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What is the faster way to calculate the drop voltage?

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Question added by AHMAD AL-KHATEEB , Sr. Electrical Eng. , Engicon
Date Posted: 2015/06/25
محمد صالح احمد السيد
by محمد صالح احمد السيد , مدير ادارة الوقاية و الاختبارات , شركة القناة لتوزيع الكهرباء

please re-ask the question this is design or actual measuring?

first, if ti is a design use cable manufacturer catalogue exactly to determine the maximum voltage drop.

second, if ti is an existing project use voltmeter to determine the actual voltage drop.

Deleted user
by Deleted user

Refer to the cable catalogue and multiply the specific resistance given for the specific cable with the length of the cable to get the voltage drop

Imtiaz Hussain
by Imtiaz Hussain , Electrical Engineer (Doha Metro Project) , Redco international

check the approved catalog for cables & approved branch loads for all the systems by knowning the Routing method, V.D cab be calculated very easily & in a Quick manner. Use ECODIAL by Schienider or DOCWIN by ABB for Advance calculation.

Perfecto Guintu
by Perfecto Guintu , SR.QAQC INSPECTOR (E&I) , MERCURY MENA ELECTROMECHANICAL ENGINEERING LLC.

"ohms to neutral per1,000 ft" is1.1 ohms. To complete the numerator, multiply as follows: (2 x0.866) x200 ft x1.1 ohms x20A =7620.8 Dividing7621 by1000 ft gives a voltage drop of7.7V. This drop is acceptable for our480V circuit. A No.12 would drop11.8V. Boost the length to500 ft, and that No.10 drops18V; the No.12 drops29V.

Maher Hattab PMP
by Maher Hattab PMP , Electrical Engineer, PMP® , KAUST

check the technical catalog of the cable manufacturer, they give you  the voltage drop per length unit, just multiply it with your actual cable length 

wadei amr
by wadei amr , Maintenance Manager , Central Trading Company

reading the cable manufactorer catalogue/data sheet 

Chadi Yacoub
by Chadi Yacoub , Senior Electrical Design and Product Engineer , MATELEC S.A.L.

Use Ecodial Free Software from Schneider

Ralph Parkes
by Ralph Parkes , Site Supervisor , Group Five

There is a formula you can apply to determine this

HARSHA KUMAR HIRIYURSUBRAMANYAM
by HARSHA KUMAR HIRIYURSUBRAMANYAM , Production Manager , LOAD CONTROLS INDIA PVT LTD

 

A current source has its voltage defined by its load. V=IZ.A voltage source has its current defined by its load. I=V/Z.

 

Fathy Samaha
by Fathy Samaha , Sr. Electrical engineer , Al-Hussan Engineering Consultants (HEC)

one of cable characteristic is voltage drop as mV/A.m, obtained from cable datasheet, multiplying this value in the actual length and in demand current ( net current after taking all design factors into account).

Hassan Mahmoud Mostafa Harb
by Hassan Mahmoud Mostafa Harb , Senior Sales and presales engineer , German Technical Services Co. "GTS"

go through this link

http://www.calculator.net/voltage-drop-calculator.html?material=copper&wiresize=8.286&voltage=24&phase=dc&noofconductor=2&distance=50&distanceunit=meters&amperes=10&x=38&y=10

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