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990-4049
Installation Guide APC Silcon 240-320kW 480V UPS 21
Wiring
Select wire size based on the data in Table 1, and the ampacities in Table 2 of this manual, a
reprint of Table 310-16 and associated notes of the National Electrical Code (NFPA 70).
See section 8.0 Appendix.
Use commercially available UL approved solderless lugs for the wire size required for your
application. Connect wire to the lug using tool and procedure specified by the lug
manufacturer.
Input, output and DC cables are routed in separate conduits.
All AC cables rated 600V.
DC cables for 480V systems rated 1000V unless otherwise stated.
CAUTION!
Ensure correct phase rotation of utility input voltage! Max. power cable size: 500 kcmil.
NOTICE!
With a 3-wire input, the UPS can only be 3-wire loaded (Phase-to-phase).
NOTICE!
If an MCCB is used in stead of external input fuses, the MCCB load capacity must be 8xIn
(nominal current) for min.10 ms.
NOTICE!
Gland plate in bottom of system must be mounted.
CAUTION!
At a switch mode load of 100% the neutral must be rated for 173% output phase current.
NOTICE!
φ
“phase”
“risk of electric shock”
Terminal for Equipment Grounding Conductor
E
Terminal for Grounding Electrode Conductor
NOTICE!
Terminals marked and are electrically connected to the terminal marked “E”
NOTICE!
For grounding, refer to local legal regulations.
CAUTION!
Read warnings on page 2 of this manual before continuing.