>One of my customers asked if there is a formula to figure the needed >width of a trace, given a specified copper weight, for the amount of >power he wants to put through it. >Second, what spacing does he need between these traces? Jeff Use the charts in figure 3-4 in IPC-D-275, Keep TEMP-RISE less than 10 degree C. Use table 3-1for spacing. If customer wishes to compare to wire sizes use cross section numbers from figure 3-4. Rodney My opinions are mine. Bad spellers UNTIE! \__________(*)__________/ ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ##############################################################