Southwire Voltage Drop determines proper wire size for an electrical circuit.
About Southwire Voltage Drop
Southwire Voltage Drop is a tools app developed by Southwire Company.
Download Statistics
Southwire Voltage Drop has been downloaded 140 thousand times. In the last 30 days, the app was downloaded 980 times.
User Ratings
Southwire Voltage Drop is rated 4.34 out of 5 stars. The rating is based on 250 ratings.
App Information
Southwire Voltage Drop is FREE to download. The APK download size is 5.18 MB. The latest version available is 3.2.4. The last update was on July 24, 2025.
Technical Requirements
Southwire Voltage Drop requires Android 8.0+ or higher. The app has a content rating of Everyone. The app has been available on Google Play September 2014.
Description
Southwire's voltage drop calculator will help you determine the proper wire size for an electrical circuit based on the voltage drop and current carrying capacity of an electrical circuit.
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Awesome, quick tool to use. Helps make the correct Calculations. Saves time and Money.
★★★★☆Jeff Stowasser· Mar 12, 2020
Spot on, except I wish the app gave an option to select insulation classes of conductors. Instead, it defaults to 60c insulation which is strange being that 75c is a typical spec. Just know your ampacity ratings of conductors, and base your selection off of the voltage drop. I.e... size 3 in the app is rated for 85A(60c), but I'm running size 3 THHN(90c) which is good for 115A.
★★★★★steven l· Dec 7, 2020
Just what is needed for quick field calculations for what size wire is needed to be pulled.
★★★★★Point Cross Beach RV Park· Nov 16, 2023
Must-have for all involved in electrical project for quick, accurate answers with a +/- standard deviation.
★★★★☆Merlin StWahgwaan· Aug 9, 2024
Very useful app! Very easy to explain and show a non-electrically inclined person why they have voltage issues under full load with long wire runs of insufficient gauge. Only suggestion would be, add split phase (dual phase) selections, as most of North America residential and small commercial power is 240v split phase, not just single phase 120v or three-phase as is available in the app now.
★★☆☆☆Eric Sillers· May 19, 2021
Okay, I guess. It would be better to see data presented in a table format. No default options for low voltages. And will not calculate wire sizes smaller than 14 AWG; an option to just type in the Cmil area would be nice.
★★☆☆☆Richard Hutchins· Jun 8, 2021
I don't know why the South wire app calculates a different result than the South wire website. Which one is right? Try, 60amp,copper, 3-phz, 60Hz,208v, conduit, 150ft run, min conductor and 3% allowable v-drop. Would be great otherwise.
★★☆☆☆Dan Hustad· Oct 20, 2020
Some of the ampacity tables are incorrect. 4/0 aluminum is listed as 205 amps at 75 degrees Celsius. In fact, it is only good for 180 amps at that temperature.
★☆☆☆☆Shayne H· Nov 12, 2021
Great App Bad Advice, I know you sell wire, but intentionally misinforming users about Table 310.15(B)(16) in the NEC isn't okay. You're not being conservative your intentionally misleading to sell larger wire. Fix and I will change my review, for voltage drop, ignoring wire size warnings, app works great.
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