What Landscape Wire to Use for 10 Watts at 240 Feet?

If you're powering a 10-watt landscape lighting fixture 240 feet away from your transformer or power source, choosing the right wire gauge is critical for performance and safety.

Recommended Wire Gauge

For this setup, use 12 AWG landscape wire. It handles the load safely while keeping voltage drop within generally acceptable limits for 12V lighting systems.

Why 12 AWG Works

At 240 feet, 10 watts (~0.83 amps) through 12 AWG results in a voltage drop of approximately 0.63V (~5.2%). While slightly above the traditional 5% guideline, this is still considered safe and typical in real world landscape lighting especially with low power fixtures like this.

Voltage Drop Summary

• Power: 10 watts
• Voltage: 12V
• Current: ~0.83 amps
• Distance: 240 ft
• Voltage drop on 12 AWG: ~0.63V (5.2%)

Tips for Installation

• Bury cable at least 6 inches deep
• Use waterproof connectors
• Avoid tight bends or damage to insulation
• Label wire ends for easy troubleshooting in the future
• Keep wire runs away from sharp rocks or edges that may cut the insulation

FAQs

Can I use 14 AWG instead?
It’s not recommended at this distance and load. Stick with 12 AWG to keep voltage drop under control.

What if I add more fixtures later?
12 AWG already gives you excellent headroom. If you're adding significantly more fixtures, recalculate the total wattage to confirm, but 12 AWG will usually handle moderate expansion.

Is voltage drop really that important?
Yes too much drop can dim your lights and reduce lifespan. In low power setups like this one, a slight excess above 5% is generally considered safe, especially when using quality wire and efficient fixtures. Still, it's a good idea to monitor performance or consider upsizing wire if you're nearing system limits.

Should I use solid or stranded wire?
Use stranded wire for landscape lighting it’s more flexible and easier to route around obstacles in the yard.

Summary

Use 12 AWG for 10 watts at 240 feet. It's a practical and safe choice that keeps voltage drop close to the ideal range without over engineering your project.

← See Wire Sizes for Other Wattages and Distances

Disclaimer: Calculations are based on standard conditions and estimates. Actual performance may vary depending on installation specifics, environment, and cable quality.