Mick Bryant wrote:
"I would like to talk to anyone who is designing to the European CE-Low
Voltage Directive safety requirements and IPC manufacturing guidelines?  IPC
allows surface mount components to overhang the surface mount lands.  Do you
include this mfg. tolerance into your LVD design spacing requirements?  If
the manufacturing process is controlled should you see component overhang?"

        Absolutely, you should include the overhang tolerancing in your
spacing requirements.  CE will check clearances between metallization of
components as well as creepages between lands.  The manufacturing process
tolerances are functions of several factors, including pad geometries, pick &
place machine accuracy, etc.  It is possible to have have your processes
under control, but still see overhang if your pad geometries are tighter than
your pick & place machine accuracy .

################################################################
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's web site (http://www.ipc.org) "On-Line Services" section for additional information.
For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312
################################################################