Operation Manual

Installation requirements
DN9913471 © Nokia Networks Oy Internal Copy 23 (38)
Issue 1 en DRAFT 2 Draft
Note
Note
A power plug with protective ground connection is not sufficient for Nokia
MetroSite BTS. Grounding must have a fixed, non-removable connection.
Regulations issued by local authorities/legislation must be followed when
planning the grounding of a BTS site!
In general, grounding is planned as presented in the following:
• The grounding cable is connected with screws or with a nut to the
grounding point of the Nokia MetroSite GSM BTS, depending on which of
the two grounding point alternatives is chosen. All Nokia MetroSite GSM
BTSs are equipped with two grounding point alternatives: a cable clamp
and a grounding stud. The selection between the two alternatives must be
done according to local regulations. When grounding stud is used, the
grounding cable must be fitted with an appropriate lug.
• The minimum cross-section of the copper (Cu) grounding conductor is 16
mm
2
(5 AWG) in outdoor installations. In indoor installations, the
minimum cross-section of the copper grounding conductor is 2.5 mm
2
(12
AWG)
• The maximum cross-section of the copper grounding conductor is 35 mm
2
(2 AWG)
• The maximum value of ground resistance is 10 Ω
• The ground cable must be connected to a main grounding busbar
• The routing of the ground 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 lightning
A grounding cable can be ordered from Nokia.