Bill, ED
Yes, For a product to be UL certified it must meet the requirements
of the catagory of product that it is.
In my case that would be UL508 for field wiring for industrial control products or UL840 for clearance and creepage distances on the PCB's.
A Product cannot carry the UL UR or CE marks unless they have been approved by the agency.  UL requires artwork/schems to verify clearance and creepage distances; color coding is preferred.

My comments, not those of the company I work for.

---------------------------
John Laur
Rockwell Automation
Allen-Bradley Co Inc.                 
1201 South Second Street
Milwaukee, WI 53204
+1 414 382 2162 (fax)
+1 414 382 2393 (phone)

[log in to unmask]
---------------------------


> From [log in to unmask] Wed May 28 15:00:46 1997
> Resent-Date: Wed, 28 May 1997 14:57:52 -0500
> Old-Return-Path: <[log in to unmask]>
> From: Ed Cosper <[log in to unmask]>
> To: "'Bill Dieffenbacher'" <[log in to unmask]>
> Cc: "[log in to unmask]" <[log in to unmask]>
> Subject: RE: UL Requirements for Electronic Hardware
> Content-Type: text/plain; charset="us-ascii"
> Resent-From: [log in to unmask]
> 
> Bill,
> 
> As far as I know there are no design limitations per say. However, You must be aware of what materials you stipulate on your drawings. Not all shops have the same materials  UL approved for there shop. The UL approval status is really limited by your board supplier. 
> For example, if you design a part that requires a .004 dielectric and .005 lines, shop A may be approved for those limitations but shop B may not. It all depends an what type of samples each board shop has submitted for approval. Hope this helps.
> 
> Ed Cosper
> Director Quality Assurance and Engineering
> Graphic Electronics
> Tulsa OK 
> 
> ----------
> From:  Bill Dieffenbacher[SMTP:[log in to unmask]]
> Sent:  Wednesday, May 28, 1997 12:57 PM
> To:  [log in to unmask]
> Subject:  UL Requirements for Electronic Hardware
> 
> Does anyone know if there are any design requirements for a product
> to be UL rated?  I thought that materials were rated by UL but that
> they did not delve into design requirements.  Perhaps I'm wrong.
> 
> 
> Bill Dieffenbacher
> Lockheed Martin Control Systems
> 
> 
> 
> 
> 
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