I am reading through IEC 61293:2020 and comparing it to what some of the
Product Standards say and examples on the Web regarding the Voltage Rating
that would go on a Nameplate or Label. I am really struggling with 3 phase
voltage ratings. Industrial machines show this information as a table, but
Hi Brian;
I struggled a bit with this as well. I don't like using "3~400V" because
(even with a space) it could be misinterpreted as "three to 400 volts"
ridiculous as that may be...
For "Three phase with neutral" I did not want to use any (English) text as
our product is shipped worldwide. I se
Hi, Brian. You don't say whether the product is for Europe or the
Americas, or elsewhere. By the voltages, It's Europe, but it's best to
be clear. In principle, the Product Standard is definitive, so what
does it say? I have never seen the PE mentioned in this context, and
it's best to keep th
Here is some preliminary research findings about breaking down the isolation
barrier multiple times of most all power supplies on the AC main from a single
1400 Volt EFT-like pulse. It is dramatic and can lead to system problems by
amplifying ESD and EFT stress on a system and can even lead to l
Hi Brian,
Below is an extract from table F.2 of IEC 62368-1. Maybe it helps.
Best regards,
Bostjan
[cid:image001.png@01DBA99F.83F94FD0]
From: John Woodgate
Sent: Wednesday, April 9, 2025 10:13 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Fwd: Rating Label Nomenclature
CAUTION: This e
Brian —
Good thing to be paying close attention to!
We did something similar to what Ken describes.
I really like the ~ sign, because “AC” is not universally accepted; it’s “CA”
in Spanish, for example. I encouraged its use on single phase products for
international markets.
I seem to rec
Hi Brian,
This is correct:
> On Apr 9, 2025, at 15:55, Brian Kunde wrote:
>
> Single Phase = 230V~
> Three Phase = 400V 3~
You can indicate the wiring requirements like this:
3P+N+PE for 3 poles + Neutral + PE for a TN-S Y system
3P+PE for 3 poles + PE for a TN-S Δ connected system
If you w
230/400V 3~ is nominal voltage for the EU and widely used in low-voltage
distribution, and the USA uses 277/480V common in industrial, and 120/208V for
commercial.
Ralph
From: John Woodgate
Sent: April 9, 2025 1:13 PM
To: EMC-PSTC@LISTSERV.IEEE.ORG
Subject: Re: [PSES] Fwd: Rating Label No
277/480 V in L-N/L-L (phase to neutral / phase to phase). It could be single
phase or three phase.
Best Regards and Be Safe
Bansi Patel
BRP Consultants
IEEE PSES Emeritus (2025-2027)
IEEE PSES, Board of Governors-at Large (2018-2023, 2025-2027)
IEEE PSES San Dirgo Chapter Chair 2020-2025
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