How should a fuse be installed in a circuit to insure proper operation?

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Prepare for the PMMI Industrial Electricity Test with quizzes featuring flashcards and multiple-choice questions. Each answer is explained with hints to ensure a thorough understanding. Gear up to excel in your exam!

Multiple Choice

How should a fuse be installed in a circuit to insure proper operation?

Explanation:
Fuses protect by interrupting current when it exceeds their rating, so they have to be in the path of the load. Placing the fuse in series with the load ensures that the same current flowing to the equipment also flows through the fuse. When an overcurrent occurs, the fuse element melts and opens, disconnecting power from the load. If the fuse were placed in the ground conductor, it wouldn’t be in the current path to the load, so it wouldn’t protect the circuit. If it were in parallel with the load, the fuse would provide an alternate path instead of breaking the load current, so the load could stay powered and the fault wouldn’t be cleared.

Fuses protect by interrupting current when it exceeds their rating, so they have to be in the path of the load. Placing the fuse in series with the load ensures that the same current flowing to the equipment also flows through the fuse. When an overcurrent occurs, the fuse element melts and opens, disconnecting power from the load.

If the fuse were placed in the ground conductor, it wouldn’t be in the current path to the load, so it wouldn’t protect the circuit. If it were in parallel with the load, the fuse would provide an alternate path instead of breaking the load current, so the load could stay powered and the fault wouldn’t be cleared.

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