Basic Qualification · B-003 Station assembly, practice and safety · B-003-019-011
Why do fuses have a voltage rating?
- A To prevent dielectric breakdown of the fuse holder
- B To limit current leakage to ground while in operation
- C To ensure voltage transients can be safely dissipated
- D To specify the voltage that can be interrupted without arcing
Correct answer: D — To specify the voltage that can be interrupted without arcing. From the official ISED question bank, verified word for word.
Why
A fuse must stop current flow when it melts, but the electricity can jump across the gap as a spark called an arc if the voltage is too high. The full explanation — and one for every question — is in Pro.
Practise this section
Building a station safely: power supplies, grounding, RF exposure, lightning, feedline routing, and what a transmitter, receiver and transceiver actually do.