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3.3.3.
Fixing of Support Box Assembly on Vertical Pillar
Having fixed the vertical pillars as described in section 3.3.2. Support box
assembly is required to be fixed on the top of each vertical pillar as shown in
Fig. 3.4 which gives the isometric view. The support box is fixed on the
vertical pillar using M8x50 hexagonal screws with plain washers and spring
washers. The bottom view of the support box after it is placed on the top of
the vertical pillar assy (Front) is clearly shown in Fig.3.4. A cut of 204 mm
has been provided for guiding the support box to rest on the vertical pillar
assembly. Support box has a length of 634 mm. This cut of 204 mm is not in
the centre. A length of 200 mm on left and 230 mm on right is shown. While
fixing this support box care should be taken to ensure that 230 mm portion
falls on right hand side as viewed from front side of the suite. It holds good
for all support boxes.
3.3.4.
Mounting of Mother Trough Assemblies
A cable runway is installed at a height of 2500 mm on the wall, behind suite
1, parallel to suite length to carry power, ground, subscriber and trunk cables
to all cabinets. The standard separation between this wall and suite 1 shall
be 1000 mm. These cables enter into the suites through mother trough. While
mounting cable runway supports on the back wall of first suite on which the
cable runway is to be laid, it must be ensured that it does not cause
obstructions for laying mother trough assemblies at the beginning and end of
the suite.
There are 3 types of mother trough assemblies viz; mother trough assembly
(left), mother trough assembly (right) and mother trough assembly (middle).
Mother trough assembly (left) connects the cable runway to the vertical pillar
assembly (front) at the beginning of the first suite. Then from this vertical
pillar assembly (front) to the vertical pillar assembly (front) at the beginning
of the second suite. Like this for second suite to third suite and so on. Mother
trough assembly (right) connects cable runway to the vertical pillar assembly
at the end of the first suite. Then from this vertical pillar assembly to the
vertical pillar assembly at the end of the second suite. Then from second suite
to the third suite and so on. Inter connection for the Mother trough assembly
(middle) are little different. There is no Mother trough assembly (middle)
between cable runway and the first suite. The left side and right side is as
seen from the front side of the suite. All power cables and ground cables enter
through mother trough assembly (left) only for termination on Power
Distribution Panel (PDP). Subscriber and trunk cables can enter from both
mother trough assembly (left) and mother trough assembly (right) depending
upon the location of the Basemodule or Line module on the suite where it is
to be terminated. The shorter length path should be selected. Mother trough
assembly (middle) carries intercabinet cables viz; BM-CM data and clock
cables.
INSTALLATION MANUAL
IRON WORK INSTALLATION
31
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