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Table 15 Recommended conduit and cable sizes for Liebert NXL Module Battery Disconnect
UPS
Size,
kVA
Nominal Selection Alternate Selection
Top Cable Entry Input
Wire & Conduit
Wires, G THW / FMC
Bottom Cable Entry Input
Wire & Conduit
Wires, G THW / RNC
Top Cable Entry Input
Wire & Conduit
Wires, G THW / FMC
Bottom Cable Entry Input
Wire & Conduit
Wires, G THW / RNC
250kVA
(2) 2.5C 2-350kcmil,
#1/0AWG
(3) 2C 2-#4/0AWG,
#1/0AWG
(2) 2.5C 2-350kcmil,
#1/0AWG
(3) 2C 2-#4/0AWG,
#1/0AWG
300kVA
(2) 2.5C 2-500kcmil,
#1/0AWG
(3) 2C 2-250kcmil,
#1/0AWG
(2) 2.5C 2-500kcmil,
#1/0AWG
(3) 2C 2-250kcmil,
#1/0AWG
400kVA
(3) 2.5C 2-500kcmil,
#4/0AWG
(4) 2.5C 2-250kcmil,
#4/0AWG
(3) 2.5C 2-500kcmil,
#4/0AWG
(4) 2.5C 2-250kcmil,
#4/0AWG
500kVA
(4) 3C 2-750kcmil,
#4/0AWG
(4) 3.5C 2-750kcmil,
#4/0AWG
(5) 2.5C 2-500kcmil,
#4/0AWG
(5) 3C 2-500kcmil,
#4/0AWG
625kVA
(4) 3C 2-750kcmil,
#4/0AWG
(4) 3.5C 2-750kcmil,
#4/0AWG
(5) 2.5C 2-500kcmil,
#4/0AWG
(5) 3C 2-500kcmil,
#4/0AWG
750kVA
(5) 3.5C 2-750kcmil,
250kcmil
(5) 3.5C 2-750kcmil,
250kcmil
(6) 3C 2-500kcmil,
250kcmil
(6) 3C 2-500kcmil,
250kcmil
The recommendations in this table are guidelines only and are superseded by local regulations and codes of practice where applicable:
1. 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 the UPS electrical characteristics in this table.
2. 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.
3. Consideration should be given to the use of paralleled smaller cables for heavy currents, as this can ease installation considerably.
4. When laying the power cables, do not form coils. Coiling power cables increases the likelihood of electromagnetic interference.
Table 16 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)
WR UPS12-490MR 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)
Table 17 Torque specifications, unless otherwise labeled
Nut and Bolt Combinations
Bolt Shaft Size
Grade 2 Standard
lb-in (Nm)
Electrical Connections
with Belleville Washers
lb-in (Nm)
1/4 53 (6.0) 46 (5.2)
5/16 107 (12) 60 (6.8)
3/8 192 (22) 95 (11)
1/2 428 (48) 256 (29)
Circuit Breakers with Compression Lugs (For Power Wiring)
Current Rating lb-in (Nm) —
400 - 1200 Amps 300 (34) —
Circuit Breakers with Compression Lugs (For Control Wiring)
AWG Wire Size or Range lb-in (Nm) —
#22 - #14 3.5 to 5.3 (0.4 to 0.6) —