Answer / ramesh kumar k

the size of the cable depends upon the material used in the
cable...

if u go for copper cable... the copper has got the current
carrying capacity of 2A/sq.mm continuously with out
overloading effect. so if you want for 550A,

550/2 = 225 sq.mm copper cable u have to use...

i think it is 1.2A/sq.mm for Aluminium...

550/1.2 = 458 sq.mm Aluminium cable u have to use...

like this.... the current carrying capacity is different
for different materials...

Answer / dilip singh

Normally if you go with the size of cable in catalogue, you
will observe the if cable is of 400sqmm thenit carries
about 300A current and similarly for other ratings so you
can guess by size of cable selected. but it will not be
correct all the time. may it will vary by some value.

Answer / u.chandarasekar

It is very vert Hard Question for me i never know the
answer.
In 28 Years exp. first time i face this kind of qus. That's
a main reason BGR Energy Terminate me.

Answer / s.manikandan

we are know the formula R=Pl/A. P - resistivity of copper or
Aluminium, L - Length of wire,A - Area of wire, and We use
I=V/R formula

Answer / sk

In copper cable 1sq.mm equals to 4 amps so 150sqmm*4 amps that equals to 600 amps , and we will be in safer side

Answer / syed masood

t he cable size depends upon the ams rating but the cables size defined standard value the ams rating enclosed this values some values 2.5,4,6,10,......630
first you have to know full conductor size standard value
then you calculate cable size depends upon the ams by using this relation cu=2-5ams per sq.mm
al=1.2-2ams per sq.mm
4 guage for 125-150ams convert guage into mm
from kadayanallur syed masood electrical engineer
national college of engineering

Answer / amit

u van not get tha exact size of cable widout catalouge

Answer / binay agrawal

generally, for low rating full load current should be 3
times for aluminium cable, & 4 times for copper cable.
so, here 550/4=137.5 sq mm,
also 550/3=183.33 sq mm.
but this is for low rating, in high rating ratio is
decrease,
i.e. for copper 550/3= 183.33 sqmm
& for aluminium 550/2= 275 sq mm.

Can we connect two CT'S to one energymeter?

1 Answers   KSEB,

what is mean by NTPC?,why didn't electric shock in train?

7 Answers  

How can we calculate the Rating of DG Set for a 4 kw motor?

3 Answers  

how are reversing the direction of rotation of dc motor

0 Answers  

How we can calculate the capacity the Air Condition capacity? like 1 or 1.5 ton's, What is the means of volume of Ton's in capacity of Air Compressor? Why in ton's,? not any other Volume?

2 Answers  

Kindly Tell me name of the book for electrical estimation and costing ,calculation or web site to download

1 Answers   ABB,

I WOULD LIKE NOW WHY WE CANT USE SOME CT FOR MESARING AND PROTECTION

2 Answers  

Why we are going for converter transformers for DC drives application instead of distribution transformer?

0 Answers  

wht d.c produces corrosion

1 Answers  

how we test a 3 phase motor on single phase supply....? HOW WE RUN A 3 PHASE MOTOR ON SNIGLE PHASE. supply for testing..? how we verify of a 3 phase motors 6 wire & name thame a1/a2/a3..b1/b2/b3 and c1/c2/c3 for connecting star delta starter ........i have only 1 phase supply ? help forum..........

1 Answers   Enercon,

i have to install a HT panel, what components, I have to use in this and what will the diagram of that diagram,please tell me each and everything.

0 Answers  

what is XF 200/240 V AC for Drawout Breaker.

1 Answers