Voltage Drop Calculator

This voltage drop calculator is applicable only to NEC applications. It does not optimize conductor sizes for several different loads at various points in a circuit. The total combined load and length of the circuit must be used. Consult with an engineer if your application does not fit into one of the following categories and/or requires more complex engineering calculations.
» Voltage Drop Calculator

Conductor Properties

These resistance values are valid ONLY for the parameters as given. Using conductors having coated strands, different stranding type, and especially, other temperatures chances the resistance.
» Conductor Properties

Allowable Ampacities of Conductors

» Allowable Ampacities of Conductors

Maximum Number of Conductors in Conduit

» Maximum Number of Conductors in Conduit

Electrical Symbols

» Electrical Symbols

Us Weights and Measures

» Us Weights and Measures