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    Sharing a Sky dish with a neighbour

    This is a discussion on Sharing a Sky dish with a neighbour within the Sky & Sky+ TV forums, part of the Other Sky help and support category; Originally Posted by simonmpoulton I agree with smithy on this one, the chance of the AC current going through into ...

    1. #11
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      Re: Sharing a Sky dish with a neighbour

      Quote Originally Posted by simonmpoulton View Post
      I agree with smithy on this one, the chance of the AC current going through into the dish is extremely slim (if at all possible).
      I suggest that you and Proppinupthebar and Smithy99 go off and read how switch-mode power supplies work. For a start, the principal noise suppressor in these systems is a dual-capacitor, connected between live and earth and neutral and earth. This capacitor is rated at 1000V - sufficient for 240V purposes, but not when boxes are connected with the earths between different phases. Switch mode supplies do not have the isolation that the old linear supplies have, and those who are saying that there is no problem should supply their name and address, so the OP knows who to sue when someone in his/her family gets electrocuted.

      Consult an electrician !


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      Re: Sharing a Sky dish with a neighbour

      With all due respect Old_nick, if that were the case, then every single sky homes FSD system that runs from STB powered multiswitches would be unsafe. I don't believe that the manufacturers would allow such unsafe equipment on the market, let alone get "Sky Engineers" to install them safely with earth bonding and such.

    4. #13
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      Re: Sharing a Sky dish with a neighbour

      Quote Originally Posted by Old_nick View Post
      I suggest that you and Proppinupthebar and Smithy99 go off and read how switch-mode power supplies work. For a start, the principal noise suppressor in these systems is a dual-capacitor, connected between live and earth and neutral and earth. This capacitor is rated at 1000V - sufficient for 240V purposes, but not when boxes are connected with the earths between different phases. Switch mode supplies do not have the isolation that the old linear supplies have, and those who are saying that there is no problem should supply their name and address, so the OP knows who to sue when someone in his/her family gets electrocuted.

      Consult an electrician !
      Yep, and keeping knives in kitchens opens you up to the risk of a stab wound.
      Whats that behind you?

      You aren't going to get 220V down the coax if a STB fails. You certainly aren't going to get two STB's failing in the same way with 220V from two different phases arriving at the LNB.
      There is no p in Thomson.

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      Re: Sharing a Sky dish with a neighbour

      Just a quick look at the 17th edition of the IEE wiring regs comes up with, under earthing, and after dealing with gas and water services.

      "Metallic sheaths of telecommunication cables must be bonded, but the consent of the cable owner must be sort before doing so" It then goes on to indicate minimum conductor sizes.
      The idea here is that it is possible under fault conditions for the sheath of the cable to become live and represent a shock hazard within the home, and the home owner may not be awhere of this or be unable to cut off the fault supply.

      The same is true of the screening of the sat cable on a shared system. Once it is connected to the users STB it is possible for the box to become live through a fault elsewhere on the shared system.
      It is for this reason that the screens of shared systems are earthed, so that should a fault develop, it does not represent a shock hazard to other users.
      All this is also true of single dwelling set-ups, but in that case the user has control of the supply and the faulty equipment

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      Re: Sharing a Sky dish with a neighbour

      ...... and how many domestic dishes do you see with bonded earths ? Not many, because they're put in by installers, who are not engineers.

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      Re: Sharing a Sky dish with a neighbour

      Just for clarification: there's no need to earth the dish as it's not connected to anything*. It's the cable screens that need to be earthed in a shared system.

      *Modern LNBs have an insulating plastic housing so there's no electrical connection to the dish.

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      Re: Sharing a Sky dish with a neighbour

      Apologies for resurrecting an old discussion but I would reinforce the point that it is EXTREMELY important to call in an electrician to earth-bond all cables from the LNB. In the event of a wiring fault in either dwelling, the voltage on the equipment could go as high as 450 volts.

      I agree that it's as rare as a lightning strike but, actually, wiring damage through lightning strikes is very common and this is exactly the sort of incident that could create a fault.

      As for multiswitch systems in apartments: they are ALWAYS earth bonded.

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