Extension Cord Safety

How do I pick the right cord?

Read the markings on the cord and on whatever you are plugging in. Cords carry a rating based on wire thickness, and heavier loads need thicker wire. Longer cords lose more power, so for the same load, a longer run needs a thicker cord. Check the label on the tool or heater for its power draw and compare it with the cord rating.

If the markings are worn off or you cannot tell, do not guess. Use a cord you can identify, or ask a hardware supplier or electrician.

Also consider the plug. Two-prong and three-prong plugs exist for a reason, and the third prong carries fault current away safely. Do not defeat it, and replace any equipment that no longer fits a grounded outlet properly.

What makes a cord suitable for outdoors or the barn?

Outdoor and barn use calls for cords labeled for that use, with a tough jacket and covers that resist moisture, sun and abrasion. Indoor light-duty cords break down quickly in cold, damp and dusty conditions. Use plugs and outlets with weather covers, and keep connections off the ground where water collects.

Protective devices that cut power when electricity leaks are commonly used on outdoor circuits. Ask an electrician what suits your location.

• Use cords marked for outdoor or heavy-duty use.
• Keep connections raised and covered from rain and puddles.
• Never run a cord through water or standing mud.

Why are heaters and stock tank heaters special cases?

Heaters draw a lot of current for a long time, and that is where cords overheat. Many heater makers advise plugging directly into a wall outlet and not into a cord or power strip. Follow the manufacturer's instructions, since they take priority.

If a tank heater needs a cord because the outlet is far away, a permanent outlet installed by an electrician is safer than a long temporary run. Check animals' access too, because chewing exposes live wire.

What habits keep cords safe?

Uncoil cords fully before use, since coiled cords hold heat. Do not run them under rugs, bedding or hay, through doorways that shut on them, or across traffic. Do not daisy-chain cords or stack plug-ins. Unplug by pulling the plug, not the wire.

Feel cords and plugs during use. Warm is a warning, hot is a stop sign. Store cords dry and loosely coiled, hung off the floor away from rodents.

Check animal areas often. Rodents, goats and horses chew cords, and a pinched or nibbled cord in bedding is a fire waiting to happen. Route cords overhead and out of reach.

When should I throw a cord away?

Retire cords with cracked or cut jackets, exposed wire, bent or loose prongs, melted plastic, a plug that is loose in the outlet, or any burn marks. Do not patch damage with tape and keep using it. A repaired cord can hide damage and fail under load.

Do not remove the grounding pin from a plug or force a plug into an outlet it does not fit.

When is a cord not the right answer?

If you rely on a cord every day, in the same place, for the same device, you need a permanent outlet or circuit. Ask a licensed electrician about adding one, and ask your local permit office about rules for outbuilding wiring.

Budget by category: the electrician, materials, trenching or conduit if needed, and any permit or inspection fee. It costs more up front than a cord, and it lowers fire and shock risk over the years.

What is a good cord storage and inspection routine?

Choose a regular day, perhaps the start of each season, to lay out every cord and look along its full length. Check the plug ends, the jacket, the connectors and any labels. Retire what looks bad, and label the rest with their ratings so you do not have to guess later.

Store cords loosely coiled on a hook or reel in a dry place off the floor. Keep them away from rodents, sunlight, chemicals and sharp edges. Keep indoor-only cords separate from heavy-duty outdoor ones so the wrong one is not picked up in a hurry.

Think about where cords run through the day. If a cord lies across a gate, aisle or animal path, reroute it overhead or replace the need with a fixed outlet. Prevention is much easier than dealing with a damaged cord and a startled animal.

Last reviewed: November 12, 2026. Written by the Homestead & Small Farm Editorial Team. See our editorial policy.