On 16/11/2020 12:55, Andy Burns wrote:
The Natural Philosopher wrote:
Blimey.
Imagine what AFDDs are going to be like, a DSP to discriminate between
harmless sparks and fiery sparks?
I'll concedeĀ* that. They have devloped since my time...BUT if you look
at the circuit diagram later in that video, you will see than no earth
is involved.
Yes, the reference circuit for the chip shows it has a "substrate ground"
http://eng.fmsh.com/AjaxFile/DownLoadFile.aspx?FilePath=/UpLoadFile/20140904/VG54123_ds_eng.pdf&fileExt=file
but no PE or FE earth connection, makes you wonder if MK have added
something extra on the PCB for lost-neutral detection?
There is no actual requirement for a RCBO to have a FE connection (and
indeed many brands don't), however if its present, then the standards do
have things to say about how it should work IIUC.
--
Cheers,
John.
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