Discussion
A drive with a 2 per cent total loss at 500 kW output dissipates
Answer: B
Correct answer: about 10 kW into its enclosure
\[ 0.02 \times 500 = 10\ \mathrm{kW}. \] Two per cent sounds negligible until it is expressed in kilowatts, and all of it appears as heat inside the cabinet. The room ventilation or air conditioning must remove it, which is why the drive’s loss is part of the building services calculation and not only the drive’s own.
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