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6. Assembly of the switchgear at site
WARNING
For ENA version: do not access the area behind or
alongside the switchgear when it is energised or
being energised.
6.1 General
Correct installation is of paramount importance. The
instructions given by the manufacturer must be
thoroughly studied and followed.
Installation must be carried out either by ABB
personnel or by suitably qualified and skilled customer
personnel. All necessary personal protection devices
must be used.
WARNING
Before removing the control panel cover, make
sure that the circuit-breaker is open and the
closing springs discharged.
Do not stand or walk on the switchgear.
6.2 Foundations
The following three basic installation methods of
switchgear in the switchroom are distinguished:
Method A – installation on the base irons of “C”
profile shape.
As standard, it is recommended to install the
switchgear on the base irons of “C” profile shape set
into the concrete floor of the switchroom. In this case,
the units are fastened using the special bolt blocks
(ABB delivers these on request).
Method B – installation on the levelled concrete
floor.
Installation directly on the levelled concrete floor
makes much higher demands on the floor levelling,
which must, in this case, fulfil the same tolerances as
the base irons during method A installation.
Fastening is carried out by means of anchoring bolts
in the concrete floor.
Method C – installation on the raised false floor.
In this case, fastening the units is carried out by
welding outside panels to the steel floor frame in the
place where the frame is larger than the switchgear
bottom, i.e. on the outside lateral walls of the unit
row.
Dimension chart of structural data
Switchgear room door width
Switchgear room door height
(2 )
Opening in ceiling if transported through roof:
(1) Pay attention to appropria te national standards.
(2) Applies to low voltage compartments of standard height.
(3) Approximate numbers depending o n the type of panels.
Generally, the following procedure for switchgear
anchoring can be recommended and, namely, for
any of the installation methods mentioned:
1. The switchgear panels are bolted together in the
front and rear part to make one unit.
2. Further structural data guidelines given provide a
rough calculation of the space required and the
plan for designing the room for a switchgear
project.
When the final building construction documents are
drawn up, the binding data supplied by ABB for a
particular case must always be taken into account!
6.2.1. Method of installation A – Installation of the
base irons
The general foundation drawing is given in following
figures according to the parameters of the units.
The “C" profile shaped base irons can be supplied
by ABB together with the switchgear. Their
installation is usually carried out by personnel on
site and should, if possible, be performed under
supervision of an ABB specialist. The base irons
must be installed in the slab before finishing the
floor;
Rest the irons in the specified position on the
concrete floor as shown in the relevant foundation
drawing and mark out the places for drilling the
holes. Then drill the holes for anchoring bolts, i.e.
for plugs 14 for fixing the base irons in the floor.
Then put the plugs in the holes and attach the
base irons to the floor loosely with bolts 13,
without final tightening so that any required
levelling is possible.
Carefully level the base irons both longitudinally
and transversally over the entire length and to the
correct height by putting strips of suitable
thickness under them and using a levelling
instrument.
Tolerances for laying the floor frame
Evenness tolerance: •+/- 1 mm over a measuring
length of 1m
Straightness tolerance: 1 mm per 1 m, but not more
than 3mm over the entire length of the frame.
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