John

Assuming your product is commercial in nature, I would suggest you have a 
innerlayer registration requirement. I am aware of several very expensive 
fires (taking out entire facilities) that were caused by poor innerlayer 
registration and voltage surges. After incorporating the so called R coupon 
and enforcing the test the issue was resolved


----- Original Message ----- 
From: "Murphy, John" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, April 07, 2008 1:13 PM
Subject: [TN] layer to layer registration?


Greetings,

                  Is it a good idea to specify layer to layer
registration for Class II

multi-layer PCB's?  My searching thus far indicates it is not directly
contained

in any IPC specification (other than annular ring requirements) but
relegated to

the Master Drawing.


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