Hi Tom - Absolutely, the requirement is "... it complies with this Directive when properly installed, maintained and used for its intended purpose." But what is "it"?
I maintain that "it" is the product that is tested and sold, not all the possible final configurations in which combinations of "it" might be found. The final installer/user, not the manufacturer, would be responsible for whatever interference might be caused by the in-use combination of multiple units of compliant products UNLESS the manufacturer sells that combination as a product. As an analogy, consider acoustics. There are regulations and standards for testing allowable sound levels. A single product may easily test under the limit, but if multiple products are installed in a small room, the noise could be much louder and even exceed permissible levels. The manufacturer would not be responsible UNLESS that installation was required or recommended by the manufacturer. Best regards, John McBain On Sat, Feb 18, 2023 at 2:13 AM T.Sato <vef00...@nifty.com> wrote: > On Fri, 17 Feb 2023 21:12:40 -0800, > John Mcbain <johnmcb...@ieee.org> wrote: > > > The key is testing the <product>. If all the light bulbs in your house > and > > the connecting wiring was sold as a single product, then presumably it > > would have been tested for EMC in that configuration. I doubt that is > what > > happened. 😆 > > Well, standards usually require to test product, in a representative > or minimum configuration. > > However, in case of the EMC Directive, it requires "... it complies > with this Directive when properly installed, maintained and used for > its intended purpose." > > If if is considered that to install tens of LED lights in a house is > covered by the "intended purpose", shouldn't the LED lights still > comply with the essential requirements of the Directive in that > configuration, too? > > Regards, > Tom > > > > On Fri, Feb 17, 2023 at 6:56 PM Ken Javor <ken.ja...@emccompliance.com> > > wrote: > > > >> I’m finding this an extremely interesting discussion. I don’t have > >> anything definitive to offer, but I do have a question to help stir the > pot. > >> > >> If the possibility that multiple items might be used together and that > >> emissions will be additive in some fashion is a justification for > testing > >> multiple units at a time, what about ... light bulbs? > >> > >> Meaning CFLs or LEDs. > >> > >> My house is full of them. It is reasonable to assume that most > >> homes/businesses are. Perhaps the emissions limits for these were based > on > >> this reasonably foreseeable outcome? > >> > >> Ken Javor > >> Phone: (256) 650-5261 > >> > >> > >> ------------------------------ > >> *From: *John Mcbain <johnmcb...@ieee.org> > >> *Reply-To: *John Mcbain <johnmcb...@ieee.org> > >> *Date: *Fri, 17 Feb 2023 14:22:44 -0800 > >> *To: *<EMC-PSTC@LISTSERV.IEEE.ORG> > >> *Subject: *Re: [PSES] Adding more than one EUT > >> > >> Hi Derek - > >> > >> Typical requirement for a unit that may be sold and used in multiples > >> (that is, all the units can be sold together as one product) is you can > >> test just one IF adding the other units does not increase the emissions. > >> > >> Of course the most practical way to determine that is to assemble the > >> multiple units to see what happens. If the test result for testing max. > >> connected units compared to testing only one unit shows no significant > >> difference, then you're good - but definitely archive those test > results! > >> > >> If you can't pass the test with all units connected, then whatever you > do, > >> don't let Marketing create a multiple-unit product to sell. ;-) > >> > >> Similarly, the desktop PC system that James mentioned would have all > power > >> cords separately tested for conducted emissions as a fully connected > system > >> (monitor, printer, scanner, etc. attached) if it is a product sold as a > >> complete all-included system. > >> > >> Best regards, > >> John McBain > >> > >> > >> On Fri, Feb 17, 2023 at 1:59 PM James Pawson (U3C) < > >> ja...@unit3compliance.co.uk> wrote: > >> > >> > >> Hi Derek, > >> > >> > >> Is the daisy chain connection the AC supply or some other power bus? > >> > >> > >> How is 8 units daisy chained any different to 8 separate units all on > the > >> same power bus? We are looking for individual emission contributions > from > >> each connected unit. > >> > >> > >> If measuring conducted emissions on a desktop pc (y'know, the big ones > we > >> had before everyone had laptops to work from home...) the you would just > >> measure the PC, not the monitor and printer and scanner and modem and > and > >> and... > >> > >> > >> Just thinking aloud > >> > >> All the best > >> > >> James > >> > >> > >> ---- Lfresearch wrote ---- > >> > >> Hi folks, > >> > >> > >> > >> I’ve been asked to test a light fixture that has the ability to be daisy > >> chained up to 8 units. > >> > >> > >> > >> When I run conducted emissions, I’m wondering if I need to insist on > >> having 8 units plugged in at once i.e. fully populated, OR, can I just > test > >> one fixture at a time since that’s how the system is likely to be used > >> also.. > >> > >> > >> > >> Is there a legal requirement or precedent on how this should be tested > as > >> I’m going round in circles arguing with myself here. > >> > >> > >> > >> Thanks, > >> > >> > >> > >> Derek. > >> > >> > >> > >> SSCLabs, > >> > >> Reno, NV. > >> > >> - > >> > >> ---------------------------------------------------------------- > >> > >> This message is from the IEEE Product Safety Engineering Society > emc-pstc > >> discussion list. To post a message to the list, send your e-mail to < > >> emc-p...