Hello Brian, This was defined by a NRTL to be a Class III battery charger.
Thank you, Mark From: Brian O'Connell [mailto:[email protected]] Sent: Wednesday, September 20, 2017 1:55 PM To: [email protected] Subject: Re: [PSES] Battery Charger From: Schmidt, Mark [mailto:[email protected]] Sent: Wednesday, September 20, 2017 7:38 AM To: [email protected]<mailto:[email protected]> Subject: [PSES] Battery Charger Hello Group, I am trying to understand which standard would be applicable for a single Li-on battery charger. It would be powered by an existing 12 VDC LPS that already has all the required regulatory evaluations and markings on it. We already use this EPS on many of the products that we currently have safety reports on and are Listed. This battery charger would be for charging an additional lithium-ion battery (7.4V, 2600 mAh) that we use with some of our existing products. Our products have their own charge circuitry but the marketing guys want to have an independent charger source so the end user can just pop in a fully charged battery when needed. Our devices are used on a lot of factory floors (battery powered). They typically only use the EPS to charge their battery in the device when the leave for the day or maybe at lunch or whatever. This new charger's construction would be a plastic (94V-1), operate at 12 VDC input, output ~8.4 VDC 1A for charging one battery pack at a time. The PCB would be FR4, 94V0 material. Standard center-pin/barrel type power plug from the LPS. It would be designed CEC compliant; some minor circuitry for charge control most protection is in the 2 cell battery pack. Would have LED indicator(s) for charge status. Size: approximately 5" x 3" x 2" Are there any battery charger standards that may be applicable? Yes, there are several scoped standards. Does this battery charger need to be Listed or Recognized by NRTL. Per OSHA, not if Class III equipment and marked with power supply requirements and battery delimiters. There are some 'typical' industrial and civil and military environments where it would be considered pro forma for this type of equipment to bear a NRTL mark. End-use equipment shall not be 'recognized' per the meaning of a scoped UL CCN. Any thoughts or inputs are welcome? Design for the eventuality that a battery WILL self ignite. Design for safe charge currents and voltages for any charger single-fault condition. Hire or contract with someone that has done this several times as a corporate compliance engineer. Few NRTL engineers understand battery charger topologies, and fewer understand both the software and hardware. No, I will not review your design, but there are several grey-beards (ok they do not really have beards, but are wiser than myself) that reside within the virtual walls of this listserv whom do contract work. Regards, Mark - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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