8.WIRING CONSIDERATIONS
8.1.Power Wiring
Refer to Site Planning Data (Appendix A) and the installation drawings. Determine AC currents for your system based on kVA, kW, voltage, and options. Also refer to equipment nameplate for the model number, rating, and voltage. For wire termination data, refer to Tables
1.Power wiring
CAUTION
Power and control wiring must be separated!
2.Observe local, state and national electrical codes. Verify utility power and its overcurrent protection rating will accommodate the UPS input rating, including battery recharging.
3.A safety ground wire must be run from building ground to ground point in the UPS Module Cabinet, the Battery Cabinet and the
a.The insulated grounding conductor must be sized in accordance with the NEC and local codes. It must be green (with or without yellow stripes) and be installed as part of the branch circuit that supplies the unit or system.
b.The grounding conductor described above is to be grounded to earth at the service equip- ment or, if supplied by a separately derived system, at the supply transformer or motor- generator set in accordance with the instructions in Section 7 of this Manual.
c.The
connected to earth ground at the service equipment.
4.Observe clockwise phase rotation of all power wiring. Phase A leads Phase B leads Phase C. A qualified electrician should check the phase rotation.
5.Power cables must be rated for less than 2 volts line drop at maximum rated system current.
6.Use 75°C copper wire. Select wire size based on the ampacities in Table
CAUTION
The weight of power cables must be adequately supported to avoid stress on bus bars and lugs. The following restraining method is recommended to both to support cable weight and control cable movement during external fault conditions: Wrap line cables together at 6 inches and 12 inches from the terminals with 5 wraps of 3/8 inch nylon rope or equivalent (tensile strength of 2000 pounds). Support remainder of cable with 5 wraps every 6 inches or 1 wrap every 1 inch.
7.If site equipment includes a backup generator and automatic transfer switch(es), consult the manufacturers of those devices for information on sizing and interfacing to the UPS system.
8.The installing contractor can remove the access plates from the top left or top right sides of the UPS in order to cut entry holes for conduit. For units with
CAUTION
After cutting holes in the access plates, be certain that no foreign matter (metal shavings, sawdust, insulation or wire fragments, etc.) remains inside the UPS. Likewise be certain to block any “extra” holes in the plates through which foreign matter could later enter the UPS.
Liebert Series 600T UPS, | 15 |