Can tape be used to repair damaged extension cords?

While taping nicks or abrasions does not necessarily violate any OSHA standard, the agency recommends that employers not tape this type of damage for two reasons:

1. OSHA standards preclude using approved electrical conductors and equipment if their characteristics are significantly altered. Applying electrical tape that is too thick or applying too much of it could change the cord’s original flexibility and lead to internal damage.
2. The depth of the abrasions and cuts cannot be monitored to see if they get worse without removing the tape.

Tape repairs of the jacket may not be used to bring a worn or frayed cord into compliance as it can compromise both the design and safety of the cord. For example, taping can change the flexibility characteristics of the cord, which in turn can affect the amount of stress in the adjacent areas. This is of particular concern with respect to the grounding wire.

Also, taped repairs usually will not duplicate the cord’s original characteristics; in most cases neither the jacket’s strength nor flexibility characteristics will be restored.