Last I heard the third edition was due out during the first half of this year. A draft is currently in review with the CSA Subcommittee on CSA C22.2 No. 950 and the UL 1950 IAC.
Rick Cooper Sr. Project Engineer MET Laboratories, Inc. 410-354-3323 Ext. 331 http://www.metlabs.com/ <http://www.metlabs.com/> -----Original Message----- From: Ned Devine [SMTP:[email protected]] Sent: Friday, January 14, 2000 15:22 To: [email protected] Subject: RE: Capacitors to Ground Hi, I was quoting from the new edition, 3rd, of IEC 60950. But, it does bring up the question of when the EN, UL/CSA versions will be issued. Anyone have the proposed dates? Ned Devine Entela, Inc. Program Manager III Phone 616 248 9671 Fax 616 574 9752 e-mail [email protected] -----Original Message----- From: barry marks [mailto:[email protected]] Sent: Friday, January 14, 2000 2:20 PM To: 'Ned Devine'; [email protected] Subject: RE: Capacitors to Ground Ned, Interesting, my copy of EN60950 (covers through A4) doesn't have the part about the "y" caps, it only addresses "X" cap applications in 1.5.6. "Y" capacitors are referenced in 1.6.4, but that clause is specifically for IT power systems, which our equipment will not function on. What version of EN60950 did you quote that from? Thanks, Barry Marks -----Original Message----- From: [email protected] [mailto:[email protected]]On Behalf Of Ned Devine Sent: Friday, January 14, 2000 9:49 AM To: [email protected] Subject: RE: Capacitors to Ground Hi, You might be in trouble, Clause 1.5.6 of IEC 60950, 3rd edition requires Y. See Clause below. Ned Devine Entela, Inc. Program Manager III Phone 616 248 9671 Fax 616 574 9752 e-mail [email protected] 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 of IEC 60384-14:1993, subclass Y1, Y2 or Y4, as applicable. NOTE - The above requirement does not apply to capacitors connected from a HAZARDOUS VOLTAGE SECONDARY CIRCUIT to earth. For such capacitors, the electric strength test of 5.2.2 is considered sufficient. Compliance is checked by inspection. -----Original Message----- From: BarryM [mailto:[email protected]] Sent: Thursday, January 13, 2000 2:03 PM To: [email protected] Subject: Capactitors to Ground Hello all, I'm looking for any standards / decisions / interpretations, etc... that discuss the use of capacitors to ground in industrial, fixed, permanently connected equipment. We have a 3 phase, 400V product that requires a significant amount of capacitance to ground, and the use of available "Y" rated capacitors is burdensome in that it would take a lot of them. We're aware of leakage current issues, and are well within the 5% allowance (EN50091-1-1, which references EN60950 for most core requirements). We are using about 1.3-2uf from each phase to ground. UL and CSA both do not require "y" type capacitors in this class of product, I'm hoping there is a similar rationale in Europe. Thank you in advance for any comments you may have, Barry Marks --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
