Daniel,

 Do you have any relatives in the Huntington, Indiana area?
 Just curious.  I'd be interested in knowing.

 Thanks and Regards,

 Jim

> -------- Original Message --------
> Subject: RE: [EE] Fail-safe Safety-Critical Systems Design
> From: Daniel Schacht <daniel-s@swbell.net>
> Date: Mon, June 05, 2017 12:21 pm
> To: piclist@mit.edu
>=20
>=20
> Recently, a young man was electrocuted in his bath while using his=20
> cellphone connected to his mains charger. What that told me was the=20
> power supply manufacturer did not isolate the wall charger supply from=20
> the "hot" line. the circuit was in an  insulating case, right? Should=20
> have been save, right? I guess not. I know you do not want to design for=
=20
> a lawsuit or a criminal charge.
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> The capacitor in the circuit does not necessarily limit the current to a=
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> safe level. Also, if the "hot" and the "neutral" or ground get reversed=20
> by accident by an inattentive electrician or amateur, someone can be=20
> killed. It is a good idea to design for safety by using a UL or other=20
> tested and approved isolation transformer. Even better, purchase an UL=20
> approved isolated wall transformer. Take a few apart to make sure the=20
> manufacturer knows what they are doing. I hope this helps.
>=20
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