Rob Morley wrote in
(E-Mail Removed):
>> how about ordinary network cable, inside say, a garden hose and
>> sealed at each end to keep the damp off it?
>>
> That doesn't address the potential problem of different earth
> potentials at each end, which could cause problems for anything
> connected to it. Fibre would be the proper solution.
If the remote building is powered from the same supply as the main house and
the mains cable is earthed, won't the earth in the remote building be the
same as in the main house? Why should a 20 yard cable run between buildings
be any worse than a 20 yard cable run within the main house?
Is fibre the best answer? How would the cost of the fibre itself, plus the
Ethernet-to-fibre converters at each end, compare with some form of optical
isolation box at one end - a device with two Ethernet ports but no
electrical connection (only an optical "connection") between them?