Hi James, the citation from clause 5.4.2.3.3 is from EN 623681-1:2014 which is the European adoption of IEC 62368-1:2014 (Ed. 2.0). Please note that this paragraph has been modified in Edition 3.0 of the standard (IEC 62368-1:2018) that has been adopted as EN IEC 62368-1:2020:
"If a circuit isolated from the mains is connected to the main protective earthing terminal through a protective bonding conductor, the required withstand voltage may be one overvoltage category lower or one AC mains voltage lower in Table 12. For an AC mains up to and including 50 V RMS, no adjustments are made." Please note that the reduction of the required withstand voltage is only valid for this specific secondary circuit, as Scott already pointed out, i.e. the clearances may be reduced in this specific secondary circuit only. You may find similar relaxations in other standards, e.g. IEC 61800-5-1, clause 4.3.6.2.3, with some examples in Annex B. The concept of overvoltage categories is explained in clause 4.3 of the generic IEC standard for insulation coordination IEC 60664-1. It is a requirement for the reliability of equipment in case of overvoltages (e.g. caused by lighting): "Equipment of overvoltage category IV is for use at the origin of the installation. NOTE 1 Examples of such equipment are electricity meters, primary overcurrent protection devices and ripple control units. - Equipment of overvoltage category III is equipment in fixed installations and for cases where the reliability and the availability of the equipment is subject to special requirements. NOTE 2 Examples of such equipment are switches in the fixed installation and equipment for industrial use with permanent connection to the fixed installation. - Equipment of overvoltage category II is energy-consuming equipment to be supplied from the fixed installation. If such equipment is subjected to special requirements with regard to reliability and availability, overvoltage category III applies. NOTE 3 Examples of such equipment are appliances, portable tools and other household and similar loads." Kind regards, Bernd Von: Scott Aldous <[email protected]> Gesendet: Dienstag, 15. Juni 2021 21:21 An: [email protected] Betreff: Re: [PSES] Overvoltage Categories (OVC) and "Reliable" Earthing - 62368-1 vs 60601-1 Hi James, * Do any other safety standards share this reduction in OVC for PE connected circuits? I'm not completely sure what you mean by the reduction in OVC. This is intended to refer only to the secondary circuit OVC, not the primary circuit OVC. So in the example you gave, the secondary circuit would be classified as OV Cat II, but the primary circuit would still be classified as OV Cat III. This is clearer in IEC 60950-1... With regard to other safety standards, IEC 60950-1 has the same provision (see clause 2.10.3.6), which is likely the source of the requirement in IEC 62368-1. IEC 60065 has something similar but not quite the same in clause 13.3.3. IEC 62109-1 also has a similar concept in clause 7.3.7.1.2c). This one is interesting because it more directly discusses the reduction of OVC across galvanic isolation, with 2 energy sources (photovoltaic input and AC mains connection). If you happen to have this standard, a read through of the whole of clause 7.3.7.1.2 could be helpful. Here's a snippet from 7.3.7.1.2e): where isolation is provided by means of isolation transformers, optocouplers, or similar galvanic isolation devices, between a considered circuit and an adjacent mains or PV circuit, the impulse withstand voltage rating of the considered circuit is reduced by one level from that of the adjacent circuit; if more than one adjacent circuit is involved, the highest resulting impulse withstand voltage rating applies. On Tue, Jun 15, 2021 at 10:21 AM Joe Randolph <[email protected]<mailto:[email protected]>> wrote: Hi James: I cannot provide a detailed answer to your question, but it appears that part of the analysis depends on what qualifies as "reliable earthing." Most safety standards make a distinction between "reliable earthing" (typically accompanied by a definition), and what might be called "unreliable earthing", which is not a technical term in most standards but can be interpreted to mean any earthing that does not qualify as "reliable earthing." The basic concept is that an earth connection that was permanently installed by an electrician is generally considered "reliable," but the earth pin on a standard household Type A AC mains plug is generally considered "unreliable." These connections are generally considered "unreliable" because it is known that some household AC mains sockets