80459-641-01E Model 6 Motor Control Centers
10/2012 Appendix B—Non-Conductive Horizontal Bus Barrier Retrofit Kit
© 1999–2012 Schneider Electric All Rights Reserved
121
ENGLISH
Bottom Track and Bottom Retrofit
Bracket
1. Using a 1/8 in. (3 mm) drill bit, drill out both of the rivets on the horizontal
bus barrier bracket (the L-shaped bracket located on the topshelf—see
Figure 140). Remove the bracket and discard it.
2. To install the bottom retrofit track, follow step a if you have a welded
topshelf, or step b if you have a relay topshelf (see Figure 141):
a. Welded topshelf: Align the holes of the shelf with those on the
bottom track (see Figure 141). Rivet the track and the retrofit bracket
to the topshelf.
NOTE: If the bus contains four laminations, access the rivet holes
from underneath the topshelf.
b. Relay topshelf: Align the two holes on the relay shelf with the bottom
retrofit bracket holes (see Figure 141). Mark the places where you
will drill other holes to secure the bottom track to the shelf. Drill the
holes using a drill bit ranging from 0.136 in.–0.147 in. (3 mm–4 mm)
in diameter. Rivet the track and retrofit bracket to the topshelf.
NOTE: The bottom retrofit track can be riveted directly onto the relay
topshelf only if the relay assembly topshelf has two holes instead of
four.
Figure 140: Horizontal Bus Barrier (L-shaped) Bracket
Horizontal bus
barrier bracket
Figure 141: Welded and Relay Topshelf Assemblies
Welded Topshelf
Bottom retrofit
bracket and bottom
retrofit track
Bottom
retrofit
bracket
Bottom
retrofit
track
Relay Topshelf
Rivets
Four holes
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