Maximum Wire Distance Calculator for Fixed Voltage Drop
Planning outdoor lighting, driveway gates, shed feeds, and detached garage circuits. Determines the maximum allowable one-way run length in feet or meters before voltage drop exceeds target threshold (e.g. 3% branch / 5% total).
Step-by-Step Derivation ▼ Show Steps
Calculations adhere to standard electrical engineering physics and National Electrical Code (NFPA 70) regulations.
Engineering Principles & Calculations
This calculator uses the exact mathematical relationships between Wire Gauge (AWG), Circuit Amps (A), Circuit Voltage (V), Allowed Drop (%), Material (Copper/Aluminum) to determine Maximum Safe Run Distance (Feet & Meters). In practical installations, factors such as ambient raceway temperature, harmonic distortion, duty cycle continuous operation, and conductor impedance must be accounted for by a certified electrician.
Determines the maximum allowable one-way run length in feet or meters before voltage drop exceeds target threshold (e.g. 3% branch / 5% total).
Typical Application & Industry Guidelines
Planning outdoor lighting, driveway gates, shed feeds, and detached garage circuits.
Maximum Wire Distance Calculator for Fixed Voltage Drop Benchmark Lookup Table
| Wire Gauge | 120V @ 12A (15A Ckt) | 120V @ 16A (20A Ckt) | 240V @ 24A (30A Ckt) |
|---|---|---|---|
| 14 AWG Copper | 48 Feet | 36 Feet | 72 Feet |
| 12 AWG Copper | 76 Feet | 57 Feet | 114 Feet |
| 10 AWG Copper | 121 Feet | 90 Feet | 181 Feet |
| 8 AWG Copper | 192 Feet | 144 Feet | 288 Feet |
| 6 AWG Copper | 305 Feet | 229 Feet | 458 Feet |
| 4 AWG Copper | 485 Feet | 364 Feet | 728 Feet |