The pin your refering to is a center tap on the primary winding? As part of the normal fault tree testing each winding will be shorted out one at a time. I don't see a hazard associated with spacings below the numbers in the standard. If this was ITE I'd tell you to only use functional spacing only. However for houshold equipment I would verify that it allows reduction in Non safety spacings by prof testing.
John Merrill [email protected] on 04/03/2001 08:48:34 AM Please respond to [email protected] To: [email protected] cc: (bcc: John Merrill/Aut/Schneider) Subject: IEC60335-1
Hi group A question about clearance and creepage distances indicated in IEC60335-1. The table 13 shows limits of 3mm (creepage) and 2.5mm (clearance) for a working voltage > 130V and < 250V. I still didn't find out if this voltage is RMS or peak value. Anyway, considering a Flyback converter, I know that I will need to comply with these distance limits between primary and secondary circuits. To reduce EMI problems, I can reduce the capacitance of the primary. I can divide the primary in two parts to do this. Doing so, I will need an auxiliary pin in my coil to connect the center tap of the primary. This pin can be cut out later, leaving a short stump with the soldering. My question is: Does the distance between the primary terminals of the transformer, and the center tap of this primary, need to comply with the distances indicated by IEC60335-1? Thanks in advance. Günter J. Maass EMBRACO S.A. ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: [email protected] Dave Heald [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.rcic.com/ click on "Virtual Conference Hall,"