@ieee.org> > >> > >> > >> > >> All emc-pstc postings are archived and searchable on the web at: > >> > >> http://www.ieee-pses.org/emc-pstc.html > >> > >> > >> > >> Website: http://www.ieee-pses.org/ > >> > >> Instructions: http://www.ieee-pses.org/list.html (including how to > >> unsubscribe) > >> > >> List rules: http://www.ieee-pses.org/listrules.html > >> > >> > >> > >> For help, send mail to the list administrators: > >> > >> Mike Cantwell <mcantw...@ieee.org> > >> > >> > >> > >> For policy questions, send mail to: > >> > >> Jim Bacher: <j.bac...@ieee.org> > >> > >> David Heald: <dhe...@gmail.com> > >> > >> _________________________________________________ > >> > >> To unsubscribe from the EMC-PSTC list, click the following link: > >> https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1 > >> > >> - > >> ---------------------------------------------------------------- > >> > >> This message is from the IEEE Product Safety Engineering Society > emc-pstc > >> discussion list. To post a message to the list, send your e-mail to < > >> emc-p...@ieee.org> > >> > >> All emc-pstc postings are archived and searchable on the web at: > >> http://www.ieee-pses.org/emc-pstc.html > >> > >> Website: http://www.ieee-pses.org/ > >> Instructions: http://www.ieee-pses.org/list.html (including how to > >> unsubscribe) <http://www.ieee-pses.org/list.html> > >> List rules: http://www.ieee-pses.org/listrules.html > >> > >> For help, send mail to the list administrators: > >> Mike Cantwell <mcantw...@ieee.org> > >> > >> For policy questions, send mail to: > >> Jim Bacher <j.bac...@ieee.org> > >> David Heald <dhe...@gmail.com> > >> ------------------------------ > >> > >> To unsubscribe from the EMC-PSTC list, click the following link: > >> https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1 > >> > >> - > >> ---------------------------------------------------------------- > >> > >> This message is from the IEEE Product Safety Engineering Society > emc-pstc > >> discussion list. To post a message to the list, send your e-mail to < > >> emc-p...@ieee.org> > >> > >> All emc-pstc postings are archived and searchable on the web at: > >> http://www.ieee-pses.org/emc-pstc.html > >> > >> Website: http://www.ieee-pses.org/ > >> Instructions: http://www.ieee-pses.org/list.html (including how to > >> unsubscribe) <http://www.ieee-pses.org/list.html> > >> List rules: http://www.ieee-pses.org/listrules.html > >> > >> For help, send mail to the list administrators: > >> Mike Cantwell <mcantw...@ieee.org> > >> > >> For policy questions, send mail to: > >> Jim Bacher <j.bac...@ieee.org> > >> David Heald <dhe...@gmail.com> > >> ------------------------------ > >> > >> To unsubscribe from the EMC-PSTC list, click the following link: > >> https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1 > >> > >> - > >> ---------------------------------------------------------------- > >> > >> This message is from the IEEE Product Safety Engineering Society > emc-pstc > >> discussion list. To post a message to the list, send your e-mail to < > >> emc-p...@ieee.org> > >> > >> All emc-pstc postings are archived and searchable on the web at: > >> http://www.ieee-pses.org/emc-pstc.html > >> > >> Website: http://www.ieee-pses.org/ > >> Instructions: http://www.ieee-pses.org/list.html (including how to > >> unsubscribe) <http://www.ieee-pses.org/list.html> > >> List rules: http://www.ieee-pses.org/listrules.html > >> > >> For help, send mail to the list administrators: > >> Mike Cantwell <mcantw...@ieee.org> > >> > >> For policy questions, send mail to: > >> Jim Bacher <j.bac...@ieee.org> > >> David Heald <dhe...@gmail.com> > >> ------------------------------ > >> > >> To unsubscribe from the EMC-PSTC list, click the following link: > >> https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1 > >> > > > > - > > ---------------------------------------------------------------- > > This message is from the IEEE Product Safety Engineering Society > emc-pstc discussion list. To post a message to the list, send your e-mail > to <emc-p...@ieee.org> > > > > All emc-pstc postings are archived and searchable on the web at: > > http://www.ieee-pses.org/emc-pstc.html > > > > Website: http://www.ieee-pses.org/ > > Instructions: http://www.ieee-pses.org/list.html (including how to > unsubscribe) > > List rules: http://www.ieee-pses.org/listrules.html > > > > For help, send mail to the list administrators: > > Mike Cantwell <mcantw...@ieee.org> > > > > For policy questions, send mail to: > > Jim Bacher: <j.bac...@ieee.org> > > David Heald: <dhe...@gmail.com> > > _________________________________________________ > > To unsubscribe from the EMC-PSTC list, click the following link: > https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1 > > - > ---------------------------------------------------------------- > This message is from the IEEE Product Safety Engineering Society emc-pstc > discussion list. To post a message to the list, send your e-mail to < > emc-p...@ieee.org> > > All emc-pstc postings are archived and searchable on the web at: > http://www.ieee-pses.org/emc-pstc.html > > Website: http://www.ieee-pses.org/ > Instructions: http://www.ieee-pses.org/list.html (including how to > unsubscribe) > List rules: http://www.ieee-pses.org/listrules.html > > For help, send mail to the list administrators: > Mike Cantwell <mcantw...@ieee.org> > > For policy questions, send mail to: > Jim Bacher: <j.bac...@ieee.org> > David Heald: <dhe...@gmail.com> > _________________________________________________ > To unsubscribe from the EMC-PSTC list, click the following link: > https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1 > - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com> _________________________________________________ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
