Safety Directions GPS1200 97
in such an environment contact the safety authorities responsible for electrical
installations and follow their instructions.
• If the product has to be permanently mounted in an exposed location, it is advis-
able to provide a lightning conductor system. A suggestion on how to design a
lightning conductor for the product is given below. Always follow the regulations
in force in your country with regard to grounding antennas and masts. These
installations must be carried out by an authorised specialist.
• To prevent damages due to indirect lightning strikes (voltage spikes) cables, for
example for antenna, power source or modem should be protected with appro-
priate protection elements, like a lightning arrester. These installations must be
carried out by an authorized specialist.
• If there is a risk of a thunderstorm, or if the equipment is to remain unused and
unattended for a long period, protect your product additionally by unplugging all
systems components and disconnecting all connecting cables and supply
cables, for example, receiver - antenna.
Lightning conduc-
tors
Suggestion for design of a lightning conductor for a GPS system:
1. On non-metallic structures
Protection by air terminals is recommended. An air terminal is a pointed solid or
tubular rod of conducting material with proper mounting and connection to a
conductor. The position of four air terminals should be uniformly distributed
around the antenna at a distance equal to the height of the air terminal.
