The Construction Monkey Conductor calculator lets you figure out electrical characteristics
of wires including the ampacity, circular mills, area, resistance, reactance, impendance, conduit fill, and voltage drop.
Make your selections below and the form will automatically update the values.
Full Conductor Properties
Max Voltage Drop
2% Voltage Drop
3% Voltage Drop
5% Voltage Drop
Good design practices limit wire ampacity due to over current to 80% of rated ampacity under most circumstances.
The wire size will not be able to handle this load and it will cause catastrophic failures.
Good design requirements should limit overall voltage drop to less than 5%.
1Ampacity based NEC Table 310-16, which is based on three (3) current carrying conductors at 30 degrees Celsius Ambient
2Calculations based on 0.85 Power Factor
3Based on NEC Table 9
4Check Conductor derating Factors for more than three (3) current carrying conductors
5Load for Voltage Drop is calculated based on 80% ampacity load of maximum allowable ampacity
No guarantees are made as to the accuracy of the calculation or compliance with
local codes. Verify all calculations with a professional engineer. If you
find an error, or have a suggestion, please send us an email.