Bill, I just went through this exercise and here is what I found : IPC-R-700 defines several methods for applying jumper wires based on material or contact/surface and other things. IPC-A-610 (9.3) says they are acceptable for type 1,2,3 boards. IPC-D-275 (4.8) says jumpers are considered a component and need to be documented as such, but are again acceptable on all types, including military applications. What I determined was essentially, as long as jumpers are done correctly there is no stated limit I could find. If you happen to get some other data, I'd appreciate a quick note and point me to it. Hope this helps..........DT At 03:43 PM 5/20/98 -0400, you wrote: > Could you tell me how many "jumper wires" or >"haywires" are allowed on a Printed Circuit Card >Assembly, Class 3, High Reliability & what spec >they are covered by???? > >Bill Burke >Printed Circuit Board Designer >Lockheed Martin Fairchild Systems >300 Robbins Lane >Syosset, New York 11791-6012 >Voice: (516) 349-2454 >Intra-Company *8-349-2454 >Fax: (516) 931-4037 >email: [log in to unmask] > [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 >################################################################ > > > ################################################################ 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 ################################################################