GE Industrial Solutions Spectra II Series Plug-in and Feeder Busway with BlueCoat Epoxy Insulation System - Manual (Page 24)

Spectra and Spectra II Series™ Plug-In and Feeder Busway
Installing Spectra II Series Busway
22
Installing Spectra II Series™ Busway
Where To Start
Start the installation, if at all possible, at the
most critical point; such as a main feed box,
switchboard or switchgear, an elbow, or other
critical fitting or termination.
Obstructions
Where a busway run must pass through a wall
or floor, an opening one-inch larger than the
busway cross-section should be provided.
Joints may not occur inside the walls or floors
per N.E.C. A flange is available to mask the
opening after the busway is installed.
Figure 28
 4‖ minimum provides clearance for 30-100 amp fusible plugs. 7‖
Minimum for 200 amp fusible plugs. 8‖ Minimum for all other plugs.
See Table 8.
Horizontal Mounting
 Overhead Support: ½‖ drop rods are
recommended. Max. 10 foot spacing. Drop
rods and other hardware must be furnished
by the installer.
 Maintain a good alignment of the drop rods
along the busway run.
 Avoid hanging drop rods at a busway joint.
 After the busway is secured in the hangers,
adjust the hangers on the rods for correct
elevation.
 Locate the Ø side down on the busway so
the plugs will be properly oriented.
 Sway braces may be required to keep the
run straight or to prevent rotation (furnished
by the installer).
Wall or Column Support: Single rod hangers
(Figure 30 and 31) may be used for mounting
busway on walls or columns by the addition of
an angle support furnished by the installer.
Table 10. Lowamp plug sizes (inches).
Device
Plug Dimensions
Plug
Overhang
Busway
Each Side
A B C D
Circuit Breakers
E-Line
13 8 11 21 2 ½
SF 21 ¼ 9 11 30 ¼ 2 ½
Fusible Switches
30A,60A 13
8 ¾
11 ¼
21 ¾
2 5/8
100A
18 ¾
27 ½
200A 16 5
400A 18 ¾ 20 ½ 37 ½ 7 ¾
Figure 29. Lowamp plug data.