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31
Installation
01.4IB.67000
2) Adding Units to Outdoor Equipment with a
Protected/Common Aisle
a. Remove the following items from the
existing protected/common aisle and
metal-clad section and move to the end
of the new addition (except as noted):
i. Channel End Caps
ii. Roof Caps
iii. Metal-Clad End Cap(s)
iv. Floor Tie Plate
v. Aisle End Bubble Enclosure
vi. Metal-Clad Front Trim Sheet -
discard
vii. Metal-Clad Rear Trim Sheet - discard
viii. Bus Opening Cover - discard
b. To install new metal-clad units:
i. Set new units in place and bolt
together
ii. Assemble bus opening cover, front
and rear trim sheets
iii. Assemble new roof caps and rear
channel end cap
iv. Assemble ground bus splice
between existing and new ground
bus
v. Assemble bus bars and insulating
boots
c. To install new protected aisle units:
i. Apply prestite sealer to metal-clad
roof
ii. Install new aisle assembly and bolt
in place
iii. Assemble new roof cap and channel
end cap
iv. Assemble new floor tie plate
v. Reassemble items i-v from section a.
J. INSTRUCTIONS FOR MAKING BUS CONNECTIONS ACROSS
SHIPPING SPLIT SECTIONS
1) Introduction
Power/Vac® switchgear is shipped in splits
of one, two, three, or four stacks. When
connecting shipping splits together it may
be required to make the connections across
the main bus or the tie bus. The main
bus can be accessed from the front of the
gear through the breaker compartment
and the tie bus can be accessed from
the rear. Breakers and rollouts should be
removed from the switchgear before the
bus connections can be made across the
shipping split.
Ground bus connections across shipping
splits shall be made as specified in
Ch 4 Installation, R. Ground Bus.
All primary and secondary circuit devices
must be deenergized and the primary
grounded before undertaking any work on the
switchgear.
!
2) Main Bus Connections Across the Shipping
Split
Follow these steps to connect the main bus
across the shipping splits.
a. Remove the horizontal barrier located
between the front upper and lower
compartments (Figure 15, d). If heaters
are provided they will need to be
removed.
b. Do not remove the pan on which the
breaker ground shoe is located. In most
cases, the pan will have a cover over it
and is not required to be removed.
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