NEMA 4X tefc motor in a class 1 div 1 and div 2 location
- Thread starter rey-man
- Start date
- Status
- Location
- Mission Viejo, CA
- Occupation
- Professional Electrical Engineer
They are common in Class I, Division 2 and there are protection techniques that would permit them in Class I, Division 1. We would need lots of details to determine if a specific application is suitable.
petersonra
Senior Member
- Location
- Northern illinois
- Occupation
- Semi-retired engineer
Is there even such a thing as a NEMA4X TEFC motor?
Maybe a UL type 4X TEFC motor. Not even sure that exists.
- Location
- Mission Viejo, CA
- Occupation
- Professional Electrical Engineer
NEMA MG-1 doesn't recognize "Type 4X" enclosures as it applies to motors; however, virtually all NEMA "Totally Enclosed" motor types would meet 4X requirements and I understood what rey-man meant. Most explosionproof motors are basically modified TEFC or TENV. UL lists explosionproof motors for Division 1 and a few (VERY few) motors for specific Division 2 applications. No motors are listed for "ordinary locations."
Many "ordinary location" motors are acceptable "as is" in Class I, Division 2. See the last sentence in 501.125 (B): "... 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."
what sort of details should i look for? ...to determine if it is suitable to Class 1 div1 location.
the nameplate does not even tell the "T" rating of the motor.
as always, thanks for your responses.
petersonra
Senior Member
- Location
- Northern illinois
- Occupation
- Semi-retired engineer
If it is suitable for use in a division 1 area it will say so on the nameplate.
aside from that?
petersonra
Senior Member
- Location
- Northern illinois
- Occupation
- Semi-retired engineer
no doubt you could look at the instruction manual. or call the manufacturer.
if it is listed as XP, it will be labeled that way. if you can't find it, it is not XP.
in a cls 1 div 1 area, if the motor needs to connect to a toggle switch, do you need to put a seal 18" from within the motor and the switch, if the run is more than 3 ft?
is there such a thing that at certain HP ratings, seals are not required?
thanks again.
is there such a thing that at certain HP ratings, seals are not required?
thanks again.
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