We had a similar situation years ago. In our case, we used multiple vias off an enlarged track to help distribute the current. In our case, I believe, we had to handle about 30 amps. We used as many vias (~20) as we could fit into that area and never had a failure. Hope this helps somewhat. Larry Campbell Supervisor, PWB BFGoodrich, Avionics Systems >>> David Baldwin <[log in to unmask]> 06/19/98 01:24pm >>> Designers Council: I am designing a board which has heavy current devices, required to handle 10A max peak. The board will be constructed using 2 oz. copper. IPC-D-275 5.3.2.3. states: "Total cumulative copper web for all layers in any plated through hole should not exceed .160" for 1 oz. copper, or .080" for for 2 oz. copper. The total of the thermal relief cross sectional area divided by the number of planes connected to the plated through hole, shall not violate current carrying capacity requirements for a given hole. If the individual web width violates the intended minimum conductor width it shall be specified on the master drawing." If I use the web width calculations, or even the .080" max web width for 2 oz copper, it's not going to handle the current without getting really hot. If I connect the hole directly into the plane, we'll have a difficult time soldering it. What is your recommendations and experience with this type of situation? Thanks in advance for your advice and input. David Baldwin ____________________________________ PCB Designs by Baldwin Tech. (602) 812-9246 FAX (602) 812-9247 http://www.neta.com/~btech ____________________________________ ################################################################ DesignerCouncil E-Mail Forum 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 DesignerCouncil <your full name> To unsubscribe: SIGNOFF DesignerCouncil ################################################################ Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################ ################################################################ DesignerCouncil E-Mail Forum 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 DesignerCouncil <your full name> To unsubscribe: SIGNOFF DesignerCouncil ################################################################ Please visit IPC web site (http://jefry.ipc.org/forum.htm) for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################