Please click the thumbnails for full size drawings and complete operating
procedures.
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Scheme A: To prevent
the paralleling of two independent sources.
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Scheme A1: To
prevent the paralleling of any of the sources.
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Scheme B: To
prevent the opening of the non-load break disconnect switch while the breaker
is closed.
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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.
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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.
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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.
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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.
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Scheme F: To
prevent access to the disconnect switch enclosures while the breaker is
closed.
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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.
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Scheme H:
Preventing the paralleling of two independent sources through the tie breaker
while allowing the switching of sources to the load(s).
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Scheme H1:
Preventing the paralleling of two independent sources through the tie breaker
while allowing the switching of sources to the load(s).
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Scheme H2:
Preventing the paralleling of any of the sources while allowing the switching
of the loads to alternate sources.
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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.
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Scheme L: To prevent the paralleling
of lines #1 and #2; performing the operation of switches #1 and #2 under no-load conditions.
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Scheme M: To prevent the operation
of switch #1 with breaker #1,2,3,4 closed.
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Scheme N: To prevent the paralleling
of lines #1 and #2; performing the operation of switches #1 and #2 under no-load conditions.
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Scheme O:
Preventing the paralleling of any of the lines while allowing the switching
of the loads to alternate sources.
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Scheme P:
Preventing the paralleling of any of the lines while allowing the switching
of the loads to alternate sources.
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Scheme R: To prevent the paralleling
of lines #1,2,3 through a common tie bus.
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U.P.S schemes 1 & 2:
To insure the proper sequential operation of UPS related equipment.
Printable Specs No. 1
Printable Specs No. 2
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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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