Hello James, >From my understanding, it should be functional isolation. Take a look at IEC 60664-2-1, it will probably help you. It has some examples on how to do this.
Em sáb., 22 de mai. de 2021 14:48, James Pawson (U3C) < [email protected]> escreveu: > Hi all, > > > > Currently helping a customer with a 3-phase power monitoring product to > get their electrical safety in order. I understand the requirements for > safety isolation from hazardous live/ES3 to user accessible terminals/ES1 > based on the possible mains transient voltage of up to 2500Vpk (OVC II). > > > > The fundamental question I’m trying to answer is: *are there any > requirements for safety isolation for the AC supply from phase-to-phase or > phase-to-neutral? *My understanding is that the requirements are for > Functional Insulation only between these lines. > > > > Looking at things with my EMC hat on for a moment, we typically conduct > Surge tests to IEC 61000-4-5 at 2kV line-to-earth (see above mains > transient voltage) but also 1kV line-to-line. *Should any functional > insulation requirements be based on the working voltage of the phase(s) or > the potential line-to-line overvoltage condition of 1kV (or more depending > on the environment/OVC)?* > > > > Referring to IEC 60664-1 I can see that (in table F.4), for a 230/400 > 3-phase supply, the line-to-line voltage is rationalized to 400Vac. This > suggests that line-to-line surges are not taken into account. > > > > Are my assumptions correct or am I missing something? > > > > Thanks and all the best > > James > > > > > > > > James Pawson > > > > *Unit 3 Compliance Ltd* > > *EMC : Environmental : Safety : CE + UKCA : Consultancy* > > > > www.unit3compliance.co.uk | +44(0)1274 911747 | +44(0)7811 139957 > > 2 Wellington Business Park, New Lane, Bradford, BD4 8AL > > Registered in England and Wales # 10574298 > > > > > ------------------------------ > [image: AVG logo] <https://www.avg.com/internet-security> > > This email has been checked for viruses by AVG antivirus software. > www.avg.com <https://www.avg.com/internet-security> > > > <#m_-3055382187540902855_m_-2636808322915045395_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> > - > ---------------------------------------------------------------- > > 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 < > [email protected]> > > All emc-pstc postings are archived and searchable on the web at: > http://www.ieee-pses.org/emc-pstc.html > > Attachments are not permitted but the IEEE PSES Online Communities site at > http://product-compliance.oc.ieee.org/ can be used for graphics (in > well-used formats), large files, etc. > > 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: > Scott Douglas <[email protected]> > Mike Cantwell <[email protected]> > > For policy questions, send mail to: > Jim Bacher <[email protected]> > David Heald <[email protected]> > - ---------------------------------------------------------------- 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 <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. 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: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
