Voltage Drop for 8 AWG, 30 m, 30 A
Calculate the voltage drop along a heavy-duty 8 AWG, 30-meter wire carrying 30 amperes for a dryer or welder circuit.
How to use this tool
- Enter wire gauge (awg), one-way wire length and current in the fields above.
- Results update instantly as you type โ or click Calculate.
- Read your voltage drop and the full breakdown beneath it.
8 AWG wire at 30 meters and 30 A represents a long heavy-duty run for electric dryers, welders, or large air compressors.
Frequently asked questions
- What is the maximum recommended voltage drop?
- The NEC recommends no more than 3% voltage drop on a branch circuit and no more than 5% combined (feeder + branch). Above 3% you may notice dimmer lights or reduced motor torque.
- Does the return conductor also contribute?
- Yes โ current flows through both the hot and neutral (or ground-return) conductors, so the effective resistance is twice the one-way value.