USCG Exam PracticeSwitchboards and distribution systems
An AC emergency switchboard is required to have a voltmeter with a selector switch. Which of the following correctly describes what that voltmeter must be capable of displaying?
- ✓ Generator voltage of each phase and bus voltage of one phase.Correct
- B. Bus voltage of each phase and generator voltage of one phase.
- C. Generator voltage of each phase and bus voltage of each phase.
- D. Bus voltage of one phase only.
Why A is correct
46 CFR §111.30-29(f)(2) requires the voltmeter selector switch to show generator voltage of each phase and bus voltage of one phase. Requiring bus voltage of each phase or reversing the single-phase requirement are common misreadings of the regulation.
Cited:46 CFR §111.30-29