Scott, You may be right with UL1950, but EN60950 tells that the CO battery of 72 volt is a TNV-2 circuit that only needs functional insulation w.r.t. PE. If the CO battery voltage in the US is lower than 60 volt dc, it also requires only functional insulation.
Best regards, Chris On Fri, 06 October 2000, Scott Lemon wrote: > Subject: RE: Suitability of X2 Capacitors as Basic Insulation > Return-Path: <[email protected]> > Content-Type: text/plain; > charset="iso-8859-1" > Content-Length: 4101 > Mime-Version: 1.0 > To: 'Chris Collin' <[email protected]>, [email protected] > X-Received: 6 Oct 2000 21:06:06 GMT > Delivered-To: altavista.com%[email protected] > From: Scott Lemon <[email protected]> > Date: Fri, 6 Oct 2000 14:10:43 -0700 > Cc: [email protected] > Message-Id: <[email protected]> > X-Mailer: Internet Mail Service (5.5.2650.21) > Received: by mail.packetcom.com with Internet Mail Service (5.5.2650.21) > id <SG87V1MD>; Fri, 6 Oct 2000 14:10:52 -0700 > from mail.packetcom.com (63.108.173.140) > by smtp.c012.sfo.cp.net (209.228.13.148) with SMTP; 6 Oct 2000 14:06:06 > -0700 > by mail.packetcom.com with Internet Mail Service (5.5.2650.21) > id <SG87V1MD>; Fri, 6 Oct 2000 14:10:52 -0700 > > Peter indicates that he is using this cap in an application up to 72 Vdc > which is hazardous voltage according to UL 1950. Hazardous voltage must be > separated from earth by at least basic insulation (clause 2.3.3.2). > > Regards, > > Scott Lemon > Caspian Networks - RTP > email: [email protected] > phone: (919) 466-0315 > fax: tbd > > > -----Original Message----- > From: Chris Collin [mailto:[email protected]] > Sent: Thursday, October 05, 2000 3:26 PM > To: [email protected] > Cc: [email protected] > Subject: Re: Suitability of X2 Capacitors as Basic Insulation > > > > Peter, > > I understand you want to use this capacitor between the Central Office > battery and Ground (Protective Earth). > Why do you need Basic Insulation anyway if you interconnect to Protective > Earth. > From my point of view, you only need Operational insulation. > Regards, > Chris Collin > > On Thu, 05 October 2000, Peter Merguerian wrote: > > > Sender: [email protected] > > X-Listname: emc-pstc > > To: <[email protected]> > > Delivered-To: altavista.com%[email protected] > > X-Moderator-Address: [email protected] > > X-Sender: itldom /[email protected] > > X-Resent-To: Multiple Recipients <[email protected]> > > Received: by ruebert.ieee.org (8.9.3/8.9.3)id EAA17721; Thu, 5 Oct 2000 > 04:35:25 -0400 (EDT) > > from ruebert.ieee.org (199.172.136.3) > > by smtp.c012.sfo.cp.net (209.228.13.220) with SMTP; 5 Oct 2000 > 03:44:44 -0700 > > by ruebert.ieee.org (8.9.3/8.9.3) id EAA17721; Thu, 5 Oct 2000 > 04:35:25 -0400 (EDT) > > Content-Type: text/plain; charset="us-ascii" > > Content-Length: 1102 > > X-Received: 5 Oct 2000 10:44:44 GMT > > Precedence: bulk > > Subject: Suitability of X2 Capacitors as Basic Insulation > > X-Info: [Un]Subscribe requests to > > [email protected] > > [Un]Subscribe requests to > > [email protected] > > From: Peter Merguerian <[email protected]> > > Return-Path: <[email protected]> > > Mime-Version: 1.0 > > Reply-To: Peter Merguerian <[email protected]> > > Date: Thu, 05 Oct 2000 11:28:26 +0200 > > Message-Id: <[email protected]> > > X-Mailer: QUALCOMM Windows Eudora Light Version 3.0.6 (32) > > > > > > Is it possible to use a 250 Vac X2 approved capacitor as a y capacitor > > (input to ground) for a unit with an input voltage of 48/60Vdc up to > 72Vdc? > > In other words, is an X2 capacitor suitable for basic insulation? > > Peter Merguerian > > Managing Director > > Product Testing Division > > I.T.L. (Product Testing) Ltd. > > Hacharoshet 26, POB 211 > > Or Yehuda 60251, Israel > > > > Tel: 972-3-5339022 Fax: 972-3-5339019 > > e-mail: [email protected] > > website: http://www.itl.co.il > > > > TO LEARN ABOUT AUSTRALIAN AND NEW ZEALAND REQUIREMENTS, CONTACT ME AT THE > > EARLIEST STAGES OF YOUR DESIGN; REQUIREMENTS CAN BE TRICKY! > > > > > > > > > > > > > > ------------------------------------------- > > 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] > > _______________________________________________________________________ > > Free Unlimited Internet Access! 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