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]
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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
>
>
>
>
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