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Contents | Introduction | Symbols Legend | Scheme Book

Interlock Application - Isolating Switches and Breaker
Scheme # 7
To prevent operation of disconnect switch A when breakers B, C, D and E are closed. Breakers must be opened in pre-arranged sequence.

NOTE: Electrical circuit is equivalent of Scheme 6.

Interlock Application Scheme # 6 - Isolating Switches and Breaker

Disconnect A and breakers B, C, D and E are shown in closed position. Key A-1 is held in breaker B interlock, key A-2 is held in breaker C interlock, key A-3 is held in breaker D interlock and key A-4 is held in breaker E interlock. Key A-5 is held free in breaker E interlock or is retained by supervisor.

1.
2.
3.


4.
5.


6.
7.


8.
9.


10.

11.
12.

13.

14.
15.

16.
17.

18.
19.


20.

 Obtain key A-5 from supervisor.
Open breaker E.
Insert key A-5 in L-O interlock on breaker E and turn
key A-4 to lock open. Key A-5 is now held. Key A-4 is
now free.
Open breaker D.
Insert key A-4 in L-O interlock on breaker D and turn
key A-3 to lock open. key A-4 is now held. key A-3 is
now free.
Open breaker C.
Insert key A-3 in L-O interlock on breaker C and turn
key A-2 to lock open. Key A-3 is now held. Key A-2 is
now free.
Open breaker B.
Insert key A-2 in L-O interlock on breaker B and turn
key A-1 to lock open. Key A-2 is now held. Key A-1 is
now free.
Insert key A-1 in L-O-C interlock on disconnect A and
turn to unlock. Key A-1 is now held.
Open disconnect A.
Turn key A-1 in L-O-C interlock on disconnect A to
lock open. Key A-1 is now free.
Insert key A-1 in L-O interlock on breaker B and turn to
unlock. Key A-1 is now held and key A-2 is now free.
Breaker B may now be operated for servicing.
Insert key A-2 in L-O interlock on breaker C and turn to
unlock. Key A-2 is now held and Key A-3 is now free.
Breaker C may now be operated for servicing.
Insert key A-3 in L-O interlock on breaker D and turn to
unlock. Key A-3 is now held and key A-4 is now free.
Breaker D may now be operated for servicing.
Insert key A-4 in L-O interlock on breaker E and turn to
unlock. Key A-4 is now held and supervisor Key A-5 is
now free.
Breaker E may now be operated for servicing.

Reverse sequence to restore service.

Links for more interlock application scheme information:

Contents | Introduction | Symbols Legend | Scheme Book

Scheme # 25
Scheme # 26
Scheme # 27 Scheme # 28
Scheme # 29
Scheme # 30
Scheme # 31
Scheme # 32
Scheme # 33 Scheme # 34
Scheme # 35
Scheme # 35A
Scheme # 36

 Scheme # 37
Scheme # 38 Scheme # 39
Scheme # 40
Scheme # 41
Scheme # 42
Scheme # 42A
Scheme # 42B
Scheme # 43
Scheme # 43A
Scheme # 44
Scheme # 45
Scheme # 45A
 
   

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