semiconductor failures. Indicator lamp denoting blown fuse conditions
shall be readily observable by the operator without removing panels or
opening cabinet doors.
1.3.3.4
Interchangeability
The subassemblies in one UPS module shall be interchangeable with the
corresponding modules within the same UPS, and from one UPS system to
another of identical systems.
1.3.3.5
Control Power
Control power shall be derived from two sources, input and output, with
automatic selective control. The control power circuit shall have suitable
protection, appropriately marked and located in the immediate vicinity of
the input protective device.
1.3.3.6
EMI/RFI Protection
The components and the system shall be designed to minimize the emission of
electromagnetic waves that may cause interference with other equipment.
1.3.3.7
Wiring
Wiring practices, materials, and coding shall be in accordance with the
requirements of NFPA 70 and other applicable standards. Wire runs shall be
protected in a manner which separates power and control wiring. Control
wiring shall be minimum No. 16 AWG extra-flexible stranded copper.
Logic-circuit wiring may be smaller. Ribbon cables shall be minimum No. 22
AWG. Control wiring shall have permanently attached wire numbers.
1.3.3.8
Terminations
Terminals shall be supplied for making power and control connections.
Terminal blocks shall be provided for field wiring terminals. Terminal
blocks shall be heavy-duty, strap-screw type. Terminal blocks for field
wiring shall be located in one place in each module and in the system
cabinet. Control wiring shall be extended to the terminal block location.
No more than two wires shall land on any terminal point. Where control
wiring is attached to the same point as power wiring, a separate terminal
shall be provided. If bus duct is used, bus stubs shall be provided where
bus duct enters cabinets.
1.3.3.9
Internal Assembly
The subassemblies shall be mounted in pull-out and/or swing-out trays where
feasible. Cable connections to the trays shall be sufficiently long to
allow easy access to all components. Where not feasible to mount
subassemblies in pull-out or swing-out trays, they shall be firmly mounted
inside the enclosure. Test points or logic indicators shall be labeled and
located on the front edge of the control logic cards, if used.
1.3.3.10
Cabinet Structure
UPS system shall be installed in cabinets of heavy-duty structure meeting
the NEMA PE 1 standards for floor mounting. UPS module cabinet shall be
structurally adequate for forklift handling or lifting. Removable lifting
eyes shall be provided on top of each cabinet. UPS module cabinet shall
have hinged and lockable doors on the front only, with assemblies and
SECTION 16265A
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