have missing ground connections, and it is also known that some users will use a "cheater adapter" to put a 3-pin grounded plug into a 2-pin ungrounded outlet. If the safety protection method used in the product is very dependent on being connected to a reliable earth, the safety standard typically requires that the earth connection must be "reliable" as defined elsewhere in the standard. Note that different standards have different internal definitions for what constitutes a "reliable" earthing connection. So, it's important to use the internal definition that appears in the standard you are actually using. Joe Randolph Telecom Design Consultant Randolph Telecom, Inc. 781-721-2848<tel:(781)%20721-2848> (USA) [email protected]<mailto:[email protected]> http://www.randolph-telecom.com<https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.randolph-telecom.com%2F&data=04%7C01%7C%7Cecfa752df00b4e6057d908d93032dc51%7C39288a38ff19432c80111cd9d0dff445%7C0%7C0%7C637593817271039410%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=BRlD6weaT%2F6AIxrBrybNaZse7XMZg%2FB2E7StvEtNKS4%3D&reserved=0> From: James Pawson (U3C) [mailto:[email protected]<mailto:[email protected]>] Sent: Tuesday, June 15, 2021 6:53 AM To: [email protected]<mailto:[email protected]> Subject: [PSES] Overvoltage Categories (OVC) and "Reliable" Earthing - 62368-1 vs 60601-1 Hello safety experts, A question regarding overvoltage categories and "reliable" earthing and some differences between standards. I would be interested to hear your thoughts. Background: When determining the required withstand voltage for insulation, EN 62368-1 states that: 5.4.2.3.3 Determining required withstand voltage ... If a circuit isolated from the mains is connected to a main protective earthing terminal that complies with 5.6.7, the required withstand voltage may be one overvoltage category lower in Table 13 (JP: Table 13 in this case replicates table F.1 from IEC 60664-1 of OVC vs impulse voltage) 5.6.7 Reliable earthing ... For permanently connected equipment earthing is considered to be reliable ... Summary: A permanently connected piece of equipment with isolated (secondary) circuit connected to PE is classed as being one OVC lower than it's installation eg. OVC III becomes OVC II with all of the reductions in creepage/clearance/insulation that this results in. Problem: * I cannot find an equivalent clause regarding overvoltage categories and reliable earthing in EN 61010-1. * Also, I cannot see anything in EN 62368-2 that explains this decision. * It looks like EN 62368-1 is a bit of an outlier in this respect. Questions: * Have I missed the clause in EN 61010-1 that covers this? (I've looked carefully through Clause 6 and Annex K) * Do any other safety standards share this reduction in OVC for PE connected circuits? * Have I understood the clauses in EN 62368-1 properly? * I've seen (and subsequently unable to find again) a reference that resistance to transient overvoltages is partly a reliability of equipment issue. Are the writers of EN 62368-1 less concerned about reliability? ;-) As always, thanks in advance James James Pawson The EMC Problem Solver Unit 3 Compliance Ltd EMC : Environmental : Safety : CE + UKCA : Consultancy www.unit3compliance.co.uk<https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.unit3compliance.co.uk%2F&data=04%7C01%7C%7Cecfa752df00b4e6057d908d93032dc51%7C39288a38ff19432c80111cd9d0dff445%7C0%7C0%7C637593817271039410%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=R2PLVrTWPXYPVD9WNPiBrrbFj1gYq801mtrpzILX3NU%3D&reserved=0> | +44(0)1274 911747<tel:+44%201274%20911747> | +44(0)7811 139957<tel:+44%207811%20139957> 2 Wellington Business Park, New Lane, Bradford, BD4 8AL Registered in England and Wales # 10574298 ________________________________ [AVG logo]<https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.avg.com%2Finternet-security&data=04%7C01%7C%7Cecfa752df00b4e6057d908d93032dc51%7C39288a38ff19432c80111cd9d0dff445%7C0%7C0%7C637593817271049365%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=S9f%2BrwKHb%2BUdRa9iWjiDd41DtNSsFpEG37aZlvVFpJ4%3D&reserved=0> This email has been checked for viruses by AVG antivirus software. www.avg.com<https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.avg.com%2Finternet-security&data=04%7C01%7C%7Cecfa752df00b4e6057d908d93032dc51%7C39288a38ff19432c80111cd9d0dff445%7C0%7C0%7C637593817271059320%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=6a3dsf08PQuiCT%2BPr59wbEqu%2BrK%2FFRAnmD%2FwQn6WWHo%3D&reserved=0> - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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