LEGRAND KEOR T EVO, Installation & Operation Manual

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79
KEOR T EVO
Installa
tion & Oper
ation M
anual
THREE PARALLEL UNITS N+1 Redundant Configuration with Single Distribution Input
a1, a2, a3:
Mains 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 By pass 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.
Option o1, o2, o3= unit output disconnect switch to enable single unit complete shut down for maintenance
a, o, OS, Q should be 4poles unless TN-C distribution is used
In case we have parallel system with internal transformer; it is recommended to install output switches (o)
to enable sequential energizing of the different transformers.