ASSEMBLY OF THE SWITCHGEAR AT SITE 19
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5 Assembly of the switchgear at site
In the interests of an optimum installation
sequence and the assurance of a high quality
standard, site installation of the switchgear
should only be carried out by specially trained
skilled personnel, or at least supervised and
monitored by responsible persons.
5.1 General site requirements
On commencement of installation at site, the
switch room must be completely finished,
provided with lighting and site electricity supply,
lockable, dry and with facilities for ventilation.
All the necessary preparations such as wall
openings, ducts, etc., for laying of the power
and control cables up to the switchgear must
already be completed.
Compliance with the conditions for indoor
switch-gear to IEC 62271-200, including the
conditions for the “minus 15 indoor” temperature
class must be ensured.
5.2 Foundation frame on a concrete floor
(Figures 5/1 to 5/2)
The switchgear is preferably to be erected on
a foundation frame set into the switch room
floor.
The guideline structural data listed below
facilitate a rough calculation of the space
required and preliminary planning of the room
design for a switchgear project. When the final
construction documents are compiled, the
binding data supplied by ABB Xiamen Switchgear
Co., Ltd. must always be taken into account!
The stipulations of DIN 43 661 are also to be
complied with when the foundation is laid.
This particularly applies to the evenness and
straightness tolerances as a precondition for
perfect installation of the switchgear.
The foundation frame, consisting of one or more
parts depending on the size of the switchgear,
can be supplied with the switchgear by ABB
Xiamen Switchgear Co., Ltd.; it is usually laid
by site personnel and should if possible be
aligned and inspected under the supervision
of a ABB specialist.
Installation of the foundation frame
• If the foundation frame consists of several
part, bolt these together at the prepared
joint locations using links in the specified
sequence and so as to achieve a level surface
• Place the foundation frame precisely in the
specified position on the concrete floor in
accordance with the installation drawing
• Enter jacking screws and place steel strips
below them
• Carefully align the foundation frame along
the entire surface and to the correct height
by screwing the jacking screws down by an
appro-priate amount and using a levelling
instrument
The top edge of the foundation frame should
be 5-12 mm above the finished floor surface.
This facilitates erection and alignment of the
switchgear panels.
e.g. evenness tolerance:
±1 mm within a measuring length of 1 m.
e.g. straightness tolerance:
maximum 1 mm per m, but not more than 2
mm over the entire length of the frame.
• Slide brackets against the frame at two points
for each 3 m of frame length, secure them to
the concrete floor with plugs and bolts, 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 foundation frame parts together.
Grind projecting parts and weld seams on the
top of the frame flat
• Make the necessary preparations for perfect
earthing of the foundation frame with 30x4
mm galvanized steel strip. Two connections
are necessary for long switchgears
• When the floor topping is applied, carefully
back fill the foundation frame, leaving no gaps
• The foundation frame must not be subjected
to any injurious impacts or pressures,
particularly during the installation phase
If these conditions are not fulfilled, problems
during assembly of the switchgear and possibly
with movement of the withdrawable parts and
opening and closing of the doors cannot be
ruled out.
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