Powell Power/Vac - Figure 22 Typical Bus Compartment with Polyester Glass Inter-Unit Bus Support; Figure 23 View Showing Stacks Bolted Together

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Installation
Power/Vac® Metal-Clad Switchgear 5kV & 15kV
01.4IB.67000
Figure 22 Typical Bus Compartment with
Polyester Glass Inter-Unit Bus
Support
h. Align the switchgear stacks:
i. Gently align the next stack on the
left with this stack taking care not to
damage the porcelain bus supports.
ii. When the eight (8) bus support
holes (four holes for polyester bus
supports) are aligned, replace the
bus support assembly against
the side sheet and use the / - 20
hardware to fasten the bus supports
and the two side sheets together as
shown in Figure 23.
iii. A black rubber gasket is provided
to cover the edge of the side sheets
around the perimeter of the bus
pass-through cutout for 15kV gear.
It should be ensured that this gasket
is in place.
Figure 23 View Showing Stacks Bolted Together
i. Make bus connections (for polyester
glass bus supports go to Step iii).
i. Position the rubber cushion so that
it is approximately in the center of
the porcelain support. Apply RTV
sealant around the rubber cushion
to hold it in place.
ii. Gently insert the main bus through
the bus support taking care not to
break or chip the porcelain. The
main bus should pass through a
rubber bus cushion locate inside the
porcelain bus support. If the rubber
bus cushion falls off, reinsert the
cushion on the busbar as shown in
Figures 24 & 25 and pass the busbar
through the porcelain support.
iii. For polyester glass inter-unit bus
supports insert the bus through the
corresponding slots in the orange
polyester glass material.
iv. Make main bus connections at the
bus joint. The main bus should be
inserted into its vacant slot between
the splice plates. The bus should
lineup with the main bus coming
into the joint from the other side.
v. Tighten bus connections to between
30-35 ft-lbs.