40-14 Preparation
D20x22 Series II Navigator HDD
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
For the system to function correctly, voltage stake must be fully inserted in soil through which a current can
pass. If the machine is located on asphalt, the voltage stake or the drill string must be inserted into the ground
through which current can pass. If the machine is on a dry hard surface, the auger stakes may need to be
inserted into the ground, or the ground under the tracks moistened to increase electrical conductivity between
machine and ground.
To improve the conductivity of dry and loose sand, dry soil, or asphalt:
•
Ensure voltage stake is fully inserted into the ground.
•
Soak soil around the stake with water.
