12 volts is not high voltage. Measles may reduce the dielectric strength of
the board. If the spacing is such that a dielectric breakdown may result,
caution is adviced. Now for the $64 question. Does the 12 volt line get hot?

Guy Ramsey
Senior Lab Technician / Instructor


E-Mail: [log in to unmask] <mailto:[log in to unmask]>
Ph: (610) 362-1200 x107
Fax: (610) 362-1290



-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Lum Wee Mei
Sent: Tuesday, April 24, 2001 3:41 AM
To: [log in to unmask]
Subject: [TN] IPC-A-600 : mealsing defect


I have some power card that experience mealsing along the 12V@1A sense trace
that is about 2cm long. I have checked through the IPC-A-600 which said that
mealsing is accepted for Class 1,2,3 except for high voltage application.

My problem is that IPC did not specify how value of this high voltage
application. My worry is that the measling will degrade with temperature as
this power card is used under hot environment with no ventilisation - inside
a
box. With two power modules on one side, the measling will get worse over a
period of time.

Can someone or IPC staff provide some guidance as what the optiminal high
voltage should be? I need this information very urgent and would appreciate
any
feedback.

Thanks a million!
Regards - Wee Mei

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