• NEMA 250 : 2014

    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

    ENCLOSURES FOR ELECTRICAL EQUIPMENT (1000 VOLTS MAXIMUM)

    Available format(s): 

    Superseded date:  17-02-2020

    Language(s): 

    Published date:  06-12-2012

    Publisher:  National Electrical Manufacturers Association

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    Table of Contents - (Show below) - (Hide below)

    1 GENERAL
    2 ENCLOSURE TYPES, FEATURES, AND APPLICATIONS
    3 CONSTRUCTION
    4 MARKING 15
    5 DESIGN TESTS
    Annex A - Comparison Between NEMA Enclosure
              Type Numbers and ANSI/IEC Enclosure
              Classification Designations
    Annex B - Descriptions, Applications, Features, and
              Test Criteria of Enclosures for Hazardous
              (Classified) Locations

    Abstract - (Show below) - (Hide below)

    Describes the requirements to provide protection to the enclosed equipment against specific environmental conditions.

    General Product Information - (Show below) - (Hide below)

    Document Type Standard
    Publisher National Electrical Manufacturers Association
    Status Superseded
    Superseded By

    Standards Referenced By This Book - (Show below) - (Hide below)

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    API 670 : 2014 MACHINERY PROTECTION SYSTEMS
    EN ISO 13631:2002 Petroleum and natural gas industries - Packaged reciprocating gas compressors (ISO 13631:2002)
    A-A-50304 Base Document:1987 DYNAMOMETER, ENGINE RUN-IN, 500 HORSEPOWER CAPACITY
    MIL-PRF-32098 Revision A:2004 ULTRAFILTRATION SYSTEM, 10-GALLON PER MINUTE OILY WASTE MEMBRANE (OWMS-10)
    ASME A17.1 : 2016 SAFETY CODE FOR ELEVATORS AND ESCALATORS - INCLUDES REQUIREMENTS FOR ELEVATORS, ESCALATORS, DUMBWAITERS, MOVING WALKS, MATERIAL LIFTS, AND DUMBWAITERS WITH AUTOMATIC TRANSFER DEVICES
    MIL-PRF-30099 Revision A:2011 TREATMENT SYSTEM, BLACKWATER AND COMBINED BLACKWATER/GRAYWATER, FOR SURFACE SHIPS
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    MIL-PRF-32007 Base Document:2003 OILY WASTEWATER SEPARATION SYSTEM, 6.7-GALLON PER MINUTE NAVY INTEGRATED MEMBRANE SYSTEM (NIMS)
    IEEE 1585 : 2002 FUNCTIONAL SPECIFICATION OF MEDIUM VOLTAGE (1-35 KV) ELECTRONIC SERIES DEVICES FOR COMPENSATION OF VOLTAGE FLUCTUATIONS
    ANSI/AWWA D107-16 ERR 1(CSV) COMPOSITE ELEVATED TANKS FOR WATER STORAGE
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    EN 62026-3:2015 Low-voltage switchgear and controlgear - Controller-device interfaces (CDIs) - Part 3: DeviceNet
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    API 682 CHINESE : 2014 PUMPS - SHAFT SEALING SYSTEMS FOR CENTRIFUGAL AND ROTARY PUMPS
    API 14F : 2008 : R2013 DESIGN, INSTALLATION, AND MAINTENANCE OF ELECTRICAL SYSTEMS FOR FIXED AND FLOATING OFFSHORE PETROLEUM FACILITIES FOR UNCLASSIFIED AND CLASS 1, DIVISION 1 AND DIVISION 2 LOCATIONS
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    IEEE/ANSI N42.38-2015 American National Standard for Performance Criteria for Spectroscopy-Based Portal Monitors Used in Homeland Security
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    EN 62040-1:2008/A1:2013 UNINTERRUPTIBLE POWER SYSTEMS (UPS) - PART 1: GENERAL AND SAFETY REQUIREMENTS FOR UPS (IEC 62040-1:2008/A1:2013)
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    UNI EN ISO 23553-1 : 2014 SAFETY AND CONTROL DEVICES FOR OIL BURNERS AND OIL-BURNING APPLIANCES - PARTICULAR REQUIREMENTS - PART 1: AUTOMATIC AND SEMI-AUTOMATIC VALVES
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    A-A-59186 Base Document:1998 WELL, HOT FOOD STORAGE, ELECTRIC (NAVAL SHIPBOARD)
    MIL-M-29190 Revision A:1986 MONITORING DEVICES, EMISSION, STACK RELATED
    A-A-59777 Revision A:2009 DRY FILTER UNIT
    ASTM F 1837M : 1997 : R2002 Standard Specification for Heat-Shrink Cable Entry Seals (Metric)
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    NEMA ICS 4:2015 Application Guideline for Terminal Blocks
    ASTM E 2513 : 2007 : R2012 Standard Specification for Multi-Story Building External Evacuation Platform Rescue Systems
    NEMA ICS 20:2009 (R2015) Informational Guide to Electrical Industrial Topics
    UFC 3-430-11 : 2001 UNIFIED FACILITIES CRITERIA - BOILER CONTROL SYSTEMS
