Ethernet between two houses

I wasn't thinking of adjacent turns, rather a block of 50V worth of turns, ie a 230V winding will consist of 5 layers of turns with a barrier between them.
OK, so it would between one layer and the next - but, even then, it's not uncommon to have insulation between the barriers.
I'm not sure where the barrel scraping comes in, it would not occur to me to introduce any additional isolation between systems or buildings ....
The 'barrel scraping' referred to the discussion in general since, just like you, it would not occur to me to even consider the need for additional isolation between systems or buildings! Are the wired ethernet connections we're talking about any more a 'cause for concern' than, say, the public telephone network?
but the untimate is of course a fibre optic.
Yep - but optically-isolated copper would probably be almost as good (the only uncertainty would be the 'withstand voltage of the opto-isolators) - or, of course, 'wireless.

Kind Regards, John
 
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What sort of transformers adopt that approach?

among other uses

Isolation transformers on low noise audio circuits
Radio frequency power amplifier oputs ( more for purity of the sine wave )
Modem line inter-face transformers
 
among other uses ... Isolation transformers on low noise audio circuits ... Radio frequency power amplifier oputs ( more for purity of the sine wave ) ... Modem line inter-face transformers
OK, but, if they utilise enamelled wires, I presume that approach would not be used if one wanted appreciable 'voltage isolation' between the windings?

I have little experience of the first and third applications you mention but, as for "RF power amp outputs", the most common arrangement I have dealt with has involved no physical contact at all between the primary and secondary windings, let alone having them twisted together (which presumably produces all sorts of issues in relation to capacitive coupling) - what sort of RF frequencies are you thinking of?

Kind Regards, John
 
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To get a good symmetry the wires for the two ( or three ) windings is twisted before being wound onto the core. Hence the isolation depemd on the enamel on the wire.

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But this won't provide the KV's of isolation required for Ethernet use.
 
I have little experience of the first and third applications you mention but, as for "RF power amp outputs", the most common arrangement I have dealt with has involved no physical contact at all between the primary and secondary windings, let alone having them twisted together (which presumably produces all sorts of issues in relation to capacitive coupling) - what sort of RF frequencies are you thinking of?

https://docs.rs-online.com/167e/A700000006829303.pdf

Shows the spec. of a typical LAN isolation unit, typically built into a all network interfaces. The test voltage is 1500volts, which they have to survive successfully for 1 minute. Assuming such a network interface at each end of a LAN cable, that would mean 3000v worth of isolation between the two PC's.
 
Shows the spec. of a typical LAN isolation unit, typically built into a all network interfaces. The test voltage is 1500volts, which they have to survive successfully for 1 minute. Assuming such a network interface at each end of a LAN cable, that would mean 3000v worth of isolation between the two PC's.
That's roughly what I would have expected and, as I've implied, I think that is 'more than enough for me'!

Kind Regards, John
 
But this won't provide the KV's of isolation required for Ethernet use.

This is the point I am trying to make.

Prevention of physical damage by isolation is not the same as prevention of data corruption.

Providing isolation can compromise the prevention of data corruption and at the same time providing prevention of data corruption can compromise the safety isolation.

The better the safety isolation the higher the data error rate in situations where the safety isolation was necessary to protect the hardware.
 
This is the point I am trying to make.

Prevention of physical damage by isolation is not the same as prevention of data corruption.

Providing isolation can compromise the prevention of data corruption and at the same time providing prevention of data corruption can compromise the safety isolation.

The better the safety isolation the higher the data error rate in situations where the safety isolation was necessary to protect the hardware.

I'm really confused as to what point is trying to be made here. I think we have now proven that safety wise there is no issue with two adjacent properties sharing a LAN connection, even if they are on differing phases of mains supply. Data rates will be at full specified speed upto 100m without any special precautions, providing the correct spec of LAN cable is used, besides which some small amount of corruption of data is normal and taken care of by checksums, plus repeated sending of data. The twisted pair design of such cable is intended to reject any local interference along the route of the cable, which is why it is so important to use the proper pairs.
 
That wasn’t my reason. The OP hasn’t said anything for nearly two weeks.

Not sure if he needs anymore input.
 
Had a quick read of vodafones BB terms as an example and the definition of "you" is not restricted. Quite the reverse in fact, so as long as you aren't reselling the service, I can't see an issue. I imagine they are all similar. With regard to Copyright, Designs and Patents Act 1988, there would be minimal mileage in arguing that you were distributing copyrighted material and certainly not beyond the scope of s28A. As simple agreement describing the "terms of use" would cover the contract holder fairly well. In general you can't be criminally accountable for other people criminal action if you weren't a party to it. That would get a bit silly.
 
In general you can't be criminally accountable for other people criminal action if you weren't a party to it. That would get a bit silly.
Whilst that is true, I think the issue that some people were concerned about was that if the internet connection were used for some criminal purpose (particularly things related to 'child porn' etc.), if it were detected it would be on the basis of the IP address of the connection. It could then be a devil of a job, and potentially very distressing in all sorts of ways, to have to try to convince the police that the guilty party was one's neighbour on the end of an ethernet cable, rather than oneself.

Kind Regards, John
 

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