30 amps can be carried by a 0.9" wide 2 oz Cu trace with a <10F temperature rise in single layer flex. A multi-layer rigid board may build up more heat over time because of the heat transfer differences. These relationships are implemented in software posted at: http://www.geocities.com/CapeCanaveral/Launchpad/9641/program/program.html Andy Magee Flex Guru - Consulting [log in to unmask] (937) 435-3629 Lum Wee Mei wrote, We are asked to carry out a high current layout design. The PCB layer is expected to be at least 10-12 layer with 2oz copper per layer. The layer count could be less . The PCB consists of some terminating blocks that can handle as high as 150Amp with some HDC connectors whose pin is expected to carry at least 7.5Amp per connector pin. We intend to route each connector pin out and joined them using area fill. However, the engineer is questionable whether the large area fill can support 30Amp? I would appreciate some help in this design on the followings or others : How wide should the trace width be? How many layer is consider sufficient if 2oz copper is used per layer? How do one calculate the current carrying capacity of the trace, especially in this design? Thanking in advance to all who response to my queries. ################################################################ TechNet 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 TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################