Busway - Eaton Pow-R-Line SPX0361126 Maintenance Manual

Instruction Manual IM01500001E
Effective July 2011

Busway

A switchboard may include one or more provisions for connection
to Eaton brand busway . Busway can feed the switchboard, be fed
from the load side of an overcurrent device within the switchboard,
or both .
Switchboards with busway connection(s) contain flange connection
'tie-bar(s)' assembled in the appropriate section . The tie-bars will
accept the corresponding busway flange extension . Consult switch-
board and busway drawings for specifics . The tie-bars are a transition
between the switchboard conductors and the busway flange exten-
sion, and are assembled as part of the switchboard section .
C L C L
Figure 22. Downward Elbow Right Flange
Figure 23. Standard Flange
The switchboard flange has a corresponding piece shipped with the
busway run . The busway installer attaches the two flange pieces
together prior to energization . (See Figure 22 and Figure 23 .)
12
eaton Corporation www.eaton.com
X
C L
Y
11.62
(295.2)
minimum
Recommended
Hardware for Bolting
to Flange Extensions
Phase Bus
Extension
92.00
(2336.8)
0.375 Hardware
Hex Head Bolt
Flat Washer
& Keps Nut.
Tighten Bolt with
20 lb ft Torque
L C
Side View of Busduct Aligned
From Rear of Switchboard
Figure 24. Busway/Busduct
The bus assembly is completely formed and drilled for connections,
including phase bussing and neutral, if needed . Additionally, ground-
ing connections are supplied .
Busway typically enters a switchboard section through the top .
However, busway may attach from the bottom, back, or side of the
switchboard in special configurations . (See Figure 24 .)
Temporary bracing may be provided to support the busway assembly
in the switchboard during shipment . All temporary bracing must be
removed after connections are completed .
The switchboard structure should NOT be used to support any
busway run or flange and extension .
Bolts and hex nuts with captive Belleville washers are supplied by
the manufacturer with the switchboard to connect the switchboard
installed flange and the busway flange . Follow instructions shipped
with the switchboard and with busway flange .
When a busway connection is supplied on an outdoor switchboard,
sealing the busway connection is critical . Upon completing the
necessary bus connection, the installer is responsible for sealing the
connection point where the busway flange connects to the chimney
top cover or side/rear cover . A tube of RTV 732 silicone sealant and
a roll of gasketing material are provided with the switchboard for
this purpose .
For installation instructions on busway runs, please refer to
NEMA publication BU 1 .1-2000, General Instructions for Handling,
Installation, Operation and Maintenance of Busway Rated 600V
or Less.
Pow-R-Line switchboards
Busduct
Flange
Switchboard
Ground Bus
C L
Connection
90.50
(2298.7)
View of Three-Phase
Four-Wire Busduct Centered
in Switchboard
5.00
Busduct
(127.0)
3.00
(76.2)
Tie-Bar