With an accidental ground on leg C as shown...

Question 1 / 205eccefa4bacbc34ba4d483cf

Question 1 of 205eccefa4bacbc34ba4d483cf

With an accidental ground on leg C as shown in figure "B" of the illustration and the test pushbutton is not yet depressed, which of the lamps would be dimmest? See illustration EL-0008.

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Question 1 of 20

5eccefa4bacbc34ba4d483cf

With an accidental ground on leg C as shown in figure "B" of the illustration and the test pushbutton is not yet depressed, which of the lamps would be dimmest? See illustration EL-0008.

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🔍 Key Concepts

• Three-phase ground detection circuit with three lamps connected from each phase (A, B, C) to a common junction • Effect of an unintended ground on one phase before the test pushbutton ties the junction to ground • How lamp brightness relates to voltage across each lamp (more voltage = brighter, less = dimmer)

💭 Think About

• Trace the current path if leg C is accidentally grounded but the test pushbutton is OPEN. Through which lamp(s) can current actually return to ground? • Compare the potential of the common junction (bottom of all three lamps) to the grounded phase C. Is that junction closer in voltage to phase C, or to phases A and B? How does that affect voltage across each lamp? • In a healthy system with no grounds, all three lamps share the same type of connection. What specifically changes for the lamp connected to the grounded phase when the fault occurs?

✅ Before You Answer

• Be clear about which side of each lamp is connected to a phase conductor and which side is connected to the common junction/test switch • Confirm that, with the test pushbutton NOT pressed, the only solid connection to ground is the accidental ground on leg C • Determine which lamp has the smallest voltage difference between its two terminals; that one will be the dimmest.

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Question 1 of 20

With an accidental ground on leg C as shown in figure "B" of the illustration and the test pushbutton is not yet depressed, which of the lamps would be dimmest? See illustration EL-0008.

Lamps A and B

Lamp C

All three lamps would be equally bright

All three lamps would be dark

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Question 1 / 205eccefa4bacbc34ba4d483cf

Question 1 of 205eccefa4bacbc34ba4d483cf

With an accidental ground on leg C as shown in figure "B" of the illustration and the test pushbutton is not yet depressed, which of the lamps would be dimmest? See illustration EL-0008.

Back

Question 1 of 20

5eccefa4bacbc34ba4d483cf

With an accidental ground on leg C as shown in figure "B" of the illustration and the test pushbutton is not yet depressed, which of the lamps would be dimmest? See illustration EL-0008.

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