1. The subject Voltage are r.m.s values: under Item 2, Definitions, the item 2.1 specifies as follows: where the terms voltage and current are used they imply r.m.s. values, unless otherwise specified. 2. In my opinion, YES. In fact you have to provide the required clearance and creepage for insulation in the PRIMARY circuit.
Respectfully yours, Constantin Constantin Bolintineanu P.Eng. DIGITAL SECURITY CONTROLS LTD. 3301 LANGSTAFF Road, L4K 4L2 CONCORD, ONTARIO, CANADA e-mail: [email protected] telephone: 905 760 3000 ext 2568 www.dscgrp.com -----Original Message----- From: [email protected] [mailto:[email protected]] Sent: Tuesday, April 03, 2001 8:49 AM To: [email protected] 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," ------------------------------------------- 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,"
