I would agree with your argument that you need not comply because you are not connected to the public low voltage supply. Furthermore, the standards you cite are written for 230V, 50Hz distribution, so your voltage is not even within the scope of the standard. John P. Wagner Regulatory Compliance & Mandatory Standards AVAYA Strategic Standards. 1300 W. 120th Ave, Room B3-D16 Westminster, CO 80234-2726 Phone/Fax: (303) 538-4241 [email protected]
> ---------- > From: Scott Douglas[SMTP:[email protected]] > Reply To: Scott Douglas > Sent: Tuesday, October 22, 2002 5:02 AM > To: [email protected] > Subject: Do I need to Test for Harmonics? > > Fellow Listees: > > There were some recent threads regarding what testing is required for a > product that obtains power from a supply external to the product and maybe > not supplied by the manufacturer. I think the questions were related to EFT > or surge. > > I have a similar situation. Our products are network powered; that is, there > is a ferroresonant power supply connected to the network and we just tap into > that available power. This is CATV land and not Telco. We do not make the > supply nor do we sell them. Our products have switching supplies which run on > the quasi-square wave provided by the ferroresonant supply. Voltage of the > supply is in the 60-90 VAC range. > > Question is: EN 50083-2 : 2001 (4.1.2 Disturbance Voltages From Equipment...) > says that if our products fall within the input current range of EN > 61000-3-2, then the tests and limits of that standard apply. Then EN > 61000-3-2 : 2000 (1. Scope) says that the standard applies to products > intended to be connected to public low-voltage distribution systems. > > One argument says that we are not connected to the public low-voltage > distribution system, instead the ferroresonant supply is. Therefore, since we > ARE NOT "connected" we do not need to do the harmonics test. The flip side > argument says that we still have to test harmonics because the supply does > nothing but provide power to our product and therefore we ARE "connected". > > Understand that this "system" consists of power supplies and amplifiers, etc. > from one or more than one supplier (read that more than one manufacturer). We > cannot guarantee we are the sole provider here, in fact will most likely not > be the sole provider. Especially since we do not manufacture or sell power > supplies. > > So all powerful and wise list, what's a mother to do? Do I, or do I not, > test? Am I required to test? Have I missed something? > > Thanks for all of the wisdom you are about to impart. > > Regards, > Scott Douglas > Senior Compliance Engineer > Narad Networks > 515 Groton Road > Westford, MA 01886 > phone: 978 589-1869 > [email protected] > > www.naradnetworks.com <http://www.naradnetworks.com/> > ------------------------------------------- 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: Ron > Pickard: [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://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc > mailing list" >
