>From UL60950-1: 1.5.6 Capacitors in primary circuits A capacitor connected between two line conductors of the PRIMARY CIRCUIT, or between one line conductor and the neutral conductor, shall comply with IEC 60384-14:1993, subclass X1 or X2. The duration of the damp heat, steady state test as specified in 4.12 of IEC 60384-14:1993, shall be 21 days. A capacitor connected between the PRIMARY CIRCUIT and protective earth shall comply with IEC 60384-14:1993, subclass Y1, Y2 or Y4, as applicable.
1.5.7.2 Bridging capacitors It is permitted to bridge DOUBLE INSULATION or REINFORCED INSULATION by: – a single capacitor complying with IEC 60384-14:1993, subclass Y1; or – a single capacitor complying with IEC 60384-14:1993, subclass Y2, where the equipment RATED VOLTAGE is less than 150 V with respect to neutral or earth; or – two capacitors in series, each complying with IEC 60384-14:1993, subclass Y2 or Y4. A Y1 capacitor, or a Y2 capacitor used in accordance with the above second dash, is considered to have REINFORCED INSULATION. Where two capacitors are used in series, they shall each be rated for the total WORKING VOLTAGE across the pair and shall have the same nominal capacitance value. luck, Brian From: [email protected] [mailto:[email protected]]On Behalf Of Grace Lin Sent: Friday, November 03, 2006 10:50 AM To: [email protected] Subject: Regulatory Requierments for Capacitors in Power Supplies 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) states: ....... 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/products/show_products.asp?type=commercial&cat=14&su bcat=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 - 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 ______________________________________________________________________
