Which of the following material is NOT used as fuse wire?

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ALP CBT 2 Electrician Official Paper (Held On: 23 Jan 2019 Shift 3)
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  1. Copper
  2. Aluminium
  3. Paper
  4. Silver

Answer (Detailed Solution Below)

Option 3 : Paper
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  • An electrical safety device that is used to protect the electrical circuit from the overloads is called fuse.
  • The material mainly used for fuse element are tin, lead, silver, copper, zinc, aluminum, and an alloy of lead and tin.
  • An alloy of lead and tin is used for small current rating fuses.
  • For current exceeding 15 A this alloy is not used as the diameters of the wire will be larger and after fusing the metal released will be excessive.
  • Beyond 15 A rating circuit, copper wire fuses are employed.

 

Note:

The material used for fuse elements must have the following properties:

  • Low melting point
  • Low ohmic loss
  • High conductivity (or low resistivity)
  • Low cost
  • Free from detraction
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