MIL-HDBK-1025/10
Table 27
Procedures for Grounding Insulated and Uninsulated Aerial Lift Trucks
I.
Insulated boom vehicles
A. Bond the vehicle to a separate driven ground rod located about midway on one side
and as close to the vehicle as practical.
B. If possible, keep insulated vehicles and their ground rods at least 3 meters (10 feet)
away from the structure grounding system to minimize step and touch potentials.
C. If workers can simultaneously contact two or more separately grounded systems, the
systems will be bonded together.
II. Uninsulated boom and other electrical work vehicles. Bond the uninsulated boom and
all other vehicles directly involved in electrical work to the grounded system. Use a
grounding cable rated for the maximum available fault current.
III. Tensioning vehicles
A. Vehicles used to pull and hold tension on the conductor or overhead ground wire
should be properly bonded to a structure ground or a temporary ground rod.
B. Stay on the vehicle or at least 3 meters (10 feet) away from the vehicle ground when
possible.
5.3.8 Temporary Grounding of Underground Lines. Ground all possible
sources of power (including transformer backfeed). Omission of grounds will be
permitted only if their application decreases the work hazard. Install protective grounds at
equipment terminations or ground cables by spiking (using an approved tool) prior to
work on cables
5.3.9 Opening or Splicing De-energized Conductors. Conductors may be
spliced at ground level, from aerial lift equipment utilizing ground mats (uninsulated aerial
lifts), or from insulating platforms (insulated aerial lifts). Grounding for conductive or
insulating platforms is shown on figure 7. Install all grounding jumpers with hot sticks.
Steps in providing safe grounds are given in Table 11. Remove in reverse order as
installed. Ground any mobile equipment. Stay 3 meters (10 feet) away from grounded
items and step onto equipment or platforms as quickly as possible to minimize any adverse
step and touch potentials.
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