DIGGER DERRICK
-XXIX
Digger Derrick Terex South Dakota, Inc. 463280 - 9/14
WHAT IS INSULATED AND NOT INSULATED
The following 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. If it is insulating, it will provide insulation only when the upper boom is fully extended, clean
and dry, and maintained properly. Then it will only provide protection from current traveling from the boom tip
to the truck and earth ground through the booms.
The insulated boom section only prevents current from passing from the boom tip
through the vehicle to earth ground. All components above and below the
insulating section must be considered conductive. This insulating section only
provides protection when the load line does not span the insulating section, the
upper boom is fully extended, and in clean, properly maintained condition.
The boom tip is everything past the fiberglass insulating section. All boom tip
components are structurally and electrically connected. Contact with any part of
the boom tip will energize the entire boom tip including, controls and platform
support structure.
You must always cover the line and wear insulating gloves with insulating sleeves,
and a compliant hard hat when any part of the machine is working in or near
energized lines or conductors even when working on a grounded line, neutral line,
or ground line.
Death or serious injury to the operator or ground personnel can occur if any part of
the Digger Derrick contacts an energized conductor, ground line, grounded line, or
other OBJECTS. Proper clearance must be maintained.
Working around electrical power lines is covered by ANSI and OSHA Regulations.
To reduce danger to the operator and ground personnel, understand and follow all
rules.
The fiberglass upper boom and platform, including its components, do not protect
the platform operator from injury in case of contact between two energized lines,
or between an energized line and a grounded conductor.
Anytime the platform occupant(s) contact two items at different potential without
proper personal protective equipment, their body may become a path for electric
current, and they may be electrocuted. This includes touching the controls, any
tools, or items on the boom tip while also contacting a line or ground.
All conductors, including grounds and neutral lines are current carrying
conductors and must be treated as energized unless properly grounded and
tested.
You must read the operators manual thoroughly to understand any protection the
machine may provide.
A well maintained fiberglass boom may provide limited electrical insulation
between the boom tip and the vehicle to earth ground. All components of the
upper control station and boom tip are interconnected, meaning the fiberglass will
not protect the platform operator if any portion of the boom tip or upper control
station, including options, is brought into contact with an energized or non-
energized conductor and the operator is in contact with a different potential, such
as an energized or a grounded non-energized conductor. The fiberglass will not
provide protection for the operator in phase to phase contact or a phase to ground
wire contact, nor will it protect the vehicle from becoming energized if the steel
boom sections are brought into contact with an energized conductor. Serious
injury or death could result.
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