Hello All, I am wondering if the 20 V/m level was borrowed from IEEE C37.90.2, which is referenced in UL CCN NRGU for Protective Relays. The IEEE C37.90.x series is one of the industry standards for items associated with protecting and control of the electrical grid. It does not seem quite right but is the only link that seems somewhat associated.
Without being on the working group I can only speculate on reasoning, but I can imagine a conversation that went something like this: Person A - "Considering the power tools, welders, spark plugs, metal lathe, end mill, wireless phones, short-range two-way radios, and other electrical noise generators I have had and used in my garage maybe the radiated immunity levels should be higher than 3 V/m for this end use environment." Person B - "Your right, I remember the time ...." Bill From: James Pawson (U3C) <[email protected]> Sent: Monday, July 24, 2023 1:20 AM To: [email protected] Subject: Re: [PSES] Immunity test field strength, residential setting [Caution - External] Hi Brian, 20V/m is seen in some bands for rail standards, but I've seen it elsewhere, usually where there is a functional safety aspect. Attached table from EN 55035 shows estimates of field strength vs distance from typical transmitters. There is also something in EN 60601-1-2 (clause 8.10 from memory) All the best James James Pawson Managing Director & EMC Problem Solver Unit 3 Compliance Ltd EMC : Environmental & Vibration : Electrical Safety : CE & UKCA : Consultancy www.unit3compliance.co.uk [unit3compliance.co.uk]<https://urldefense.com/v3/__http:/www.unit3compliance.co.uk/__;!!O7uE89YCNVw!J7XR479oYnJAeDyTYKumGnC2Nlrx2_5Ld-ZV-z3fz08ONT_m2oNHK14VyWAFllXaHSk1CiecdAWT7b0P4u1ivsH5$> | [email protected]<mailto:[email protected]> +44(0)1274 911747 | +44(0)7811 139957 2 Wellington Business Park, New Lane, Bradford, BD4 8AL Registered in England and Wales # 10574298 Office hours: Every morning my full attention is on consultancy, testing, and troubleshooting activities for our customers' projects. I'm contactable between 1300h to 1730h from Monday to Friday. For inquiries, bookings, and testing updates please send us an email on [email protected]<mailto:[email protected]> or call 01274 911747. Our lead times for testing and consultancy are typically 4-5 weeks. From: Brian Gregory <[email protected]<mailto:[email protected]>> Sent: Friday, July 21, 2023 5:44 PM To: [email protected]<mailto:[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 ________________________________ This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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