Like John, I have no idea why a "medical electrical device" standard has
gotten tangled up with EV chargers. I was one of the authors of the 2nd
edition of the IEC standard, and the only devices under that standard
that weren't patient connected were systems that connected those devices
to outside data recording. Nothing herre seems to apply!
- Brent DeWitt
My opinions have nothing to do with my current employer!
On 7/21/2023 5:10 PM, John Woodgate wrote:
Well, obviously 60601-1-2 doesn't apply, unless some clown claims that
EV chargers are medical devices. The higher limits in 60601-1-2 for
home healthcare are probably due to the expected absence of immediate
intervention when a medical device misbehaves.
======================================================================================
Best wishes John Woodgate OOO-Own Opinions Only
www.woodjohn.uk
Rayleigh, Essex UK
I hear, and I forget. I see, and I remember. I do, and I understand.
Xunzi (340 - 245 BC)
On 2023-07-21 20:30, Scott Aldous wrote:
Hi Brian,
The UL standard actually references IEC 61000-4-3 only for the test
method. Per the UL standard, the test level, 20 V/m, comes from EN
60601-1-2, which is the CENELEC EMC standard for medical devices.
Per this article
<https://www.linkedin.com/pulse/understanding-central-differences-between-3rd-4th-edition-saeed>,
at least the base standard, IEC 60601-1-2, references broad spectrum
testing at 3 V/m for professional healthcare facility environment and
10 V/m for home healthcare environment. Test levels from 9 to 28 V/m
at specific frequencies are referenced to simulate proximity to
fields due to wireless communications. IMO, the UL standard doesn't
make clear if the actual test levels (and frequencies) from EN
60601-1-2 are intended to be used, or just the 20 V/m test level
called out.
On Fri, Jul 21, 2023 at 10:57 AM <[email protected]> wrote:
Hi Brian,
Just for your information, in Europe residential EV chargers (for
charging an EV with AC voltage), typically needs to fulfill the
requirements of EN 61851-21-2 (product standard for off-board EV
chargers). In this standard you will find the applicable test
levels for immunity testing. One of the tests that needs to be
performed is the radiated immunity test according EN 61000-4-3.
(This is the basic standard which specifies how a radiated
immunity test should be performed, in this test standard you find
typical test levels, however in this case the product standard is
where you should look to find the applicable test level.
If the charger will be located solely in a residential
environment, a fieldstrength of 3V/m is applicable. For
locations other than residential 10V/m is required. (modulation
used: 80% AM 1kHz in both cases).
Typically testing is performed in two operational modes:
1) the charger is in charging mode
2) the charger is in waiting mode.
20V/m is more than needed (which is of course allowed, but not
typically done by manufacturers)
FCC (for the US region) does not require immunity testing to be
performed. So in FCC part 15B, you’ll only find emission limits.
So, not related to your question.
I hope it helps.
Greetings,
Bart
*From:*Brian Gregory <[email protected]>
*Sent:* vrijdag 21 juli 2023 18:44
*To:* [email protected]
*Subject:* [PSES] Immunity test field strength, residential setting
Hello colleagues,
We are building EV Chargers for residential markets (not just US)
and one of the safety applicable standards is UL 2231-2. It
calls out IEC 61000-4-3 for immunity testing parameters, which
states a requirement for a field strength of 20V/m. Our EMC
expert says typically testing is "done at 3 Vrms, which is
standard for most products in residential environments." He can
only test up to 10V, and we're hearing the same from an overseas
lab to whom our manufacturer refers.
Does FCC Part B have guidelines for field strength we can cite?
Can some offer this "DC guy" (aka, 60 Hz) a quick definition of
what the 20V/m represents?
I'm guessing 20 V/m is for higher density commercial
applications, aka charging stations, so we probably need an
exception for residential.
Thank you!
Colorado Brian
720-450-4933 <tel:(720)%20450-4933>
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