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Voltage drop spreadsheet

The following voltage drop calculations were all based on the resistance values in Table 8 Chapter 9 of NEC (National Electrical Code). This spreadsheet only considers voltage drop.

Voltage Drop Calculations
Voltage Drop Calculations

Many other factors affect wire size. Please refer to entire NEC when sizing wire. Spreadsheet has three sheets beside main one with calculations:

  • Printable VD calculations
  • Printable Table Parallel wires
  • Printable Table 310-16
Software:Voltage Drop Calculator – Albany Technical College
Version:28.8.2004
Developer:Albany Technical College
Size:545 kB
Price:Free
Download:Right here | Video Courses | Membership | Download Updates
Voltage drop calculations
Voltage drop calculations

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6 Comments


  1. pipat
    Jan 22, 2020

    I need the maximum power supply length of each circuit


  2. Amr Ahmed
    Dec 04, 2019

    thank you


  3. dessouky samak
    Nov 21, 2019

    l need change voltage please
    vaiable voltage


  4. Dharmendra
    Feb 12, 2017

    The formula for minimum voltage drop is not correct.how is possible for 240v supply and 228v drop


  5. Huned
    Dec 29, 2012

    The derating factors need to be included as a part of installation, also need to check for motor [running / starting] application.


  6. dsaint
    Nov 26, 2012

    Has anyone updated this program? I’ve been using it for a while and really like the way it works, but I’d love to have it updated for NEC 2008 & 2011..

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