Basic Qualification · B-003 Station assembly, practice and safety · B-003-018-007
What is the lowest voltage that is usually considered hazardous to humans?
- A 30
- B 100
- C 240
- D 347
Correct answer: A — 30. From the official ISED question bank, verified word for word.
Why
Thirty volts is the lowest level generally considered dangerous because even this modest amount can push enough current through wet skin to disrupt the heart or cause severe muscle contractions. 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.