A current-carrying conductor makes...

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Question 1 of 205eccefa4bacbc34ba4d483c9

A current-carrying conductor makes accidental contact with a wiring conduit. How will this be indicated on the switchboard, as compared to indications when the situation is normal, assuming that the distribution system is an ungrounded system?

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🔍 Key Concepts

• Ungrounded distribution system behavior during a single ground fault • Purpose and operation of ground detection lamps or meters on a ship's switchboard • Difference between normal indications and first ground fault indications on ungrounded systems

💭 Think About

• In an ungrounded system, what happens to line-to-ground voltages when one conductor accidentally contacts ground? Do they all go to zero, all go up, or does only one change? • How do ground-detecting lamps (usually three lamps to ground) indicate an imbalance or ground on one phase/line compared with normal balanced conditions? • Which instrument on the switchboard is specifically designed to show a ground fault: wattmeter, voltmeter, ground detector lamps, or synchronizing lamps?

✅ Before You Answer

• Review how three ground‑detecting lamps are normally connected (each phase to ground through a lamp, or via a resistor/transformer) and what they look like with no fault present. • Confirm that a single line-to-ground fault in an ungrounded system does NOT normally cause a big change in total kW (wattmeter) or require synchronizing lamps. • Focus on the indication that directly measures insulation/ground condition, not power, voltage between phases, or generator synchronization.

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