"I see your point, but as I understand it, only if the power pack is made available with the apparatus to the end user, i.e. a system. This is up to the manufacturer to define."
1. Many 24 VAC products are shipped with a separate 230/24VAC transformer unit that plugs into the mains. In this case, Surge testing is performed on the 230 Volt side of the transformer. 2. Occasionally, products with a 24 VAC input are marketed without a transformer. Example: small surveillance cameras. Several of these cameras are often installed in a factory or office, and the 24 VAC is daisy-chained from a single 230/24 VAC transformer. In this situation the EMC Laboratory will often recommend that the camera manufacturer provide a "typical" transformer that might be chosen by the end user. Surge testing is then performed on the 230 Volt side of this "representative" transformer. And of course, the Test Report will clearly state the rationale for this arrangement. Jim Ericson Acme Testing Company ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: [email protected] Dave Heald [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
