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  1. Inspection 01.jpg

    Inspection 01.jpg

    • spark 68
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  2. inspection 02.jpg

    inspection 02.jpg

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  3. Completion 01.jpg

    Completion 01.jpg

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  4. Completion 02.jpg

    Completion 02.jpg

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  5. spark 68

    Commercial kitchen containment

    The actual type the other spark showed me were slightly different to either the normal distance saddles, or those hospital clamps shown earlier, they had two screw fixings for the wall part and a short piece of solid round bar as the stand off bit with the back half of the clamp, a smaller...
  6. spark 68

    Commercial kitchen containment

    I can vaguely recall something to do with the fixing of the containment, that normal saddles for the conduit were not allowed, they had to be a sort of stand off the wall type for cleaning reasons, I was not involved with that particular job though but another spark was querying a few bits with...
  7. spark 68

    RCBO's on a TT system.

    Here is a snippet taken from an online catalogue, it may also be buried somewhere on the Schneider site (which is a nightmare to find anything lol). I also think the same information was in MK literature. I suppose an upfront TD 100mA RCD may make them suitable as far as the reg concerning...
  8. spark 68

    RCBO's on a TT system.

    A look at some manufacturers data sheets might help, I am sure I read somewhere that SP RCBOs were not suitable for TT use, it was from a major manufacturer if I recall. One possible single phase use for true DP types would be for inside mobile caravans, where supplies from the various sites...
  9. spark 68

    RCBO's on a TT system.

    Further information to post #8 :) If we forget about the RCD part of the RCBO for the moment, which senses E faults or imbalances no matter which device is used as this is inherent to the way RCDs work, only the SPSN and DP types will actually disconnect the N, or second line in some cases, in...
  10. spark 68

    RCBO's on a TT system.

    A SPSN is effectively DP as far as isolation is concerned, but is not the same as a DP RCBO/MCB, as has been pointed out earlier a SPSN has only one overcurrent sensing element in the line side, the N pole is just a linked switch. A true DP device has overcurrent sensing elements in both poles...
  11. spark 68

    Fused connection unit in a toilet block

    As others have already said, toilets without shower/bath is not a special location. The equipment installed is to be suitable for the environment, general rules apply, on a side note not actually a reg in BS7671 but in the electricians guide to the building regs (I think) suggests minimum...
  12. spark 68

    Bonding dilemma

    Might be a better way of phrasing it. I have the popcorn ready ;)
  13. spark 68

    Plastic Water main with copper throughout.

    Re: Plastic Water main with coper throughout. No you shouldn't "just bond" without testing and a proper assessment, you may introduce a hazard where none previously existed.
  14. spark 68

    Plastic Water main with copper throughout.

    Re: Plastic Water main with coper throughout. Pretty much :), that is why I look for the very low reading consistent with the gas bond, or the 23k or above reading. The whole idea is to keep everything inside at the same potential, which is why we bond as near to the incomer as practical.
  15. spark 68

    Plastic Water main with copper throughout.

    Re: Plastic Water main with coper throughout. Okay if we assume the gas pipe is extraneous and is bonded correctly at the correct point at the incomer to mitigate that fact, then how does the water become extraneous just by being earthy to the gas pipe via the boiler which is already bonded ...
  16. spark 68

    Plastic Water main with copper throughout.

    Re: Plastic Water main with coper throughout. I actually thought the R2 reading of 0.9 was from the water pipe just after the stop tap in copper back to the MET :) with the gas bond connected. As per GN3 relates to the 0.05 reading between "points" not necessarily between the clamp and the...
  17. spark 68

    Plastic Water main with copper throughout.

    Re: Plastic Water main with coper throughout. I know, in domestic though you would need a bloody long run to really exceed that my much if it was 10mm, I did say to take into account and check against the tables. And it is between "points" not necessarily the connection between the clamp...
  18. spark 68

    Plastic Water main with copper throughout.

    Re: Plastic Water main with coper throughout. No adverse effects, as in this case it is already effectively bonded via the gas by that reading, apart from the difficulty of routing the MPB that is ;) You could always add it as near as practicable if you feel it needs it.
  19. spark 68

    Plastic Water main with copper throughout.

    Re: Plastic Water main with coper throughout. I would also disconnect the Gas bond at the MET and measure across the gas and water pipes. On normal houses where the incomer is plastic , unless I see evidence of either an outside metallic pipe (garden tap etc.) or an outbuilding with a water...
  20. spark 68

    Plastic Water main with copper throughout.

    Re: Plastic Water main with coper throughout. If the incomer is plastic then it is not introducing an Earth potential from outside at that point, my next move is to see how low the reading actually is back to the met, and if it is around the suggested 0.05 mark as per GN3 I assume it is...

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