As you prepare to hang up the lights outside this holiday season, it’s important to know how to tell if an extension cord is for outdoor use. Choosing the right cord for the application is essential to ensure electrical safety and prevent home fires. In this guide, you’ll get expert advice from the team at Mr. Electric®, ensuring you have the information and safety tips necessary to get the light-hanging job done right the first time this season.
Which Extension Cord Is Right for Outside?
Extension cords have three categories of use: occasional, frequent, and rugged. In order to find the one that’s right for your project, you’ll need to check the cord packaging or the cord itself for the specific letter designating the intended use. The following information will help you to know if an extension cord is appropriate for outside use to power the lights on your house:
- The letter “W” on the packaging or the cord itself indicates a cord that is designed for use outside.
- The primary difference between an indoor extension cord and an outdoor cord is the insulation. Cords rated for outdoor use also have bright orange rubber, vinyl, or plastic covers that protect against moisture and the natural changes in temperatures that occur outside, as well as sunlight that can break down the insulation on typical indoor extension cords.
- While many indoor extension cords have two-prong plugs, outdoor cords always have three-prong plugs. The third prong serves as a grounding wire, reducing the risk of fire or electrical shock.
- Because outdoor devices often require more amperage than indoor devices, an extension cord that is appropriate for outside use will have a high amperage rating.
How to Protect Outdoor Extension Cord from Rain
If you don’t have ground fault circuit interrupter (GFCI) protected outlets installed on the exterior of your house, use a GFCI adapter along with your outdoor extension cord. It’s a smart way to provide an added layer of protection for your holiday light display. The GFCI plugs directly into your outlet, and then the extension cord plugs into the GCFI. It works as a circuit breaker that will automatically shut off if it senses power is flowing through water, a person, or anything else it should not be flowing through. Remember to always plug the GFCI into your outlet first before plugging in your outdoor extension cord to avoid electric shock.
Safety Tips for Using an Outdoor Extension Cord
Although choosing the right extension cord designed for outside use and using a GCFI extension are excellent safety measures, there are other things you can do to keep your family and your home safe.
- Store extension cords properly. When you are finished with the outside lights for the year, unplug the extension cords, carefully rolling them back up as they were when you opened the package. Then, hang them somewhere safe from the elements until you need them again.
- When taking extension cords out of storage, inspect them for cracks in the insulation and exposed wire. If you notice any problems, do not use the cord.
- Always keep extension cords away from spots that accumulate water or snow.
- Do not overextend extension cords by attempting to power too many appliances at once.
- Use brightly colored extension cords to help you locate them, to prevent tripping, and to help notify people who may be working in your yard or mowing that extension cords are present.
If you are still unsure whether an extension cord is for outdoor use, reach out to your local experts at Mr. Electric. It is always best to err on the side of caution and trust the professionals with your electrical services. Submit an estimate request online now or call to speak to one of the experienced electricians at Mr. Electric today.
This article is intended for general informational purposes only and may not be applicable to every situation. You are responsible for determining the proper course of action for your home and property. Mr. Electric is not responsible for any damages that occur as a result of this blog content or your actions. For the most accurate guidance, contact the Mr. Electric location nearest you for a comprehensive, on-site assessment.
FAQs About Outdoor Rated Extension Cords
The safety of your business, customers, and staff are the top priority of every Mr. Electric service professional. Our safety-first commitment to solving your electrical issues includes a meticulous attention to detail on every job. Our commitment also includes using our years of experience to answer your questions. Below are answers to some of the most frequently asked questions about how to tell if an extension cord is outdoor rated.
How can I tell if an extension cord is outdoor rated?
Look for the outdoor marking on the extension cord—a “W” printed on the packaging or the cord’s jacket. Outdoor-rated cords have durable, weather-resistant insulation that protects against moisture, sunlight, and extreme temperatures. If you’re unsure, consult the manufacturer’s label or choose a cord specifically labeled for outdoor use.
What does the outdoor marking on an extension cord mean?
The “W” marking indicates that an extension cord is designed for outdoor use. It means the cord has thicker insulation, is resistant to water and UV exposure, and can handle temperature changes. If the cord lacks this marking, it’s not safe for outdoor applications.
What happens if I use an indoor extension cord outside?
Indoor extension cords lack the insulation and durability needed to withstand outdoor conditions. Exposure to moisture, heat, or cold can degrade the cord, increasing the risk of electrical shock, fire, or short circuits. Always use a properly rated outdoor extension cord for safety.
Are all heavy-duty extension cords safe for outdoor use?
Not necessarily. While heavy-duty cords can handle higher power loads, they must still be outdoor-rated to be used outside. Check for the outdoor marking on the extension cord and ensure it has a durable, weather-resistant jacket before using it outdoors.
How do I know if my extension cord is waterproof?
Outdoor extension cords are weather-resistant but not necessarily waterproof. Look for cords labeled “water-resistant” or “weatherproof” and ensure all connections are covered with weatherproof outlet covers when used in wet conditions. For permanent outdoor power, consider installing a weatherproof outdoor outlet.
Can I bury an outdoor extension cord?
No, standard outdoor extension cords are not designed for burial. If you need permanent outdoor power, consider running underground wiring with a dedicated outdoor circuit. Consult a local licensed electrician for a safe, code-compliant solution.
What’s the difference between a three-prong and two-prong extension cord for outdoor use?
Three-prong and two-prong extension cords offer different safety features based on their intended uses:
Three-Prong Extension Cord:
- Grounding: The third prong is a grounding wire designed to protect you from electric shocks. It provides an extra layer of safety by redirecting any stray electricity to the ground.
- Ideal for Higher-Powered Appliances: These cords are designed for power tools and other outdoor appliances that require more power or have a higher risk of electrical malfunctions.
- For Outdoor Use: Most outdoor extension cords should have three prongs.
Two-Prong Extension Cord:
- No Grounding: Two-prong cords lack the grounding prong, which means there’s no direct path to divert stray electricity safely to the ground.
- Lower-Powered Appliances: They’re typically used for low-wattage household devices that don't require grounding.
- Less Safe for Outdoor Use: Without the grounding prong, these cords are not ideal for outdoor applications. Don’t use two-pronged extension cords with power tools or other devices that require grounding for safety.
How long can I safely use an outdoor extension cord?
Extension cords are meant for temporary use. Long-term outdoor power needs should be addressed with a permanent outdoor outlet installation. If an extension cord is frequently exposed to the elements, inspect it regularly for damage.
Can I plug an outdoor extension cord into another extension cord?
Daisy-chaining extension cords is unsafe. Plugging one extension cord into another can lead to overheating, fire hazards, and voltage drops. If your extension cord doesn’t reach as far as you need, use a longer, properly rated outdoor cord or install a dedicated outdoor outlet for a safer power solution.
