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Post by ulkesh54 on Jun 7, 2004 2:30:03 GMT -5
Does anyone know what the differences are between UL ratings for motors? What differentiates a Class A from a Class B rating?
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Post by Deleted on Jun 7, 2004 16:39:00 GMT -5
It has to do with the temperature the windings insulation is able to withstand. Class B is higher than Class A. Here's an excerpt:
" 9. Insulation Class. The temperature limit of the insulation system or the maximum allowable total operating temperature of the motor. Three classes of insulation are used: Class A-105 degrees Celsius maximum; Class B-130 degrees Celsius maximum; Class F-155 degrees Celsius maximum."
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Post by Andrew G. on Jun 7, 2004 17:49:23 GMT -5
It has to do with the temperature the windings insulation is able to withstand. Class B is higher than Class A. Here's an excerpt: " 9. Insulation Class. The temperature limit of the insulation system or the maximum allowable total operating temperature of the motor. Three classes of insulation are used: Class A-105 degrees Celsius maximum; Class B-130 degrees Celsius maximum; Class F-155 degrees Celsius maximum." Don't forget about class H-180 degrees celsius. |
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Post by ulkesh54 on Jun 8, 2004 1:11:22 GMT -5
It has to do with the temperature the windings insulation is able to withstand. Class B is higher than Class A. Here's an excerpt: " 9. Insulation Class. The temperature limit of the insulation system or the maximum allowable total operating temperature of the motor. Three classes of insulation are used: Class A-105 degrees Celsius maximum; Class B-130 degrees Celsius maximum; Class F-155 degrees Celsius maximum." Thanks for the info Dan. I had always been curious about what this rating meant. |
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