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Safe use of extension cords

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Photo: Pichunter/iStockphoto

Extension cords can be found in many types of workplaces, from offices and warehouses to retail stores and construction jobsites.

Unfortunately, they’re often misused. Let’s go over some do’s and don’ts of extension cord safety from the Texas Department of Insurance Division of Workers’ Compensation.

Do:

  • Inspect an extension cord for physical damage before use.
  • Check that the cord matches the wattage rating on the appliance or tool you’re using.
  • Make sure all cords have been approved by an independent testing laboratory such as UL.
  • Fully insert the extension cord into the outlet.
  • Keep cords away from water.
  • Use ground-fault circuit interrupter protection when using extension cords in wet or damp environments.
  • Unplug extension cords when not in use.
  • Consider installing overhead pendants to reduce trip hazards.

Don’t:

  • Use an indoor extension cord outdoors.
  • Overload cords with more than the proper electrical load.
  • Run extension cords through doorways, holes in ceilings, walls or floors.
  • Daisy chain, or connect, multiple power strips together.
  • Move, bend or modify any of the extension cord plug’s metal parts.
  • Force a plug into an outlet.
  • Drive over an extension cord.
  • Attach extension cords to the wall with nails or staples.

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Yakubu Innocent Afenoko
June 29, 2022
One of the don'ts is not to use extension cord outdoor but when work is outdoor that require extension cord. What do I do in the circumstance?

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Gerry Burnett
August 19, 2022
I believe the don't said not to use indoor extension cord outside(Like the ones used on Christmas trees and other indoor devices)

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Juanita S. Kirkpatrick-CSP
August 29, 2023
The article was quick- there are several other things to consider when using any electrical cord. One in particular is knowing what the numbers and letters printed on the jacket (outer wrapping) are used for. Your article mentioned thing like wattage rating but users should also know what else those letters indicate. Such as "S" Hard Service Flexible Cord, for areas where you need something to withstand the conditions. "O" Jacket is Oil Resistant, in case you are using it in this type of environment. "OO" will indicate both the jacket and the conductors are Oil Resistant. "HH" for High Temperature, "W" Moisture Resistant, an others. If you see SJTW coded jackets it means that you have a hard service flexible cable with thermoplastic insulation and are moisture resistant and appropriate for outdoor use.

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S. MURTHY
August 31, 2023
Electrical safety is a most important in day-to-day life whether at Home or Workplace. This matter is well explained in this article. Shall be thankful for publishing such articles in future.