Doug, I agree with John on this - I don't think you could reasonably exclude the heating loads, since there will be some EM effects created during the switching. The rest of the test plan looks reasonable to me.
-- Doug Nix, A.Sc.T. IEEE PSES Toronto Section, Ontario, Canada d...@ieee.org mobile (519) 729-5704 fax (519) 653-1318 Find me LinkedIn at http://www.linkedin.com/in/dougnix On Mar 20, 2009, at 19:44, John Woodgate wrote: > In message <79b6babf7ce2914591e1c45c7ed086fa199...@chiefwiggum.nceelabs.org > >, dated Fri, 20 Mar 2009, Doug Kramer <dkra...@nceelabs.com> writes: > >> The question, which EMC standard applies? >> >> >> >> 55014 excludes from its scope ?regulating controls and equipment >> with regulating controls incorporating semiconductor >> >> devices with a rated input current of more than 25 A per phase?. >> Would this constitute a regulating control? > > The exclusion is ambiguous: is it the equipment that is rated at > over 25 A/phase or the semiconductors? If equipment was meant, there > should be commas after 'controls' and 'devices'. > > You say the heater is switched by a contactor, not a semiconductor > device, so CISPR14-1/EN55014-1 and CISPR 14-2/EN 55014-2 would > appear to apply. >> >> >> >> 61000-3-2 and 61000-3-3 are for devices under 16A, which the >> controller most definitely is such a device, but the complete >> product is not. >> >> >> >> My best judgment is the following: >> >> >> >> EN61000-6-1, Immunity tests called out therein: >> >> 61000-4-2, ESD >> >> 61000-4-3, Radiated RF fields >> >> 61000-4-4, electrical fast transients >> >> 61000-4-5, surge >> >> 61000-4-6, conducted RF signals >> >> 61000-4-11, voltage dips and interrupts (which doesn?t apply for >> devices over 16A, see above regarding 61000-3-2) > >> >> EN61000-6-3, Emissions tests called out therein: >> >> 61000-3-11, Limitation of voltage changes, voltage fluctuations and >> flicker in public low-voltage supply systems - Equipment with rated >> current 75 A and subject to conditional connection >> >> 61000-3-12, Limits for harmonic currents produced by equipment >> connected to public low-voltage systems with input current > 16 A >> and 75 A per phase > > Yes, you could go down that route. With a 42 A single-phase current, > you are going to have to specify a REALLY low supply impedance in > order to meet 61000-3-11 and -12. >> >> CISPR 16-2-3, radiated emissions (30MHz-1GHz) >> >> CISPR 16-2-1, conducted emissions (150kHz-30MHz) >> > No, these are Basic standards that only define methods of > measurement; they do not include limits, so you may USE them in > testing but you do not really 'apply' them. >> >> >> That seems rationale to me, but I was still asked the question: >> >> Would it be appropriate to test the device with the heater >> disconnected and treat it as a product only drawing 1A? > > No, I don't think you would get away with that. > -- > OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk > Things can always get better. But that's not the only option. > John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK > > - > ---------------------------------------------------------------- > 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.ieeecommunities.org/emc-pstc > Graphics (in well-used formats), large files, etc. can be posted to > that URL. > > Website: http://www.ieee-pses.org/ > Instructions: http://listserv.ieee.org/request/user-guide.html > List rules: http://www.ieee-pses.org/listrules.html > > For help, send mail to the list administrators: > Scott Douglas <emcp...@ptcnh.net> > Mike Cantwell <mcantw...@ieee.org> > > For policy questions, send mail to: > Jim Bacher: <j.bac...@ieee.org> > David Heald: <dhe...@gmail.com> - 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.ieeecommunities.org/emc-pstc Graphics (in well-used formats), large files, etc. can be posted to that URL. Website: http://www.ieee-pses.org/ Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <emcp...@ptcnh.net> Mike Cantwell <mcantw...@ieee.org> For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> David Heald: <dhe...@gmail.com>
