Re3TM Concentric Neutral Calculator

Re3TM Concentric Neutral Calculator for Utilities and Renewables

Calculate your best concentric neutral configuration for Medium Voltage Cables based on ICEA S-94-649 standard for Utility and Renewable (Solar, Wind, BESS) applications.
Copyright © 2023 Southwire Company, LLC. All rights, including distribution, are reserved. This material is provided with the permission of Southwire Company. Internal use of this material is permitted. However, permission to reprint/republish/distribute this material, underlying data, or its calculated results for other or external purposes or for redistribution must be obtained from Southwire Company by writing to Southwire Legal at By choosing to view this document, you agree to all provisions of the copyright laws protecting it.
Voltage Drop Calculator
Helps determine the proper wire size for an electrical circuit based on the voltage drop and current carrying capacity of an electrical circuit.
Conduit Fill Calculator
Conduit Fill is the percent of area inside the conduit taken up by the cable(s). Provides quick and easy results for the  conduit fill percent, per NEC® guidelines.
Re3™ VFD Cable Selector
Select the properly sized VFD cables for your specific installation based on application temperature, drive horsepower, and operating voltage.