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How to calculate cable size || Cable calculation formula with example

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How to calculate cable size || Cable calculation formula with example

234,248 views October 28, 2019 3:36

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ChannelBe An Engineer

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How to calculate cable size:

First we must know these three values:
Load - ?
Voltage - ?
% efficiency - ?

Example:
Load (P)=1 kW
Voltage=230 V
% Efficiency=80%

Answer:
Formula-
P = V x I x CosØ x efficiency %
1000 = 230 x I x 0.8 x 0.8
I = 6.79 A

Every Motor have Voltage drop avg.=2%
Voltage drop=6.79 x 2%
=0.1358 A
Total Current=6.79+.135
= 7 A

For Al Cable:
1 sqmm =1.5 A
So
7 A = 1/1.5 x 7
7 A = 4.66 sqmm.

For Cu Cable:
1 sqmm = 2.5 A
So
7 A = 1/2.5 x 7
7 A = 2.8 sqmm.

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About this tutorial

Be An Engineer published this 3:36 video tutorial on October 28, 2019. It has been watched 234,248 times on YouTube.

Category
Education
Duration
3:36
Published
October 28, 2019
Views
234,248
Likes
3,109

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