Which of the following correctly represents the sequence of operations of isolator, circiut breaker and earthing switch while opening a circuit?

• A. Open circuit breaker-open isolator-close earthing switch
• B. Close earthing switch - open ciruit- breaker-open islotor
• C. Close circuit breaker-close isolator - open earthing switch
• D. Open isolator close circuit breaker-open earthing switch

Answer: (A)