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Effects of Emissivity and Number of Copper Busses on Ampacity

Number or 1/4 x 4" Busses* Ampacity, Amp
  30 °C Rise 50 °C Rise 65 °C Rise
  Emissivity Emissivity Emissivity
  0.15 0.40 0.70 0.90 0.15 0.40 0.70 0.90 0.15 0.40 0.70 0.90
1 1100 1250 1400 1600 1500 1700 1900 2000 1700 1950 2200 2300
2 1900 2050 2200 2300 2550 2750 2950 3100 2950 3200 3400 3600
3 2500 2700 2850 3000 3400 3600 3850 4000 3950 4200 4500 4600
4 3100 3300 3450 3600 4200 4400 4700 4800 4900 5100 5400 5600