Installation
15
Anchoring, Leveling, and Assembling Indoor Switchgear
Indoor switchgear shipping groups are held in true alignment
by bolts holding the vertical sections to each other.
The entire shipping group is to be anchored and leveled as a
single element without loosening any hardware until entire
shipping group is leveled and anchored.
1.
The switchgear equipment was accurately aligned at the
factory. This care insures proper operation and fit of mating
parts. Supporting surfaces for the switchgear at each
anchoring bolt locations must be level and in the same
plane within 0.06” (1.6mm). There must not be any pro-
jection above this plane within the area covered by the
switchgear cubicles.
If purchaser’s floor or grouted sill channels do not meet
this requirement, it will be necessary to shim in the fol-
lowing manner. The six (6) anchor bolt locations in each
cubicle must freely rest in firm contact with the mounting
support surfaces. There must not be any projection or
obstruction in other areas which may distort the cubicle.
Do not force cubicle in firm contact by drawing down
anchoring bolts as such drastic means will distort cubi-
cles. Add 4” (100mm) square shims adjacent to anchor
bolts until firm contact is achieved. Check each anchor
bolt location, 6 per cubicle. (See
Figure 7
)
2.
Tighten anchor bolts or weld to sills.
3.
If the lineup consists of multiple groups, move the next
group into position, with the front of units in line and tight
against the adjacent group. Do not bolt groups together at
this time. Check that the cubicles are in firm contact with
the foundation at each corner and anchor point, and that
bolt holes are in alignment. Add 4” (100mm) square
shims as necessary. Tighten the anchor bolts. Now bolt
groups together.
4.
After installation is complete, the lifting bar between units
may be removed and the unit lift bars pushed down inside the
units. Note that bolts inside the units which clamp the lift
bars in place must be loose to allow movement of the lift bar.
Anchoring and Leveling Outdoor Shelter-Clad Switchgear
In Shelter-Clad arrangements, the switchgear (as shipped) is
true and in correct position relative to its support base. The
formed floor sections are a permanent part of the switchgear,
and are not to be loosened or moved from position.
Verify the anchor bolt locations in the concrete and all points
shown in the general arrangement plan view. Sweep the foun-
dation to make certain it is free of pebbles and other debris.
Check the general arrangement drawing for positioning of the
switchgear and sequence of installation if arrangement consists
of more than one shipping group.
Single aisle Shelter-Clad cubicles are shipped with the aisle
wall covering the breaker drawout compartment. This wall
may be removed before moving the switchgear into position
on its foundation, if conduit clearances are in doubt, of if the
aisle is to be assembled immediately after leveling.
1.
Remove seal material at top of aisle wall.
2.
Unbolt, remove, and scrap the 1-1/4” plate and 1-1/4”
angle.
3.
Support wall with crane or other means. (Allow approxi-
mately 125 lb. (57kg) per unit) and remove the two angles
at each end of the group which hold the aisle wall in
place. These angles can now be scrapped. Carefully lay
aside aisle wall until needed for aisle assembly.
4.
Remove nuts from all anchor bolts, remove caps from all
secondary conduit stubs, and remove covers from sec-
ondary openings in cubicle floor plates.
The arrangement may consist of a single complete ship-
ping group, or may be split into a number of shipping sec-
tions for a long lineup. Refer to the general arrangement
drawing for instructions as to which shipping group should
be installed first, and in what sequence the remaining
groups are to be installed. Move the first group into posi-
tion as shown on the general arrangement drawing.
5.
The switchgear equipment was accurately aligned at the
factory. This care insures proper operation and fit of mating
parts. Supporting surfaces for the switchgear’s 6”
(152mm) base must be level and in the same plane within
0.06” (1.6mm). If concrete, grouted channels, pier sup-
ports, etc., do not meet this requirement, or if there is any
projection higher than the support points in line with the
base, shims must be installed in the following manner to
provide an equivalent true surface for switchgear support.
Outdoor switchgear groups which have been assembled
on a 6” (162mm) base must be supported along this base
with a span between support points not exceeding 36”
(914mm). If shims are required, use 4” (100mm) square
strips placed between the bottom of the base and the
foundation, in the anchor bolt area where they will be
clamped firmly in place. Do not force cubicle in firm con-
tact by drawing down anchoring bolts as such drastic
means will distort cubicles.
6.
Add clamp washers and nuts to anchor bolts and tighten
securely.
7.
Check all breaker compartments for free movement of
the shutters.
8.
Move the next group into position. The front edge of the
cubicle base should be in line with those of the previous-
ly installed group. This will insure a good fit with the
aisle floor plates. Make certain that the end of the group
being installed is tightly against the previously installed
group. Repeat steps 5, 6, and 7 and install all shipping
split hardware.
