Engine : Electricity - 405/1386
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| 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? |
| A) there is a ground in the line with the dark lamp |
| B) there are grounds in two of the three phases |
| C) the voltage to the dark lamp is less than that of the system |
| D) the dark lamp must be replaced |
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