Hello Moshe: It seems to me that your customer is too worried. I am assuming that you have your board layout designed for BASIC INSULATION between points the Telecommunications Network connection and points b) and c) of clause 6.4.2.2 of IEC 950. This is the requirement, and it will withstand a 1.0kV HY-POT. You should have 1.6mm of creepage and clearance between the network traces and the SELV traces. Points b) and c) should be SELV. With 1.6mm, you should be fine, as the breakdown for air is on the order of 3.0kV/mm.
Assuming that you are talking about the ADSL line you refereed to earlier, another clause of IEC 950 may require a HY-POT test on the order of 1150V; Australia will require 1.5kV between the Network connection and points b) and c). Your board should pass at 1.5kV also. Norway and Sweden may require SUPPLEMENTARY INSULATION here rated for 250VDC between any circuit connected to Earth Ground and the Network, which is 2.5mm of spacing. That would also require a 1.5kV HY-POT test. If the above is not true, I will question my sanity. I do not think that you have anything to worry about. Make sure that your spacings are correct, and that you meet requirements for any components (transformers, capacitors, etc.) that might be bridging this barrier. Then you should be fine. Mel Pedersen Midcom, Inc. Homologations Engineer Phone: (605) 882-8535 mpeder...@midcom-inc.com Fax: (605) 882-8633 ---------- From: mvald...@netvision.net.il[SMTP:mvald...@netvision.net.il] Sent: Thursday, August 06, 1998 2:10 AM To: emc-p...@ieee.org Subject: 150VDC basic insulation versus 1000VAC test Hello everyone, My customer is having doubts about how a product designed for 150V pollution deg 2, CTI group 3, shall withstand the 1000V test (950 clause 6.4.2.2) It seems to me OK since the test is done for just one minute and very carefully. (And in a benign environment) Am I right to feel at ease about this? Should I add more separation between conductors (or other means) to make sure the product passes? regards, Moshe -------------------------------------------- Name: moshe valdman E-mail: mvald...@netvision.net.il Phone: 972-52-941200 Telefax: 972-3-5496369 List-Post: emc-pstc@listserv.ieee.org Date: 6/8/98 Time: 0:10:05 You are most welcome to visit my homepage at: http://www.geocities.com/CapeCanaveral/5233/ -------------------------------------------- --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.com with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, ri...@sdd.hp.com, or roger.volgst...@compaq.co (the list administrators).
