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.

how kva rating of transformer is calculated.

6 Answers   Fluor Daniel, Siemens,

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How can we calculate the rating of a transformer suppose if load is 1000KW?Formula?

3 Answers  

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which transmission is cheaper ac or dc?

10 Answers  

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what is the difference between a feeder and a cable?

3 Answers  

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1)how many types of earth? 2)how many types of megger and how to select that range? how much time taken for megger calibration( we r using megger)

1 Answers  

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why core of transformer in square or rectangular why not in circle or ellipse if this what happens

2 Answers  

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How much ph is maintained of water electrolyte which is used in LRS for 1200 kw slipring induction motor ?

0 Answers   AMS, JK Lakshmi Cement,

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In a overhead system why the voltage between line &ground is taken for basic comparison ?and in case of underground cables the comparison take only by the voltage between cables?

1 Answers   L&T,

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2 Answers   Jindal, JSW,

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Operation carried out in thermal power stations?

0 Answers  

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What is the IS standard for MCCB to be use (As per capacity of AMP)& for ACB also.

0 Answers  

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what will happen if i will done heart shape hole in transformer core?

1 Answers   Bhel, ONGC,

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