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  2. NEMA enclosure types - Wikipedia

    en.wikipedia.org/wiki/NEMA_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 ...

  3. Induction motor - Wikipedia

    en.wikipedia.org/wiki/Induction_motor

    The typical speed-torque relationship of a standard NEMA Design B polyphase induction motor is as shown in the curve at right. Suitable for most low performance loads such as centrifugal pumps and fans, Design B motors are constrained by the following typical torque ranges: [30] [b] Breakdown torque (peak torque), 175–300% of rated torque

  4. TEFC motor - Wikipedia

    en.wikipedia.org/wiki/TEFC_motor

    A Totally Enclosed, Fan-Cooled (TEFC) electric motor is a type of industrial electric motor with an enclosure that does not permit outside air to freely circulate through the interior of the motor. [1] An external fan blows outside air over the frame of the motor to cool it. This motor is arguably the most commonly used motor in ordinary ...

  5. Electrical equipment in hazardous areas - Wikipedia

    en.wikipedia.org/wiki/Electrical_equipment_in...

    4.3 NEMA enclosure types. 5 Labeling. Toggle Labeling subsection. 5.1 Europe. 5.2 North America. 6 History. 7 See also. 8 References. 9 Further reading. Toggle the ...

  6. National Electrical Manufacturers Association - Wikipedia

    en.wikipedia.org/wiki/National_Electrical...

    The National Electrical Manufacturers Association (NEMA) [5] is the largest trade association of electrical equipment manufacturers in the United States. [6] Founded in 1926, it advocates for the industry and publishes standards for electrical products. Notably, the form of US household electrical outlets and plugs is specified by NEMA.

  7. 19-inch rack - Wikipedia

    en.wikipedia.org/wiki/19-inch_rack

    Although there is no standard for the depth of equipment, nor specifying the outer width and depth of the rack enclosure itself (incorporating the structure, doors and panels that contain the mounting rails), there is a tendency for 4-post racks to be 600 mm (23.62 in) or 800 mm (31.50 in) wide, and for them to be 600 mm (23.62 in), 800 mm (31. ...

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