What Landscape Wire to Use for 10 Watts at 100 Feet?

If you're powering a 10-watt landscape lighting fixture 100 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 16 AWG landscape wire. It handles the load safely while keeping voltage drop within acceptable limits for 12V lighting systems.

Why 16 AWG Works

At 100 feet, 10 watts (~0.83 amps) through 16 AWG results in a voltage drop of only 0.67V (~5.6%) slightly above the ideal 5% limit, but still workable for short runs with low wattage.

Voltage Drop Summary

• Power: 10 watts
• Voltage: 12V
• Current: ~0.83 amps
• Distance: 100 ft
• Voltage drop on 16 AWG: ~0.67V (5.6%)

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?
Yes, it’s even better for long distances. But 16 AWG is acceptable for this short load.

What if I add more fixtures later?
Consider 14 AWG or 12 AWG if you plan to expand your lighting system.

Is voltage drop really that important?
Yes too much drop can dim your lights and reduce lifespan. Keeping it under 5% ensures full brightness and safe operation.

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 16 AWG for 10 watts at 100 feet. It’s a practical option, but consider 14 AWG for more headroom.

← 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.