Copper Emissivity Chart Effect of Emissivity and Number of Busses on Ampacity - Data here show how higher emissivities improve ampacity. Multiple busses also affect ampacity in a nonlinear relationship. Ampacity may be raised by increasing heat dissipation through the use of convection cooling or surface treatments. Surface treatments which improve emissivity are available. Number of 1/4 x 4in. Busses* Ampacity, Amp 30°C Rise 50°C Rise 65°C Rise Emissivity Emissivity Emissivity   0.15 0.4 0.7 0.9 0.15 0.4 0.7 0.9 0.15 0.4 0.7 0.9 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 * 1/4 in. spacing. Ampacities of bus bar systems of other configurations must be calculated, taking into account size, spacing, number of bus bars and overall skin-effect ratio. Other Bus Bar Links Aluminum Bus Bar General Information Aluminum Bus Bar Chart Copper Bus Bar Quick Selector Copper Bus Bar General Information Copper Bus Bar Ampacity Chart Copper Bus Bar DC Ampacity Copper Bus Bar Horizontal Properties Copper Bus Bar Vertical Properties
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