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Contents | Introduction | Symbols Legend | Scheme Book

Interlock Application - Prevent Paralleling of Lines
Scheme # 19
To prevent paralleling lines A, B, C, and D. Four loads fed from any source (four tie-breakers).

Interlock Application Scheme # 19 - Preven Paralleling of Lines

Breaker A is closed to supply load M. Breaker B is closed to supply load N. Breaker C is closed to supply load P. Breaker D is closed to supply load R.

Keys A-1, B-1, C-1, and D-1 are held in L-O interlocks of breakers A, B, C, and D. Tie breakers E, F, G, and H are locked open. Breaker E interlock has a master or apartment lock and can be unlocked with either key A-1 or B-1. Breaker F interlock has a master or apartment lock and can be unlocked with either key B-1 or C-1. Breaker G interlock has a master or apartment lock and can be unlocked with either key C-1 or D-1. Breaker H interlock has a master or apartment lock and can be unlocked with either key A-1 or D-1.

To transfer load M from breaker A to breaker B:

  1.
2.

3.

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

Reverse sequence to restore service through breaker A.

To transfer load M and N from breaker A and B to breaker C:

  1.
2.
3.

4.

5.
Close tie-breaker E as above.
Open breaker B.
Turn key B-1 in L-O interlock on breaker B to lock open. Key B-1 is now free.
Insert key B-1 in L-O interlock on tie-breaker F and turn to unlock. Key B-1 is now held.
Close tie-breaker F.

Reverse sequence to restore service (M and N) through breakers A and B.

 To transfer load R from breaker D to breaker C:

  1.
2.

3.

4.
 Open breaker D.
Turn key D-1 in L-O interlock on breaker D to lock open. Key D-1 is now free.
Insert key D-1 in L-O interlock on tie-breaker G and turn to unlock. Key D-1 is now held.
Close tie-breaker G.

Reverse sequence to restore service through breaker D.

To transfer load M from breaker A to breaker D:

  1.
2.

3.

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

Reverse sequence to restore service through breaker A.

Any of the loads M, N, P, or R can be transferred from its own supply to any adjacent supply.

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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