Hello Moshe, this is what you need to ask yourself, and your answer will be different depending on your market:
Does your power supply output comply with the limits for a TNV circuit? In the US it would not (it is above 60VDC). Therefor, as anything above 60VDC is a hazardous voltage you may need a Y1 capacitor. For Europe, the TNV limits are 120VDC. Therefor, if your power supply is double insulated, your output may qualify to be TNV in Europe. Then you could use a Y2 capacitor to isolate your 60VDC (max 72VDC) power supply from low voltage or ground. Make sure that you use the correct working voltage capacitor. If your power supply is not double insulated, you need to use mains voltage as your working voltage. Hope this helps. Not sure about your second question. Mel Pedersen Midcom, Inc. Homologations Engineer Phone: (605) 882-8535 [email protected] Fax: (605) 882-8633 Just my $0.02, so thats all you can sue me for. ---------- From: [email protected][SMTP:[email protected]] Sent: Wednesday, August 12, 1998 9:01 PM To: [email protected] Subject: FW: Y capacitors on 60VDC supply Hello everyone, I need to put capacitors to gnd on the 60VDC nominal (could go up to 74V) supply inputs of a box located inside a CO. I assume, since the 60V is to be isolated from the low voltage and ground, and since it is a "mains" input, I need Y capacitors. My questions: 1. Does these need to be Y1,Y2..or Y4 caps? (i.e. do I need reinforced insulation?) 2. The caps are needed for suppressing 1000V 1 microusec rise time pulses. On the other hand, their data sheet claims just 200V per microsec. Are they worth using? regards, Moshe -------------------------------------------- Name: moshe valdman E-mail: [email protected] Phone: 972-52-941200 Telefax: 972-3-5496369 List-Post: [email protected] Date: 12/8/98 Time: 18:52:45 You are most welcome to visit my homepage at: http://www.geocities.com/CapeCanaveral/5233/ --------------------------------------------
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