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4.3.1 Recommended Wire Size and Torque Requirements For UPS Input and
Output Terminals
Minimum Wire Size and Torque Requirements
UPS Input and Output Terminals 50 kVA
(USE MINIMUM 75 °C INSULATED COPPER WIRING)
INPUT:
OUTPUT:
(H1) (H2) (H3) AWG
(L1)(L2)(L3) Tightening
NEUTRAL
AWG
AWG
NEUTRAL
AWG
Torque
208 V 1/0 250MCM 208/120 V 1/0 250MCM 200 in-lbs.
220 V 1/0 4/0 220/127 V 1/0 4/0 200 in-lbs.
240 V 1 N/A 240 V 1 N/A 200 in-lbs.
380 V 4 1/0 380/220 V 4 1/0 200 in-lbs.
400 V 4 1/0 400/230 V 4 1/0 200 in-lbs.
415 V 4 1 415/240 V 4 1 200 in-lbs.
480 V 6 2 480/277 V 6 2 200 in-lbs.
600 V 6 N/A 600 V 6 N/A 200 in-lbs.
All wire sizes are per the NEC. Maximum Wire Size for Input and Output is 1/0 AWG.
Neutral Conductors are rated @ 1.73 or 200% of phase conductors, per NEC. Maximum Wire Size for Neutral
is 250MCM.
50 kVA
Input/ Output (GND)
AWG Tightening Torque
208-240 VAC 6 200 in-lbs.
380-480 VAC 6 200 in-lbs.
600 VAC 8 200 in-lbs.
Battery (+) / (-) 50 kVA
AWG Tightening Torque
(+) (-) 250MCM 200 in-lbs.
Maximum Wire Size for Battery is 250MCM.
Minimum Wire Size and Torque requirements
UPS Optional Bypass Input Terminals TB4 50 kVA
(USE MINIMUM 75 °C INSULATED COPPER WIRING)
50 kVA Phase: (A) (B) (C)
Input: (H1) (H2) (H3)
AWG NEUTRAL AWG Tightening Torque
208/120 V 1/0 250MCM 200 in-lbs.
220 V 1/0 4/0 200 in-lbs.
240 V 1 N/A 200 in-lbs.
380 V 4 1/0 200 in-lbs.
400 V 4
1/0
200 in-lbs.
415 V 4 1 200 in-lbs.
480 V 6 2 200 in-lbs.
600 V 6 N/A 200 in-lbs.
Maximum Wire Size for Input is 1/0 AWG. Maximum Wire Size for Neutral is 250MCM.
4200FA CT/XT User’s Manual 26