Reply to: RE>>UL 1950/CSA 22.2 No. 950 Art and Egon, In general, the recognized or certified components program is set up to facilitate component and material manufacturers in selling their products to user or manufacturers. If you selected a right and applicable recognized/certified component or material for using in your assembly or product assembly, it will help to simplify the investigation/certification for that product. If you, as a manufacturer who has the ability to design and build your products (including the P.S.) from the raw material and component level ( because you could not find the right component or material for your specific product), you have the following benefits and disadvantages:
Benefits - 1) You have the complete control of your final product manufacturing process. 2) You do not have to pay for other people overhead cost. 3) You do not encount unexpected changes or out-of-business or MD from suppliers and vendors. 4) You have the control of the planning and expansion or enhancement of the product. 5) It will cost you less because less unexpected occurences after production. Disadvantages: 1) Investigation and testing will take longer. 2) It will cost more at the beginning. 3) It could take a longer factory inspection. So, You have to weight the benefits and disadvages before you make your decision. Others may have some different opinions. As usual, opinion is my own ............ Best regards, Bao Tran, P.E. Nortel/NTI Richardson, Texas Bao.Tran. [email protected] -------------------------------------- List-Post: [email protected] Date: 10/3/96 8:15 AM To: Bao Tran From: Egon H. Varju ----- E X T E R N A L L Y O R I G I N A T E D M E S S A G E ----- The way most safety agencies look at this is that if all the materials used meet or exceed Class B requirements, then the transformer is Class B. BTW UL1950/CSA950 requires components to meet the requirements of UL _and_ CSA (not _or_!). But nowhere in the standard does it say that any or all components must be UL and/or CSA certified. Any uncertified component may be used, as long as it is tested and/or examined to ensure compliance with the applicable standards. If you have a recognized insulation system, then this makes life easier; otherwise, surely the agency engineer should be capable of examining the materials used to ensure compliance. Just my personal opinion .... Egon Varju ------------------ RFC822 Header Follows ------------------ Received: by nrchq1.rich1.nt.com with SMTP;3 Oct 1996 08:15:03 U Received: from ruebert.ieee.org by corpgate.nt.com with SMTP (PP); Thu, 3 Oct 1996 13:11:02 +0000 Received: (from daemon@localhost) by ruebert.ieee.org (8.7.5/8.7.3) id HAA13656 for emc-pstc-list; Thu, 3 Oct 1996 07:49:17 -0400 (EDT) List-Post: [email protected] Date: 30 Sep 96 19:01:47 EDT From: "Egon H. Varju" <[email protected]> To: Art Michael <[email protected]> Cc: IEEE <[email protected]> Subject: Re: UL 1950/CSA 22.2 No. 950 Message-ID: <[email protected]> Sender: [email protected] Precedence: bulk Reply-To: "Egon H. Varju" <[email protected]> X-Resent-To: Multiple Recipients <[email protected]> X-Listname: emc-pstc X-List-Description: Product Safety Tech. Committee, EMC Society X-Info: Help requests to [email protected] X-Info: [Un]Subscribe requests to [email protected] X-Moderator-Address: [email protected]
