Just like the tax code, subject to interpretation. Holes that are subject to soldering, to me, are holes with leads in them. I now believe all vias can be direct connect based on section IPC-2221A 9.1.3 & IPC-A-610B section 4.2.4. "When solder has not wetted side of holes, it should be considered a process indicator as per J-STD-001. There is no nonconforming defect condition for this." At 12:06 PM 4/6/2009, you wrote: >Try IPC-2221A 9.1.3 The first sentance pretty much says what you said.. > >Allen Maddox, CID+ > >Allen Maddox Printed Circuit Board Designs and Services ><http://www.maddoxpcb.com/>www.maddoxpcb.com >http://www.linkedin.com/in/trailsitter > > > >[] > > > > >From: Dee Stover <[log in to unmask]> >To: [log in to unmask] >Sent: Monday, April 6, 2009 2:58:40 PM >Subject: [DC] when do vias require a thermal relief > >Where in IPC does it specify when a via connected to a plane must >have thermal relief as opposed to direct connect? > >I would think it would have more to do with the assembly process >than the fabrication process. For instance - wave, dip or drag soldering. > >You input is appreciated. > >Thanks, > >:-) Dee Stover <mailto:[log in to unmask]>[log in to unmask] x8489 >Tech Associate II >National Optical Astronomy Observatories ><http://www.noao.edu/>www.noao.edu >--------------------------------------------------------------------------------- >DesignerCouncil Mail List provided as a free service by IPC using >LISTSERV 1.8d >To unsubscribe, send a message to ><mailto:[log in to unmask]>[log in to unmask] with following text in >the BODY (NOT the subject field): SIGNOFF DesignerCouncil. >To temporarily stop/(restart) delivery of DesignerCouncil send: SET >DesignerCouncil NOMAIL/(MAIL) >Search previous postings at: <http://www.ipc.org/>www.ipc.org > >On-Line Resources & Databases > E-mail Archives >Please visit IPC web site >http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional >information, or contact Keach Sasamori at ><mailto:[log in to unmask]>[log in to unmask] or 847-615-7100 ext.2815 >--------------------------------------------------------------------------------- >------------------------------------------------------------------------------- >DesignerCouncil Mail List provided as a service by IPC using LISTSERV 1.8e >To unsubscribe, send a message to [log in to unmask] with following >text in the BODY (NOT the subject field): >SIGNOFF DesignerCouncil >To temporarily stop/(start) delivery of DesignerCouncil for vacation >breaks send: SET DesignerCouncil NOMAIL/(MAIL) >Search previous postings at: http://listserv.ipc.org/archives >Please visit IPC web site >http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional >information, or contact Keach Sasamori at [log in to unmask] or >847-615-7100 ext. 2815 >------------------------------------------------------------------------------- :-) Dee Stover [log in to unmask] x8489 Tech Associate II National Optical Astronomy Observatories www.noao.edu --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------