NEMA 250-2003
Enclosures for Electrical Equipment (1000 Volts Maximum)

Standard No.

NEMA 250-2003

Release Date

2003

Published By

NEMA - National Electrical Manufacturers Association

Status

Be replaced 2014-12

Replace By

NEMA 250-2008

Latest

NEMA 250-2008

NEMA 250-2018

Scope

This standard covers enclosures for electrical equipment rated not more than 1000 Volts and intended to be installed and used as follows: a. Non-hazardous locations 1. Enclosures for indoor locations@ Types 1@ 2@ 5@ 12@ 12K@ and 13; and 2. Enclosures for indoor or outdoor locations@ Types 3@ 3X@ 3R@ 3RX@ 3S@ 3SX@ 4@ 4X@ 6@ and 6P. b. Hazardous locations 1. Enclosures for indoor locations@ Types 7 and 9; 2. Enclosures for indoor or outdoor locations@ Type 8; and 3. Enclosures for mining applications@ Type 10. Requirements for enclosures for non-hazardous locations are contained in the body of the standard. Requirements for enclosures for hazardous locations are contained in Supplement A of the standard. This standard covers the requirements to provide protection to the enclosed equipment against specific environmental conditions. This standard supplements requirements for enclosures that are contained in the individual product standards. This standard does not cover the requirements for protection of devices against conditions such as condensation@ icing@ corrosion@ or contamination which may occur within the enclosure or which may enter via conduit or unsealed openings. A product that contains features@ characteristics@ components@ materials@ or systems new or different from those in use when the standard was developed@ and that involves a risk of fire@ electric shock@ or injury to persons shall be evaluated using the appropriate additional component and end-product requirements as determined necessary to maintain the level of safety for the user of the product as originally anticipated by the intent of this standard.?

NEMA 250-2003 history

• 2014 NEMA 250-2014 Enclosures for Electrical Equipment (1000 Volts Maximum)
• 2008 NEMA 250-2008 Enclosures for Electrical Equipment (1000 Volts Maximum)
• 2003 NEMA 250-2003 Enclosures for Electrical Equipment (1000 Volts Maximum)
• 1997 NEMA 250-1997 Enclosures for Electrical Equipment (1000 Volts Maximum)
• 1991 NEMA 250-1991 Enclosures for Electrical Equipment (1000 Volts Maximum)
• 1985 NEMA 250-1985 ENCLOSURES FOR ELECTRICAL EQUIPMENT (1000 VOLTS MAXIMUM); REVISION 1 - MAY 1986@ REVISION 2 - MAY 1988
• 1979 NEMA 250-1979 Enclosures for Electrical Equipment (1000 Volts Maximum) (Revision 1: December 1980; Revision 2: October 1983)
• 0000 GOST 1908-1977