Currently we need information on spacing for innerlayers and outerlayer for using 48V. DC nominal voltage planes. There are guidelines in IPC-D-275, but we have had failures in the past with this voltage and the suggested spacing. This product should continue functioning for at least 15 years. So far, I have not found out what the max. peak voltage will be so any answers should indicate not only the spacing at this voltage, but a volts/mil. for 48V. and above. I would appreciate any input and the logic/experience behind your recommendations! [log in to unmask] ################################################################ 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 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 ################################################################