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Contents | Introduction | Symbols Legend | Scheme Book

Interlock Application - Prevent Paralleling of Lines
Scheme # 14
To prevent paralleling of lines A and B. Two loads, fed from either source (one tie-breaker). To prevent operation of disconnect switch D when breaker A is closed. To prevent operation of disconnect switch E when breaker B is closed.

Interlock Application Scheme # 14 - Preven Paralleling of Lines

Disconnect switches D and E and breakers A and B are closed. Breaker A closed to supply load M. Breaker B closed to supply load N. Tie-breaker C is open. Keys A-1 and A-2 are held in interlock on breaker A. Keys A-1 and A-3 are held in interlock on breaker B. Tie-breaker C cannot be closed until either breaker A or B is locked open.

To transfer load N to breaker A:

  1.
2.

3.

4.
 Open breaker B.
Turn key A-1 in L-O interlock on breaker B to lock open. Keys A-1 and A-3 are now free.
Insert key A-1 in L-O interlock on tie-breaker C and turn to unlock. Key A-1 is now held.
Close tie-breaker C.

Reverse sequence to restore service through breaker B. Load M can be supplied through breaker B in a similar manner.

To service breaker B:

  1.
2.

3.

4.
5.

6.
Open breaker B.
Turn key A-1 in L-O interlock on breaker B to lock open. Keys A-1 and A-3 are now free.
Insert key A-3 in L-O-C interlock on disconnect E and turn to unlock. Key A-3 is now held.
Open disconnect E.
Turn key A-3 in L-O-C interlock on disconnect E to lock open. Key A-3 is now free.
Return key A-3 to L-O interlock on breaker B and unlock for operation of breaker during servicing.

Reverse sequence to restore service. Breaker A can be serviced in a similar manner.

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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