Dear Members:
A tech note, "Voltage and Agency Markings on Agency Approved RFI Capacitors", >from EVOX RIFA ( <http://www.evoxrifa.com/technote_pdf/rfi_cap_voltage.pdf> http://www.evoxrifa.com/technote_pdf/rfi_cap_voltage.pdf) states: "...In Europe most RFI capacitor applications require that the capacitor be approved according to EN132400 (IEC384-14) at the nominal line voltage. Accordingly various capacitors have various rated voltages for Europe. ... In North America nearly all applications involving voltages above 250VAC have no agency requirements on the capacitors themselves. In fact there is no UL or CSA approval that is valid for these applications. When one submits a capacitor for UL1414 or CSA C22.2 No.1 approval (applicable only to TV, radio and certain telecom applications) one has only two choices for voltage: 125 or 250VAC. There are no other options." The scope of UL 1414 (titled: UL Standard for Safety for Capacitors and Suppressors for Radio- and Television-Type Appliances) states ( <http://ulstandardsinfonet.ul.com/scopes/1414.html> http://ulstandardsinfonet.ul.com/scopes/1414.html): "... These requirements cover capacitors rated not more than 1.0 microfarad, 85°C, 250 V, and 60 Hz that are employed in radio, television receiving, and similar appliance circuits where breakdown of the capacitor results in a risk of fire, electric shock, or injury to persons. ..." The scope of the IEC 60384-14 - Ed. 3.0 (Fixed capacitors for use in electronic equipment - Part 14: Sectional specification: Fixed capacitors for electromagnetic interference suppression and connection to the supply mains) states ( <http://domino.iec.ch/webstore/webstore.nsf/artnum/034448> http://domino.iec.ch/webstore/webstore.nsf/artnum/034448): "This part of IEC 60384 applies to capacitors and resistor-capacitor combinations which will be connected to an a.c. mains or other supply with nominal voltage not exceeding 1 000 V a.c. (r.m.s.) or 1 000 V d.c. and with a nominal frequency not exceeding 100 Hz." My questions are: 1. Does this mean, in the US, for capacitors rated above 250VAC, a capacitor manufacturer doesn't need to worry about regulatory requirement/approval? 2. Is there any other UL standards covering capacitors for ITE, audio/video, lighting equipment, such as IEC 60384-14 which covering higher voltage rating? 3. How does a product manufacturer determine capacitor ratings? Does it base on the product standard? For a 277V/480V dimmer module ( <http://www.crestron.com/produ ts/show_products.asp?type=commercial&cat=14&subcat=1007&id=1077> http://www.crestron.com/products/show_p oducts.asp?type=commercial&cat=14&subcat=1007&id=1077), how to determine capacitor ratings? Thank you very much for your time and look forward to your help. Best regards, Grace Lin Sr. Compliance Engineer Crestron Electronics, Inc. New Jersey, USA <http://www.crestron.com/> www.crestron.com - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
