Basic Qualification · B-003 Station assembly, practice and safety · B-003-018-004
Why would there be a switch in a high-voltage power supply to turn off the power if its cabinet is opened?
- A To turn the power supply off when it is not being used
- B To keep anyone opening the cabinet from getting shocked by dangerous high voltages
- C To keep dangerous RF radiation from leaking out through an open cabinet
- D To keep dangerous RF radiation from coming in through an open cabinet
Correct answer: B — To keep anyone opening the cabinet from getting shocked by dangerous high voltages. From the official ISED question bank, verified word for word.
Why
High voltages inside a power supply can kill instantly, so a safety switch cuts the electricity the moment the cabinet is opened to protect anyone reaching inside. 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.