Electrical - Outlets

Extension cord safety tips for homeowners.

Extension cords are common household items that almost everyone takes for granted. So I was surprised recently to learn just how dangerous extension cords can be. Inspired, I went home to check mine out.  As I suspected, my cords were all ancient and ratty. It was time to head to our local “big box” to get replacements.

Confusing marketing

I was confronted by a wall of products at the store. So many that it stopped me in my tracks. The options were staggering. Adding to my confusion was heaps of mysterious and sometimes misleading information spread all over the packaging. Accordingly a new cord can be purchased in several versions including with a UL listing, 3-wire design, Multi-outlet, indoor only, outdoor weather resistant, 13amp, 1625 watt, 16/3, 125V, designer, basic, NEMA, reinforced blades, oil resistant, vinyl jacket and tangle-free. The cords were available in 3’,6’,10’, 12’, 15’, 25’, 50’, and 100’ lengths, and I could have them in white, brown, green, black, yellow, blue, pink, orange or red.  Even pink.

I got to thinking that if I am having this much trouble buying an extension cord, how in the world is the average joe ever going to able to do it? So, in this post, I am going to take you through my learning process and explain a few important and surprising things I discovered about extension cords. Hopefully it will help you.

Safety first

Construction sites are dangerous places, so the US government Occupational Safety and Health Administration (OSHA) has established regulations to help make them as safe as possible. One area of concern is working around electricity. After falls, electrical related injuries are the second leading cause of accidental death at work.  For this reason, has developed electrical safety procedures that prevent electrocution on the jobsite.

Homeowners can also benefit from these safety regulations. Let’s start with some simple OSHA best practices around extension cords. Since we all use extension cords at some time or another, these simple rules will help provide a much safer household for you and your family.

extension cord safety
An extension cord waiting to become an accident

A lot of people consider extension cords as little more than objects of convenience. When we need one, most of us are in the habit of grabbing any cord available.  Think back and you will probably remember times you used a cord with bent or broken prongs, exposed wires, missing ground plugs, or frayed jackets.

It is easy to overlook problems when in a hurry but we really need to think smarter about these products. Ignorance in this case can get you killed. Power cords are actually electrical tools. Tools that are used to provide a safe, flexible and extended high voltage electrical source for your power equipment. They need to be serviceable and in good condition.

Five OSHA Rules

Here are five really important OSHA extension cord rules you must learn and teach your family to follow:

Rule 1

Only use extension cords with GFCI protection. GFCI stands for Ground Fault Circuit Interrupter and it will disconnect power if a potentially dangerous situation occurs. A GFCI compares current flowing through the cord and disconnects the power of there is a “leak” or imbalance of 4-6mA.  GFCI’s are not expensive and can be real life-savers. I recommend using extension cords with built-in GFCI’s. Otherwise you must have a GFCI outlet or circuit to plug into. Be certain  since not every outlet or circuit in your home is protected this way.  If you are on a job site or some other area where certainty about GFCI protection is in doubt, you can simply use a cord like this with a “built-in” GFCI device

Rule 2

Use only one cord per tool up to 100 feet in length. Do not exceed 100’ feet. If a project requires more than 100 feet in distance, a temporary power distribution box will need to be installed. Never plug one extension cord into another.  This mistake can lead to fires, equipment failures and electrocution. A cords’ power ratings vary by wire size and length. Plugging two cords together reduces their current capacity in half which will result in voltage drop and overheating. Purchase heavy duty cords with 10-12 gauge wire. This avoids worrying about voltage drop problems. This gauge wire will handle any of your power tools without problems even at 100’ lengths. Forget about buying or using cheaper cords made with smaller gauge wire.

Rule 3

Do not use a damaged cord. A damaged and repaired cord is easy to spot as it will likely have tape on it. The cord may still work, but it is a violation of the OSHA regulations. Do not patch damaged extension cords. The only acceptable repair to a damaged cord is to cut off the damaged area and install a new male or female end. This may shorten the cord, but is safe and acceptable. Take care to protect you cords. It is easy to damage them by dropping tools or materials on them, by driving over them or pinching or kinking them.

