Prepare for Installation
7
Installation Environment Requirements
• For your safety, you should install a main circuit breaker cabinet or other readily accessible input
power disconnect device in the same area as the Unison auxiliary enclosure. For bussed enclosure
installations, this device may be the auxiliary enclosure. Main breakers not in the same room must
have a physical means to be locked off.
• A clean (not dusty) temperature-controlled environment with an ambient temperature of
0 to 40°C (32 to 104°F) and ambient humidity of 10 to 90%, non-condensing.
• Restricted public access to prevent tampering.
• Soundproofing or performance area separation to muffle ventilation fan noise.
Wire Routing and Specification
Unison AX series enclosures have conduit knockouts on both sides of the cabinet for feed through to
the adjacent DRd enclosure(s). The top and bottom are intentionally left blank to allow holes to be
punched to match the incoming conduit.
WARNING:
RISK OF ELECTRIC SHOCK! Failure to disconnect all power to the panel before
working inside could result in serious injury or death.
De-energize main feed to the dimmer rack and follow appropriate Lockout/
Tagout procedures as mandated by NFPA 70E. It is important to note that
electrical equipment such as dimmer racks can present an arc flash hazard if
improperly serviced. This is due to the high amounts of short-circuit current
available on the electrical supply to this equipment. Any work must comply
with OSHA Safe Working Practices.
CAUTION:
HVAC systems must at all times maintain the specified ambient temperature
at the enclosure. Unison systems operating within 5°C (10°F) of the upper or
lower temperature limits must strictly follow installation and operation
guidelines to operate reliably.
CAUTION:
Do not route line (input feed) wires through the back panel. Doing so
requires bend radii that place undue stress on the input lugs, may damage
insulation, and will violate the UL listing of this enclosure.
CAUTION:
Line (feed) lugs for the Unison AX enclosures are UL/cUL listed for use with
both copper and aluminum wire.
Wiring from the AX rack to the DRd enclosures must use the included
extra-flexible copper wire.
Load side termination are suitable for copper wire only.
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