Extension cords are handy when you need a little more length to reach that outlet, but when used improperly, may be shock and fire hazards. Before the next time you grab any old extension cord from the junk drawer, take the time to read these simple safety tips.

Use Only as a Temporary Solution

Extension cords are designed to be used as a temporary fix only, never as a permanent part of your wiring system. Heavy reliance on extension cords in your home or workplace may mean you need more outlets.

Tip: Always unplug your extension cord when not in use.

Know Your Location - Indoor vs. Outdoor Use

Extension cords come in indoor and outdoor versions. Indoor cords are generally thinner and not made to stand up to moisture or extreme temperatures. Outdoor extension cords are generally thicker with a durable jacket that is made to withstand moisture and a wider range of temperatures and elements. While you may use an outdoor extension cord indoors, it is never safe to use an indoor cord, outside - so know your location. 

Tip: If you are using an extension cord outside, be sure it has a W designation letter on its jacket. This means it is rated for outdoor use.

Understand Your Amperage

Extension cords are made to safely handle and deliver only a certain amount of amperage, or power. Before you choose an extension cord, know how much power your device requires and choose an extension cord of the appropriate gauge and length to handle it. Overloading a cord can cause it to overheat and catch fire. Using the wrong cord also impacts the performance of your device, not giving it enough power to properly operate. In general, larger tools and devices require thicker, lower gauge cords. Smaller devices and electronics are best with thinner, higher gauge cords.

For detailed information on extension cord gauge, view our Guide to Choosing to Right Extension Cord for the Job.

Tip: Regardless of amperage total, avoid plugging multiple devices into one extension cord if possible.

Use the Right Length

The longer a cord is, the less power it can deliver to your device, so it is best to use a cord that is only as long as you need. Conversely, if your cord is too short, never connect two cords together. Purchase a longer cord.

Tip: Never roll or coil long cords while they are in use. This may prevent heat from escaping which is a fire hazard.

Watch Your Placement

Be careful where your cord lies while in use. Never place an extension cord in a high traffic area where it can be a tripping hazard or near any moving machinery. Never run a cord under a rug or furniture, under a floor, or behind walls. If a cord is covered, heat cannot escape and it may become a fire hazard.

Tip: Never tape or staple extension cords in place. Taping can cause overheating and stapling is a risk for shock.

Use Grounded 3-Prong Cords

If possible, always use a 3-prong grounded extension cord as opposed to a 2-prong cord. Only use a 2-prong extension cord if your electrical is outdated and you have to connect to a 2-prong outlet.

Tip: Never remove the grounding pin to fit into a 2-prong outlet.

Inspect Before and After Use

Before and after every use, always inspect your extension cords for exposed wires, fraying, and tears. Never use a damaged extension cord or attempt to fix it with electrical tape. Replace it instead.

Tip: Extension cords should be neatly rolled up and stored indoors to prevent early damage.

Only use Listed and Approved Extension Cords

You should only purchase extension cords approved by a testing laboratory such as Underwriters Laboratories (UL). You can find this information on an extension cord tag, packaging, or in product descriptions if purchasing online.