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Schemes

Access Arrangements
Some Typical Key Interlock Schemes
Precipitator Interlocks (ESP)

Please click the thumbnails for full size drawings and complete operating procedures.

Scheme A Scheme A: To prevent the paralleling of two independent sources.

Scheme A1 Scheme A1: To prevent the paralleling of any of the sources.

Scheme B Scheme B: To prevent the opening of the non-load break disconnect switch while the breaker is closed.

Scheme B1 Scheme B1: To prevent the opening of the non-load break disconnect switch while the breaker is closed; insuring the disconnect switch is locked open before the breaker can be re-closed for testing or servicing.

Scheme C Scheme C: To prevent the opening of the non-load break disconnect switch while the breaker is closed; insuring the disconnect switch is locked open by the removal of and evidence/hold-off/ breaker test key.

Scheme D Scheme D: To prevent the opening of the non-load break disconnect switches while the breaker is closed; insuring the disconnect switches are locked open and the breaker isolated by the removal of and evidence/hold-off key, or using the evidence/hold-off key for testing/servicing of the breaker.

Scheme E Scheme E: To prevent the opening of the non-load break disconnect switches while the breaker is closed; insuring the disconnect switches are locked open and the breaker isolated by the removal of and evidence/hold-off key, or using the evidence/hold-off key for testing/servicing of the breaker. Requiring an initiation key to release the breaker for operation and begin the switching scheme.

Scheme F Scheme F: To prevent access to the disconnect switch enclosures while the breaker is closed.

Scheme G Scheme G: To prevent the operation of the non-load break disconnect switch while the breaker is closed. Insuring the fuse compartment is isolated before it can be accessed.

Scheme H Scheme H: Preventing the paralleling of two independent sources through the tie breaker while allowing the switching of sources to the load(s).

Scheme H1 Scheme H1: Preventing the paralleling of two independent sources through the tie breaker while allowing the switching of sources to the load(s).

Scheme H2 Scheme H2: Preventing the paralleling of any of the sources while allowing the switching of the loads to alternate sources.

Scheme K Scheme K: To prevent the operation of the non-load break disconnect switch while the breaker is closed and preventing access to the breaker enclosure with the switches closed.

Scheme L Scheme L: To prevent the paralleling of lines #1 and #2; performing the operation of switches #1 and #2 under no-load conditions.

Scheme M Scheme M: To prevent the operation of switch #1 with breaker #1,2,3,4 closed.

Scheme N Scheme N: To prevent the paralleling of lines #1 and #2; performing the operation of switches #1 and #2 under no-load conditions.

Scheme O Scheme O: Preventing the paralleling of any of the lines while allowing the switching of the loads to alternate sources.

Scheme P Scheme P: Preventing the paralleling of any of the lines while allowing the switching of the loads to alternate sources.

Scheme R Scheme R: To prevent the paralleling of lines #1,2,3 through a common tie bus.

U.P.S. System Key Interlock System U.P.S schemes 1 & 2: To insure the proper sequential operation of UPS related equipment.
Printable Specs No. 1
Printable Specs No. 2

Capacitor Bank Access Scheme Capacitor Bank Access Scheme: To prevent closure of the ground switch under load and ultimately gain access to the capacitor bank area after the capacitor bank has been grounded and fully discharged.



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