James:
I think it was Richard Nute, who has been instrumental is grounding and safe equipment throughout his carrier. He would love to hear from you. He will be guest speaker for Virtual chapter of PSES (Product Safety Engineering Society) of IEEE in coming months. Please send me an email and I can provide you with the details. Best Regards and Be Safe Bansi Patel BRP Consultants PSES BoG at large 2020-2023 PSES Vice President of Conferences 2020-2024 [email protected] <mailto:[email protected]> M: <tel:909-260-9403> 909-260-9403 Please plan to attend Face-to-Face event: ISPCE 2024, (April 30-May 2, 2024); Chicago Area, Illinois, USA https://2024.psessymposium.org <https://2024.psessymposium.org/> From: James Pawson (U3C) <[email protected]> Sent: Wednesday, February 28, 2024 1:39 AM To: [email protected] Subject: Re: [PSES] 61010-1 hazardous live classification Hello all, Thanks for all the responses and for some thoughts on the nuances. I'm helping a customer with their risk assessment so being able to understand the risks a little better is most useful. Someone pointed out the relaxation in EN 62368-1 for pulse amplitudes based on duty cycle which is also going to be useful. Much appreciated as always. 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 <http://www.unit3compliance.co.uk/> | [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 available/contactable between 1300h to 1730h Mon/Tue/Thurs/Fri. 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. From: James Pawson (U3C) <[email protected] <mailto:[email protected]> > Sent: Monday, February 26, 2024 1:38 PM To: [email protected] <mailto:[email protected]> Subject: [PSES] 61010-1 hazardous live classification Hello all, I hope this safety question is a fairly simple one for you, it being Monday after all. 1. A piece of equipment with a power supply output for driving a lamp. It has two modes, DC and pulsed. 2. Both of the output voltage connections are on accessible terminals (checked using finger probe) 3. Classifying voltages as per EN 61010-1 clause 6.3.1 (limit values for accessible parts, normal operating conditions) 4. DC mode runs at 46Vdc maximum. This is less than 60Vdc so is not Hazardous Live 5. Pulse mode runs at 46Vdc pulsed (frequency up to 1kHz, duty cycle can vary down to 0.01%) which is an AC waveform greater than 42.4V peak so is Hazardous Live 6. The output from the equipment is low impedance so is more than capable of sourcing the required 0.7mA through the IEC 60990 body model. Quick sketch attached to illustrate the concept. I even ran a SPICE simulation to make sure I wasn't getting something wrong. I would appreciate the sanity check! 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 <http://www.unit3compliance.co.uk/> | [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 available/contactable between 1300h to 1730h Mon/Tue/Thurs/Fri. 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. 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To post a message to the list, send your e-mail to [email protected] <mailto:[email protected]> All emc-pstc postings are archived and searchable on the web at: https://www.mail-archive.com/[email protected]/ <https://www.mail-archive.com/[email protected]/%20> Website: https://ewh.ieee.org/soc/pses/ <https://ewh.ieee.org/soc/pses/> Instructions: https://ewh.ieee.org/soc/pses/list.html (including how to unsubscribe) <https://ewh.ieee.org/soc/pses/list.html> List rules: https://ewh.ieee.org/soc/pses/listrules.html For help, send mail to the list administrators: Mike Sherman at: [email protected] <mailto:[email protected]> Rick Linford at: [email protected] <mailto:[email protected]> For policy questions, send mail to: Jim Bacher at: [email protected] <mailto:[email protected]> _____ To unsubscribe from the EMC-PSTC list, click the following link: https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC <https://listserv.ieee.org/cgi-bin/wa?SUBED1=EMC-PSTC&A=1> &A=1 - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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