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4300 Series Ancillary Cabinets Installation and Operation Manual
Table 10.3 - 431A Input/Output Power Cable Sizes
(Cable sizes for 75°C Copper Cable)
Recommended/Maximum Wire size and Torque Requirement
Trans-
former
Code Input/Output Trans-
former Voltage
Xfmr Type 30 kVA 50 kVA Tightening
Torque
Phase AWG* Neutral AWG* Phase AWG* Neutral AWG*
Input B
208VΔto208/120VY Input Iso 2 - 250 kcmil N/A 2/0 - 250 kcmil N/A 200 in.-lbs.
C
240VΔto208/120VY Input Iso 3 - 250 kcmil N/A 1/0 - 250 kcmil N/A 200 in.-lbs.
N
380VΔto208/120VY Input Iso 6 - 250 kcmil N/A 3 - 250 kcmil N/A 200 in.-lbs.
N
400/415VΔto208/120VY Input Iso 6 - 250 kcmil N/A 3 - 250 kcmil N/A 200 in.-lbs.
S
480VΔto208/120VY Input Iso 6 - 250 kcmil N/A 4 - 250 kcmil N/A 200 in.-lbs.
M
600VΔto208/120VY Input Iso 6 - 250 kcmil N/A 6 - 250 kcmil N/A 200 in.-lbs.
X
208/120V Y 4 wire input
(No Transformer)
N/A 1/0 - 250 kcmil 4/0 - 350 kcmil 250 kcmil 350 kcmil 200 in.-lbs.
K
480/277V Y to 208/120V Y Input Auto 6 - 250 kcmil 3 - 350 kcmil 3 - 250 kcmil 2/0 - 350 kcmil 200 in.-lbs.
Output F
208/120V Y 4 wire input
(No Transformer)
N/A 1/0 - 250 kcmil 4/0 - 350 kcmil 250 kcmil 350 kcmil 200 in.-lbs.
H
208/120V Y to 220/127V Y Output Auto 1 - 250 kcmil 4/0 - 350 kcmil 4/0 - 250 kcmil 350 kcmil 200 in.-lbs.
J
208/120V Y to 240/139V Y Output Auto 2 - 250 kcmil 3/0 - 350 kcmil 3/0 - 250 kcmil 350 kcmil 200 in.-lbs.
P
208/120V Y to 380/220V Y Output Iso 4 - 250 kcmil 1 - 350 kcmil 1 - 250 kcmil 4/0 - 350 kcmil 200 in.-lbs.
Q
208/120V Y to 400/230V Y Output Iso 4 - 250 kcmil 1 - 350 kcmil 2 - 250 kcmil 3/0 - 250 kcmil 200 in.-lbs.
K
208/120V Y to 480/277V Y Output Auto 6 - 250 kcmil 3 - 350 kcmil 3 - 250 kcmil 2/0 - 250 kcmil 200 in.-lbs.
M
208/120V Y to 600/347V Y Output Iso 6 - 250 kcmil 4 - 350 kcmil 4 - 250 kcmil 1/0 - 250 kcmil 200 in.-lbs.
* Wire capacity for Phase lugs is 250 kcmil - 6 AWG, Neutral lugs is 350 kcmil - 6 AWG.