If all of the ground detection lamps burn...

If all of the ground detection lamps burn...

Question 1 / 270705eccefa4bacbc34ba4d483d6

Question 1 of 270705eccefa4bacbc34ba4d483d6

If all of the ground detection lamps burn with equal brilliance, whether the test button is depressed or released, what does this indicate?

Question 1 of 27070

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Q

If all of the ground detection lamps burn with equal brilliance, whether the test button is depressed or released, what does this indicate?

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🔍 Key Concepts

• Ground detection lamps operation on an ungrounded shipboard system • What should happen to lamp brightness when a ground fault occurs on one phase • Difference between no fault, single-phase fault, and multiple/solid faults indications

💭 Think About

• Think about what the lamps are actually comparing when you press and release the test button. • If all lamps stay the same brightness in BOTH positions, what does that say about the relative voltages to ground on each phase? • How would the indications look different if only one phase were grounded, or if there were a solid (dead) ground on one phase?

✅ Before You Answer

• Be clear on how a three-lamp ground detector behaves in a healthy system. • Consider what a dead (solid) ground on one phase would do to that lamp compared with the others. • Decide whether equal brilliance in all conditions means no shift, complete shift, or masking of the fault.