What are insulation classes of motors? Business Articles | February 22 Nick Foligno Jersey , 2012
You have heard a lot about class A and class F classification, while purchasing motors. What are these classifications? What do these classes indicate? This article gives an answer to all your queries...

You have heard a lot about class A and class F classification, while purchasing motors. What are these classifications? What do these classes indicate? This article gives an answer to all your queries.
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NEMA is the association for electrical goods manufacturing industry. NEMA stands for National Electrical Manufacturers Association, who has set the standards for the electrical industry. It is a commonly seen that an electrical motor will fail when the internal temperature of the motor raises beyond the insulation temperature limit. Therefore David Savard Jersey , NEMA specifies certain alphabets that indicate motor temperature and insulation rates. They also specify a temperature limit at maximum load for motors. That is to note that, a motor must not operate at temperatures above the maximum limit. For any motor, the reference ambient temperature is 40°C.
Maximum temperature limit is ambient temperature + allowed temperature +allowance for ?hot spot ?.

Below listed are the different classes, as coined by NEMA Oliver Bjorkstrand Jersey , IEC standards, and Underwriters Laboratories.

Class A

Class A accepts a 60°C rise with a hot spot of 5°C, which means, Class A can withstand the temperature limit up to 105°C. You can use organic materials like silk Ryan Murray Jersey , paper, cotton, and certain synthetic fibers at this temperature.

Class E

As per the IEC class E, maximum temperature allowed for PET (Poly Ethylene Terephthalate) Sonny Milano Jersey , Polyurethane, some resins, etc is 120°C.

Class B

In Class B, maximum hot pot temperature allowed is 130°C. This accepts a temperature rise of 80°C and a hot spot of 10°C. This is the right temperature for substances like glass fiber Riley Nash Jersey , asbestos, mica, and few other inorganic materials.

Class F

This is the most common for International and 50 Cycles motor and suitable for temperatures up to 155°C. Class F accepts a temperature rise of 105°C and a hot spot of 10°C. Materials with usable lifetime and Class B materials with binders that are stable at higher temperatures require Class F motors.

Class H

Class 130 inorganic materials that uses high temperature binders or other materials that has usable lifetime are the usual materials at this temperature. Temperature allowed is 180°C, which means Cam Atkinson Jersey , it accepts a temperature rise of 125°C and a hot spot of 15°C.

Class N

Class N is recommended for a motor that is suitable for Class B materials and Teflon. Maximum temperature allowed is 200°C.

Class R

The temperature limit acceptable is 220°C. The materials recommended are just the same as for Class 200 (Class N)

Class S

There is no proper material data for class S. However, the temperature limit is 240°C.

As the above classes indicate, for every 10°C rise in temperature, the operating life of a motor is degraded or halved. To be more precise Alexander Wennberg Jersey , the insulation of the motor is weakened when there is a high temperature rise. Therefore, reducing the temperature will increase the life span of your motor.


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