In a three-phase electrical system, three...

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Question 1 of 205eccefa4bacbc34ba4d483d9

In a three-phase electrical system, three ground detecting lamps are provided. One lamp goes dark and the others increase in brightness when the "ground test" button is pushed. What is indicated?

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Question 1 of 20

5eccefa4bacbc34ba4d483d9

In a three-phase electrical system, three ground detecting lamps are provided. One lamp goes dark and the others increase in brightness when the "ground test" button is pushed. What is indicated?

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🔍 Key Concepts

• Three-phase ground detection circuits and how lamps are wired (line-to-ground through equal resistances) • What happens to voltage distribution across lamps when one phase is grounded • Difference between a fault condition and a burned-out lamp or normal operation

💭 Think About

• If one phase becomes solidly grounded, what happens to its voltage to ground and the current through its lamp compared to the other two? • Why would two lamps get brighter and one go dark instead of all three changing equally? • In normal, unfaulted conditions, how should the brightness of all three ground-detecting lamps compare?

✅ Before You Answer

• Verify which phase (line) the dark lamp is connected to relative to the grounded conductor • Confirm whether a single-phase-to-ground fault would remove voltage from one lamp or from two • Check your understanding of what normal indication (no ground fault) looks like on a three-lamp ground detection panel

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Question 1 of 205eccefa4bacbc34ba4d483d9

In a three-phase electrical system, three ground detecting lamps are provided. One lamp goes dark and the others increase in brightness when the "ground test" button is pushed. What is indicated?

Back

Question 1 of 20

5eccefa4bacbc34ba4d483d9

In a three-phase electrical system, three ground detecting lamps are provided. One lamp goes dark and the others increase in brightness when the "ground test" button is pushed. What 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