how calculate cable size in squre mm, when the load is given by in kw? do u ha

how calculate cable size in squre mm, when the load is
given by in kw? do u have current rating chart of elctrical
cables?

Question Posted / kumar

4 Answers
12526 Views
I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

how calculate cable size in squre mm, when the load is given by in kw? do u have current rating ch..

Answer / sindhejs

With knowing the kW rating and voltage, the current can be
calculated as I=P/(sr(3)*V*pf). The pf can be assumed to be
as 0.8. After knowing the current, choose the 10% higher
current carrying capacity cable for the safety purpose.

current rating for differnt cables are different for same
size.Copper has higher current carrying capacity.

Is This Answer Correct ?

10 Yes

2 No

how calculate cable size in squre mm, when the load is given by in kw? do u have current rating ch..

Answer / moh. baheer

We can so easy calculate the current and choose the cable
size form chart if we have the quantities of Voltage (Volt)
and total power (KW) please find from this formula the
current rate according to the load (kW).
P = U*I*cosФ
I = P/U =?
Then we can choose the cable size from chart according to
current.
Regards

Is This Answer Correct ?

4 Yes

1 No

how calculate cable size in squre mm, when the load is given by in kw? do u have current rating ch..

Answer / shahidul islam (srabon)

When the power is known in kW then the formula for knowing
the current in A is I=(P/(sr(3)*V(phase)). Now we the
current. After finding the current we know that the current
density of copper is 2.5. Finally to calculate the cable
isze we apply the given formula in practice.
I=A*2.5
so, A=I/2.5 (in square mm)
Where A=Area of conductor or here cooper is used
A=w*l
w=width
L=length of the conductor
Hope the answer of the question

Is This Answer Correct ?

2 Yes

2 No

how calculate cable size in squre mm, when the load is given by in kw? do u have current rating ch..

Answer / abdul rahman

While all loads are given in KW,only current matters while calculating cable sizing assuming voltage remains constant neglecting minor fluctuations.
From power equation once u find the load current you decide the cable sizing.As a thumb rule 1sq mm of Cu carries 2.4A whereas Al carries 1.4A.
For example a 100kw load requires nearly 180A current.The cable sizing would be 4core X 95 sqmm Cu plus 1core 50 sqmm ECC.
Different manufacturers have their standard sizes hence the value main differ slightly but the thumb rules will help u.

Is This Answer Correct ?

0 Yes

0 No

Post New Answer

More Electrical Engineering Interview Questions

when the PFR (POWER FACTOR REGULATOR)change a step to zero,one of the RCCB will triped off,is it the changing step of this PFR effect the RCCB?

2 Answers

transformer spections :: input voltage 0-110-230v; output volage 0-10-12-14v; amp=3A using CRNO CORE, capcaity=50VA primary turns = ? ; secondry turns =?

0 Answers Bhel,

The D.C. spark test is applicable to single conductor cable & assemblies of insulated single conductor cables without insulation shield,metallic sheath or metalic armor?

0 Answers

what is the function of a circuit breaker ?how does the circuit breaker function during normal operation of an electrical system

2 Answers

WHY MOSTLY BATTERY VOLTAGE IS IN MULIPLE OF 2 LIKE 2V,4V,8V,16V,18V....

2 Answers Exide,

which motor is used in mixies

10 Answers

What is the role of ESP(Electro Static Precipitator)in steam power plants? Where it is located? How it works?

1 Answers

Q. calculate the value of the resistor to be connected in series with a 100W; 230V lamp so that the wattage of the lamp is reduced to 35W

8 Answers

what is the difference between a hooter and a mcp