In order to switch-off and EHV circuit for maintenance, the following sequence is adopted:

In order to switch-off and EHV circuit for maintenance, the following sequence is adopted: (1) Open the circuit breaker, open the isolator, operate the earth switch (2) Operate the earth switch, open the isolator, open the circuit breaker (3) Open the isolator, operate the earth switch, open the circuit breaker (4) Open the isolator, open the circuit breaker, operate the earth switch 
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In order to switch-off and EHV circuit for maintenance, the following sequence is adopted: (1) Open the circuit breaker, open the isolator, operate the earth switch (2) Operate the earth switch, open the isolator, open the circuit breaker (3) Open the isolator, operate the earth switch, open the circuit breaker (4) Open the isolator, open the circuit breaker, operate the earth switch 

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