D9412GV4/D7412GV4 v2.03 | Installation and System Reference Guide | 2.0 Lightning Strikes
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Bosch Security Systems, Inc. | 7/16 | F01U265457-09 10
2.0 Lightning Strikes
The control panels are designed to significantly
reduce 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 in anything
directly struck by lightning.
The effects of a lightning strike can include
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 0.61 m
(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 0.61 m (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.
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