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.
Related Questions
Q76:When securing an AC generator, what should be your FIRST action in accomplishing... Q34:The wet cell storage batteries shown in the illustration are connected in what c... Q219:A three-phase alternator operates at 450 volts with a 0.8 power factor. If the a... Q343:In terms of the battery electrolyte, when performing maintenance of alkaline bat... Q266:In comparison to a main switchboard for a DC electrical distribution system, a m...
Ready to test your knowledge?
Take a Electricity & Electronics - QMED Practice ExamOfficial Resources