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NEMA enclosure types

Set of standard enclosures for enclosing electrical service apparatus

Summary

Set of standard enclosures for enclosing electrical service apparatus

The National Electrical Manufacturers Association (NEMA) defines standards used in North America for various grades of electrical enclosures typically used in industrial applications. Each is rated to protect against personal access to hazardous parts, and additional type-dependent designated environmental conditions. A typical NEMA enclosure might be rated to provide protection against environmental hazards such as water, dust, oil or coolant or atmospheres containing corrosive agents such as acetylene or gasoline. A full list of NEMA enclosure types is available for download from the NEMA website.

Enclosure types

Below is a list of NEMA enclosure types; these types are further defined in NEMA 250- Enclosures for Electrical Equipment. Each type specifies characteristics of an enclosure, but not, for example, a specific enclosure size. Note that higher numbers do not include the lower-numbered tests. For example, types 3, 4 and 6 are intended for outdoor use, but type 5 is not.

A NEMA enclosure rating does not mean that it also meets the same UL enclosure rating.

NFPA is National Fire Protection Association, and NEC is National Electrical Code (U.S.A.)

NEMA TypeDefinition
1
2
3
3R
3S
3X, 3RX, 3SX
4 and 4X
5
6 and 6P
7
8
9
10
11
12 and 12K
13

References

References

  1. [https://www.nema.org/standards/view/nema-250-enclosure-types NEMA Enclosure Types (from NEMA EN P1-2021)]
  2. "Differences Between a NEMA and UL Type 4 Enclosure".
  3. [http://www.coleparmer.com/techinfo/techinfo.asp?htmlfile=NEMA_IEC.htm&ID=511 "NEMA/IEC enclosure ratings"], Cole-Parmer Technical Library
Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

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