Discussion
Modern machines are very often wound with Class F material. The total temperature that such insulation will withstand is
Answer: A
Correct answer: 155 °C
Class F permits 155 degrees in total. Most modern machines are wound with Class F material but rated for a Class B temperature rise, which leaves 25 degrees in hand - margin that can be spent on a hot ambient, on altitude derating, or simply on longer insulation life. It is one of the most useful facts in motor selection.
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