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Phase R lug
Phase S lug
Phase T lug
Ground lug
Figure 16: Standard bus
bar connections
16
Connecting the line feed wires
Line feed cables are terminated in the racks connections bay on 175 amp
switch assemblies or on standard bus bars.
1. Pull the line phase and ground cables to the rack through the openings you
prepared previously. (See Using a wire trough for line cable and power
wire access on page 15)
Note: Cable entry from the bottom of the rack will require a large radius loop
in each cable to connect to the lugs on top of the switch assemblies.
2. Strip 1 inch of insulation from the end of the line phase and ground cables
and attach them to the correct lugs. Line connections are labeled R, S T,
and Ground .
All power cabling on
the dimmer bay of
the rack is prewired
at the factory
3. Tighten the lugs to the correct torque based on cable size.
Cable size
16 – 25 mm
2
35 – 50 mm
2
55 – 70 mm
2
2
95 – 120 mm
130 – 230 mm
240 – 400 mm
410 – 500 mm
Figure 15: Split bus cable connections
Torque (inch lbs)
110 inch/lbs
150 inch/lbs
180 inch/lbs
250 inch/lbs
2
325 inch/lbs
2
375 inch/lbs
500 inch/lbs
2
Connect phase and
ground cables to the
lugs on top of each
main switch
assembly
Ground lug (behind
main switch handle)
Phase R lug
Phase S lug
Phase T lug
Other line cabling in
the auxiliary bay of
the rack (shown in
black) is prewired at
the factory
Table 1: Line lug torque
Torque (Newton meters)
12.1 Nm
17.0 Nm
20.3 Nm
28.3 Nm
36.8 Nm
42.4 Nm
56.5 Nm
Electronic Theatre Controls, Inc.
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