AIS 3410, Electronics Unit
ED3047G842 / 01 (2009-08)
Technical Manual
3 Installation Recommendations
3.1 General Recommendations
t_ue_e03.fm / 27.08.09
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3
Installation Recommendations
3.1
General Recommendations
3.1.1 Cables
Cable types, cable data, maximum cable length, special instructions for cable laying and connection
details are defined in the
Cabling Documents
of the corresponding equipment (consisting of schematic
diagram, remarks, cable list and connection diagram).
Interface connections should be discussed and agreed with SAM Electronics
In order to ensure proper functioning of the equipment, the cable types should be selected according to
the cable lists.
In general, the following points must be taken into account:
-
For the
cables inside the units
(cabinets), an extra length of 1 metre is necessary at each end. If
the height of the unit exceeds 0.5 metre, an extension by 1 m plus the height of the cabinet is neces-
sary.
-
All cables should be kept as short as possible, especially coaxial cables to minimize attenuation of
signal.
In order to fulfil all abovementioned requirements, install cables in two steps:
Install cables and leave extra length of 1 metre or more as described above
Cut cables to correct length in order to reach its terminal, but
do not leave extra lengths furled
inside or outside the cabinet
-
The
cables must be marked
by the electrician at both ends with the cable numbers corresponding
to the SAM Electronics cabling documents.
-
Where necessary,
particular cable glands
- marked with letters and/or numbers - are assigned to
the cables.
The identification letters and numbers are stated in the connection diagrams; they are either fixed to
the unit or can be seen from the outline drawings (...BZ or ...MB).
-
All connectors installed outdoors (e.g. on coaxial cables) should be waterproof by design to protect
against water penetration into the cable.
-
Coaxial cables should be installed in separate signal cable channels/tubes and at least 10 cm away
from power supply cables. Crossing of cables should be done at right angles (90°). Coaxial cables
should not have any to sharp bends, which may lead to a change in the characteristic impedance of
the cable. The minimum bend radius should be 5 times the cable’s outside diameter.
-
It must be ensured that all
cables - including their screens - are passed into the units in contin-
uous lengths
and are not terminated before reaching the destination equipment.
-
With
multicore cables
, it is useful to strip down and lace the single wires according to the terminal
sequence.
-
Existing
cable grippers
in the units must be used.
-
All cable connections must be carefully
checked
after completion of the cable work and all cable
screens must be grounded via the shortest possible connections
- if not stated otherwise in the
Cabling Documents/Connection Diagram.
