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Connect Li ne Power Wiri ng
W A R N I N G :
C A U T I O N :
C o n n e c t L i n e F e e d i n a n I n d i v i d u a l D R d R a c k I n s t a l l a t i o n
Line feed cables are terminated on the rack's main phase lugs. It is best to route line
(feeder) cables first, load neutral and ground/earth wires next, load phase and control wires
last. In multiple rack installations, load neutral and ground/earth wires must terminate in the
same rack as the matching load phase wires.
N o t e :
The bus bars are different for each rack type (DRd6 or DRd12) and each rack voltage (120,
230 or 240-277). Rack graphics are located on the next page for reference.
Step 1:
Step 2:
Rack Model
DRd6 120, 240, 277 VAC
DRd6 230 VAC
DRd12 240, 277 VAC
DRd12 120, 230 VAC
4
Terminate Wiring
All rack terminations must be done with the power off. Dimmer racks
installed without an accessible power disconnect device cannot be serviced
or operated safely. In some instances, this device may be an auxiliary rack
with a main circuit breaker. Follow all local codes and restrictions.
Before servicing, de-energize main feed to dimmer rack and follow
appropriate Lockout/Tagout procedures as described in NFPA Standard
70E. It is important to note that electrical equipment such as dimmer racks
can present an arc flash safety hazard if improperly serviced. This is due to
available large short circuit currents on the feeders of the equipment. Any
work on energized equipment must comply with OSHA Electrical Safe
Working Practices.
Line and load wires used with the Unison DRd racks must be copper. Do not use
aluminum wire.
For DRd6 and DRd12 main lug, main breaker, and cross-bussed applications,
reference the
Unison Auxiliary Series Rack Installation
Pull the line phase, neutral and ground cables to the rack through the openings
(conduit or other fittings) previously prepared.
Strip the insulation from the end of each cable and terminate them to the lugs.
Reference the table below for wire stripping lengths.
• Line and neutral connections are labeled L1, L2, L3 and N. The equipment
grounding/earthing lug is labeled with the universal grounding symbol for
easy identification.
Phase
Length
3/16" /
5mm
5/16" /
1" / 25mm
8mm
5/16" /
1" / 25mm
8mm
3/8" /
1" / 25mm
10mm
Hex Key Size / Wire Strip Length
Strip
Neutral
Length
5/8" /
3/16" /
16mm
5mm
5/16" /
1" / 25mm
8mm
3/8" /
1" / 25mm
10mm
3/8" /
1" / 25mm
10mm
Manual.
Strip
Ground/
Earth
Length
5/8" /
3/16" /
16mm
5mm
3/16" /
5mm
3/16" /
5mm
3/16" /
5mm
Strip
5/8" /
16mm
5/8" /
16mm
5/8" /
16mm
5/8" /
16mm
25
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