What uses of extension cords are prohibited?

Improper use of overloaded, unapproved extension cords can present a serious fire safety hazard in the workplace. As such, inappropriate use of extension cords would include:

• Using as permanent wiring,
• Using unapproved extension cords,
• Daisy chaining, and
• Using one surge protector/power strip to power another.

Extension cords may only be used in continuous lengths without splice or tap. Hard-service cord and junior hard-service cord No. 14 and larger may be repaired if spliced so that the splice retains the insulation, outer sheath properties, and usage characteristics of the cord being spliced.

Also, extension cords must be connected to devices and fittings so that strain relief is provided that will prevent pull from being directly transmitted to joints or terminal screws.