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RE: Question for you...

<< the designer does not connect the ground to the either components IEC >>

I assume you mean he does not connect the chassis (normally tied to signal ground if the designer knows anything at all about grounding) to the ground pin of the IEC inlet, which would in turn be connected to the AC safety ground of your house.

In this case, the AC safety ground only connects to the IEC connector and not the circuitry nor the case. This achieves the same effect as "floating" the component with a "cheater" plug, but without the extra contact resistance of the "cheater" plug.

This does avoid the introduction of RFI noise that is present on the AC safety ground. But it also requires that the unit be "double insulated" to provide safety to the end user. If he doesn't use "double insulation" the risks are minimal (as long as he uses good construction techniques). But if he starts selling them this way, he should use double insulation so that he doesn't get sued on the off chance that somebody *does* get hurt.

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