Lightning Strikes; Effects; Precautions During Installation - Bosch D9412GV2 Operation And Installation Manual

D9412GV2/D7412GV2 | Operation and Installation Guide | 2.0 Lightning Strikes

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 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 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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