Whether you’re plugging in Christmas lights, running a power saw, or just trying to reach that awkward outlet behind the couch, extension cords are the most used electrical tool in homes and workplaces, the go-to solution. But not all cords are created equal and using the wrong type can be inefficient, dangerous, or even a fire hazard.
In this guide, we break down the different types of extension cords, where and how to use them safely, and how to avoid common mistakes we often see on the job.
🔍 Why Choosing the Right Extension Cord Matters
Most people don’t think twice before grabbing any old extension cord from the drawer — but the wrong cord can:
- Overheat and cause fires
- Damage your appliances or tools
- Trip your breaker or cause electrical shocks
- Violate local safety codes (especially in workplaces)
That’s why understanding cord gauge, intended use, and environmental rating is key.
🔌 Common Types of Extension Cords and Their Uses
1. Light-Duty Extension Cords (Indoor Use Only)
- Common Label: SJT, SVT
- Wire Gauge: 16 AWG or thinner
- Use for: Lamps, phone chargers, alarm clocks
- Length: Typically 6 to 15 feet
- Limitations: Not grounded (usually two-prong) and not meant for high current draw
2. Medium-Duty Extension Cords
- Common Label: SJT, SJTW
- Wire Gauge: 14 AWG
- Use for: TVs, kitchen appliances, lawnmowers
- Length: Up to 50 feet
- Indoor/Outdoor?: Some are outdoor-rated — look for the “W” in the label
3. Heavy-Duty Extension Cords (Contractor Grade)
- Common Label: SJTW, STW, SOOW
- Wire Gauge: 12 AWG or 10 AWG
- Use for: Power tools, air compressors, portable heaters, sump pumps
- Length: 25 to 100 feet
- Features: Grounded plugs, thick insulation, high amp rating
4. Outdoor-Rated Extension Cords
- Common Label: Look for “W” and “W-A” (e.g., SJTW)
- Features: Weather-resistant jacket, UV protection, and sometimes cold-resistant plastic
- Use for: Holiday lights, garden tools, RV hookups
- Often Colored: Green or bright orange/yellow for visibility
5. Specialty Extension Cords
These are designed for specific use cases where standard cords aren’t ideal:
- Flat Cords – great behind furniture or under carpets
- Retractable Cords – ideal for workshops and garages
- Generator Cords – heavy-duty cords for generator hookups with twist-lock plugs
- GFCI-Protected Cords – built-in protection from ground faults (great for wet areas like basements and outdoor projects)
⚠️ Extension Cord Safety Tips You Shouldn’t Ignore
At Triton Electric, we’ve seen extension cord misuse lead to everything from short circuits to home fires. Follow these tips to stay safe:
- Never daisy-chain cords (plugging one into another) — this increases resistance and fire risk.
- Don’t cover cords with rugs — heat can’t escape, leading to melting or combustion.
- Inspect cords regularly — damaged cords should be replaced immediately.
- Use the right length — longer cords lower voltage and increase strain; choose the shortest length that works.
- Always unplug when not in use — reduces fire risk and unnecessary power draw.
📏 Extension Cord Wire Gauge Chart (Quick Reference)
| Gauge (AWG) | Max Amps | Best For |
|---|---|---|
| 16 AWG | 10 amps | Light-duty (indoor only) |
| 14 AWG | 13 amps | Medium-duty appliances |
| 12 AWG | 15 amps | Power tools, outdoor use |
| 10 AWG | 20+ amps | Generators, industrial |
🛠️ When It’s Time for a Permanent Fix
If you find yourself constantly running extension cords across rooms, under doors, or outdoors, it might be time to consider:
- Installing new outlets in convenient locations
- Adding dedicated circuits for high-power tools or EV chargers
- Setting up weatherproof outdoor outlets for patios or sheds
- Upgrading to GFCI or AFCI outlets for better safety
At Triton Electric, we provide clean, code-compliant installations tailored to your home or workspace. We’re proud to serve customers across Surrey, Langley, Burnaby, Vancouver, and the rest of the Lower Mainland
📞 Need Help? Call the Pros
Got questions about safe electrical use or want to upgrade your setup?
📱 Call Triton Electric at 604-300-4215
📧 Or Contact Us to schedule a free estimate today
Let us handle the wiring, so you can ditch the trip hazards and stop relying on cords that weren’t meant to do the job.