Phase wise Load Distribution may possibly during Final DB (Distribution Board) wiring. Equally load distribution in final DB or physically load connection to an electrical circuit is important to keep the load balanced in each of three phases.
Importance of Load Distribution in Final DB

RCD for Earth Leakage Protection
Earth Leakage: Electricity is carried by conductors that are supported above the earth or inside the earth but are electrically isolated by insulators which prevent the electricity from neutralizing itself as it would if it shorted to earth. However, there is some very small leakage across these insulators, especially aerial insulators during wet or humid conditions. This is called earth leakage.
RCD for three phase system should have a residual current device (RCD-TP) of sensitivity not exceeding 100 mA. If there is no three phase load in the installation, it is better to use three units (RCD-SP) of single phase RCCBs be installed. This will reduce the interruption when single phase fault occurs.
RCD for three phase system should have a residual current device (RCD-TP) of sensitivity not exceeding 100 mA. If there is no three phase load in the installation, it is better to use three units (RCD-SP) of single phase RCCBs be installed. This will reduce the interruption when single phase fault occurs.
Properly rated Residual
Current Devices (RCD) must be used for protection from earth leakage currents
to prevent electric shocks. For power circuit RCD sensitivity should be 30mA,
for sensitive load like water heater RCD sensitivity should be 10mA.
Any
place of public entertainment, children school, where the floor is likely to be
wet or where the wall or enclosure is of low electrical resistance, protection
against earth leakage current must be provided by a RCD of sensitivity 10mA.
Any
hand-held equipment, apparatus or appliance installation must ensure protection
against earth leakage current provided by a RCD of sensitivity 30mA.
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Main and Earth Conductor and Accessories
For
light circuit load should keep within 1800 watts, if contactor control is use
for lighting circuits, loading may be increased to 7 KW per circuit. Both of
main and earth conductor should be same sizes, normally used sizes are 1.5
& 2.5 sqmm cable.
For
connection between the ceiling rose and lamp holders for pendant type light
fittings should be used heat resisting flexible cords, this cords may insulated
with butyl rubber, EP, rubber, silicone rubber or glass fiber.
Typically
used Circuit Breaker (CB) capacity for final circuit is 6A, 10A, 16A etc.
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