I think it would be reasonable to expect that a product marked 100-240 Vac and as compliant with 62368-1 would have been tested, where specified in the standard to test to the "most unfavorable supply voltage," to values in the 90-264 range. If in doubt, you could ask the manufacturer.
Mike Sherman Sherman PSC LLC > On 05/09/2023 10:57 AM CDT Agar, Philip (Leonardo, UK) > <0000220ac8787b71-dmarc-requ...@listserv.ieee.org> wrote: > > > Thank you Bernd, Mike and everyone else who replied with your helpful > comments. > > I think my dilemma concerns the interpretation of the rated voltage tolerance > in relation to the consideration of supply voltage for testing under clause > B.2.3 in IEC62368-1. The clause looks unchanged since 2014 (if not before) > and reads: > > <snip> > In determining the most unfavourable supply voltage for a test, the following > variables shall be taken into account: > – multiple rated voltages; > – extremes of rated voltage ranges; and > – tolerance on rated voltage as declared by the manufacturer. > Unless the manufacturer declares a wider tolerance, the minimum tolerance > shall be taken as +10 % and −10 % for AC mains and +20 % and −15 % for DC > mains. Equipment intended by the manufacturer to be restricted to connection > to a conditioned power supply system (for example, a UPS) may be provided > with a narrower tolerance if the equipment is also provided with instructions > specifying such restriction. > <snip> > > The equipment under consideration is rated 100 to 240 Vac. This range could > be seen as having a significantly wider tolerance than +10 % and −10 % > depending upon what AC mains voltage you had in mind, and therefore not be > subject to any further extension of tolerance according to the above rules, > i.e. it would only be assessed over the voltage range 100 to 240 Vac. > However, if the conventional interpretation is to apply a minimum of +10 % > and −10 % to any stated voltage then the assessment would be performed over > the voltage range 90 to 264 Vac. The latter seems a safer way to go but I > don't know that I could assume it was tested that way and therefore not > necessarily suitable for use on UK mains with its maximum toleranced voltage > of 253 V. > > Regards, > Phil > > -----Original Message----- > From: Dürrer Bernd <bernd.duer...@wilo.com> > Sent: 08 May 2023 09:21 > To: EMC-PSTC@LISTSERV.IEEE.ORG > Subject: [PSES] AW: [PSES] Rated Mains Operating Voltage Regional > Compatibility [General Use] > > *** WARNING *** > > This message has originated outside your organisation, > either from an external partner or the Global Internet. > Keep this in mind if you answer this message. > > > Hi Phil, > > The concept of rated voltage in standards already includes allowable > tolerances and adequate tests. For the supply side, EN 50160 "Voltage > characteristics of electricity supplied by public electricity networks" > requires in clause 4.2.2 that variations of the rated supply voltage should > not exceed ±10 % (with exceptions for remote grid users, e.g. on islands, > where +10 % / -15 % are allowable). As Mike already explained, product safety > standards require testing with the most unfavourable voltage within the > tolerance band of the rated voltage of the equipment (cf. clause B.2.3 in IEC > 62368-1:2018). It is the responsibility of the installer and user that the > equipment is connected to a supply that matches the voltage rating declared > by the manufacturer. > > Kind regards, > > Bernd > > -----Ursprüngliche Nachricht----- > Von: MIKE SHERMAN <msherma...@comcast.net> > Gesendet: Samstag, 6. Mai 2023 20:38 > An: EMC-PSTC@LISTSERV.IEEE.ORG > Betreff: Re: [PSES] Rated Mains Operating Voltage Regional Compatibility > [General Use] > > [EXTERNAL E-MAIL] This email originated from outside of the organization. Do > not click links or open attachments unless you recognize the sender. > > Phil -- > > It is typical for many standards to run voltage sensitive tests (temperature > rise, for example, as I recall) at the labeled voltage PLUS a percentage (6 > to 10 %, as I recall). That percentage is intended to cover the utility > supply tolerances. > > So a product labeled 100-240 Vac will often face a test at 264 Vac. > > Occasionally one might find a product labeled 85-264, but in my opinion that > is most likely a mistake, because it would need to be tested at 290 Vac for a > standard that requires a 10% overvoltage test, and I am not aware of any > supply tolerances that would allow 290 Vac. > > Word to the wise: Australia's nominal voltage is now 230 Vac, but it has > legacy systems that still supply at 240 Vac. So a typical national difference > for Australia is to perform your tests AS IF the rated voltage was 240 Vac. > This means an extra test or two if you're taking a product rated for 230 Vac > for the EU market and want to sell it in Australia. > > Mike Sherman > Sherman PSC LLC > > > On 05/06/2023 4:09 AM CDT Agar, Philip (Leonardo, UK) > > <0000220ac8787b71-dmarc-requ...@listserv.ieee.org> wrote: > > > > > > Please could someone advise me on what standard, if any, might compel a > > manufacturer to rate the operating voltage of their equipment to at least > > cover the utility supply tolerance of the region in which it is being sold? > > For example, a DoC for an IT item sold in the UK claims conformance with > > the requirements of LVD Directive 2014/35/EU and EN62368-1:2014+A11:2017 > > but it is not clear to me that the specified voltage rating of 100 - 240 > > Vac necessarily covers UK utility supply tolerance of up to 253 Vac, or > > even in much of the EU at 243.8 Vac. > > > > Thanks, > > Phil Agar > > EMC Compliance > > > > > > > > > > - > > ---------------------------------------------------------------- > > This message is from the IEEE Product Safety Engineering Society > > emc-pstc discussion list. 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