DIGGER DERRICK
-XXVII
Digger Derrick Terex South Dakota, Inc. 463280 - 9/14
WHAT IS INSULATED AND NOT INSULATED
WHAT IS INSULATED AND NOT INSULATED
The following will apply to insulated units only. If the unit is not equipped with an insulating boom the unit
does not provide any electrical protection. Refer to the ID plate on the unit to determine if it is considered an
insulating unit.
The term insulated means separated from other conductive surfaces by a dielectric substance (including air
space) offering a high resistance to the passage of current (from OSHA 1926.960).
A. Provides an insulating area between section “D” and earth ground when:
• The load line (synthetic rope or steel cable) is removed from across the fiberglass boom.
• Upper boom is fully extended.
• Fiberglass section is clean, dry and in properly maintained condition.
B. This area does not provide insulation. This area contains conductive materials; such as the boom
structure auger drive, and cylinders. The operator shall not allow any portion of this area to come in
contact with an energized phase, ground conductor or grounded objects. Proper protective devices shall
be used on all conductors. Any contact with a ground and a phase or between two phase conductors will
create a hazard.
C. This area does not provide insulation. This area contains conductive materials such as cylinders, pins,
boom structure, and other metal components. The operator shall not allow any portion of this area to
come in contact with an energized phase, ground conductor, or grounded objects. Proper protective
devices shall be used on all conductors. Any contact with a ground and a phase or between two phase
conductors will create a hazard. The position of the pole guides may affect the insulation gap provided
by section A.
D. This area does not provide insulation. This area contains conductive materials; such as control levers,
un-insulated platform(s), platform support shaft, boom tip structure and other metal components. These
objects must be considered connected. The operator shall not allow any portion of this area to come in
contact with an energized phase, ground conductor or grounded objects. Proper protective devices shall
be used on all conductors. The operator shall not make contact with any portion of this area when
working on or near an energized phase, ground conductor or grounded objects, unless wearing proper
protective clothing such as rubber gloves and sleeves rated at the voltage of the lines. Any contact with
a ground and a phase or between two phase conductors will create a hazard. Accidental contact of any
portion of area D to an energized conductor will energize the entire area D.
NOTE: A properly maintained platform liner will only provide protection for those portions of the
body or materials entirely within the liner and not in contact with any part of area D.
E
E
E
B
C
A
D
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