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and from the bonding position. The hot-stick guide shall be removed when workmen
are bonded to the conductor.
4.3.5 Base-supported Ladders. An insulating ladder may be supported on a fixed base
and used for live-line barehand work in accordance with the following basic minimum
support for the length of insulating ladder and weight to be supported.
b. Minimum Distances.- When the workmen mount the insulating ladder to the work
position with the insulating ladder energized, the length of insulating ladder from
ground to the energized circuit shall be sufficient to provide the minimum phase-to-
ground distances specified in column (a) of the table in
(2.4 meters) to allow for the length of insulating ladder occupied by the workmen.
When a workman is on an insulating ladder and the insulating ladder is in an
energized condition, all other personnel shall stay clear of the insulating ladder and
INSULATED TOWER BOOMS
4.4.1 Voltage Limitation. Insulated tower booms may be used as personnel support
for work performed by the barehand technique on circuits or equipment with a
phase-to-phase voltage rating exceeding 100 kilovolts.
4.4.2 Operating Practices. Only certified workmen shall perform live-line work from
insulated tower booms, except that during training periods, a workman undergoing
training may practice mounting and dismounting the personnel-support platform of
the insulated tower boom and may perform specific work while supported by an
energized insulated tower boom. Various types of personnel-support platforms may
be used satisfactorily with the insulated tower boom, including, but not limited to,
bosun's chair, basket or bucket, tree-trimmer's saddle, and conductor cart. The
specific support platform to be used shall be properly attached to the insulated tower
boom and all component parts shall have an adequate safety factor for the load to
be carried. All components of the insulated tower boom and associated support
platforms shall have a minimum load rating of 500 pounds (2,244 newtons).
17 (FIST 3 - 29 5/90)
This Information is Reprinted From UNITED STATES DEPARTMENT OF THE
INTERIOR BUREAU OF RECLAMATION