A circuit is disconnected by isolators when____________?
Correct answer: B. there is no current in the line
- A. line is energized
- B. there is no current in the line
- C. line is on full load
- D. circuit breaker is not open
Explanation
An isolator is an off-load switching device and has no arc-quenching facility for interrupting current. The circuit breaker must therefore open first, leaving no current in the line before isolation.
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