ETC Unison DRd Dimming Rack Enclosure - Manual (Page 12)

8 DRd Enclosure Installation Manual
Installation Environment Requirements
• For your own safety, install a main circuit breaker cabinet or other readily accessible
power disconnect in the same area as the DRd enclosure. For cross-bussed
installations, this device may be the auxiliary enclosure. 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 following 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.
• 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.
Wire Routing and Specification
When planning wire entry into the enclosure, notice that conduit knockouts are provided
only on the sides of the unit. These knockouts are primarily used for bussing to an auxiliary
enclosure 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 wiring guidelines below for
recommendations.
C A U T I O N : HVAC systems must at all times maintain the specified ambient temperature at the
enclosure. 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.
C A U T I O N : 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 DRd enclosures must be copper. Load wires
may either be stranded (preferred) or solid core. The use of aluminum wire is not
allowed in DRd enclosures.
Aluminum feed wires are supported only in the auxiliary (AX Series) enclosures.
Wire Access
Location
Wire Size
DRd12 Feed
(max)
350 Kcmil
185mm
2
DRd6 Feed
(max)
2/0-3
70mm
2
Load Wires
12 - 6AWG
2.5 - 16mm 2
Control
Wires
Top acceptable acceptable acceptable acceptable
Bottom acceptable acceptable acceptable preferred
Left side Do Not Use Do Not Use acceptable acceptable
Right side Do Not Use Do Not Use acceptable acceptable
0°
10°
20°
30°
40°
50°
60°
70°
80°
90°
100°
-18°
-10°
0°
10°
20°
30°
40°