2.
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 supports,
etc. do not meet this requirement, or if there is any pro-
jection 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 contact
by drawing down anchoring bolts as such drastic means
will distort cubicles.
3.
Add clamp washers and nuts to anchor bolts and tighten
securely.
4.
Check all breaker compartments for free movement of
the shutters.
5.
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 3, 4, and 5 and install all shipping
split hardware.
Expanding Length of Existing Conventional Outdoor
(Non-Walk-In) Switchgear by Addition of Units
Expanding the length of existing conventional outdoor
switchgear by field addition of units should be handled in the
same manner as Shelter-Clad switchgear with the exception
that there is no aisle with which to be concerned. Follow the
instructions given under “Expanding Length of Existing
Shelter-Clad Switchgear by Addition of Units”. However, note
that only roof channels, bus compartment barriers, and end
plates need to be removed on conventional switchgear.
18
Installation
