Answer / chandru_williams

bus bars are current carrying device which enables the user
to tap various points from a single point source.This
beccomes difficult in the case of cables.Incoming breakers
are devices ( VCB,ACB etc....) which makes or breaks the
entire circuit in a panel. Out going breakers are those
breakers which breaks or makes the feeder circuits from the
main circuit.

Answer / prashant

from the main distribution panel (MDB)the cables are taken
to the various SUB MAIN DISTRIBUTION PANELS (SMDBs)located
in the various typical floors or other locations. Normally
we can use cables for this purpose but in situation swhere
the the building is more than 15 - 20 floors it is more
economical to use BUSBARS.Busbars are nothing but CU
conductors and normally one RYBN section ( 4 poles but
actually neutral is only half ie, 3.5 poles )can feed up to
8 - 9 floors. In every floor there will be a tap off box
from where normal cables are used to till the SMDBs.
A breaker is sed to break the circuit in case of any faults
or for maintenance purposes. Incoming braeker is one which
is given before the transformer side and the outgoing
breaker is given after the transforemer side ( ie secondary
side ) Normally in case of maintenence we can only turn off
the outgoing breaker

Answer / jamshid al rahman

bus bars are current carrying conductors which enables the transmission of high power and to tap various points from a single point source.Commonly this are made of hollow pipe because AC voltage has a tendency to accumulate the flow of current at the outer surface due to skin effect.

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