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

9.4

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 30-50kVA UPS are shown in Figure 9.2. The bus stubs have been pre drilled to
accommodate NEMA 2-Hole terminal lugs with 0.56 in dia. holes on 1.75 in Centers. Thepower terminal block for the 15kVA
UPS is shown in Figure 9.3.
Use only copper wires for external cables.
The tables below show the recommended cable sizing for the 3-Phase, 3-Wire, 480Vin and Single-Phase,120Vout.
TABLE 9.4: RECOMMENDED TIGHTENING TORQUE FOR 5000 SERIES POWER LUGS
TABLE 9.5: RECOMMENDED CABLE SIZE FOR 480V IN, 120/V OUT
Bus Stub
480V Input A, B, C
120V Output A, B
120V Bypass Input A, B
120V Battery Terminals +/-
One battery string. (Consult factory if using more than one battery string.)
1
NOTE: Cable sizing for ambient operating temperatures other than
correction factors in the NEC Handbook Table 310.16
A
480V 3P-3W
NOTE: The INPUT, SECONDARY INPUT, DC INPUT, and OUTPUT bus stubs are all
drilled to accept NEMA 2-Hole terminal lugs with 3/8 in. bolt holes on 1.75 in. centers.
32
Bus Stub
All power and neutral
cable lugs
#10 AWG
2 x #3 – #1/0 AWG
2 x #3 – #1/0 AWG
2 x #4 – 1 x #2/0
1
B C
L
INPUT BYPASS INPUT
120V 1P-2W
FIGURE 9.2: 50/40 & 30KVA POWER BUS DETAIL
5000 Series 3P1 Industrial UPS Installation and Operation Manual – 92973-001
Fastener
1/2 in. bolt
Cable Size (Min) 75 °C Copper Wire in Conduit
15kVA
2x #3/0 – 300 kcmil
2x #3/0 – 300 kcmil
N
L N
OUTPUT
120V 1P-2W
Tightening Torque
40 Lb-Ft
(54.2 Nm)
@ 84 °F (40 °C) AMBIENT
30kVA
#6 AWG
2 x #2/0
84 °F (40 °C) will require derating per the
+ –
BATT BACKUP
120VDC
50kVA
#4 AWG
2 x 300 kcmil
2 x 300 kcmil
2 x 300 kcmil
G