Hello, I'm hoping someone can verify this for me. In order to prevent arcing on a board running 12-16vdc, 23 amps, to be used in external weather conditions, 95% humidity ( I don't know the temperature above ambient ), what should the minimun conductor width and spacing be? According to IPC-D-275, the minimun conductor spacing should be 25 mils. This seems so small to me, especially if the conductor width minimum is somewhere between 140-300 mils. Can anyone give me a good guess on what to use? Is 25 mils enough to prevent arcing here? Thank You So Much, Kitty Hines ################################################################ 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 the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ################################################################