I have found that the Class 2 length is typically the remaining length for common through hole parts after insertion and solder. Allowing the length to remain without cutting (either in line with the wave or following hand solder) eliminates MAJOR cost in terms of rework, touching up of fractured solder, or having to maintain an inline cutter. CAUTION: Pure conjecture follows! Our class 2 product is typically installed into systems that have less chassis congestion - is it possible that the system design follows a guideline as well relative to spacing of CCAs? (That might be one reason). The class 3 length brings back deja vu from military applications where it was .06" max. Jan Pelchat Benchmark Electronics > -----Original Message----- > From: fullname [SMTP:[log in to unmask]] > Sent: Tuesday, May 08, 2001 7:54 PM > To: [log in to unmask] > Subject: Re: [TN] IPC-A-610 Rev C - Question about wire/lead > protrusion > > Hi, Bob, > > You hit this question which I was about to check with IPC, too. Any reply > from your guys at > IPC? I am dying to know the rationale too, :) > > Regards - Wee Mei > > Bob Hawkins wrote: > > > Please reference Section 5.2.7.1 - Table 5-2 > > > > What is the rationale on the (L) max numbers for Class 2 (2.5mm) and > Class > > 3 (1.5mm) ??? > > > > Bob Hawkins > > > > > -------------------------------------------------------------------------- > ------- > > Technet Mail List provided as a free service by IPC using LISTSERV 1.8d > > 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 delivery of Technet send the following message: SET > Technet NOMAIL > > Search previous postings at: www.ipc.org > On-Line Resources & Databases > > E-mail Archives > > Please visit IPC web site (http://www.ipc.org/html/forum.htm) for > additional > > information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 > ext.5315 > > > -------------------------------------------------------------------------- > ------- > > -------------------------------------------------------------------------- > ------- > Technet Mail List provided as a free service by IPC using LISTSERV 1.8d > 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 delivery of Technet send the following message: SET > Technet NOMAIL > Search previous postings at: www.ipc.org > On-Line Resources & Databases > > E-mail Archives > Please visit IPC web site (http://www.ipc.org/html/forum.htm) for > additional > information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 > ext.5315 > -------------------------------------------------------------------------- > ------- --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d 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 delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------