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THREE PARALLEL UNITS N+1 Redundant Configuration with Dual Distribution Input
a1, a2, a3:
Mains Supply MCCB 4p
b1, b2, b3:
Auxiliary Supply MCCB 4p
d:
Distribution MCCB
o1,
o2, o3 unit output switch 4p
OS:
General output switch 4p
Q:
External Maintenance Bypass MCCB 4p
NOTE:
Q=
External Maintenance Bypass MCCB
OS =
general output disconnect switch
Rating = N X unit rating (kVA)
Internal Maintenance Bypass Q3 cannot be used should be locked to avoid any misuse.
o1, o2,
o3= unit output disconnect switch to enable single unit complete shut down for maintenance
Option
a, b, o, OS, Q
should be 4poles unless TN-C distribution is used
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