IMHO, the subject of “tamper-proofing devices” will be around for a “long time” because, once a “new” device is introduced, then “someone” will (pretty soon!) come up with a “workaround” – it’s just a case of when the workaround becomes available, and then when will someone find and use it, and NOT if they will! L
By way of example, today I finally looked to see if I could fix an old non-functional plug-in mains-supplied timer, but then found that the 2 parts of the body were secured by “tamper-proof” screws, which were roughly like a normal flat-blade screw head, but with a gap in the centre for a spigot on the end of the removal tool – which I have had in the toolbox for, probably, nearly a decade! Thus I had the timer apart in a few minutes (and then found the cause of the problem quite quickly). Thus it’s a matter of “not if”, but “when”. OTOH, to “come down to ground” - in practice, it all comes down to the question as to whether the “intended users” are likely to be able to find the workaround, and would then want to, bypass the safety measures ?????? John E Allen W. London, UK From: Doug Nix [mailto:d...@ieee.org] Sent: 08 April 2019 21:39 To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Tamper-proof Hardware All, ISO 14118 discusses the use of tamperproof screws when installing interlocking devices on guards. This is only one specific example of where this can be an effective safeguard against tampering by users. Maintenance personnel are another topic, since they would almost certainly have tools to remove the tamperproof hardware. Doug Nix d...@ieee.org +1 (519) 729-5704 On 6-Apr-19, at 16:27, Robert Johnson <john...@itesafety.com> wrote: I notice that IEC 62368 mentions tamper-proof screws in a couple places (articles 0.8, 0.11), although not explicitly requiring them. It describes tamper-proof screws as providing a supplemental safeguard against hazards. I would take that to mean for level 3 hazards, for example mains terminals, basic protection or other measures would ALSO be needed such as covers using regular screws. What are the implications for mains plugs assembled with slotted screws? I have always assumed that requiring the use of a tool would provide protection against access to level 3 hazards. Access to mains terminal requirements seems to only require a tool per clause G.7.6.1. and V.1.1 The standard uses the term “tamper-proof screw” without definition. Is it slotted, Phillips, Torx, security Torx, Allen, hex, Robertson, or others <https://en.wikipedia.org/wiki/List_of_screw_drives> ? Are there examples where ordinary fasteners must be replaced with tamper-proof ones? Bob Johnson - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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