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NEMA Motor Enclosures

ODP (Open Drip Proof):An open motor in which the ventilating openings are so constructed that drops of liquid or solid particles falling on it, at any angle not greater than 15 degrees for the vertical, cannot enter either directly or by striking and running along a surface of the motor. Designed for reasonably dry, clean, and well ventilated (usually indoors) areas. Outdoor installations require the motor to be protected with a cover that does not restrict the flow of air to the motor.

TEFC (Totally Enclosed Fan Cooled): A motor so enclosed as to prevent the free exchange of air between the inside and outside of the case, but not sufficiently enclosed to be termed air-tight, and dust does not enter in sufficient quantity to interfere with satisfactory operation. Cooling is by means of an external fan as an integral part of the motor. The fan provides cooling by blowing air on the outside of the motor. Suitable where the motor is exposed to dirt or dampness. Not suited in very moist humid or hazardous (explosive) locations.

TENV (Totally Enclosed Non Ventilated): A motor so enclosed as to prevent the free exchange of air between the inside and outside of the case but not sufficiently enclosed to be termed air-tight, and dust does not enter in sufficient quantity to interfere with satisfactory operation. Cooling is only by convection and radiation from the enclosure. Suitable where the motor is exposed to dirt or dampness. Not suited in very moist humid or hazardous (explosive) locations.

TEAO (Totally Enclosed Air Over):A motor so enclosed as to prevent the free exchange of air between the inside and outside of the case. A dust-tight enclosure used on fan and blower motors for shaft mounted fans or belt driven fans. The motor must be mounted within the airflow of the fan for cooling.

DPAO (Drip Proof Air Over): An open motor in which the ventilating openings are so constructed that drops of liquid or solid particles falling on it, at any angle not greater than 15 degrees for the vertical, cannot enter either directly or by striking and running along a surface of the motor. Used on fan and blower motors for shaft mounted fans or belt driven fans. The motor must be mounted within the airflow of the fan for cooling.

TEBC (Totally Enclosed Blower Cooled): A motor so enclosed as to prevent the free exchange of air between the inside and outside of the case, but not sufficiently enclosed to be termed air-tight, and dust does not enter in sufficient quantity to interfere with satisfactory operation. Used on inverter duty motors. Cooled with external fan on a power supply independent of the inverter output. Provides full cooling even at lower motor speeds.

Explosion Proof: A totally enclosed motor whose enclosure is designed and constructed to withstand an explosion of a specified gas or vapor which may occur within it and to prevent the ignition of the specified gas or vapor surrounding the motor by sparks, flashes, or explosions of the gas or vapor which may occur within the motor housing.

EPNV (Explosion-Proof Non Ventilated): A non-ventilated explosion proof motor. See TENV and Explosion-Proof above.

EPFC (Explosion-Proof Fan Cooled): A fan cooled explosion-proof motor. See TEFC and Explosion-Proof above.

 

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State of NJ