Extension Cord Guide for Power Tools: Wire Gauge, Length, and Safety
Using the wrong extension cord with power tools is one of the most common—and dangerous—workshop mistakes. An undersized cord causes voltage drop that overheats the motor, reduces tool performance, and creates fire risk. Here’s how to choose the right cord every time.
Wire Gauge Explained
Extension cords are rated by AWG (American Wire Gauge), where lower numbers mean thicker wire capable of carrying more current. Most power tools draw 10-15 amps, requiring 12-gauge wire for runs up to 50 feet. Longer runs need even thicker wire to compensate for voltage drop.
Cord Selection Chart
| Tool Amperage | Up to 25ft | 25-50ft | 50-100ft |
|---|---|---|---|
| 0-5 Amps | 16 AWG | 16 AWG | 14 AWG |
| 5-10 Amps | 16 AWG | 14 AWG | 12 AWG |
| 10-13 Amps | 14 AWG | 12 AWG | 10 AWG |
| 13-15 Amps | 12 AWG | 10 AWG | 8 AWG |
Related Articles
- Power Tool Safety Gear: Essential Protection for Every Workshop
- Power Tool Battery Care: How to Double Your Battery Lifespan
- Power Tool Maintenance Checklist: Keep Your Tools Running for Decades
Safety Tips
Never daisy-chain extension cords. Always fully uncoil cords before use—a coiled cord generates heat. Use outdoor-rated cords (marked “W”) for exterior work. Check for damaged insulation before each use. And always use GFCI protection when working outdoors or in damp conditions.
