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Interlock Application - Rectifier Access

Scheme # 43
To prevent opening any rectifier enclosure door while the rectifier is operating.

Simple rectifier scheme with “daisy chained” door lock arrangement. Any quantity of rectifier access doors can be accommodated.

Breaker A is normally closed. Key A-1 is held in the L-O interlock on breaker A. Keys A-2, A-3, and A-4 are held in L-C interlock (Type M2D) on rectifier enclosure access doors #1, #2 and #3 respectively. All rectifier enclosure access doors are locked closed.

To gain access to the rectifier enclosure, proceed as follows:

Reverse sequence to restore service.

Note: As an additional precaution, the Type D and M2D door interlocks can be supplied with auxiliary contacts wired to the breaker trip circuit.

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