Installation; Preparation For Installation; Foundation-General Requirements; Indoor Foundations - Siemens WL Series Instruction & Installation Manual

Type WL Low Voltage Metal-Enclosed Switchgear

Installation

Preparation for Installation

Prior to installation of switchgear, study this instruction manual
and the switchgear drawings, such as general arrangement, one
line diagram, schematic drawings, wiring diagrams, installation
instruction drawing, panel arrangement, electrical bill of material,
nameplate engraving list, and accessories drawing. Special
attention should be given to the foundation information con-
tained in this manual as well as the information provided on
the equipment drawings. Be sure that the foundation conforms
to the requirements described in this manual and the general
arrangement drawing.

Foundation-General Requirements

Prior to installation of the switchgear, careful design, planning
and construction of the foundation or base on which the switch-
gear will rest must be made. A thorough analysis and careful
construction may alleviate many problems at the time of instal-
lation, and during operation. It is important that a true and level
surface be provided, that is capable of supporting the weight of
the switchgear and other related equipment.
If the switchgear cannot be lowered over conduits because
of head room or other restrictions, conduit couplings may be
grouted in flush with foundation, and conduit nipples added
after the switchgear is in place.
Conduits should be capped during construction to prevent
entry of dirt, moisture and vermin.

Indoor Foundations

As it is difficult to obtain a true and level floor on a concrete
slab, it is highly recommended that 3" (minimum) sill channels
be grouted into the floor as shown in Figure 7. The surface of
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the sills should be slightly above floor level. The surfaces of the
sills must be level and in the same horizontal plane within 1/16"
(1.6mm). There should be no projection above the plane within
the area covered by the switchgear. If the floor or sills do not
meet this requirement, it will be necessary to use shims when
installing the switchgear on the mounting surface. When shims
are required, insure that they are installed at the front, middle
and rear of the equipment as a minimum.

Outdoor Foundations

Concrete slab, sill channels, piers or pilings, whichever type of
foundation is used, must have smooth and level surfaces and
be in the same horizontal plane within 1/16" (1.6mm). If these
conditions are not met, it will be necessary to use shims when
installing the switchgear.
For outdoor switchgear, support shall be provided at each end
and at the side of every vertical section. Refer to Figure 8 and
the switchgear general arrangement drawing for location of
support and anchoring points. If pilings are used, the diameter
is to be determined by purchaser; however, they should not be
less than 12" (305mm) diameter for sufficient contact, room
for anchor bolts, and grouting in of bed plates (if used). All
shipping splits must be properly supported.
Any conduits which are installed in concrete must be perpendi-
cular to switchgear mounting surface. Conduits should extend a
maximum of 1" on indoor equipment and 3" on outdoor equip-
ment above the equipment mounting surface. This will allow
the conduit to enter the vertical section and exclude entry of
water and rodents.
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