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To determine the behavior of the soil capacity to drain the currents, its resistivity has to be measured.
For an adequate protection this value should not exceed 5 , being zero the ideal value
Generally, the grounding method used for TV retransmitters is a system with a single vertical electrode
made with copper measuring 2.5 meters or more.
In case the conditions and characteristics of the soil are of high resistivity or high incidence of lightning
discharges, the grounding system must be thoroughly analyzed.
It is very important to notice that the grounding systems of the equipment and the lightning rod are
independent and should never be connected to each other. A poorly elaborated grounding system can
cause damages to the equipment that won't be covered by the warranty.
3.6. Electric Installation Grounding
The shelter installations receive power through an aerial power line. Moreover, because of it, the
lightning discharges that might hit the power lines generate power surges that can reach the shelter and
consequently the equipment.
To protect the equipment against eventual power surges, we recommend the use of gas filled surge
protectors, after an isolation transformer with electrostatic shield.
When installing the grounding system, please observe the following items:
Connect all equipment carcasses to the grounding system using the grounding rig
that comes with them.
Connect the gate and all the wires from the fence to the grounding system.
Connect the neutral wire from the public power line to the grounding system.
Connect the rig from the lightning rod to the grounding system with the shortest
connection possible avoiding cable splices.
The tower’s structure must also be connected to the grounding system. Use
porcelain isolators to insulate the lightning rod rig.
3.7. Power Supply
Before plugging the equipment to the power supply, verify the voltage in the outlet to make sure that is
correct.If its variation is greater than 10%, it is necessary to use a power stabilizer to correct the voltage.
The power provided by the stabilizer must be at least 30% greater than the consumption of the
equipment
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