William, That's a good question . . . but this is where the Competent Body (that is actually the correct authority - not Notified Body), comes in. If the 'variation' is developed after the TCF is made for the installation, they would be the ones to determine if any tests need to be performed, or a detailed addendum be added to the TCF.
Choose your CB wisely. Trust is important. John Juhasz Fiber Options Bohemia, NY -----Original Message----- From: William D'Orazio [mailto:[email protected]] Sent: Monday, January 08, 2001 4:55 PM To: emcpost Subject: RE: TCF's John, What if the installation has variants, do the tests have to be repeated, or is it sufficient to compile a new TCF describing the changes. Thanks, William D'Orazio CAE Electronics Ltd. Electrical System Designer Phone: (514) 341-2000 (X4555) Fax: (514)340-5552 Email: [email protected] -----Original Message----- From: John Juhasz [mailto:[email protected]] Sent: Monday, January 08, 2001 1:04 PM To: 'Courtland Thomas'; emcpost Subject: RE: TCF's For the sake of brevity (?) I am going to try and keep it simple . . . For one example a TCF (Technical Contruction File) is useful for a company that has numerous products in a product 'family'/ For instance, there may be a dozen variations based on one design (i.e. printed circuit board partially populated with components for one product, fully populated for another, etc). This may make it difficult (or impossible) to test every single variation. In that case, a manufacturer would take the TCF route to compliance. One set of tests and then a file consisting of documentation describing/detailing all the variations along with engineering considerations for each. That 'package' is reviewed by a Notified Body who basically agrees that, based on the documentation presented, the one set of tests covers the whole product family. The NB affixes their 'stamp of approval'. Another example maybe a product (installation) that is too large to test. In that case certain sub-assemblies or groups of sub-assemblies (the Notified Body will determine) would be tested to all or only some of the tests, and a TCF describing the entire product (installation) would be generated. I was trying to keep this short, so I may have not described it completely (or totally acccurate), but this should give you the idea. John Juhasz Fiber Options Bohemia, NY -----Original Message----- From: Courtland Thomas [ mailto:[email protected] <mailto:[email protected]> ] Sent: Monday, January 08, 2001 1:09 PM To: emcpost Subject: TCF's Hello group, I would like to know the intent of TCF's for CE. There are numerous standards such as Radiated Emissions, Conducted Emissions, ESD, Radiated Immunity, Fast Transients, Surge, etc..., that apply. What actually is the intent of the TCF? Is it to allow the manufacturer to select only certain standards in lieu of testing to all the standards? Courtland Thomas Patton Electronics ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: [email protected] Michael Garretson: [email protected] For policy questions, send mail to: Richard Nute: [email protected] ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: [email protected] Michael Garretson: [email protected] For policy questions, send mail to: Richard Nute: [email protected]
