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Installation and User Manual
2.4.2 Mechanical
The Comet UPS can be mounted on a raised computer room floor, or flush-mounted on a concrete floor. All
floors must be level. On a raised floor, conduits can be run below the floor, with cut-outs made in the floor tiles
as shown on the installation drawings.
Allow at least three feet of clearance in front of the UPS for normal operation (access to the UPS controls). The
Comet requires at least 36 inches top clearance for ventilation.
2.4.3 Electrical
Electrical service for the Comet UPS should be supplied on its own dedicated branch circuit. Main input cables and
upstream protective devices must be provided and sized per the National Electrical Code (NEC, ANSI/NFPA 70,
latest issue), and as appropriate for your load and distribution requirements. Cable sizing data is provided on the
installation drawings supplied with the equipment. The Comet 480/480V UPS is not a separately-derived source.
The Comet 208/208V UPS is a separately derived source. The neutral must be grounded on a separately derived
source (like the Comet 208/208V UPS).
CAUTION The customer supplied upstream protective device shall open in one cycle
when 10 times the output rated current is applied or in the event of an output
short circuit when the unit is working on “Static Switch.”
Refer to the upstream circuit breaker manufacturer’s characteristic curves for
proper trip settings.
Table 2-1: Recommended upstream protective device sizing *.
INPUT VOLTAGE
40kVA 50kVA 65kVA 80kVA 100kVA 125kVA 150kVA
208 150A 175A 225A 300A 350A 450A 500A
220 150A 175A 225A 300A 350A 450A 500A
480 70A 80A 100A 125A 150A 200A 225A
600 60A 70A 80A 100A 125A 150A 200A
* Size determined using nominal input currents.
Installation 2 — 386-160310-00 E00