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G0B05

ELECTRICAL AND RF SAFETY · - Station safety: electrical shock, grounding, fusing, interlocks, and wiring; antenna and tower safety

G0B05G0B →

Which of the following conditions will cause a ground fault circuit interrupter (GFCI) to disconnect AC power?

  1. ACurrent flowing from one or more of the hot wires to the neutral wire
  2. BCurrent flowing from one or more of the hot wires directly to ground
  3. COvervoltage on the hot wires
  4. DAll these choices are correct
Why A GFCI continuously compares the current leaving on the hot conductor with the current returning on the neutral. Those should be equal; if they differ by roughly 5 milliamps, some current is escaping to ground, possibly through a person, and the device trips in a fraction of a second. So it is current leaking from hot directly to ground that causes the disconnect, not the size of the load current.
Watch out Current from hot to neutral is simply normal load current, which a GFCI ignores no matter how large; overcurrent is the job of the fuse or breaker, and overvoltage is handled by surge protection, not a GFCI.
GFCI = balance check. Hot out must equal neutral back; about 5 mA going missing to ground trips it.
HamSandwich explanation, first draft. The question and answers are the NCVEC text.
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The rest of G0B

  1. G0B01 Which wire or wires in a four-conductor 240 VAC circuit should be attached to fuses or circuit breakers?
  2. G0B02 According to the National Electrical Code, what is the minimum wire size that may be used safely for wiring w…
  3. G0B03 Which size of fuse or circuit breaker would be appropriate to use with a circuit that uses AWG number 14 wiri…
  4. G0B04 Where should the station's lightning protection ground system be located?
  5. G0B05 Which of the following conditions will cause a ground fault circuit interrupter (GFCI) to disconnect AC power?
  6. G0B06 Which of the following is covered by the National Electrical Code?
  7. G0B07 Which of these choices should be observed when climbing a tower using a safety harness?
  8. G0B08 What should be done before climbing a tower that supports electrically powered devices?
  9. G0B09 Which of the following is true of an emergency generator installation?
  10. G0B10 Which of the following is a danger from lead-tin solder?
  11. G0B11 Which of the following is required for lightning protection ground rods?
  12. G0B12 What is the purpose of a power supply interlock?
  13. G0B13 Where should lightning arrestors be located?
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