Hi Jim, 1. I think this is just a matter of preference. For IEC/EN testing, EFT mains coupling requires 33nF capacitors while Surge mains coupling requires 9uF/18uF caps and 0/10 Ohm resistors depending on coupling path (plus 1.5mH decoupling inductors). Some manufacturers put it all in one box and some make separate boxes. Some are manually operated and some operate automatically in conjunction with the transient generator. Some users like the convenience of having everything in one box, and others find it a bottleneck and worry that if one thing breaks, the whole unit has to go back. Once you've verified with the manufacturer that the coupling/decoupling component values are in accordance with the standards, then it's just a matter of cost, reliability, and personal preference. My [biased] personal opinion is that putting it all in one box requires certain compromises on performance, component quality and reliability that we're not willing to make. As they say, your mileage may vary. 2. Yes, you should be able to use Lx-N, Lx-PE and N-PE on a three phase CDN just as you would use L-N, L-PE and N-PE on a single phase CDN. Best Regards, Chris Faust Product Manager - Haefely EMC Christopher M. Faust EMC Product Manager / North American Sales Manager Hipotronics, Inc. - Haefely EMC Division 1650 Route 22 Brewster, NY 10509 Tel: (845) 279-3644 x264 Fax: (845) 279-2467 Email: [email protected] www.haefelyemc.com
>>> Jim Eichner <[email protected]> 12/05/03 06:58PM >>> We are about to make a purchase of surge and EFT test equipment, and I have a couple of questions about coupling-decoupling networks: 1. Why do some test equipment companies sell different CDN's for surge than for EFT, while other companies manage to put out single designs usable for both? 2. Can 3-phase CDN's be used for single-phase equipment, or do we need to 2 CDN's? Thanks in advance for your help. Jim Eichner, P.Eng. Compliance Engineering Manager Xantrex Technology Inc. e-mail: [email protected] web: www.xantrex.com ********************************************************************** This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This footnote also confirms that this email message has been swept for the presence of computer viruses. www.hubbell.com - Hubbell Incorporated **********************************************************************
