Hello Kaan: That is correct. For determining CREEPAGE DISTANCE, one does not use the Ringing Voltage. However, to determine the correct CLEARANCE DISTANCE, or Electric Strength test voltage, one must take the Ringing Voltage into account. It seems that you are aware of this, but just thought I would clarify...
Mel Pedersen Midcom, Inc. Homologations Engineer Phone: (605) 882-8535 [email protected] Fax: (605) 882-8633 ---------- From: [email protected][SMTP:[email protected]] Sent: Tuesday, October 13, 1998 11:50 AM To: EMC-PSTC Subject: Re: Crepage/Clearance On Telecom Modem design Hello, Its me again, with another two cents (Hey! maybe this one is worth a nickel... :-). Clause 2.2.7.4 talks about working voltages for determining Creepage Distances with no apparent distinction between Primary and/or Secondary circuits. The clause lists three bullets, with the third bullet indicating that "short-term conditions (e.g. in cadenced ringing signals in TNV Circuits) shall be disregarded". This clause seems to indicate that for Creepage Distance determinations the ringing voltage is not to be considered as part of the Working Voltage. Of course, it could mean something else (these standards can be pretty tricky...), does anyone have a clearification? Kaan L. Gregersen Regulatory Engineer 3Com --------- 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). --------- 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).
