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I n s t a l l a t i o n E n v i r o n m e n t R e q u i r e m e n t s
•
For your own safety, install a main circuit breaker cabinet or other readily accessible
input power disconnect device in the same area as the Unison DRd rack enclosure. For
cross-bussed rack installations, this device may be the auxiliary rack. Main breakers
not in the same room must have a physical means to be locked off. ETC recommends
adopting lockout / tagout procedures for your facility and follow appropriate Lockout/
Tagout procedures as described in NFPA Standard 70E.
•
A clean (not dusty) temperature-controlled environment with an ambient temperature
of 32-104°F / 0-40°C and ambient humidity of 10-90%, non-condensing.
C A U T I O N :
•
Restricted public access to prevent tampering.
•
Soundproofing or performance area separation to muffle ventilation fan noise is
recommended.
•
All CE equipment is tested to EMC category B environment.
W i r e R o u t i n g a n d S p e c i f i c a t i o n
When planning wire entry into the rack, notice that conduit knockouts are provided only on
the sides of the unit. These knockouts are primarily used for bussing to an auxiliary rack but
may also be used for load or control wiring. Signal and power wiring must be run in separate
conduit per local code.
Due to the bend radii of certain size line feed wires and the location of terminations, special
attention is required for line feed wire entry. Reference the rack wiring guidelines below for
recommendations.
C A U T I O N :
100-127 VAC DRd Rack Enclosure
Wire Access
Location
Top of rack
Bottom of rack
Left side
Right side
8
HVAC systems must at all times maintain the specified ambient temperature at the
rack. Dimming systems operating within 10°F (5°C) of the upper or lower
temperature limits must strictly follow installation and operation guidelines to
operate reliably.
Do not route line (input feed) wires through the back panel. Doing so requires bend
radii that violate NEC code, UL standards and because of undue stress at the wire
joint is likely to create a poor connection.
Line and load wire used with Unison rack enclosures must be copper. Load wires
may either be stranded (preferred) or solid core. The use of aluminum wire is not
allowed in DRd rack enclosures.
Aluminum feed wires are supported only in the auxiliary (AX Series) rack
enclosures.
DRd12 Feed
(max)
350 Kcmil
2
185mm
acceptable
acceptable
Do Not Use
Do Not Use
Wire Size
DRd6 Feed
Load Wires
(max)
12 - 6AWG
2/0-3
2.5 - 16mm
2
70mm
acceptable
acceptable
acceptable
acceptable
Do Not Use
acceptable
Do Not Use
acceptable
®
Unison
Control Wires
2
acceptable
preferred
acceptable
acceptable
DRd Rack Enclosure Installation Manual
40°
100°
90°
30°
80°
70°
20°
60°
10°
50°
40°
0°
30°
20°
-10°
10°
0°
-18°
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