Installation Instructions
Table Of Contents
- Requirements for Installation and Operation
- 1 About this document
- 2 Environment
- 3 Installation requirements
- 4 Cabinet interfaces and cables
- 5 Installation equipment
Installation requirements
DN9913471 © Nokia Corporation Draft 27 (44)
Issue 3-0 en Nokia Proprietary and Confidential
Note
Note
3.5 Grounding
To protect the Nokia MetroSite EDGE Base Station from damaging over voltages
through antenna equipment, communication cables, or power supply lines,
grounding cabling must be planned and installed before installation of the base
station. To avoid interference, it is recommended that large grounding systems be
designed case-specifically.
A electrical plug with a ground connection is not sufficient for the Nokia
MetroSite EDGE Base Station. Grounding must have a fixed, non-removable
connection.
Regulations issued by local authorities must be followed when planning the
grounding of a BTS site!
In general, grounding is planned according to the following requirements:
• The grounding cable is connected to the grounding point inside the BTS
cabinet.
All Nokia MetroSite EDGE Base Stations are equipped with two
grounding point alternatives: a cable clamp location and a grounding stud.
Selection is made in accordance with local regulations.
• The minimum cross-section of the grounding cable’s copper (Cu)
conductor is 16 mm
2
(5 AWG) in outdoor installations. In indoor
installations, the minimum cross-section of the copper conductor is 2.5
mm
2
(12 AWG).
• The maximum cross-section of the grounding cable’s copper conductor is
35 mm
2
(2 AWG).
• The maximum value for ground resistance is 10 mΩ.
• The grounding cable must be connected to a main grounding bus bar.
• The routing of the grounding cable must be as direct as possible.
Unnecessary loops should be avoided.
• The external antenna feeders must also be grounded if the antennas are
exposed to the risk of lightning.
A grounding cable can be ordered from Nokia.