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  1. Gary Tollison

    Earth fault loop impedance - textbook values vs BS7671

    Hello. I'm in the final stages of completing my electrician course, and I find myself confused (again) by EFLI. In the textbook provided is this: Uo 230V see below for each circuit. Calculate the maximum Zs for each circuit: Complete the table. The answers given in the textbook are said to...
  2. Gary Tollison

    Power cables and hot water pipes.

    There you go.
  3. Gary Tollison

    Power cables and hot water pipes.

    Hello :) Just been doing some investigations into running power from the CU in the house out to my shed. I lifted the floorboards on the upstairs landing and found that power cables have been laid right next to the central heating water pipes. This can’t be safe, surely?
  4. Gary Tollison

    Conduit through brick wall

    Thanks for the input :) SWA through the brick to outside, just silicone sealer around it?
  5. Gary Tollison

    Conduit through brick wall

    hello. Dejavu for some folk, but here’s the scenario: My house is two-storey brick, my shed is 10’x3’ (odd size I know, but the back yard is small) made entirely of wood, no metal at all. The gap between the house wall and shed is 300-400mm. At present there is no power to the shed, so I have...
  6. Gary Tollison

    Lighting circuits and possible cross-over

    Pete, I did say that if I did need help I would let you know. But I managed to sort the issue out myself, and I did thank you for the offer. I do apologise if I have offended you in any way.
  7. Gary Tollison

    Lighting circuits and possible cross-over

    Westward, you are the winner of a nice, brand new shiny toaster! The issue was indeed cross-over. I checked the switch again, (after safe isolation and testing) and discovered I had somehow managed to get two wires swapped. So, after rectifying my goof, (and more testing), all is working well...
  8. Gary Tollison

    Lighting circuits and possible cross-over

    Lol the wooden spoon wasn’t considered, but it might be now! Murdoch, no it isn’t the switch I was asking about morning. Still haven’t done that yet
  9. Gary Tollison

    Lighting circuits and possible cross-over

    Oops sorry for the lack of reply! I’ll let you know if I do need help :) thank you for the offer!
  10. Gary Tollison

    Lighting circuits and possible cross-over

    There is no tripping issue, as neither CB’s have tripped at all. It’s only when either one CB is off and the other is on. So Westward wins the toaster Will keep you updated...
  11. Gary Tollison

    Lighting circuits and possible cross-over

    Yes
  12. Gary Tollison

    Lighting circuits and possible cross-over

    Yes. When either CB is off, the lights they only function as mentioned above.
  13. Gary Tollison

    Lighting circuits and possible cross-over

    However, with both 1 & 2 circuits energised, they behave normally
  14. Gary Tollison

    Lighting circuits and possible cross-over

    Am in Peterborough. I’m not sure how long it’s been like this, I only discovered it recently by chance when I changed a lightswitch like for like. And yes I got the wires in the correct holes :)
  15. Gary Tollison

    Lighting circuits and possible cross-over

    Hello. I have a possible issue with the lighting circuits in my house. There are two lighting CCTs: Dropbox - 01.JPG - https://www.dropbox.com/s/ike2aygjja64pfm/01.JPG?dl=0 1 LIGHTS supplies: Lounge Kitchen Downstairs toilet 2 LIGHTS spplies: Hall Upstairs landing Upstairs bedroom Upstairs...
  16. Gary Tollison

    Domestic lighting in conduit

    Thanks for the info :) Conduit it shall be!
  17. Gary Tollison

    Domestic lighting in conduit

    Hello I want to move a lightswitch down the wall in my kitchen to the minimum 1.2m above the floor. On inspection, I discovered the existing wiring not in conduit, but rather having been plastered/mortared over. The house wiring is pre-2006, but the extension to the lighting is harmonised...
  18. Gary Tollison

    Resistivity equations

  19. resistivity.jpg

    resistivity.jpg

    • Gary Tollison
    • Media item
    • Comments: 0
    • Category: Electrical Videos
  20. Gary Tollison

    Resistivity equations

    thanks for the reply. I know how to get the resistivity with a known CSA, my problem is I cant work out how to calculate the CSA of the cable, when the CSA is unknown.

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