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Installation
01.4IB.67000
F. PREPARATION OF FLOOR ANCHORING
1) Indoor Metal-Clad Switchgear
The station floor must be strong enough to
remain rigid and not sag under the weight
of the switchgear structure. The floor also
must be able to withstand the impact
stress caused by the opening of the circuit
breakers under short circuit conditions. The
impact load is approximately 1/ times the
static load weight of the switchgear.
The user must provide suitable means for
anchoring the equipment to the floor. It
is essential that the floor be level to avoid
distortion of the switchgear structure and
that the equipment be completely aligned
prior to final anchoring. The recommended
floor construction is shown in Figure 6. The
floor channels must be level and straight
with respect to each other. Steel shims
should be used for final leveling of the
switchgear, if necessary. Care should be
taken to provide a smooth, hard, and level
floor under and in front of the units to
facilitate installation and removal of the
breaker. If the floor is not level and flush
with the floor channels, it will be difficult to
handle the breaker because it will not be
level with respect to the stationary element.
The switchgear structure can be secured
by bolting it to the floor channels using at
least /” bolts at locations shown in
Figure 6. Plug welding can also be used at
the same locations if desired.
Provisions should be made in the floor for
conduits for primary and secondary cables,
located as shown on the floor plan drawing
furnished for the particular requisition. If
desired, the conduits may be installed
before the switchgear. Consideration
should be given to conduits which might
be required for future connections.
Conduits must extend no more than one
inch above the furnished floor prior to the
installation of the switchgear. If shipped in
more than one section, shipping sections
must be assembled in the proper sequence
due to the location of conduits. The left
hand section of a switchgear lineup must
be positioned in its final location first. Then
the section located immediately to the
right must be positioned as close as the
lifting members permit with the front in
alignment with the first section. Remove
the lifting members and then push or jack
the unit to the left until it is flush with the
first section.
!
Be sure to distribute the forces over the
side frame using appropriate timbers so as
not to deform or damage the surface of the
structure.
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