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Notes
See the Liebert NXL UPS installation manual, SL-25420, for UPS rectifier, UPS bypass and UPS out-
put sizes. The manual is available at the Liebert Web site:
These are guidelines only and are superseded by local regulations and codes of practice where appli-
cable.
• Take special care when determining the size of the neutral cable, as current circulating on the
neutral cable may be greater than nominal current in the case of non-linear loads. Refer to the
values given in the Tables 7 and 8.
• The ground conductor should be sized according to the fault rating, cable lengths, type of protec-
tion, etc. The ground cable connecting the UPS to the main ground system must follow the most
direct route possible.
• Consideration should be given to the use of smaller, paralleled cables for heavy currents, as a way
to ease installation.
• In most installations, the load equipment is connected to a distribution network of individually
protected busbars fed by the maintenance bypass cabinet output rather than being connected
directly to the Maintenance bypass cabinet itself. Where this is the case, the maintenance bypass
cabinet output cables can be rated to suit the individual distribution network demands rather
than being fully load-rated.
• When laying the power cables, do not form coils to avoid increasing formation of electromagnetic
interference.
Table 15
Recommended lug sizes
Cable Size
#8 AWG
#6 AWG
#4 AWG
#2-3 AWG
#1 AWG
#1/0 AWG
#2/0 AWG
#3/0 AWG
#4/0 AWG
250kcmil
300kcmil
350kcmil
400kcmil
500kcmil
600kcmil
750kcmil
Use the T&B crimping tools recommended for these types of lugs.
T&B Series 54000
Two Hole
54850BE
256-30695-868
256-30695-733
54811BE
54857BE
256-30695-593
54862BE
54864BE
54866BE
54868BE
54870BE
54872BE
54874BE
54876BE
54878BE
54880BE
29
www.liebert.com
Specifications
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