A three-phase electrical system is equipped with ground detecting lamps. If one of the lamps is dark, and remains dark when the test switch is operated, what does this indicate?

Question

Accepted Answer

the dark lamp must be replaced

Answer

there is a ground in the line with the dark lamp

Answer

there are grounds in two of the three phases

Answer

the voltage to the dark lamp is less than that of the system

🔍 Key Concepts

💭 Think About

✅ Before You Answer