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Contents | Introduction | Symbols Legend | Scheme Book

Interlock Application - Prevent Paralleling of Lines
Scheme # 12
To prevent paralleling of lines A and B. Single load, fed from either source. To prevent operation of disconnect switches A and B when breaker C is closed.

Interlock Application Scheme # 12 - Preven Paralleling of Lines

Breaker C and disconnect A are shown in closed position. Disconnect B is shown in open position. Key A-1 is held in breaker C interlock. Key A-2 is held in L-O interlock on disconnect A.

To service breaker:

  1.
2.

3.

4.
5.

6. 		Open breaker C.
Turn key A-1 in L-O interlock on breaker to lock open. 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.
Return key A-1 to breaker interlock and unlock for operation of breaker during servicing.

To transfer load from line A to line B:

  1.
2.

3.

4.
5.


6.

7.

8.
9.

10.

11.
Open breaker C.
Turn key A-1 in L-O interlock on breaker to lock open. 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 and key A-2 in L-O interlock on disconnect A to lock open. Keys A-1 and A-2 are now free.
Insert key A-1 in L-O-C interlock on disconnect B and turn to unlock. Key A-1 is now held.
Insert key A-2 in L-O interlock on disconnect B and turn to unlock. Key A-2 is now held.
Close disconnect B.
Turn key A-1 in L-O-C interlock on disconnect B to lock closed. Key A-1 is now free.
Insert key A-1 in breaker interlock and turn to unlock. Key A-1 is now held.
Close breaker.

Reverse sequence to restore service through line A.

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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