Table 10 Recommended Conduit And Cable Sizes-Module Output; Table 11 Recommended Conduit And Cable Sizes-Load Output; Table 12 Recommended Conduit And Cable Sizes-Load Bank Output - Liebert NXL Installation Manual

Table 10 Recommended conduit and cable sizes—Module Output
UPS Rating Voltage (VAC)
Input, Bypass
kVA kW and Output
6-Pulse Plus Filter Design
250 225 480
300 270 480
400 360 480
500 450 480
Table 11 Recommended conduit and cable sizes—Load Output
UPS Rating Voltage (VAC)
Input, Bypass
kVA kW and Output
6-Pulse Plus Filter Design
250 225 480
300 270 480
400 360 480
500 450 480
Table 12 Recommended conduit and cable sizes—Load Bank Output
UPS Rating
Voltage (VAC)
Input, Bypass
kVA kW and Output
6-Pulse Plus Filter Design
250 225
300 270
400 360
500 450
Notes on Tables 7 through 12
See the Liebert NXL UPS installation manual, SL-25420, for UPS rectifier, UPS bypass and UPS
output 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These are guidelines only and are superseded by local regulations and codes of practice where
applicable.
• Take special care when determining the size of the neutral cable, because 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
Tables 8 through 13. For three-wire systems, the neutral cables and conduit are not required.
• The ground conductor should be sized according to the fault rating, cable lengths, type of protection, 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.
®
Vertiv | Liebert NXL
(#) Conduit Size, Ph, N,G
(2) 3C 3-250kcmil, 2-250kcmil, #1/0AWG
(2) 3.5C 3-350kcmil, 2-350kcmil, #1/0AWG
(2) 4C 3-500kcmil, 2-500kcmil, #1/0AWG
(3) 3.5C 3-500kcmil, 2-250kcmil, #1/0AWG
(#) Conduit Size, Ph, N,G
(2) 3C 3-250kcmil, 2-250kcmil, #1/0AWG
(2) 3.5C 3-350kcmil, 2-350kcmil, #1/0AWG
(2) 4C 3-500kcmil, 2-500kcmil, #1/0AWG
(3) 3.5C 3-500kcmil, 2-250kcmil #1/0AWG
480
480
480
480
™ ™
MBC 250-500kVA Installation Manual |
Module Output
Nominal Selection
Load Output
Nominal Selection
Load Bank Output
Nominal Selection
(#) Conduit Size, Ph, N,G
(1) 3-500kcmil, #1/0AWG
(2) 3-#4/0AWG, #1/0AWG
(2) 3-350kcmil, #1/0AWG
(2) 3-500kcmil, #1/0AWG
www.liebert.com
Specifications
26