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Table 2-1: 480 VAC Input and 208 VAC Output Wire Size Chart.
Unit Size Input Input Minimum Maximum
in kVA Breaker Wire Ground Wire Output
Size Size Size Current
10 15 Amp #10 #10 28
15 25 Amp #10 #8 42
25 50 Amp #8 #4 70
30 50 Amp #8 #4 83
45 80 Amp #6 #2 125
50 80 Amp #6 #2 139
75 125 Amp #1 #6 208
100 150 Amp 1/0 4/0 278
125 200 Amp 1/0 2 pcs 1/0 347
150 225 Amp 1/0 2 pcs 2/0 417
225 350 Amp 4/0 2 pcs 250 625
300 500 Amp 2 pcs 2/0 3 pcs 250 833
Table based on 480 VAC input and 208 VAC output.
Table 2-2: 208 VAC Input and 208 VAC Output Wire Size Chart.
Unit Size Input Input Minimum Maximum
in kVA Breaker Wire Ground Wire Output
Size Size Size Current
10 40 Amp #8 #10 28
15 60 Amp #8 #8 42
25 110 Amp #4 #4 70
30 110 Amp #4 #4 83
45 175 Amp #1 #2 125
50 175 Amp #1 #2 139
75 300 Amp 2/0 2/0 208
100 350 Amp 4/0 4/0 278
125 450 Amp 2 pcs 1/0 2 pcs 1/0 347
150 600 Amp 2 pcs 3/0 2 pcs 3/0 417
225 800 Amp 2 pcs 250 2 pcs 250 625
300 1200 Amp 3 pcs 250 3 pcs 250 833
Table based on 208 VAC input and 208 VAC output.
NOTE: Refer to NEC for output wire size based on output breaker size and Article 310
Section 8A.
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Installation and User Manual
86-108814-00 B01