Dear colleagues. I would be interested in finding out how the hipot values (electric strength) were derived as they have been increased in 62368-1.
Regards; Ian McBurney Lead Compliance Engineer Allen & Heath Ltd. Kernick Industrial estate, Penryn, Cornwall. TR10 9LU. UK. Tel: 01326 372070 Email: [email protected] From: Regan Arndt <[email protected]> Sent: 26 February 2020 04:49 To: [email protected] Subject: Re: [PSES] IEC 61010-1:2010 hazardous DC voltage Hi Rich. Thanks for your feedback. Correction/clarification. I was not trying to ‘convert’ to DC using 1.414 (root 2). I merely used that ‘multiplication factor’ (1.414 & sometimes just 1.4) based on the widely used/misused?/abused? that is used in the industry when determining ‘equivalent’ DC values, just like one commonly does when calculating the hipot test values. See: https://electrical-engineering-portal.com/what-is-hipot-testing-dielectric-strength-test<https://url6.mailanyone.net/v1/?m=1j6odd-0007hq-58&i=57e1b682&c=lDZM04QcZGC_W6K0uXvnBk4boCp7Gfni32HnX5MRFX13SfPIbFvhpkt_MO8W5amHSFCxb50glQUwm5KZQUdS5AAhwMKczGYbaq0I6SfnScdcZh5igSK2p2c4qj0Sad4Re3Gs4NM-3TW5fn_uU_cUHYez920fPCuFgkj4vDjJ4VuMeAB5omjMZ848DazAHj9EX1zeZxSMsU5Hi-ujhzB2x9uBxgQ1lcJ7eIWAjwScLUJkI2qt7RlEydwL_BY83LElF8D6ap2EihyqwR4GlvzwizqGMitVE2Zqxemwedi24Lcju-zREUtMn8o1cSAcSYjPJVM9zPGhFG14E3tEvqdS-YrtkZdkjS4eUSReUiWWzygMiw7dzxwAGrVS73e5g9UnRr12IxanjKcO5t_RFVvRjR_KYIBGCQl69Lsv5jFTr0pHgZSDybQSnwTZJtiFDpzLp4g2wBxzqsq-rSOc5fR-FXJeZKuNKMqj2zd0O5pmTt21dA7EdEAq29vSoy0jbiOHG-akL_aTMArojpsTInhth8AAUf63BjYQ3HmTndd4YhFDUYAgRosBun8tu6xHgpcLUeVuubIuQBcVZva8p6-YWFk0mfIk_Fi-abkQn8fsQqoem6MNyU3-WstG2Aux6GlKBLnt5Xu3wIBWFw2eP6EJQw>, where Jignesh Parmar quotes in his article: “Therefore, if we use dc test voltage, we ensure that the dc test voltage is under root 2 (or 1.414) times the ac test voltage, so the value of the dc voltage is equal to the ac voltage peaks.” Another classic example comes from the 60950 standard for hipot values. 1500 VAC/2121 DC (calculation factor = 1.414) That being said, I look forward to hear a response from someone on TC66 on why they chose 70V. It would also be great if you could do a whitepaper (& speak) on the understanding of how the body reacts to AC & DC for this year’s PSES symposium in Chicago? 😉 Regan On Tue, Feb 25, 2020 at 4:07 PM Richard Nute <[email protected]<mailto:[email protected]>> wrote: Hi Regan: The “bump” occurred from 1st edition, 1990, to 2nd edition, 2001. The 2nd, 2001, and 3rd, 2010, are the same. Be careful with your math and DC interpretation. The rms voltage limit is 33. The ac peak is 1.414 x 33 = 46.7. The DC is 70, which is unrelated to the AC voltages (which is because of how the body reacts to AC and DC). As to the rationale for the change from 1st to 2nd, I suggest you find a member of TC66 and ask for the documents preceding the 2nd. Touch voltages are specified in IEC TS 61201. In this standard both 30 and 33 volts rms are listed, with very little difference in body reaction. Same for 60 versus 70 volts DC. Best regards, Rich From: Regan Arndt <[email protected]<mailto:[email protected]>> Sent: Tuesday, February 25, 2020 2:38 PM To: [email protected]<mailto:[email protected]> Subject: [PSES] IEC 61010-1:2010 hazardous DC voltage Dear fellow members, I am trying to understand the 'rationale/history' of why TC66 bumped up the DC voltage by a mere 4 volts for hazardous voltages. As we know by simple math, 46.7 Vp x 1.414 = 66 VDC.............where, why and how did the extra 4 volts come about? I need a history lesson here.... ;) Also, will these voltages also come back to normal in Ed 4? (i.e. 42.4 Vp, 60 VDC) Thanks for shedding any light on this? Regan Arndt - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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