Motor thermal Protection

[furlong]

If a moter has thermal protection ( P leads ) is it requred to hook them up in a Class 1 Zone 2 location?

 

[sgunsel]

Motors always require thermal overload protection.

 

[QES]

Are you referring to the thermal switch(s) in the motor winding?

 

[furlong]

Yes. It is the thermal switches internal in the moter

 

[QES]

then Yes,
the switch(s) required to be rated for class 1 div 2 or hermetically sealed.

 

[QES]

If you are using a combination starter w/ thermal overload then you are not required to use the thermal switch.

 

[don_resqcapt19]

Some motors for classified areas require that you use the internal motor winding temperature switch to prevent the exterior surface of the motor from getting too hot. This requirement is more common in a Class II installation than in a Class I installation, but may be required in a Class I, Division 1 location per the last part of 501.125(A).

 

[rbalex]

In this case, determining the correct answer is not a trivial exercise. In order to give a complete and accurate answer, we need to know the following:

• The Zone 2 Group and "T-Code"?
• The motor "T-Code" and/or insulation class (both if you can get them)
• Does the motor nameplate or other label specify Class, Division and/or Zone; if so, what is it?
• Does the motor have an "Ex" mark; if so, what is it? Specify Ex, EEx, and/or AEx (Any and all)
• Any NRTL or third party certification marks (UL, CSA, FM, CE, etc.) Give full description. Example: NRTLCSACAN.
• Manufacturer - this last is not usually critical, but may be helpful.

 

[furlong]

The Zone 2 Group and "T-Code"?
The motor "T-Code" and/or insulation class (both if you can get them)
The T-Code is T3C

Does the motor nameplate or other label specify Class, Division and/or Zone; if so, what is it?
Class1 Div1&2. Class 21 Zone 1&2

Does the motor have an "Ex" mark; if so, what is it? Specify Ex, EEx, and/or AEx (Any and all)
Not that I could find.

Any NRTL or third party certification marks (UL, CSA, FM, CE, etc.) Give full description. Example: NRTLCSACAN.
UL listed

Manufacturer - this last is not usually critical, but may be helpful.
Baldor

 

[rbalex]

Still need the Zone 2 Group & "T-Code." That is, the Group and "T-Code" for the location the motor is to be installed in.