    ASTM F 2363/F2363M : 2017 : REDLINE Standard Specification for Sewage and Graywater Flow Through Treatment Systems
    ISO 13631:2002 Petroleum and natural gas industries Packaged reciprocating gas compressors
    NEMA KS 3:2010 Guidelines for Inspection and Preventive Maintenance of Switches Used in Commercial and Industrial Applications
    PD IEC/TR 61439-0:2013 Low-voltage switchgear and controlgear assemblies Guidance to specifying assemblies
    ANSI C12.7-2014 American National Standard for Requirements for Watthour Meter Sockets
    NEMA ICS 61800-2:2005 Adjustable Speed Electrical Power Drive Systems, Part 2: General Requirements—Rating Specifications for Low Voltage Adjustable Frequency AC Power Drive Systems
    B354.9-17 Design, calculations, safety requirements, and test methods for mast climbing work platforms (MCWPs)
    NEMA SM 24-1991 (R1997, R2002) LAND BASED STEAM TURBINE GENERATOR SETS 0 TO 33,000 kW
    NEMA PB 1:2011 Panelboards
    NEMA KS 1:2013 Heavy Duty Enclosed and Dead-Front Switches (600 Volts Maximum)
    NEMA ICS 18:2001 (R2007) INDUSTRIAL CONTROL AND SYSTEMS: MOTOR CONTROL CENTERS
    IEEE 1623-2004 IEEE Guide for the Functional Specification of Medium Voltage (1 kV - 35 kV) Electronic Shunt Devices for Dynamic Voltage Compensation
    ISO 21049:2004 Pumps Shaft sealing systems for centrifugal and rotary pumps
    ASTM F 2072 : 2014 : REDLINE Standard Test Method for Hosedown of a Membrane Switch
    ASTM F 1837M : 1997 Standard Specification for Heat-Shrink Cable Entry Seals (Metric)
    C9-17 Dry-type transformers
    ASTM F 1895 : 2014 : REDLINE Standard Test Method for Submersion of a Membrane Switch
    NEMA ICS 3:2005 (R2010) INDUSTRIAL CONTROL AND SYSTEMS: MEDIUM VOLTAGE CONTROLLERS RATED 2001 TO 7200 VOLTS AC
    ASTM E 2484 : 2008 Standard Specification for Multi-Story Building External Evacuation Controlled Descent Devices
    IEEE C37.21-2005 IEEE Standard for Control Switchboards
    API 552 : 1994 TRANSMISSION SYSTEMS
    ANSI C93.4 : 2012 REQUIREMENTS FOR LINE TUNING UNITS
    ASTM E 3137/E3137M : 2017 Standard Specification for Heat Meter Instrumentation
    NEMA ST 20:2014 Dry Type Transformers for General Applications
    IEC TR 61439-0:2013 Low-voltage switchgear and controlgear assemblies - Part 0: Guidance to specifying assemblies
    NEMA ICS 7.2 : 2015 APPLICATION GUIDE FOR AC ADJUSTABLE SPEED DRIVE SYSTEMS
    ASTM E 2513 : 2007 Standard Specification for Multi-Story Building External Evacuation Platform Rescue Systems
    ASTM F 1837M : 1997 : R2012 : EDT 1 Standard Specification for Heat-Shrink Cable Entry Seals (Metric)
    NEMA ICS 3.1 : 2009(R2014) GUIDE FOR THE APPLICATION, HANDLING, STORAGE, INSTALLATION, AND MAINTENANCE OF MEDIUM-VOLTAGE AC CONTACTORS, CONTROLLERS, AND CONTROL CENTERS
    DIN EN ISO 23553-1:2014-09 Safety and control devices for oil burners and oil-burning appliances - Particular requirements - Part 1: Automatic and semi-automatic valves (ISO 23553-1:2014); German version EN ISO 23553-1:2014
    ASTM C 1217 : 2000 Standard Guide for Design of Equipment for Processing Nuclear and Radioactive Materials
    ISO 23553-1:2014 Safety and control devices for oil burners and oil-burning appliances Particular requirements Part 1: Automatic and semi-automatic valves
    UNE-EN ISO 23553-1:2014 Safety and control devices for oil burners and oil-burning appliances - Particular requirements - Part 1: Automatic and semi-automatic valves (ISO 23553-1:2014)
    NEMA 280 : 1990 APPLICATION GUIDE FOR GROUND FAULT CIRCUIT INTERRUPTERS
    IEC 62026-3:2014 Low-voltage switchgear and controlgear - Controller-device interfaces (CDIs) - Part 3: DeviceNet
    IEEE 515.1-2012 IEEE Standard for the Testing, Design, Installation, and Maintenance of Electrical Resistance Trace Heating for Commercial Applications
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    BS EN ISO 23553-1:2014 Safety and control devices for oil burners and oil-burning appliances. Particular requirements Automatic and semi-automatic valves
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    NEMA ICS 9 : 1993 INDUSTRIAL CONTROL AND SYSTEMS: POWER CIRCUIT ACCESSORIES
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