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Posted by Charles Hansen (M ) on August 26, 2008 at 21:40:33

In Reply to: RE: If you're referring to the 'double insulated' designation that allows manufacturers of small posted by jea48 on August 25, 2008 at 11:36:39:

< < The AC power wiring is double insulated. The case is floating.... > >

Actually the case is connected to the signal ground of the internal circuitry.

I think the main reason that most manufacturers use 3 wire power cords with a safety ground is ignorance. It's the easiest way to ensure safety, and it's also the method most commonly espoused in textbooks.

Kind of like FETs versus bipolar transistors. All the textbooks focus on bipolars. Not much is generally known about FETs. So designers follow the path of least resistance. It's too much work to dig up all the stuff to learn about some other technology like FETs or double insulation.

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