ETC Unison Auxiliary Enclosure Series - Manual (Page 10)

7 Unison Enclosure Installation
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 32 to 104°F (0 to 40°C) 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.
N o t e : Before removing dimmer or control modules for service, de-energize the main
feed to the dimmer rack and follow appropriate Lockout and 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 : HVAC systems must at all times maintain the specified ambient temperature at the
enclosure. Unison 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 place undue stress on the input lugs, may damage insulation, and will
violate the UL listing of this enclosure.
C A U T I O N : Line (feed) lugs for the Unison AX main circuit breaker enclosures are UL/cUL
listed for use with both copper and aluminum wire, while the main lug enclosures
are listed for copper wire only. Load side terminations used to feed the DRd
enclosures must be the included extra flexible copper wire.
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