Hello Steve,
Following up on Kevin’s message about IEC 62368-1, there are some requirements in Annex L (Disconnect Devices) L.8 Multiple power sources Where a unit receives power from more than one source (for example, different voltages/frequencies or as redundant power), there shall be a prominent instructional safeguard in accordance with Clause F.5 at each disconnect device giving adequate instructions for the removal of all power from the unit. The elements of the instructional safeguard shall be as follows: – element 1a: IEC 60417-6042 (2010-11); and IEC 60417-6172 (2012-09) – element 2: “Caution” or equivalent word or text, and “Shock hazard” or equivalent text – element 3: optional – element 4: “Disconnect all power sources” or equivalent text If more than one such disconnect device is provided on a unit, all these devices shall be grouped together. It is not necessary that the devices be mechanically linked. All the best James James Pawson Managing Director & EMC Problem Solver Office hours: My mornings are reserved for full attention on consultancy, testing, and troubleshooting activities for our customers’ projects. I am otherwise 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. 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 From: Douglas Powell <[email protected]> Sent: Friday, April 7, 2023 6:14 PM To: [email protected] Subject: Re: [PSES] Multiple electrical power sources Although related to the installation of products and not necessarily the product desgins themselves, you might review NFPA 70, National Electric Code. They do have requirements when using multiple sources. -Doug Douglas E Powell Laporte, Colorado USA <mailto:[email protected]> [email protected] <https://www.linkedin.com/in/coloradocomplianceguy/> LinkedIn (UTC -06:00, US-MDT) On Thu, Apr 6, 2023 at 2:41 PM Steve Brody <[email protected] <mailto:[email protected]> > wrote: A new question. A client's product is using two independent AC power sources on a product, but I can't find anything in 61010-1 60204-1 that provide any guidance on compliance. The obvious is that the sections of the product that are fed from source A or B are not interrelated in any way that would create a hazard for for the other section, that there be a warning label adjacent to each input that says there are multiple AC sources, and that each section has it's own circuit protection and disconnect, even if a facility disconnect is used for both. What am I missing? Thanks, Steve Brody <mailto:[email protected]> [email protected] C - 603 617 9116 - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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