TM 9-3431-254-14&P
GROUNDING
10 feet (3048 mm) from the unit. The ground wire must
The frame of this unit should be grounded for personnel
be No. 8 size or heavier.
safety. Where grounding is mandatory under state or lo-
cal codes, it is the responsibility of the user to comply
NOTE: The ground wire must be as
with all applicable rules and regulations. Where no state
short as possible in order to produce
or local codes exist it is recommended that the National
the most efficient installation.
Electrical Code be followed.
TREATING AN OUTSIDE GROUND - The soil
These requirements and recommendations apply to rub-
treating materials are placed in a circular trench around
ber-tire mounted equipment as well as other equipment.
the rod, but not in direct contact. The crystals are
In addition to the usual function of protecting per-
gradually dissolved by surface waters and the solution is
carried into the most useful area of earth surrounding
sonnel against the hazard of electrical shock due to fault
in the equipment grounding serves to discharge the
the electrode (rod). Flood the trench several times when
static electrical charges which tend to build up on the
making original installation. See Figure 4.
surface of rubber-tire mounted equipment.
WARNING
These static charges can cause painful shock to personnel,
TREATING AN INSIDE GROUND - Reduce the
and can lead to the erroneous conclusion that an electrical
diameter of the hole to 6 inches (152 mm), pour soil
fault exists in the equipment.
treating material in around the rod. Add enough water
If a system ground is not available, the unit's frame must
to dissolve 8 pounds (3.62 kg) of soil treating material.
be connected to a driven ground rod (see Figures 4 and 5)
Flood the hole every 6 months and replace the soil treat-
or to a water pipe that enters the ground not more than
ing material when it is all dissolved. See Figure 5.
Inside Ground
Outside Ground
