ETC Unison Auxiliary Enclosure Series - Manual (Page 7)

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Prepare for Installation 4
C h a p t e r 1
Prepare for Installation
Unpack and Inspect
Before you begin installation, check your shipment and confirm it arrived complete and
undamaged.
Step 1: Check the shipping container for physical damage.
Step 2: If you find damage, document it to help with a claim against your shipper.
Step 3: Unpack your order and check the contents against the packing list to be sure
your order is complete.
Step 4: If you discover a problem, call ETC Systems Group at (608) 831-4116.
Main Circuit Breaker Protection
Before you begin installing the Unison auxiliary enclosure, make sure you have installed a
main circuit breaker cabinet or other readily accessible input power disconnect device. In
certain bussed and cross-bussed systems, this disconnect device may be the Unison AX
series auxiliary enclosure with a main circuit breaker.
Using 90°C Wire
The AX MCB cabinets are listed for both copper and aluminum feed wiring, while the ML
cabinets are listed for Copper wire only. Bus cabling to DRd enclosures must use the
included copper cable to satisfy the requirement that the DRd is fed by copper wire only and
to meet UL bend radius limitations. All terminations in the AX and DRd cabinets are listed
for 75°C.
W A R N I N G : Auxiliary enclosures installed without an accessible power disconnect
device cannot be serviced or operated safely. Follow all local codes and
restrictions.
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.
N o t e : The terminals may be marked AL9CU indicating a 90°C rating; this is the lug
manufacturer’s rating - not the tested UL listing for the AX enclosure.