ETC Unison DRd Dimming Rack Enclosure - Manual (Page 29)

4
Terminate Wiring 25
Connect Line Power Wiring
Connect Line Feed in an Individual DRd Installation
Line feed cables are terminated on the 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 enclosure installations, load neutral and ground/earth wires must terminate in the
same enclosure as the matching load phase wires.
The bus bars are different for each enclosure type (DRd6 or DRd12) and each voltage (120,
230 or 240-277). Graphics are provided on the following page for reference.
Step 1:
Pull the line phase, neutral and ground cables to the enclosure through the
openings (conduit or other fittings) previously prepared.
Step 2: 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.
W A R N I N G : All terminations must be done with the power off. DRd enclosures installed
without an accessible power disconnect device cannot be serviced or
operated safely. In some instances, this device may be an auxiliary
enclosure with a main circuit breaker. Follow all local codes and
restrictions.
Before servicing, de-energize main feed to DRd and follow appropriate
Lockout/Tagout procedures as described in NFPA Standard 70E. It is
important to note that electrical equipment such as dimmer enclosures 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.
C A U T I O N : Line and load wires used with the Unison DRd must be copper. Do not use
aluminum wire.
N o t e : For DRd6 and DRd12 main lug, main breaker, and cross-bussed applications,
reference the Unison Auxiliary Series Enclosure Installation Manual .
Model
Hex Key Size / Wire Strip Length
Phase
Strip
Length
Neutral
Strip
Length
Ground/
Earth
Strip
Length
DRd6 120, 240, 277V AC
3/16” /
5mm
5/8” /
16mm
3/16” /
5mm
5/8” /
16mm
3/16” /
5mm
5/8” /
16mm
DRd6 230V AC
5/16” /
8mm
1” / 25mm
5/16” /
8mm
1” / 25mm
3/16” /
5mm
5/8” /
16mm
DRd12 240, 277V AC
5/16” /
8mm
1” / 25mm
3/8” /
10mm
1” / 25mm
3/16” /
5mm
5/8” /
16mm
DRd12 120, 230V AC
3/8” /
10mm
1” / 25mm
3/8” /
10mm
1” / 25mm
3/16” /
5mm
5/8” /
16mm