How do I explain it? Potential difference in the system discussed is independent

[vish_al210]

Dear Vishal,

In lieu of the original attached schematic, both the systems are independent and both share only a common Earth conductor for protection. This is how most of the electrical systems are inter-connected with each other for protection.

Abnormilities in either circuit will never affect each other as both are independent closed circuits feeding independent loads. Hence, in my opinion, your colleague is wrong!

Regards,
Shahvir

I know, but I will try to make him understand that, may be the way ssana has put it.
That may do the trick.

 

[vish_al210]

Do you know even if the wire you use is 10 gauge or 8 gauge. DC wise is very low resistance. Because of the inductance, any moderate frequency, it is quite high impedance. There are electronics that communicate through the AC wall plug. YOu plug the transmitter in one wall plug of the house and recievers in different plugs throughout the house, you can set up a communication link throughout your house using the AC wires! That is noise you are talking about! Big time. Once you go into AC( not 60Hz AC), all bets are off.

But Yungman, the ckt I posted in the DC part is a pure DC ckt, with battery source. So is it still a problem?

 

[yungman]

But Yungman, the ckt I posted in the DC part is a pure DC ckt, with battery source. So is it still a problem?

In a small way, yes. As I said, there are voltage drop on [DB] due to ckt B, ckt A is going get different voltage from the battery supply. Yes if it is all DC, it is not that important.

BUT did you really read my long post on how ckt A or ckt B can inject noise even though it take DC power?

 

[vish_al210]

In a small way, yes. ...BUT did you really read my long post on how ckt A or ckt B can inject noise even though it take DC power?

Hi, sorry Yungman, was entangled with my wrk the last few days.
And well yes I did go through the :) long post, actually was not that long.
I thought the toroid is to protect the ckt from noises (EMI, ESD, Switching noises) from the power distribution side and also to protect the other devices on the main lines from the switching noises. But in the example that you have cited the ckts (laptops or any other appliance) share the same power source (both phase and neutral). That is a problematic situation.
I don't know why that would apply on the ckts that we have been discussing here. If I am missing something do let me know...