D9412GV4/D7412GV4/D7212GV4 | Installation and Operation Guide | 2.0 Lightning Strikes
Bosch Security Systems, Inc. | 3/12 | F01U266054-01 8
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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