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2.0 Lightning Strikes
The control panel is designed to significantly reduces
electromagnetic interference and malfunction generally
caused by lightning.
2.1
Effects
Any electronic system can be struck directly by
lightning or be adversely affected by a lightning strike
near the system. When lightning strikes, several things
happen:
•
An electromagnetic wave spreads from the point of
the strike inducing high voltages in nearby
conductors.
•
The voltage changes substantially on electrical
grounds near the lightning strike.
•
High voltages are induced upon anything directly
struck by lightning.
Symptoms of installations that lightning might strike or
affect are Missing Trouble, Missing Alarm, or Point
Bus Trouble events. Occasionally, Reboot and
Watchdog events might be sent because the control
panel tried to reset itself.
Electronic systems, including control panels, cannot be
completely immune to direct or indirect lightning
strikes; however, some proven installation practices
might greatly reduce the risk of undesirable affects.
2.2
Precautions during Installation
To minimize the risk of undesirable effects from
lightning strikes on high risk installations that use a
point-bus technology:
•
Do not run wiring outside the building.
•
If you must install the unit in a metal building,
keep the wiring at least 2 ft away from external
metal surfaces.
•
Earth ground the unit correctly. Do not use an
electrical ground or telephone ground.
•
Avoid running wires near telephone, data, or
power lines inside a building. Historical evidence
shows that locating control panel wiring at least 2 ft
away from telephone, data, or power lines is
successful at minimizing lightning damage. When
your data lines must cross the path of AC or other
wiring, cross the lines perpendicularly.
Bosch Security Systems, Inc. | 5/05 | F01U003805B
D7212GV2 | Operation and Installation Guide | 2.0
Lightning Strikes
7
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