98 Rockwell Automation Publication 750-IN118A-EN-P - May 2021
Chapter 4 Power Wiring
UL Listed Barrel Lugs
The customer provides UL Listed barrel lugs to make AC line input power and
output motor connections to L-brackets. Barrel lugs can be either crimp or
mechanical type. Use the vendor-recommended tooling to fasten crimp type
terminals to cabling. Torque mechanical type terminals according to vendor
instructions. Barrel lugs for connecting to L-brackets must have the
dimensions in Figure 94
.
Figure 94 - UL-List Barrel Lug Dimensions
Barrel Lug to L-Bracket to Busbar Connections
The L-brackets are installed onto the extruded busbar at the factory. The barrel
lugs are provided by the customer (UL Listed Barrel Lugs
). There are two sizes
of L-brackets that are used in the configured bays, a four lug L-bracket and a
two lug L-bracket. The four lug L-bracket can connect to up to four lugs, two on
each side of the L-bracket. The two lug L-bracket can connect to up to two lugs,
one on each side of the L-bracket. Figure 95 on page 99
shows the four lug L-
bracket.
To attach the conductors to the L-brackets, use M12 or 0.5 in. diameter bolts,
nuts, and washers. Bellville spring washers, or equivalent, are recommended.
Keep the L-bracket connections at least 51 mm (2 in.) away from the ends of the
extruded busbar.
Barrel lug to L-bracket to busbar connections are used for the following
connections:
• Some types of configured input bay - connect customer input power to
AC input busbar
• Some types of configured output bay - connect AC output busbar to
customer motor
Table 12 - Barrel Lug to L-Bracket to Busbar Connection Hardware
Hardware Where Hardware is Used Provider of Hardware
M10 Fasten L-brackets to the extruded busbar Rockwell Automation
M12 Fasten barrel lugs to the L-bracket Customer
Ø 12.7 mm
(0.5 in.)
44.5 mm
(1.75 in.)
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