Protective Grounding - Nokia MetroHopper User Manual

4

Protective grounding

To ensure safe installation conditions for both personnel and equipment, the
grounding of and equipment station must be done before installing the equipment.
The purpose of protective grounding is to keep the potential of the equipment at
the same level as the potential of the surrounding ground. This prevents
generation of dangerous voltages between the equipment and the ground.
Because of the high locations of the radio and base station equipment, equipment
stations are particularly suspectible to lightning strokes.
The grounding should be done according to the rules and regulations issued by
the local authorities. Refer also to site level documentation, if applicable.
Note
To ensure the operation of the equipment, all equipment of an equipment station
must be connected to the same grounding potential.
Follow the grounding instructions presented in the Nokia MetroHopper Outdoor
Unit Installation document.
Ground the sheath of the Flexbus cable between the indoor unit and the outdoor
unit at approximately 50 m intervals. Ground the sheath also at the inlet to the
equipment space. National regulations may require grounding every 20 m.
DN99611437 © Nokia Networks Oy
Issue 2-0 en
Protective grounding
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