how to size electrical wire for distance
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How do I calculate the appropriate wire size?
Enter the information below to calculate the appropriate wire size. 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.
What is the best wire size for a branch circuit?
Branch circuit wire sizes for long runs: The long-run wire sizes given in the table above are for typical residential branch circuits up to 50A. These circuits are 120VAC (single phase) single conductor. Three phase power typically reduces the wire size to the next smaller. Cable size recommended based on voltage drop calculations.
Do electricians jump up wire sizes?
However many electricians simply jump up one wire size for each 100 feet of run length. A more engineering approach is cited at the Mike Holt’s electrical forum where a reader says as an engineer he calculates the voltage drop (and thus the need for a larger wire size) when the run length of the circuit exceeds voltage rating of the circuit.
What is the maximum length of cable for a 120 volt circuit?
The following are the maximum lengths of cable you can use while still maintaining a 3 percent voltage drop for the given wire size (AWG) and circuit voltage. As an example, for a 120-volt circuit, you can run up to 50 feet of 14 AWG cable without exceeding 3 percent voltage drop.