Section 3 General Requirements - . . . . designed in accordance with the
specifications listed  . . .
The standards listed are the IPC 2220 Series of Design Standards. It is
possible for the minimum electrical clearance to be greater than the
IPC-2221 table. It might be directly defined in a drawing or in a safety
standard specified on a drawing or procurement document. UL, NEC, and CSA
standards, on occasion, establish minimum electrical clearances.


-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Bruce D Stilmack
Sent: Tuesday, January 04, 2005 6:19 AM
To: [log in to unmask]
Subject: [TN] Minimum Electrical clearance


I know this has been discussed at length in the past, but I can not find an
answer to this question in the archives.  I am hoping one of you ( or maybe
even Jack) can answer this.  J-STD-001 talks at length about not violating
minimum electrical clearance.  I know that IPC-2221A has requirements for
both the PWB and the assembly with regards to minimum electrical clearance.
However, how does one make the connection between the two?  There is no
direct reference that I can find that pushes you to 2221 to look for this
information.  Also, and this is for Jack or those that were involved with
creating these specs, why are the assembly requirements located in the PWB
design spec?

Bruce Stilmack
GDLS-TO Manufacturing Engineer
(850) 574-4773
[log in to unmask]

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