Power Terminals And Cable Sizing - Toshiba 5000 SERIES Installation And Operation Manual

9.3

Power Terminals and Cable Sizing

Note: Always consult your site specific, local, state, and NEC electrical codes for wiring, cabling, and circuit
protection device requirements.
The Input/Output bus stubs for the UPS are shown in Figure 9.1.
Use only copper wires for external cables. See Appendix D for alternate voltage and cabling configurations.
The tables below show the recommended cable sizing for the basic 208/120Vin, 208/120Vout UPS
configuration, and a 480V unit. For other Input/Output volage Cabling recommendatons, see Appendix D.
TABLE 9.2: RECOMMENDED TIGHTENING TORQUE FOR 5000 SERIES POWER LUGS
Bus Stub
All power and neutral
cable lugs
TABLE 9.3: RECOMMENDED CABLE SIZE FOR 120/208V IN, 120/208V OUT
Bus Stub
AC Input A, B, C
AC Input Neutral (N)
2
AC Output A, B, C
AC Output Neutral (N)
2
Secondary Input A, B, C
Secondary Neutral (N)
2
Battery Terminals +/-
1
One battery string. (Consult factory if using more than one battery string.)
1
Size neutral cable appropriate to actual load type: e.g. balanced, unbalanced, non-linear.
2
TABLE 9.4: RECOMMENDED CABLE SIZE FOR 480V IN, 480/277V OUT
Bus Stub
AC Input A, B, C
AC Input Neutral (N)
2
AC Output A, B, C
AC Output Neutral (N)
2
Secondary Input A, B, C
Secondary Neutral (N)
2
Battery Terminals +/-
1
One battery string. (Consult factory if using more than one battery string.)
1
Size neutral cable appropriate to actual load type: e.g. balanced, unbalanced, non-linear.
2
NOTE: Cable sizing for ambient operating temperatures other than
derating per the correction factors in the NEC Handbook Table 310.16
5000 Series NEMA-3R 3-Phase UPS Installation and Operation Manual – 92975-000
Fastener
Tightening Torque
3/8 bolt
Cable Size (Min-Max) 75 °C Copper Wire in Conduit
20kVA
#3 – #2
2/0 – 3/0
#3 – #2
2/0 – 3/0
#3 – #2
2/0 – 3/0
#3 – #2
Cable Size (Min-Max) 75 °C Copper Wire in Conduit
20kVA
#8 – #6
–
#8 – #6
#4 – #3
#8 – #6
#4 – #3
#3 – #2
2
18 - 22 Lb-Ft
(24.4 - 71.9 Nm)
@ 84 °F (30 °C) Ambient
30kVA
1/0 – 2/0
4/0 – 250 kcmil
1/0 – 2/0
4/0 – 250 kcmil
1/0 – 2/0
4/0 – 250 kcmil
#1 – 1/0
@ 84 °F (30 °C) Ambient
30kVA
#6 – #4
–
#6 – #4
#3 – #2
#6 – #4
#3 – #2
#1 – 1/0
84 °F (30 °C) will require
31