28
a1, a2:
Mains Supply MCB 2p
d:
Distribution MCB
o1, o2
unit output switch 2p
NOTE:
Q4=
Internal Maintenance Bypass can be used when total load < single unit rating (kVA)
Option
o1, o2=
unit output disconnect switch to enable single unit complete shut down for
maintenance
a, o should be 2poles
In case we have parallel system with internal transformer; it is recommended to install input
switches (a) to enable sequential energizing of the different transformers.
Figure.5.4.5-2
1 + 1 Parallel Configuration
