The spec for edge spacing is in IPC-2222 paragraph 10.1.1. It calls for
0.4mm (0.016") plus the minimum electrical clearance required per IPC-2221
table 6.1.

Hope this helps,

Jeffrey A McGlaughlin, CID
Engineering Designer
Battelle Memorial Institute
Columbus Ohio
http://www.battelle.org
[log in to unmask]


-----Original Message-----
From: Whittaker, Dewey (AZ75) [mailto:[log in to unmask]]
Sent: Tuesday, September 09, 2003 10:45 AM
To: [log in to unmask]
Subject: Re: [TN] Board edge to circuit spacing / IPC-2221 ?


Robert,
To quote "Mountain Dew" Doug; it depends.For our Aerospace applications,we
require a minimum of 0.025 inches from edge of PWB to any internal
conductive entity.Given a 0.015 inch profile tolerance,based on a basic
outline dimension(max),the minimum design distance would be 0.040 inches.
For external requirements it would be 0.075 inches.This allows for
processing(fixturization,depanelization,testing) with a 0.060 inch minimum
and the 0.015 profile tolerance. Dewey

> -----Original Message-----
> From: Robert Coburn [SMTP:[log in to unmask]]
> Sent: Tuesday, September 09, 2003 7:21 AM
> To:   [log in to unmask]
> Subject:      [TN] Board edge to circuit spacing / IPC-2221 ?
>
>
> Hi TechNetters;
>
> The Design group I manufacture boards for has asked me if I know what
> the minimum spacing requirements are from board edge to circuit. I
> have looked through IPC-2221 and can't seem to identify anything.
>
> Can anyone steer me in the right direction?
>
> Thanks all; ---------------------------------------------------
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> -----------------------------------------------------
>
> Rob

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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 847-509-9700 ext.5315
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