> What if you pull the cat5 through the same underground duct that > currently has your telco's twisted copper in it? Then you run a risk identical to that of your phone. Actually, it's lower because your telco copper is also connected on the other side down the road. > On our 10 acre block we currently have a trench going from the house > to a shed about 160m away. About a meter deep is has a water main. > The trench is now filled to about 1/2 a meter deep. > > Could cat5 comms be safely laid from the house to the shed (not that > there's any need for a computer in the shed). Yes[1]. Especially if you put the CAT5 *into* the ground water. Think about that earthing!! > In other words: Does burying the cat5 cable remove the dangers discussed in > this thread? No. Burying in general should reduce the risk as the earthing is better, and direct lightning has a better path to the ground, i.e. doesn't need to follow the cable for so long, but it depends on specifics. It all boils down to exactly where the lightning hits, and the resistance of everything within reach from there, complicated by the fact that the "circuit" changes because isolation which is there at 2kV won't be there at 2MV (and a few other things like this). In any case it's impossible to prevent a computer (or a few) getting fried, but the people should be safe. Volker 1) A plane could crash on your head tomorrow. -- Volker Kuhlmann is possibly list0570 with the domain in header http://volker.dnsalias.net/ Please do not CC list postings to me. ------------------------------------------------------------------- To remove yourself from this list, email nzlug-request@linux.net.nz with "unsubscribe" in the body of the message.
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