[QUOTE=PS1]Seems like the perfectly normal sollution to me too mate!
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Originally Posted by Escapee
There is no dangerous voltage on any customer taps in the CATV cabinet, the highest voltages on coax are for the amplifiers that run from 60V AC (hardly enough to give much of a tickle)
Not completely true.If a customer has a doggy appliance(eg tv with a poor earth) it is possible to get increased voltage "back"through the catv.
Dont take this the wrong way mate,i dont mean to be one of those annoying pedantic people,i just though id point it out.In the majority of cases you are correct.
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Yes, but that could only happen if two possiblilities occured. Firstly the TV set has isolation capacitors to stop any voltage coming out of the TV aerial connector, and secondly the ntl isolation box also has capacitors for exactly the same reason.
If for some reason the TV set had short circuit capacitors, and there was no ntl isolator box it would still be unlikely to cause a problem. This is because the customer Tap in the ntl DP cabinet, that connects the customer have earth bonded chassis, so anything down the outside of the coax would be earthed. These customer taps contain directional couplers that are effectively RF transformers, and any dangerous 50Hz voltages (even the 60V AC line power) would simply see the transformer as almost a short circuit to ground. This transformer would short the voltage to ground until the wire in it failed and it goes open circuit.
The network is fairly safe if maintained correctly, but maintenance has of course a contentious issue for the last five years!