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  1. A

    Zs, Ze how the tester works?

    I understand how to test Ze and Zs and that Zs is the total impedance from the suppliers tranny to the final accessory in a circuit your testing. Also that Ze is the suppliers earth resistance. However i have a few questions 1.) how does the test meter actually work to measure Ze by connecting...
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    Theoretically... cables must be fused down when a lower size cable is connected to a larger sized ca

    The situation i was thinking was if someone wanted a light outside and the house inside is all concrete ceilings and walls etc which do not want to get wrecked. But you had a perfectly good ac unit outside with its dedicated circuit it would be much easier and less hassle to just stab of that...
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    Theoretically... cables must be fused down when a lower size cable is connected to a larger sized ca

    This is exactly why i asked the question, because i always hear people saying in fault conditions but they cant even tell me what fault conditions other then short circuits. thanks
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    Theoretically... cables must be fused down when a lower size cable is connected to a larger sized ca

    @darkwood @Richardburns Thank you both for your in depth explanations. So in conclusion if all Zs values are met it could probably be safe and sound
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    Theoretically... cables must be fused down when a lower size cable is connected to a larger sized ca

    Thank you, that makes sense Thank you, but in the case of a short circuit wouldnt it only effect the 6mm cable in the situation described and not the 1.5mm stabbed of the 6mm. also dont mcbs detect short circuits whether big or small and trip anyway.
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    Theoretically... cables must be fused down when a lower size cable is connected to a larger sized ca

    hahaha, mate i understand why we use fuses. But no one can ever give mean answer other then the one there college tutor gave them oh its because in fault conditions, what fecking fault conditions can cause a 1.5mm cable to melt supplying one light.
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    Theoretically... cables must be fused down when a lower size cable is connected to a larger sized ca

    but what type of fault could cause it too melt?
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    Theoretically... cables must be fused down when a lower size cable is connected to a larger sized ca

    thats perfectly acceptable but for example its just one 100w light the 1.5mm will never get overloaded
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    Theoretically... cables must be fused down when a lower size cable is connected to a larger sized ca

    So what are you implying? All this talk is just theoretical as 'would it work fine'
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    Theoretically... cables must be fused down when a lower size cable is connected to a larger sized ca

    Now I completely understand why cables must be fused down when a lower size cable is connected to a larger sized cable. To ensure the cable does not burn out from current that it cannot take. Yes i know this Now current doesnt go anywhere it isnt in demand for so if a spur off of say a 6mm for...
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    140 V between live and neutral instead of the usual 230 V

    The neutral from the supply either has not been terminated properly/ loose connection therefore in a normal circuit if there is no return then the neutral can potentially become live so as in your situation the neutral has about 90 volts on it potential difference. I had the same problem about...
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    TNCS - USING NEUTRAL AS EARTH IN BOARD

    Thank you for the clear in depth explanation
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    TNCS - USING NEUTRAL AS EARTH IN BOARD

    Thank you to everyone who has taken the time to reply. You have given me a greater insight into the topic
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    TNCS - USING NEUTRAL AS EARTH IN BOARD

    Would still work though in the sense rhat if you were to touch a live conductor it would trip
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    TNCS - USING NEUTRAL AS EARTH IN BOARD

    So the neutral is earthed every third or fourth pylon to keep the resistance down?
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    TNCS - USING NEUTRAL AS EARTH IN BOARD

    Isnt all neutals connected to earth at the very begining anyway?
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    TNCS - USING NEUTRAL AS EARTH IN BOARD

    No thats not what i mean , forgot war and all that. Why is it that a in one house a tncs system here can be connected to neutral but in another house it cant?
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    TNCS - USING NEUTRAL AS EARTH IN BOARD

    But then why is it done in the uk the same problems can happen here????
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    TNCS - USING NEUTRAL AS EARTH IN BOARD

    Why for example is it different i a home where its tns . Theoretically couldnt i just not use the swa sheath as earth and just use a linkbetween live and neutral. I hope you can make some sense of what im saying
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    TNCS - USING NEUTRAL AS EARTH IN BOARD

    You see this is where i cant get me head round it. Because in the uk they have tncs which is just a link , why can it not be done in every uk home. It also has the same risks as anywhere in the world for example loss of neutral.

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