Hey Kai Bro .

>Because if EMI and ESD event is present and hit your >application your signal ground will shift in any >case. But with one remarkable difference: Without >shield EMI and ESD event will be shunted to signal >ground THROUGH sensible parts of your circuit. But >WITH shield same interference will be shunted >directly to signal ground, WITHOUT flowing THROUGH >circuit and possibly damaging it.

///////Ya sound so intelligent in EMI please say more on the issue ,how exactly a shield 'FARADAY CAGE' work in little *MORE* details and what happens if reference to PE is there or not in the battery side . If battery is referenced is DC/DC converter required to be referenced ? I think yes but dono .I wanna know about a *TOTALLY* floating systems do they exist for RS485 or what considerations to take . \\\\

Kai Man RU EMI,EMC engineer ?


Kindly/