Are extension cords safe for permanent use?

Question

I recently learned (via a rant from an electrician's son and some internet research) that the standard buy-anywhere cheapo extension cords are a big cause of electrical fires and are not recommended to be left plugged in.

So say I DO want to leave an extension cord plugged in permanently around the house. Is there some type of cord or some feature of a cord that is safer for this?

Answer 1

Extension cords that are not listed, labeled, or rated for permanent (long term) use are all temporary wiring devices.

If you need to permanently connect an electrical device, you should use approved wires and/or cable assemblies installed in an approved manner.

Answer 2

The Uniform Fire Code covers extension cords. They are for temporary immediate use of an appliance and are not for permanent installation. The code is not available online but here is a page that references it: http://www.grand.k12.ut.us/district/fire.htm#anchor157315

However, extension cords are different from power strips (AKA Temporary Power Tap) in that power strips with circuit breakers or breaker power switches have built in over-current protection. Power strips may be used for long term installation. Here is a page with more details: http://www.nccu.edu/health-safety/eohs/extensionCordsPowerStrips.cfm

So to answer your question, use a power strip with over-current protection if you need more outlets. Be sure to check as some power strips only have an on/off switch (no over-current protection)

Answer 3

As Tester101 says, extension cords are not meant for permanent wiring. If you really need an outlet in a given location, you should consider having one installed.

But there are a number of things to keep in mind when you are using extension cords.

• Don't staple them in place (big risk of damage)
• Don't use a cord that is rated for less amperage/wattage than you are using
• Don't try to use a two wire/two prong cord for a three prong device
• Don't octopus the cord (adding a multitap adapter at the end of the cord)
• Avoid using extension cords for any high draw devices, such as refrigerators, toaster ovens, irons, hair dryers, etc.
• Don't leave exterior cords plugged in

In general, the use of three prong, heavier (wire gauge, not weight), shorter cords are preferable.

And make sure they are out of the way and not a trip hazard (no crossing thresholds, other footpaths).