SUPER HEAVY DUTY EXTENSION WIRE CMS 241U WITH USB (EXT. WIRE) 3M

If you need an indoor cord just to plug in a lamp or phone charger, the 10-foot Cordinate Décor Extension Cord with 3 Grounded Outlets is the best choice. Unlike many inexpensive cords for indoor use, the Coordinate has a third prong for grounding, which provides extra protection against electrical shorts and shocks. Plus, it has a flat plug that’s less likely to be bumped out of the socket by furniture, pets, or people; half-plugged cords and damaged wiring can increase the risk of fire. 

Some other indoor cords share these characteristics, but what really sets the Coordinate apart is that it’s available in a wide array of colors. Cords like these aren’t meant to be used outdoors or with high-power tools and equipment—they’re intended only for low-power use around the home or office. All of the picks in this guide are available primarily from online retailers; the best extension cords are rarely found on shelves at big-box hardware stores. But if you need a cord right now, we do have tips for how to pick the best extension cord at your local hardware store.