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  1. S

    Smart Meter Installtion Programme - Opportunty to fit Supplier isolators to all homes

    Re: Smart Meter Installtion Programme - Opportunty to fit Supplier isolators to all h Wouldn't they be live? Until you pulled the fuse.
  2. S

    Smart Meter Installtion Programme - Opportunty to fit Supplier isolators to all homes

    I have read several forums threads regarding the dilemma faced by electricians over the pulling of the suppliers protective device. I have read threads where electricians have been put into awkward situations where the only way to rectify an unsafe situation immediately would be to cut the...
  3. S

    Touring Caravan Inspection and Testing

    Any tips and advice for inspecting and testing a small touring caravan would be much appreciated (over and above that required for a domestic dwelling). It has: 12V Igniter for gas water heater, igniter for gas cooker, igniter for gas fridge (burning gas to keep a fridge cold (what's that all...
  4. S

    Fused Spur off Cooker Circuit

    Yes. Still connected.
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    Fused Spur off Cooker Circuit

    Got it. Nice one. Thanks.
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    Fused Spur off Cooker Circuit

    Thanks - Where did the 3m come from.
  7. S

    Fused Spur off Cooker Circuit

    I have a Cooker circuit on 4mm T&E using a 32A MCB. I have established that my dining room 3 double socket outlets is wired as a radial spur directly off the cooker circuit using 2.5mm T&E (I didn't do it). I assume this is not acceptable but I was wondering; if I add a 13A fused spur for the...
  8. S

    Supplementary Equipotential Bonding

    OK got it. I'm off to Screwfix for an RCd.
  9. S

    Supplementary Equipotential Bonding

    Thanks for this reply and your previous one which was most informative. I now have a much better understanding. Maybe I have not articulated myself very well throughout this thread but it is 415.2.2 (using R</ 50 V/Ia to determine the effectiveness of SEB) that is causing me all the confusion...
  10. S

    Supplementary Equipotential Bonding

    Yes - so from the red text above I need to add supp bonding if my Zs is exceeding 1.67ohms (no RCD). But if I can't touch anything on the lighting circuit simultaneously with extran parts why use Ia of the lighting circuit. If the earth fault was introduced, lets say by an immersion heater...
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    Supplementary Equipotential Bonding

    Yes I agree. An earth fault can give rise to PD between extraneous conductive parts. What is confusing me is 415.2.2 which explains how you determine the effectiveness of Supp Bonding between Extran parts and the calculation is based on Ia which is the current of the overcurrent protection...
  12. S

    Supplementary Equipotential Bonding

    OK. Interesting stuff. But what is the answers to my question/s?
  13. S

    Supplementary Equipotential Bonding

    OK. Bear with me. I am just tring to learn. So the lighting circuit in the bathroom is not relevant yeah? Because one of the the extraneous conductive parts could have become live due to a fault anywhere in the property? As I say bear with me.
  14. S

    Supplementary Equipotential Bonding

    Sorry about the duplicate thread. I have looked at 701. I just can't see the value in SEB if I can't touch exposed conductive parts.
  15. S

    Supplementary Equipotential Bonding

    Thanks Tony. So, to confirm. I need SEB even if I cannot simultaneously touch an exposed conductive part and an extraneous conductive part? In my situation I can only simultaneoulsy touch 2 extraneous condcutive parts.
  16. S

    Supplementary Equipotential Bonding

    Tony - Thanks for the reply. So this is irrespective of the fact that I cannot simultaneosly touch exposed conductive parts and extraneous conductive parts? Only 2 extraneous conductive parts?
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    Supplementary Equipotential Bonding

    Thanks Tel. Thought I may be getting mixed up between different formula. And sorry about the overlap of replies earlier. I am happy with all the formula now and whichever one I use it points at the need for SEB (when there is no RCD); but if there are no simultaneously accessible exposed...
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    Supplementary Equipotential Bonding

    Oh, me getting even more confused now, me thought that nominal voltage (230 in a domestic) was refered to as Uo for calcs in the regs. So whats the 50V ac bit mean then in 415.2.2? Also there are a lot of references to the magical figure of 1667 ohms on the forum which I thought came from...
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    Supplementary Equipotential Bonding

    It's my own house. I'm just trying to understand the Regs. In order to determine the effectiveness of supplementary equipotential bonding 415.2.2 tells you to use the formula R</ 50 V/Ia (where Ia for an RCD is the tripping current (hence the 0.3 in the first calc (1667 ohms)). But if you...
  20. S

    Supplementary Equipotential Bonding

    Thanks Jabbajaws. Happy with that but the bathroom has no RCD.

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