Discussion
Three of the following are found with a thermal imager during an audit. The exception is
Answer: D
Correct answer: the power factor of a feeder
Power factor is an electrical relationship between voltage and current and produces no thermal signature at all; it is read with a power analyser. The other three are all classic thermal imaging finds - a hot joint, a cold or wet patch on lagging, and a trap running at line temperature on its downstream side because it is passing live steam.
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