The circuit illustrated in figure "A"...

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Question 1 of 205eccefa4bacbc34ba4d483cd

The circuit illustrated in figure "A" represents a ground detecting system for a single phase AC system. If bus B is grounded as indicated, what will be the indication of a ground? See illustration EL-0008.

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🔍 Key Concepts

• How a single-phase ground detection circuit works with two identical lamps connected between each bus and a common junction • What changes electrically at the lamp junction when the test pushbutton connects that junction to ground • What happens to voltage across each lamp if one bus is already grounded by a fault

💭 Think About

• Before the test pushbutton is pressed, trace the complete current path from bus A to bus B. Are the two lamps in series or in parallel, and what does that imply about their brightness if they are identical? • After the pushbutton is pressed and the junction of the two lamps is grounded, what is the voltage from each bus (A and B) to ground, given that bus B is already faulted to ground? • Compare the voltage across lamp A and lamp B before and after the pushbutton is pressed. Which lamp, if any, ends up with full line voltage across it after the test is made?

✅ Before You Answer

• Confirm whether the two lamps are identical and therefore share voltage equally when in series between buses A and B. • Verify which node(s) are at ground potential before and after the pushbutton is pressed (consider the existing ground fault on bus B). • Double‑check which lamp is connected between bus A and the junction and which lamp is between bus B and the junction, then decide which lamp loses almost all voltage across it when the junction is forced to ground.

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