Question 281Electricity & Electronics - QMED
70% to passHow is electrical conductor insulation classed? Example: insulation class H
Aconductor ampacity
Bconductor current carrying capacity
Cvoltage rating of the insulation
Dlimiting internal hot spot temperature
AI Explanation
The correct answer is D) limiting internal hot spot temperature. Insulation classes are defined by the maximum internal hot spot temperature that the insulation can withstand without degradation. For example, insulation class H is rated for a maximum hot spot temperature of 180°C. This temperature rating determines the current-carrying capacity or ampacity of the conductor, not the other way around. The voltage rating of the insulation is a separate specification. The other answer choices do not directly relate to how insulation is classified.
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