Back in my computer days, IEC 950 clause 1.2.8.7 defined a "Hazardous Energy Level" as "A stored energy level of 20 J or more, or an available continuous power level of 240 VA or more, at a potential of 2 V or more."
Ever since, we refer to 240VA or more as an "Energy Hazard" and take that into consideration as part of our Risk Assessment even though it is not called out specifically in the IEC/EN 61010-1 (the safety standard we use at my present place of employment). The Other Brian -----Original Message----- From: Ralph McDiarmid [mailto:ralph.mcdiar...@schneider-electric.com] Sent: Wednesday, June 08, 2016 3:11 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] fire safety test methods for different country standards Hi Chuck, A poor choice of words on my part. I should have written, "in most of the standards I have worked in". Those include CSA107.1, UL1741, UL1012, and IEC62109-1 The 240VA (I think they meant 240W) must have come from some base standard as a normative reference. I don't know what is special about that number, but some committee somewhere may have concluded that power (rate of energy) below that threshold was unlike to be a source of ignition. I've seen 30V and 8A used to define an energy limited, extra-low voltage circuit. (UL calls that a Class 2 I think). The product of 8A and 30V gives 240VA as a third criterion. I'm not sure it's that simple though. Regards, Ralph McDiarmid Product Compliance Engineering Solar Business Schneider Electric *Please consider the environment before printing this e-mail -----Original Message----- From: Chuck August-McDowell [mailto:chu...@meyersound.com] Sent: Wednesday, June 08, 2016 11:22 AM To: Ralph McDiarmid <ralph.mcdiar...@schneider-electric.com> Subject: RE: [PSES] fire safety test methods for different country standards Hi Ralph, I live in the IEC/EN/UL 60065 standard world. Could you point at "most standards appear to limit rate of energy transfer (e.g. 240W)" standard? IEC/EN/UL 62368-1? IEC/EN/UL 60950-1? Thank you, Chuck McDowell Compliance Specialist Meyer Sound Laboratories Inc. -----Original Message----- From: Ralph McDiarmid [mailto:ralph.mcdiar...@schneider-electric.com] Sent: Wednesday, June 08, 2016 9:27 AM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] fire safety test methods for different country standards Not following instructions is foreseeable misuse and needs a FMEA and maybe a Fault Tree analysis too, if a hazard is the anticipated result. Getting back to this HB enclosure discussion earlier in this discussion thread, I see that most standards appear to limit rate of energy transfer (e.g. 240W) and may also place limit on available current. The expectation is, I think, that a power-limited device cannot ignite something. I assume there is lots of history that assumption. Ralph McDiarmid Product Compliance Engineering Solar Business Schneider Electric -----Original Message----- From: Richard Nute [mailto:ri...@ieee.org] Sent: Sunday, May 22, 2016 5:40 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] fire safety test methods for different country standards Hi John: Thanks for your additional comments. > Could it be that the scenarios which the standards committees envisage > are not "the real deal" In my opinion, this is the case. > OR that the > products which cause the fires just don't comply with the standards? Of course, counterfeit and non-complying products are in the marketplace. Some of these do catch fire. My interest is the cause of fires in products which comply with the standards. The "In Compliance" reports do identify the counterfeit products, but these seem to be in the minority. Fires occur under fault conditions. Not following instructions is a sort-of fault condition, but rarely the cause of a fire. 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