Online Calculators and Tables to Help You Determine Proper Wire Size


The Circuit Distance Calculator calculates the maximum circuit distance based on the maximum percent voltage drop. This calculator also calculates the voltage drop and the resulting voltage at the load.

Circuit Distance Calculator


Enter the information below to calculate the appropriate wire size.









Results
Maximum Circuit Distance -
Voltage Drop -
Voltage at Load -

Note: The results of this calculator are based on conductor temperatures of 75°C.

Source: NFPA 70, National Electrical Code, Chapter 9, Table 8

To calculate voltage drop based on circuit distance, use the Voltage Drop Calculator.


To properly size wire for various applications, use the Wire Size Calculator to determine proper conductor sizing. Visit the Tables page to view reference tables such as Maximum Ampacity for Current-Carrying Conductors.


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