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Can
you use electrical tape to repair extension cords?
In a letter
of interpretation dated 12/16/1998, OSHA addressed the concerns
of an employer regarding the use of electrical tape to repair
minor damage (abrasions and cuts of limited depth) on the
outer jacket of an extension cord. OSHA gives an in-depth
answer to an age-old question for construction employers and
employees.
Here is
OSHA's response and the information you need when deciding
to repair or replace that worn out or damaged extension cord:
You ask whether there is any prohibition against
putting electrical tape over these kinds of abrasions and
nicks when there is no damage beyond the jacket, the conductors
have not been scraped or exposed, and the insulation inside
the jacket has not been displaced or compressed. Generally,
electrical tape may be used to cover superficial damage to
cord jackets.
Section
1926.416(e)(1) [of the construction regulations] provides
that "worn or frayed electrical cords or cables shall not
be used." Superficial nicks or abrasions, those that only slightly
penetrate the outer jacket of a flexible cord, and do not
permit the cord to bend more in that area than in the rest
of the cord, do not normally render a cord "worn or frayed."
Therefore, there is no need to repair or replace such a cord.
Recommendation
against taping
While
taping these incidental abrasions and cuts does not necessarily
violate any OSHA standard, we recommend that employers not
tape this type of damage for two reasons. First, §1926.403(a)
requires that "all electrical conductors and equipment shall
be approved." This standard precludes the use of 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. Second,
the depth of the abrasions and cuts cannot be monitored to
see if they get worse without removing the tape.
It should
also be kept in mind that the heavy duty extension cords commonly
used on construction sites are designed to withstand a hostile
environment. Damage to an extension cord that is bad enough
to consider taping may have caused damage beyond the jacket.
Tape
may not be used to repair significant damage to cord jackets
Repair
or replacement of a flexible cord (depending on its gauge)
is required when the outer jacket is deeply penetrated (enough
to cause that part of the cord to bend more than the undamaged
part) or penetrated completely, or when the conductors or
their insulation inside are damaged.
Two provisions
of the standard prohibit the repair of the jacket of a worn
or frayed flexible cord with electrical tape. Section 1926.403(a)
requires that the cord be approved. The original approval
of the cord was based on the types of materials and construction
used. As noted above, taping the cord 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,
the jacket is designed both to prevent damage to the conductors
and insulators inside, and to further insulate the conductors.
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. Therefore,
tape repairs of the jacket may not be used to bring a worn
or frayed flexible cord into compliance.
In addition, §1926.405(g)(2)(iii) states that "flexible cords shall
be used only in continuous lengths without splice or tap.
Hard service flexible cords No. 12 or larger may be repaired
if spliced so that the splice retains the insulation, outer
sheath properties, and usage characteristics of the cord being
spliced." This standard precludes the repair of flexible cords
smaller than No. 12.
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