Exam Question
(a) How protection is provided for electrical short circuit. (4)
(b) Describe the construction and operation of HRC fuses. (8)
(c) What are the advantages of HRC fuses. (4)
Class 4 (4th Engineer)
MET
📅 Nov 2024
Reference Answer
### (a) How protection is provided for electrical short circuit.
Protection for electrical short circuits is fundamentally achieved by rapidly detecting an abnormal overcurrent condition and interrupting the electrical supply before damage occurs to the equipment, cables, or personnel. This is primarily accomplished through two main categories of protective devices:
* **Fuses:**
* **Principle:** A fuse is a sacrificial device containing a metallic wire or element designed to melt and open the circuit when the current flowing through it exceeds a predetermined level for a specified duration.
Protection for electrical short circuits is fundamentally achieved by rapidly detecting an abnormal overcurrent condition and interrupting the electrical supply before damage occurs to the equipment, cables, or personnel. This is primarily accomplished through two main categories of protective devices:
* **Fuses:**
* **Principle:** A fuse is a sacrificial device containing a metallic wire or element designed to melt and open the circuit when the current flowing through it exceeds a predetermined level for a specified duration.
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