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31 Liebert
®
NX
™
Table 8 Recommended conduit and cable sizes from Liebert NX UPS to DC supply
UPS Rating
kVA
(#) Conduit Size, Ph, G
225 (2); 2C; 2-500kcmil, #1/0AWG
250 (2); 2C; 2-600kcmil; #1/0AWG
300 (2); 2.5C; 2-600kcmil; #2/0AWG
400 (3); 2.5C; 2-600kcmil; #3/0AWG
500 (3); 2.5C; 2-750kcmil; #4/0AWG
600 (5); 2.5C; 2-600kcmil; 250kcmil
The recommendations in this table are guidelines only and are superseded by local regulations and codes of practice where
applicable:
1. Recommended cable sizes are 75C (THW) wire at 86°F (30°C) ambient.
2. For continuous operations not at 86°F (30°C), Emerson recommends selecting the appropriate cable type based on the particular
installation requirements.
3. 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.
4. When laying the power cables, do not form coils. Coiling power cables increases the likelihood of electromagnetic interference.
Table 9 Battery torque values
Battery
Code Manufacturer Battery Model
Torque Value
in-lb (Nm)
PR
C&D Batteries
UPS12-300MR 110 (12.4)
RR UPS12-350MR 110 (12.4)
UR UPS12-400MR 110 (12.4)
WS UPS12-490MRLP 110 (12.4)
XR UPS12-540MR 110 (12.4)
PX
Enersys
HX300-FR 65 (7.3)
RX HX330-FR 65 (7.3)
UX HX400-FR 65 (7.3)
WX HX500-FR 65 (7.3)
XX HX540-FR 65 (7.3)
2K 16HX800F 100 (11.3)
4K 16HX925F 100 (11.3)
QA
East Penn
27HR3500 65 (7.3)
SA 31HR4000 65 (7.3)
WA 31HR5000 65 (7.3)
YA HR5500 65 (7.3)