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Understanding Fuses in Electrical Circuits

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Understanding Fuses in Electrical Circuits

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Questions and Answers

What happens when the current rating of a fuse is exceeded?

The fuse becomes brittle and breaks.

The metal strip cools down and solidifies.

The metal strip expands and disconnects the circuit.

The metal strip heats up and melts. (correct)

Which type of fuse is considered unsafe due to its interchangeability regardless of rating?

Time delay fuse

Cartridge fuse

Edison-base plug fuse (correct)

Type S plug fuse

In what scenarios are time delay fuses particularly useful?

For immediate circuit disruptions

For fuses with low melting temperatures

For continuous overloads

For handling overloads for a fraction of a second (correct)

What is the purpose of an overcurrent protection device's Overcurrent Rating?

To determine its amperage limit under specific conditions Signup and view all the answers

Why are Edison plug fuses no longer allowed in new and retrofit installations?

Their interchangeability causes improper protection Signup and view all the answers

What is the Interrupting Rating requirement for circuit breakers and fuses based on the provided text?

5,000 A and 10,000 A respectively Signup and view all the answers

What is the difference between Nonmetallic-Sheathed Cable (NM) and Nonmetallic-Sheathed Cable (NMC)?

NMC has conductors encased in the sheathing while NM does not Signup and view all the answers

What distinguishes Underground Feeder (UF) cables from other types of cables mentioned in the text?

UF cables are suitable for direct burial applications Signup and view all the answers

What distinguishes Service Entrance (SE) cable from Underground Service Entrance (USE) cable?

SE cable is suitable for exposed above-grade conditions Signup and view all the answers

How can Armored Cable be classified based on the insulation type of the conductors?

AC if the insulation is thermoplastic and ACT if the insulation is rubber Signup and view all the answers