Gas Fitter Practice Test

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Fuses serving motor circuits should be:

  1. Quick blow type

  2. Time delay type

  3. Oversized by 2.5%

  4. Oversized by 3.5%

The correct answer is: Time delay type

Fuses serving motor circuits should be of the time delay type because motors typically experience inrush currents that are significantly higher than their normal operating currents during startup. A time delay fuse is designed to withstand this temporary overload without blowing, allowing the motor to start properly. This quality prevents nuisance tripping, which can interrupt operations when the motor initially draws higher current levels as it accelerates. Using a time delay fuse ensures that the protection device only activates during prolonged overload conditions or short circuits, rather than during the normal transient conditions associated with starting a motor. This characteristic is essential for maintaining the reliability of the motor circuit and ensuring the longevity of the equipment being powered.

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