TEFC motor

[QES]

Is all TEFC motor rated for Class 1 div 2?

 

[jim dungar]

Is all TEFC motor rated for Class 1 div 2?

No.

Some TEFC motors are used in wash down environments.

 

[Jraef]

No, the equivalent designation would be XPFC or XPNV. The difference is mainly in the connection box. Explosion proof does not just mean it will not spark to cause an explosion; any AC squirrel cage induction motor could qualify in that regard. XP also dictates that if explosive gasses get into the conduit and an explosion propagates inside, the hot gasses will not escape and start another explosion at the motor location. So on an XP motor, the pecker head has an XP box, usually cast aluminum with wide flanges to cool any escaping hot gasses.

 

[don_resqcapt19]

Is all TEFC motor rated for Class 1 div 2?

I am not sure what you are asking. In general a TEFC motor without internal spark producing contacts is permitted to be used in a Class I, Division 2 location.

501.125(B) Class I, Division 2 In Class I, Division 2 locations, motors, generators, and other rotating electric machinery in which are employed sliding contacts, centrifugal or other types of switching mechanism (including motor overcurrent, overloading, and overtemperature devices), or integral resistance devices, either while starting or while running, shall be identified for Class I, Division 1 locations, unless such sliding contacts, switching mechanisms, and resistance devices are provided with enclosures identified for Class I, Division 2 locations in accordance with 501.105(B). The exposed surface of space heaters used to prevent condensation of moisture during shutdown periods shall not exceed 80 percent of the ignition temperature in degrees Celsius of the gas or vapor involved when operated at rated voltage, and the maximum surface temperature [based on a 40?C (104?F) ambient] shall be permanently marked on a visible nameplate mounted on the motor. Otherwise, space heaters shall be identified for Class I, Division 2 locations. In Class I, Division 2 locations, the installation of open or nonexplosionproof enclosed motors, such as squirrel-cage induction motors without brushes, switching mechanisms, or similar arc-producing devices that are not identified for use in a Class I, Division 2 location, shall be permitted.

 

[weressl]

Is all TEFC motor rated for Class 1 div 2?

No they are not necessarily rated, but suitable for installation in Class I, Division 2 areas, unless they contain space heaters that are not listed for Class I, Division 2 locations or contain integral switching devices that are wired up and if those are not rated for the Cl./Div.