Installation Instructions

System Requirements for Installation and Operation
30 (43) © Nokia Corporation DN00283911
Nokia Proprietary and Confidential Issue 2 DRAFT 1 - en
Note
4.4 Requirements for wall and pole installation
Qualified personnel must inspect the installation wall and/or pole or other vertical
support before mounting the MU, RU and mounting rack. The installation wall or
pole must be strong enough to bear the weight of each unit.
The optional pole mounting kit can be used when the installation pole diameter is
between 60 and 300 mm (2.36 and 11.81 in). These dimensions are applicable to
the MU. The RU can be mounted on a thinner pole.
Anchor screws
The anchor “Fishers” screws are used for attaching the MU and mounting frame
and RU with the mounting rack to the wall.
The MU anchor screws must be M6 size, stainless steel with the minimum
breaking strength (R
m
) of 800 N/mm
2
. An appropriate counterpart for the anchor
screw (for example, an anchor plug) must be selected according to the screw and
the mounting base material. If the anchor screws are of other standard than the
metric standard, they must be selected so that they meet the requirement set to the
metric standard screws mentioned above.
4.5 Grounding
To protect the MU from damaging overvoltages through communication cables,
or power supply lines, grounding cabling must be planned and installed before the
installation of the MU. To avoid interference, it is recommended that large
grounding systems be designed case-specifically.
A power plug with protective ground connection is not sufficient for the MU.
Grounding must have a fixed, non-removable connection.
Regulations issued by local authorities/legislation must be followed when
planning the grounding of a site!
In general, grounding is planned as follows:
• The grounding cable is connected with screws or with a nut to the
grounding point of the MU. The grounding cable must be fitted with an
appropriate lug.
• The minimum cross-section of the copper grounding conductor is 2.5 mm
2
• The maximum cross-section of the copper grounding conductor is 35 mm
2
• The maximum value of ground resistance is 10 mΩ
• The ground cable must be connected to a main grounding busbar