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Use of a F/B motor as F/F

Use of a F/B motor as F/F

Use of a F/B motor as F/F

(OP)
Hello,

If my understanding is correct, a motor with an insulation class F with a temperature increase B has a 25ºC margin for operating continously without affecting its design life. If this is correct, one could use a motor purchased as F/B with no risk at F/F.

My question is: if the rated power of the motor at its nameplate is for F/B, then, how can be the increased rated power at F/F be obtained?

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