Discussion
The standard ambient temperature assumed in motor ratings is
Answer: B
Correct answer: 40 °C
Standard ratings assume an ambient of 40 degrees and an altitude up to 1000 metres. A machine used in a hotter room has less temperature rise available before the insulation limit, so it must be derated or a larger frame chosen - and one used in a cooler room may carry more, though the manufacturer’s permission is needed to claim it.
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