Why earthing required in Electronics?

Thread Starter

jkj123

Joined Nov 5, 2008
22
Don't think me as a kid. Do we really require an earthing in electronic system which is working on 12VDC and having RS485 communication with another system of same type (I mean 12VDC).
I dont say about Ground, it is about Earthing which is using in the AC mains.

Please share your valuable ideas, because I have seen a lot of electronic equipments, even Laptop power supply is using Earth line.

Thanks,
Jaison
 

Thread Starter

jkj123

Joined Nov 5, 2008
22
Thanks a lot for your help and that article.
But that article is talking mainly about high voltage AC voltages.
My doubt is mainly in the area of earthing (3rd Pin) used in power supplies which are used for laptops and such types of electronic gadgets.
 

Wendy

Joined Mar 24, 2008
23,415
Yes, but they still plug into a wall recepticle. It stated with high voltage, so the rules apply throughout the system. What happens if the power supply malfunctions in a catastrophic way?

When they are running off of internal batterys the third wire and power supply is gone.
 
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