In case of large multi stored building the most economical distribution
system is
Single
phase system
3-phase
3-wire system
3-phase
4-wire system
2-phase
system
3-phase
4-wire system
In
case of large multi-stored building the cost economical distribution system is
3 phase 4-wire system. Because by this we can distributes the voltage properly
with one phase and neutral.
Hence,
the correct option is (C).
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