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Section 5. INSULATED HAND TOOLS
Insulated or insulating hand tools are intended for working on, or in close proximity
to, energized electrical apparatus or conductors operating at a maximum voltages of
1000 volts ac. They may be used on deenergized and grounded high-voltage circuits
where it is impractical to work close to the personal protective grounds or where the
earth rise or expected voltage across the worker may exceed the 75 or 100-volt limit.
Live work is not recommended on uninsulated (field applied electrical tape is not
considered adequate insulation) station-service 460-volt buses, where the fault
currents are very high.
Tools include pliers, screwdrivers, knives, wrenches, etc. Construction is such that
only a minimum of uninsulated material is exposed and guards are in place to
prevent the hand from slipping onto the exposed areas.
ASTM standards have been approved, but have not been published and no number
has been assigned. These standards will be applicable to Reclamation purchases of
insulated or insulating hand tools.
Insulated hand tools shall be inspected prior to use. Insulation showing nicks, wear,
or the under color showing through shall be discarded.
21 (FIST 3 - 29 5/90)
This Information is Reprinted From UNITED STATES DEPARTMENT OF THE
INTERIOR BUREAU OF RECLAMATION