Answer / appar

above mentioned is ok. we should take distance also in an
account bcoz if there is a long length cable voltage drop
is also increase for that we increase the sqmm of the
cable..

Answer / sreenu

Based on KW/HP value the current rating can be caluculated
and based on current rating of Mains & cable size can be
caluculated.

for example.
HP of the motor is :A HP
KW of load is :A HP/735.5*Efficiency(E).
Generally eddicieny of the motor can be asuumed 0.8 to 0.9
Current(C) is :A HP/735.5*E*(1.73*V* cosQ)
Cos Q generally asumed as 0.8 to 0.9

If the value of current is C, the current capacity of cable
reuired is Appx. 1.5*C.

Based on cable catalogue provided by the cable manufacturer
the size of the cable can be selected.

For eample. If you use al. cable, the size of cable is
bigger than copper cable.

Rating of mains: 1.5* C, but fuse arting is C only.

L.A. (Lightening Arrester) is located at a place from where transmission line enters the transmitting substation. So L.A. (Lightening Arrester) is the first equipments which has to encounter with lightening, high voltage surges and switching surges. It has to absorb energy of lightening, high voltage surges, and switching surges. L.A. (Lightening Arrester) is made up of layers of semiconductors. If these layers can not tolerate energy released by lightening, high voltage surges, and switching surges the L.A. (Lightening Arrester) blasts.

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