Engineering · Electrical — Shore Power
When connecting a vessel to shore power, it is essential to verify that the shore supply has the correct voltage, frequency, and:
- AColor of cable
- BPhase sequence (rotation)✓ Correct
- CLength of cable
- DTime of day
Explanation
Incorrect phase rotation would run motors backwards and can damage equipment. Voltage, frequency, and phase sequence must all match, and a phase-sequence indicator at the shore connection box is checked before energizing.
Authority: Marine Electrical (USCG engineering topic)
Practice the full Engineering bank
Free spaced-repetition quizzing across 2190 USCG exam questions — it schedules your reviews so the ones you miss come back until they stick.
Related Engineering questions
- Electrical — Shore Power
Before connecting shore power to a vessel's system, you must verify:
- Electrical — Shore Power
Before connecting shore power to a three-phase ship's system, it is important to verify correct:
- Diesel — Operating Cycle
In a four-stroke-cycle diesel engine, the events occur in which order?
- Diesel — Operating Cycle
Compared with a four-stroke engine of the same speed and cylinder size, a two-stroke-cycle diesel produces a power stroke:
- Diesel — Air Systems
The primary purpose of scavenging in a two-stroke diesel engine is to:
- Diesel — Air Systems
A turbocharger increases engine power output mainly by: