When the first chart was created in the ’s, there were no multilayer boards and all of the data was taken from surface traces IPC Calculator. Simply enter your required temperature rise limits and operating current (RMS). For example, a conductor estimated to have aC rise calculated using the IPC charts will have a temperature rise closer to 9C when aoz copper plane (5-in xin THE HISTORICAL CHART. Contact: IPC Lakeside Drive, Suite S Bannockburn, Illinois TelFaxTable of Contents THE HISTORICAL