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adilmomin786
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Join Date: May 2010
Posts: 1

Electrical Formula

05/12/2010 9:38 AM

What is the formula to find voltage drop of cable as per british standard? Explain with example.
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Doorman
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#1

Re: Electrical

05/12/2010 9:52 AM

Looking at your two posts, I cannot help but wonder... What have you done with the money you were supposed to spend on textbooks?

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Crabtree
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#2

Re: Electrical Formula

05/12/2010 10:21 AM

You'll find it in the standard, Captain!

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Alanvaderi
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#3

Re: Electrical Formula

05/12/2010 1:17 PM

You dont need to know about this subject because you dont know it. A person worry about the voltage drop calculation must have the sources to find out and calculate it. Since you do not have such sources like text book, any other documents etc I beleive that you are not in a situation to calculate voltage drop. ( I am afraid to wonder that you are a fake certicate engineer)....and you need example also!!!!
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ieshiv
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#4

Re: Electrical Formula

05/12/2010 11:13 PM

Voltage drop formula at starting condition is

Vst = 1.732 x IL x (L/1000 x Nos. of runs of cable) x (R cos Ø (st)+ X sin Ø (st))

% Vst = (Vst x 100) / V

Where,
Cos Ø (st)Starting power factor ( In absence of vendor data, motor starting power
factor is considered 0.30.)
Sin Ø (st)Sine value of angle corresponding to starting power factor
V

st

Voltage drop during starting
I

L

Full load current in Amp.
LLength of cable in meters
RResistance of the Cable in Ohms per Km
XReactance of the Cable in Ohms per Km
VSupply voltage (415 V)

hope this will help......
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Alanvaderi
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#5
In reply to #4

Re: Electrical Formula

05/13/2010 5:02 AM

Friend, I understand from the question that looking for voltage drop formula. Not for motor starting voltage drop.
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ieshiv
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Join Date: May 2009
Posts: 40
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#6
In reply to #5

Re: Electrical Formula

05/13/2010 10:48 PM

Dear Alanvaderi,

This formula which i mention in my previous post is for any load ,load either motor or lighting...any type of load ,if we want to calculate the voltage drop than the above mention formula should be used ..............

If you know any other formula regarding voltage drop ,kindly share with us ....

Thanks in advance....
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