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C h a p t e r 1
Prepare for Installation
U n p a c k a n d I n s p e c t
Before you begin installation, check your shipment and confirm it arrived complete and
undamaged.
Step 1:
Step 2:
Step 3:
Step 4:
M a i n C i r c u i t B r e a k e r P r o t e c t i o n
Before you begin installing the Unison
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 rack with a main circuit breaker.
W A R N I N G :
U s i n g 9 0 ° C o p p e r W i r e
To comply with UL requirements:
Use Copper Conductors Only, the torque rating for each Non-Class 2 field-wire
connector, and "Use 90°C conductors at the 75°C Ampacities", where readily visible in
the field wiring compartment; Class 2 adjacent to each Class 2, field-wiring connector.
Use only 90°C-rated copper wiring installed in accordance with all applicable local electrical
codes.
C A U T I O N :
1
Prepare for Installation
Check the shipping container for physical damage.
If you find damage, document it to help with a claim against your shipper.
Unpack your order and check the contents against the packing list to be sure
your order is complete.
If you discover a problem, call the ETC Systems Group the closest office of
purchase.
See "Contacting ETC" on page 2.
Rack enclosures installed without an accessible power disconnect device
cannot be serviced or operated safely. Follow all local codes and
restrictions.
Before removing dimmer or control modules for service, de-energize main
feed to dimmer rack and follow appropriate Lockout/Tagout procedures as
described in NFPA Standard 70E. It is important to note that electrical
equipment such as dimmer racks 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.
A two-wire circuit with separate hot and neutral conductors is required for every
branch circuit that will be connected to the DRd rack enclosure. Shared neutral
(multi-wire) branch circuit arrangements are not recommended for phase control
dimming systems due to harmonics and potentially elevated neutral currents in a
shared neutral arrangement.
For retrofit installations where shared neutral circuits are already installed, or track
lighting installations where the track has a shared neutral, consult ETC Technical
Services for installation guidelines.
®
rack enclosure, make sure you have installed a
5
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