In order to obtain an optimum installation
sequence and ensure high quality standards, site
installation of the switchgear should only be carried
out by specially trained and skilled personnel, or
at least by personnel supervised and monitored
by responsible persons.
6.1 General
On commencement of installation on site, the
switch-room must be completely finished,
provided with lighting and the electricity supply,
lockable, dry and with facilities for ventilation.
All the necessary preparations, such as wall
openings, ducts, etc., for laying the power and
control cables up to the switchgear must already
be complete. It must be ensured that the ceiling
height is sufficient for the opening travel of the
pressure relief flaps.
Compliance with the conditions for indoor
switchgear according to IEC, including the
conditions for the “minus 5 indoor” temperature
class must be ensured.
6.2 Foundations
The switchgear must preferably be erected on a
floor frame set into the switchroom floor or on
a raised false floor.
The structural data guideline listed below is to
facilitate a rough calculation of the space required
and for preliminary planning of the room design
for a switchgear project. When the final
construction documents are compiled, the binding
data supplied by ABB must always be taken into
account.
6.2.1 Metal floor frame/plinth fixing system
The floor frame/plinth, consisting of one or more
parts depending on the size of the switchgear, can
be supplied by ABB together with the switchgear.
It is usually laid by site personnel and should, if
possible, be aligned and inspected under the
supervision of an ABB specialist.
Installation of the floor frame/plinth:
•
Place the floor frame/plinth precisely in the
specified position on the concrete floor in
accordance with the general arrangement
drawing
•
Use the floor frames/plinth as a drilling template
to install the leveling screws
•
Carefully align the floor frame/plinth horizontally
over the entire surface and to the correct height,
by screwing up the jacking screws by an
appropriate amount and using a leveling
instrument. The top edge of the floor frame/
plinth should be 2 mm above the finished floor
surface. This facilitates erection and alignment
of the switchgear panels In some cases, this
means that the material thickness of an additional
floor covering to be fitted later must be taken
into account separately
Tolerances for laying the frame/plinth:
•
Flatness of ±1 mm/metre in all directions
under the switchboard and 1m in front of the
switchboard
•
Flatness of ±3 mm over the entire switchboard
length
•
Slide brackets against the frame at two
points-for each 3 m of frame length, secure
them to the concrete floor with plugs, and weld
them to the frame. The set position of the frame
on the concrete floor must not be altered during
this operation
•
Weld the floor frame parts together. Grind
down projecting parts and weld any seams
on the top of the frame flat
•
Make the necessary preparations for perfect
earthing of the floor frame with 30x4 mm
galvanized steel strip. Two connections are
necessary for long switchgears
•
When the floor top covering is applied, carefully
backfill the floor frame, leaving no gaps
•
The floor frame must not be subjected to any
harmful impact or pressures, particularly during
the installation phase
If these conditions are not respected, problems
during assembly of the switchgear and possibly
with movement of the withdrawable parts, as well
as opening and closing of the doors cannot be
ruled out.
—
6 Assembly of switchgear at site
A S S E M B L Y O F S W I T C H G E A R A T S I T E
23