D7x11 Series II Navigator Directional Drill Preparation 40-11
Strike Alert System Functions
The Strike Alert is only a warning device, not a protective device.
The Strike Alert system detects voltage on the machine and/or current running through the drill string in the
event of drill striking an underground power line. An alarm sounds alerting operator and other personnel of a
potentially dangerous situation.
The Strike Alert will not be set off by coming near a power source. If the Strike Alert Horn sounds, the drill may
have contacted an energized electrical line. Other indications of an electrical strike are electrical arcing,
explosion, smoke, or popping noises.
When an electrical strike occurs, large voltage differences may exist on the ground surface near machine and
along drill string. Standing or walking in these areas may cause electrical shock from the difference in voltage
between your feet. Anyone in the work area, including the locator, must wear electrically insulated boots. Keep
all other personnel away from work area.
Soil Conductivity
IMPORTANT: For the system to function properly, voltage stake must be located in soil through which a current
can pass. To improve the conductivity of dry and loose sand, dry soil, or asphalt:
• Ensure stake is fully inserted into the ground.
• Soak soil around the stake with water.
Hydraulic System Shutoff
Hydraulic controls will not function if the voltage is too low for the Strike Alert system to operate
(approximately 10.2 volts).
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