How to calculate the Sizes of the cable required for one specific load? Is the

How to calculate the Sizes of the cable required for one
specific load? Is there any formula for that? ( EX: For
400KW load,50mtr Length, What is the LT cable Size
required?)

Question Posted / ramsel1985

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How to calculate the Sizes of the cable required for one specific load? Is there any formula for t..

Answer / habeebm

Yes we have formula.....

Power P =400KW, Length L =50 Mtr, Voltage V =415V

ANSWER:-------

First find current,

Current I= 695.65A

Apply the factors in the below mentioned formula:-

R = pL/a

Where R=Resistance, p=Resistivity, L=Length, a=Area

Since p=12 for Aluminiun and 14 for Copper.

Then, R= pL/a

We know that V=IR

Apply "R" in Ohms Law

V = IR

V = I pL/a

Therefore ,

Area "a"= (IpL/V) / 1.732 (since 3 phase)

a = (695.65 x 12 x 50 / 415)/1.732

a = 580.69 ( Approximately 600 Sq.mm )

a = 600 ( 2 x 300 Sq.mm)

Therefore 2R, 3.5C X 300 Sq.mm cable is required.

Is This Answer Correct ?

7 Yes

2 No

How to calculate the Sizes of the cable required for one specific load? Is there any formula for t..

Answer / noob

wat does 2R mean?
how did u get V = 415v?
50 meters is the length of wat?
the wire? the load?

Is This Answer Correct ?

2 Yes

1 No

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