Hello all, Not sure if this is an amusing contradiction or I'm missing something? See green highlight below.
All the best James EN 62368-1:2020 5.5.7 SPDs Where a varistor is used between a mains circuit at ES3 voltage and protective earthing: - the earth connection shall comply with 5.6.7; and - the varistor shall comply with Clause G.8. Where a varistor is used between line and neutral or between lines, it shall comply with Clause G.8. Where an SPD is used between the mains and protective earthing, it shall consist of a varistor and a GDT connected in series, where the following applies: - the varistor shall comply with Clause G.8; - the GDT shall comply with: * the electric strength test of 5.4.9.1 for basic insulation; and * the external clearance and creepage distance requirements of 5.4.2 and 5.4.3 respectively for basic insulation. NOTE 1 Some examples of SPDs are MOVs, varistors and GDTs. A varistor is sometimes referred to as a VDR or a metal oxide varistor (MOV). NOTE 2 It is not a requirement of this document that surge suppressors comply with any particular component standard. However, attention is drawn to the IEC 61643 series of standards, in particular: - IEC <https://www.evs.ee/en/evs-en-61643-21-2002-a2-2013> 61643-21 (surge suppressors in telecommunications application) - IEC <https://www.evs.ee/en/evs-en-61643-311-2013> 61643-311 (gas discharge tubes) - IEC <https://www.evs.ee/en/evs-en-61643-321-2003> 61643-321 (avalanche breakdown diodes) - IEC <https://www.evs.ee/en/evs-en-iec-61643-331-2020> 61643-331 (metal oxide varistors) - IEC <https://www.evs.ee/en/evs-en-iec-61643-341-2020> 61643-341 (thyristor surge suppressors TSS). And yet. G.8 Varistors G.8.1 General A varistor shall comply with IEC 61051-2 or IEC 61643-331:2017, whether a fire enclosure is provided or not, taking into account all of the following: James Pawson Managing Director & EMC Problem Solver Unit 3 Compliance Ltd EMC : Environmental & Vibration : Electrical Safety : CE & UKCA : Consultancy <http://www.unit3compliance.co.uk/> www.unit3compliance.co.uk | <mailto:[email protected]> [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 <mailto:[email protected]> [email protected] or call 01274 911747. Our lead times for testing and consultancy are typically 4-5 weeks. - ---------------------------------------------------------------- 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 <[email protected]> All emc-pstc postings are archived and searchable on the web at: https://www.mail-archive.com/[email protected]/ 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: [email protected] Rick Linford at: [email protected] For policy questions, send mail to: Jim Bacher: <[email protected]> _________________________________________________ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1
