Electrical Motors - Insulation Classes
Temperature and insulation classes
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An electrical motor will rapidly degrade if the internal temperature exceeds the insulation temperature limit.
| Insulation Class | Temperature Limits (oC) |
| A1) | 105 |
| B1) | 130 |
| H2) | 155 |
| F2) | 180 |
1) Hydroscopic insulation - avoided for open and outdoor locations - shortened lifetime if condensation in the insulation occurs
2) Non-hydroscopic insulation - preferred for open and outdoor locations, higher ambient temperatures ..
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