Extension cord safety
Repaired extension cords are a no-no

Rule 4

Do not secure extension cords to walls or ceilings using metal nails or staples. Metal fasteners can easily damage the relatively soft flexible jacket of the cord.  Slight impacts, pinching or bending can damage the cord. Even pulling on the cable can wear through the jacket accidentally.

Rule 5

Do not run cords through doorways or under rugs. This rule helps avoid two causes of problems: trips/falls and traffic damage to the cord.  Lay the cords around the edges. Avoid laying cord across the room. Use cord protectors if they are exposed to any kind of traffic or abuse.

Extension Cord Safety Summary

  1. Every extension cord needs a GFCI
  2. Never plug one extension cord into another
  3. Do not repair damaged extension cords between the ends
  4. Do not hold extension cords in place by metal nails or staples
  5. Avoid running extension cords through doorways
  6. Learn how to properly coil and store your cord

Here are some references to extension cord safety put out by OSHA:



For work get a 50’ or 100’ 12-gauge cord with a built in GFCI. An illuminated end feature can save a 200’ walk to and from the receptacle to check for power. Get a cord with high quality terminations (ends) and a heavy-duty protective jacket.  Keep your cords safe. Don’t allow heavy objects to run over them and store them properly when not in use. Forget clever and expensive coiling and storing products. Learn from Dirt Farmer Jay how the pro’s coil and store extension cords… https://youtu.be/eTpbh2zJGhA  

Cords are rated for hard or extra-hard usage per the National Electrical Code. The ratings must be indelibly marked along every foot of the cord. Examples of these codes are: S, ST, SO, and STO for hard service, and SJ, SJO, SJT, and SJTO for junior hard service.

  • Get a professional 50’ or 100’ 12-gauge cord with a built in GFCI.
  • Get a cord with an illuminated end. These reveal instantly that power is flowing and will save a 200’ walk to the receptacle.
  • Protect your cords. Don’t allow them to become trip hazards or allow heavy objects to run over them.
  • Store your cords properly.
Print Friendly, PDF & Email

Help me to help you

Thank you for taking time to use this free website. I hope you find the junk-free information here fun and useful? Please send me your comments and feedback.

Writing and maintaining the information in this manual is a lot of hard work. By sharing these pages with your friends, you help me to continue the effort.  You can easily share these pages to all your favorite social media sites via the shortcut buttons on the sidebar. You can also simply email the page link to your friends. Please share often.

The very best way to help me happens when you use the embedded links to buy things. Using a link is easy and free, yet it provides a great source of support for this site. The vendors I've chosen to link to have proven to be trustworthy and are the very best resources available. That is why I recommend them personally.

HomePreservationManual.com is the place to visit if you want information on

  • maintaining your home
  • how to improve air quality
  • ways to improve the real value of your home
  • what are the best housekeeping services
  • the problems with handymen services
  • how to plan and execute home renovation and home improvement projects
  • tips for spring cleaning; tidying up a messy house
  • and generally how to be a better homeowner.

Make sure you download your monthly maintenance checklist for this month.

Linking to this site

Do you want to link to anything on this site? Please do! Go right ahead. I appreciate it and am honored to be considered as a resource on your website. Always feel free to link to anything you find helpful. Of course, please never copy anything (everything is copyrighted and registered), but link away and thanks!

Thank you!

Copyright and permission to use information.

If you have questions or just want to say hi, please send me a note. If you are looking for help performing the work described and you are in the San Francisco area, go to HPS Palo Alto Inc.and request a free evaluation.

As a reminder, it is unlawful to make copies including cut and paste or especially in the form of making printouts for reuse. If you wish to make a print for personal use, I will happily grant you one-time permission if you will kindly send me a request in writing.

Thanks again!