FCC Part B has nothing to do with immunity. It protects radio receivers. 20 V/m simply means they are taking into account higher power or closer rf transmitters. Your cell phone, transmitting at 0.5 W, theoretically can generate 5 V/m a meter away. That will scale up in closer, although the scale factor breaks down for very close separations.
Since the typical limits are 1, 3, and 10 V/m, It may be difficult to find someone who can do this. One (long shot) hope is if they define the peak of the modulation as 20 V/m, instead of as 36 V/m, then a facility that can do 10 V/m (peak of the modulation envelope being 18 V/m per 61000-4-3) may be able to do 20 V/m, peak as well. -- Ken Javor (256) 650-5261 From: Brian Gregory <brian_greg...@netzero.net> Reply-To: Brian Gregory <brian_greg...@netzero.net> Date: Friday, July 21, 2023 at 11:44 AM To: <EMC-PSTC@LISTSERV.IEEE.ORG> 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. To post a message to the list, send your e-mail to All emc-pstc postings are archived and searchable on the web at: https://www.mail-archive.com/emc-pstc@listserv.ieee.org/ Website: https://ewh.ieee.org/soc/pses/ Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to unsubscribe) List rules: https://ewh.ieee.org/soc/pses/listrules.html For help, send mail to the list administrators: Mike Sherman at: msherma...@comcast.net Rick Linford at: linf...@ieee.org For policy questions, send mail to: Jim Bacher at: j.bac...@ieee.org To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1 - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <emc-p...@ieee.org> All emc-pstc postings are archived and searchable on the web at: https://www.mail-archive.com/emc-pstc@listserv.ieee.org/ Website: https://ewh.ieee.org/soc/pses/ Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to unsubscribe) List rules: https://ewh.ieee.org/soc/pses/listrules.html For help, send mail to the list administrators: Mike Sherman at: msherma...@comcast.net Rick Linford at: linf...@ieee.org For policy questions, send mail to: Jim Bacher: <j.bac...@ieee.org> _________________________________________________ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
