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  1. P

    RCD trips every morning between 08.00 and 09.00

    I live in rural Italy. You get to chose your max KW here and pay accordingly. Most home have 1.5-3.0 kw, I pay extra for 5kw. I am at the end of the low voltage lines, one of only a few on this circuit. I constantly have voltage problems, according to my fluke multimeter it can go from 190v to...
  2. Litoral

    Video and simple comparison between the shortest and longest day of the year

    To explain easily the difference in power generation from winter to summer. Might be useful, I hope it helps
  3. rolyberkin

    Joint between 16mm &1.5mm!

    A donut of a builder has helpfully run a piece of swa two core 16mm to a small feature fountain fitted with 1.5mm flex, suggestions on best way to join, couldn’t get the 16mm in a wago!
  4. A

    difference between zi no trip and zi trip

    hi everyone, i have just got the fluke 1664fc can somone please tell me the difference between a zi no trip test and a zi trip test. i know that it in zi trip it is a high current test but still i can not understand why im getting different readings between live and earth. Thanks
  5. K

    Consumer Units? Is there any difference between manufacturers

    Hi All So I am going to be looking at upgrading to a new a consumer unit in the next few months and I would like to know whether there is such a thing as premium units and budget units because the prices I've looked certainly indicate this to be the case. If so are there actually any...
  6. R

    Joining wall between 2 flats, sockets and fire prevention

    On site today and heard the carpenter tell the site manager that all the sockets and switches on the joining wall (flat opposite side) will need to have fire prevention boxes built aroud them. The site manager is having trimber supports added for the sockets and told him there is fire...
  7. M

    12v between live and earth and 12v between live and neutral

    New to this so be kind. Run a new circuit in today gone to do R1+R2 on the circuit me at the end of line and the other spark putting the link in at DB. Tester starts bleeping voltage so at first I thought he’d turned the circuit on but he hadn’t. On further investigation I’ve found that from the...
  8. M

    What is the difference between 6944x and 6943x

    Apart from price what is the difference between the above cables
  9. Baddegg

    TT or not TT................

    so in between stressing about the connection between KA and zs readings (thanks mattja) I’ve been to meet a customer who wants a pub built in his back garden (yep), tncs supply, will be no extraneous parts at all to the “pub” all plastic water and waste,incoming water is tee’d from mains which...
  10. N

    Fuse between batteries

    Hi all I’m in the process of upgrading my solar set up to 2x 260w panels with a 40a mppt tracer I’ve just bought a 2000w(4000w peak) inverter which will be running off my 2 120ah leisure batteries connected in parallel using 70mm2 cable fused at 350a But my question should the fuse between the...
  11. R

    Coordination between conductor and oveload devices

    A good memory trick for exam conditions for coordination Ib In Iz (Alphabet) the earlier letters are always lower in value than the earlier ones, saves remembering Ib < In In < Iz Ib < Iz
  12. T

    Voltage between live and earth

    I've finished rewiring the upstairs in our house (in Bulgaria). This is 3 bedrooms and the living room on separate ring mains. I bought an earth rod and put that in the yard and as I was connecting up the earths, I decided to check if there were any voltages between various points. With the...
  13. R

    How do you measure 3 Phase Supply confirming it is correct as in 400V between phases etc.

    I have my AM2 exam and the question I have is how would you confirm supply polarity? Would you do the following tests:- L1-L2 L1-L3 L2-L3 L1-N L2 - N L3-N L1-E L2- E L3-E doing this you should expect 400V reading? Finally, test Neutral to Earth and expect to be 0 volts. Would the main...
  14. jaydub

    100A DP Isolator Installation Between Meter and CU

    Hi guys, When installing a new CU does anyone ever install a 100A double pole isolator switch between the meter and the consumer unit? Very often I come across 16mm tails which need to be upgraded to 25mm so I join the old tails to new in a Henley block and get the DNO to come and upgrade...
  15. Gavin John Hyde

    Parallel earth path between 2 circuits

    I have a ring circuit (circuit 1) and a light circuit (circuit2) in a flat im working on and i have somewhere in the walls or ceiling a joined earth path. From what i have seen there is no obvious metal conduit, so it seems its either the ventilation system that is fed by the same ring and goes...
  16. K

    Cables run in cavity between block and brick of an internal wall

    Hello, I'm currently in the process of building a side extension. I will be putting in 2 new rings and 2 new lighting circuits. To get them from the CU to the extension I wanted to run them in the cavity of the old external wall (now internal because there is an extension on the other side)...
  17. B

    Looking for work between training??

    Hi I’m currently doing my city and guilds 2365 course level 2 and 3 and looking for some work as an electricians mate on my 2 weeks off from the course to gain some experience. I have nearly completed my level 2 and start the level 3 in 4 weeks. I’ve got my own van and basic hand tools I live in...
  18. einstein

    The difference between a registered scheme & standard bs7671 condition report

    Whats the merit between a niceic/napit/elecsa certificate vs a standard bs7671 certificate (available online) for a condition/periodic report? Why join a scheme when its not statutory?
  19. HappyHippyDad

    50-70v between L-N on a ring?

    A customer asked me to replace 2 sockets in her house as she said they had stopped working. When I tested both sockets one was a spur and the other a spur off that spur. They both had 240v L-E and 50-70v L-N. The MFT tester showed 70v and the fluke showed 50v. I wish I'd put the Drummond on to...
  20. A

    Maximum distance between collectors and tank?

    Hi, I'm looking at installing a solar water system for a friend. He runs a B&B so has much higher hot water needs during the summer, and also a very high annual bill for heating and water. So it seems like he's ideally suited for a solar thermal system to at least reduce the costs. We live in...

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