Yes new GFCIs are required to have built in automatic testing as most old ones installed are not getting the required periodic manual testing.
From: MIKE [mailto:msherma...@comcast.net] Sent: Thursday, March 08, 2018 5:34 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] IEC60950-1 Limited Power Source via IC current limiter I regard North American household GFCIs and industrial shunt trip GFCIs to not be fail safe because they can fail silently and therefore require period testing to verify continued functionality. I believe that the UL standard for GFCIs has recently been updated to require some periodic self testing to address this issue. Mike Sherman Graco Inc. Sent from XFINITY Connect Mobile App ------ Original Message ------ From: John Woodgate To: EMC-PSTC@LISTSERV.IEEE.ORG<mailto:EMC-PSTC@LISTSERV.IEEE.ORG> Sent: March 8, 2018 at 3:57 PM Subject: Re: [PSES] IEC60950-1 Limited Power Source via IC current limiter Probably some fail-safe, some reliable. I think that this is why 'safety' involves risk-assessment, not just meeting standards. John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk<http://www.woodjohn.uk> Rayleigh, Essex UK On 2018-03-08 21:41, Richard Nute wrote: In my early days in product safety, safety was prohibited from relying on conduction in a vacuum, gas, or semiconductor. Today… we rely on semiconductor current limiters and similar devices, e.g., GFCI control circuits. Are such limiters and control circuits fail-safe devices? Or, are they “reliable” devices and circuits where their lifetime is expected (proven) to be greater than the host equipment? Rich - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. 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