DIGGER DERRICK
-XXVIII
463280 - 9/14 Terex South Dakota, Inc. Digger Derrick
WHAT IS INSULATED AND NOT INSULATED
E. This area does not provide insulation. This area contains conductive materials such as cylinders, pins,
boom structure, turntable, pedestal and other metal components. The operator shall not allow any
portion of this area to come in contact with an energized phase, ground or grounded objects. Proper
protective devices shall be used on all conductors. This area is attached to the vehicle and connected
trailers, which must be barricaded and/or grounded through a compliant ground system when working in
the vicinity of energized conductors. Any contact with a phase or between two phase conductors will
create a hazard.
UPPER BOOM RATING
The ID plate on your digger derrick will indicate if the unit is insulated and the voltage the insulation has been
designed and tested to withstand. The manuals also indicate what areas of the machine will provide
insulation. Look on the ID plate for the QUALIFICATION VOLTAGE. The number in this area is the voltage
rating the unit was tested and qualified per ANSI standards. The date of the Manufacturing Qualification test
is indicated on the ID plate as the TEST DATE. To maintain the dielectric rating, there must be a periodic
dielectric test performed and documented. The digger derrick shall be considered NOT INSULATING if the
periodic test is not performed.
test is indicated on the ID plate as the TEST DATE. To maintain the dielectric rating, there must be a
ID PLATE
VOLTAGE RATINGS
There may be two Voltages stamped on the ID Plate near the lower controls of the Aerial Device and shown
in the front of this manual.
Design Voltage - This is the maximum voltage that this machine can be rated if it is properly equipped
and tested. This is normally not shown for Digger Derricks because they have one rating shown in the
Qualification voltage box.
Qualification Voltage - The qualification voltage is the maximum voltage for which the upper boom
insulation has been tested and is rated. The aerial can be use to work on or near electrical system lines
up to this phase to phase voltage if the proper personnel protective equipment is used and the upper
boom is fully extended without the load line crossing the insulating section.
Qualification Voltage
Maximum Phase to Phase
voltage machine can be
used, with proper PPE and
work practice.
Date of Manufacturer’s
Not Insulated or Insulated
If the Insulated box is checked,
it indicates the booms have been
tested to meet the requirement of
the qualification voltage. If the Not
Insulated box is checked, the unit
will not provide any dielectric
protection.
ANSI Category
Not applicable for Digger
Derricks, there is only
one rating.
Dielectric Test
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