdoor use primarily to provide a degree of protection against rain, sleet, windblown dust, and damage from external ice formation.

Type 3R Enclosures
Intended for outdoor use primarily to provide a degree of protection against rain, sleet, and damage from external ice formation.

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

Type 4 Enclosures
Intended for indoor or outdoor use primarily to provide a degree of protection against windblown dust and rain, splashing water, hose-directed water, and damage from external ice formation.

Type 4X Enclosures
Intended for indoor or outdoor use primarily to provide a degree of protection against corrosion, windblown dust and rain, splashing water, hose-directed water, and damage from ice formation.

Type 6 Enclosures
Intended for indoor or outdoor use primarily to provide a degree of protection against hose-directed water, the entry of water during occasional temporary submersion at a limited depth, and damage from external ice formation.

Type 6P Enclosures
Intended for indoor or outdoor use primarily to provide a degree of protection against hose-directed water, the entry of water during prolonged submersion at a limited depth, and damage from external ice formation.

Definitions Pertaining to Hazardous (Classified) Locations

Type 7 Enclosures
Intended for indoor use in locations classified as Class I, Groups A, B, C, or D, as defined in the National Electrical Code.

Type 8 Enclosures
Intended for indoor or outdoor use in locations classified as Class I, Groups A, B, C, or D, as defined in the National Electrical Code.

Type 9 Enclosures
Intended for indoor use in locations classified as Class II, Groups E, F, or G, as defined in the National Electrical Code.

Type 10 Enclosures
Constructed to meet the applicable requirements of the Mine Safety and Health Administration.

IP Data
Ingress Protection (IP), as stated by I.E.C. Standard 529, describes the degree of protection an enclosure provides. The first digit of the IP designation describes the degree of protection against access to hazardous parts and ingress of solid objects; the second digit designates the Ingress Protection against water. Please refer to the appropriate sections of IEC 529 for complete information regarding applications, features, and design tests.

Type 6 Enclosures
Intended for indoor or outdoor use primarily to provide a degree of protection against hose-directed water, the entry of water during occasional temporary submersion at a limited depth, and damage from external ice formation.

Type 6P Enclosures
Intended for indoor or outdoor use primarily to provide a degree of protection against hose-directed water, the entry of water during prolonged submersion at a limited depth, and damage from external ice formation.

Type 12 Enclosures
Intended for indoor use primarily to provide a degree of protection against circulating dust, falling dirt, and dripping non-corrosive liquids.

Type 12K Enclosures
Type 12 with knockouts.

 

Protection Against Access to Hazardous Parts (First Digit)

Number

Description

0

Non-protected

1

Protected against access with back of hand (50 mm)

2

Protected against access with jointed finger (12 mm x 80 mm)

3

Protected against access with a tool (2.5 mm)

4, 5, 6

Protected against access with a wire (1.0 mm)

   

Protection Against Ingress of Solid Foreign Objects (First Digit)

Number

Description

0

Non-protected

1

Objects equal or greater than 50mm

2

Objects equal or greater than 12.5mm

3

Objects equal or greater than 2.5mm

4

Objects equal or greater than 1mm

5

Dust protected

6

Dust tight

 

 

Protection Against Ingress of Liquids (Second Digit)

Number

Description

0

Non-protected

1

Water dripping vertically

2

Water dripping, enclosure tilted up to 15°

3

Spraying water, up to 60° angle from vertical

4

Splashing water, any direction

5

Jetting water, any direction

6

Powerful jetting water, any direction

7

Temporary immersion in water

8

Continuous immersion in water

 

 

 

NEMA No. 250 Appendix A: NEMA To IEC Enclosure Designations

The following information is provided by NEMA Standard No. 250 Appendix A as a guide to comparing NEMA enclosure types to IEC designations.

IEC Publication 529 Classification of Degrees of Protection Provided by Enclosures provides a system for specifying the enclosures of electrical equipment on the basis of the degree of protection provided by the enclosure. IEC 529 does not specify degrees of protection against mechanical damage of equipment, risk of explosions, or conditions such as moisture (produced for example by condensation), corrosive vapors, fungus, or vermin. NEMA Standards Publication 250 does test for environmental conditions such as corrosion, rust, icing, oil, and coolants. For this reason, and because the tests and evaluations for other characteristics are not identical, the IEC Enclosure Classification Designations cannot be exactly equated with NEMA Enclosure Type Numbers.

Table A-1
Conversion of NEMA Type Numbers to IEC Classification Designations (Cannot be used to convert IEC Classification Designations to NEMA Type Numbers)

NEMA Enclosure Type Number

IEC Enclosure Classification Designation

1

IP10

2

IP11

3

IP54

3R

IP14

3S

IP54

4 and 4X

IP56

5

IP52

6 and 6P

IP67

12 and 12K

IP52

13

IP54

NOTE: This comparison is based on tests specified in IEC Publication 529.

Table A-1 provides a guide for converting from NEMA Enclosure Type Numbers to IEC Enclosure Classification Designations. The NEMA Types meet or exceed the test requirements for the associated IEC Classifications; for this reason Table A-1 cannot be used to convert from IEC Classifications to NEMA Types and the NEMA to IEC conversion should be verified by test.

 

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