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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:
AWG
(L1)(L2)(L3) Tightening
(H1) (H2) (H3)
NEUTRAL
AWG
AWG
NEUTRAL
AWG
Torque
208 1/0 250MCM 208/120 1/0 250MCM 200 in-lbs.
220 1/0 4/0 220/127 1/0 4/0 200 in-lbs.
240 1 N/A 240 1 N/A 200 in-lbs.
380 4 1/0 380/220 4 1/0 200 in-lbs.
400 4 1/0 400/230 4 1/0 200 in-lbs.
415 4 1 415/240 4 1 200 in-lbs.
480 6 2 480/277 6 2 200 in-lbs.
600 6 N/A 600 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
208-240VAC 6 200 in-lbs.
380-480VAC 6 200 in-lbs.
600VAC 8 200 in-lbs.
50 kVA
Battery (+) / (-)
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 1/0 250MCM 200 in-lbs.
220 1/0 4/0 200 in-lbs.
240 1 N/A 200 in-lbs.
380 4 1/0 200 in-lbs.
400 4
1/0
200 in-lbs.
415 4 1 200 in-lbs.
480 6 2 200 in-lbs.
600 6 N/A 200 in-lbs.
Maximum Wire Size for Input is 1/0 AWG. Maximum Wire Size for Neutral is 250MCM.