Electrical Exam Term
Ambient Temperature
The temperature of the surrounding environment where electrical equipment or conductors are installed.
Detailed Explanation
Ambient temperature directly affects conductor ampacity. NEC Table 310.15(B)(1) provides correction factors: as ambient temperature rises above 30°C (86°F), conductor ampacity must be reduced (derated). For example, a conductor in a 40°C environment must be derated to 88% of its listed ampacity. This is critical in attics, boiler rooms, and outdoor installations exposed to direct sunlight.
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Practice QuestionEasy
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