Vertiv™ | Liebert® EXM
™
50-250kVA, 480V, 60Hz User Manual | 23
3.2.4 Cabling Guidelines
The following are guidelines only and are superseded by local regulations and codes of practice
where applicable. Use wiring rated at 75°C or greater.
1. The ground conductor should be sized according to such factors as the fault rating, cable lengths and
type of protection. The ground cable connecting the UPS to the main ground system must follow the most
direct route possible. Control wiring and power wiring must be run in separate conduit. Output and input
cables must be run in separate conduit.
2. Consider using paralleled smaller cables for heavy currents—this can ease installation.
3. Refer to SL-25656, the battery cabinet user manual, which shipped with the battery cabinet and is
available at Vertiv’s
™
Web site (www.vertivco.com), for guidelines and instructions when sizing battery
cables.
4. In most installations, the load equipment is connected to a distribution network of individually protected
busbars fed by the UPS output, rather than connected directly to the UPS itself. When this is the case, the
UPS output cables can be rated to suit the individual distribution network demands rather than being
fully load-rated.
5. Do not form coils when laying power cables; this will help avoid increasing formation of electromagnetic
interference.
3.2.5 Cable Connections
The rectifier input, bypass, output and battery are easily accessible from the front of the unit for
installation. All require lug type terminations. They are connected to busbars on the front of the
Liebert
®
EXM
™
, as shown in Figure 9. These busbars are accessible when the I/O panel is
removed.
NOTICE
Risk of improper installation. Can cause equipment damage.
When wiring a single-input only system, connect only the power wiring to the input busbars.
NOTE
If more load is added to the distribution panel, the unit’s cabling must
be resized.
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