Справочник Пользователя для Emerson UPS Systems

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These are guidelines only and are superseded by local regulations and codes of practice where appli-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.

Cable Size

T&B Series 54000 

Two Hole

#8 AWG

54850BE

#6 AWG

256-30695-868

#4 AWG

256-30695-733

#2-3 AWG

54811BE

#1 AWG

54857BE

#1/0 AWG

256-30695-593

#2/0 AWG

54862BE

#3/0 AWG

54864BE

#4/0 AWG

54866BE

250kcmil

54868BE

300kcmil

54870BE

350kcmil

54872BE

400kcmil

54874BE

500kcmil

54876BE

600kcmil

54878BE

750kcmil

54880BE

Use the T&B crimping tools recommended for these types of lugs.