Amada Miyachi Unitek STA-100A, Operation Manual, Page: 93 / 154

APPENDIX C: SCR, WIRE GAUGE, AND CIRCUIT BREAKER SELECTION
STA SERIES AC CONTROLS
990-351 C-
3
Wire Gauges Based on Demand (kVA)
For wire gauge needed to support a maximum of 5% voltage drop, consult table C-4. The information
herein is based on NFPA70 National Electric Code table 9 in Chapter 9. The calculations are based on a
30% power factor and 100 foot power cable run.
Wire Gauge Based on Demand 240V AC Mains
Demand kVA 240 Max Zw Max Rw Max XLw AWG (Cu)
10 42 2.880E-01 8.640E-01 2.758E+00 8
15 63 1.920E-01 5.760E-01 1.839E+00 6
20 83 1.440E-01 4.320E-01 1.379E+00 4
30 125 9.600E-02 2.880E-01 9.195E-01 3
50 208 5.760E-02 1.728E-01 5.517E-01 1
75 313 3.840E-02 1.152E-01 3.678E-01 2/0
100 417 2.880E-02 8.640E-02 2.758E-01 3/0
150 625 1.920E-02 5.760E-02 1.839E-01 250
175 729 1.646E-02 4.937E-02 1.576E-01 300
200 833 1.440E-02 4.320E-02 1.379E-01 350
250 1042 1.152E-02 3.456E-02 1.103E-01 400
300 1250 9.600E-03 2.880E-02 9.195E-02 2x250
350 1458 8.229E-03 2.469E-02 7.881E-02 2x300
400 1667 7.200E-03 2.160E-02 6.896E-02 2x350
500 2083 5.760E-03 1.728E-02 5.517E-02 2x500