On a main switchboard, if all three ground...

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Question 1 of 205eccefa4bacbc34ba4d483d5

On a main switchboard, if all three ground detection lamps burn with equal intensity before and after the test button is depressed, which of the listed conditions is indicated?

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Question 1 of 20

5eccefa4bacbc34ba4d483d5

On a main switchboard, if all three ground detection lamps burn with equal intensity before and after the test button is depressed, which of the listed conditions is indicated?

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🔍 Key Concepts

• Ground detection lamp circuits on a three‑phase system and what “equal intensity” means • What should normally happen to the lamps when the test button is pressed if there is no ground • How a single line‑to‑ground fault vs. multiple grounds would change lamp brightness

💭 Think About

• Think about what the lamps are comparing: phase voltage to ground. If everything is normal, how will each lamp behave before and during the test? • When the test button is pushed, does it intentionally simulate a ground or remove one? How should that change at least one lamp’s brightness if the system is working correctly? • If a real ground existed on one phase, which lamp (for that phase or the other phases) would you expect to change in brightness compared to the others?

✅ Before You Answer

• Be clear on what the test switch actually does in a standard ground detection circuit (does it create a temporary ground or open the circuit?). • Ask: if all three phases were grounded, would the voltages to ground be equal or not, and would the detector even work normally? • Verify which option corresponds to a condition where the indicator circuit is healthy and no asymmetry to ground is detected even during the test.

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Question 1 of 205eccefa4bacbc34ba4d483d5

On a main switchboard, if all three ground detection lamps burn with equal intensity before and after the test button is depressed, which of the listed conditions is indicated?

Back

Question 1 of 20

5eccefa4bacbc34ba4d483d5

On a main switchboard, if all three ground detection lamps burn with equal intensity before and after the test button is depressed, which of the listed conditions is indicated?

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed