confusion

confusion

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  1. R

    Economy 7 confusion

    Hello all, We have just moved into our new place and it is all electric running a economy 7 set up. I have done some looking and it seems I want my off peak switch always on and keep the on peak switch off. My confusion is nothing is marked. I have attached photos of the water heater with the...
  2. B

    Gold card confusion

    Hi, I have read so many things as to what to do next to obtain a gold card that I am confused. I have over 5 years electrical experience, I have 18th edition, 2391-52 and my AM2 and a few other qualifications. I was investigating the Experienced Worker Assessment but as I have an AM2, I am...
  3. Lucien Nunes

    How many phases? And another Lucien grumble: 'Amps Per Phase'

    When I joined this forum a decade or so back, there was a discussion going on about a welder that was connected with a 3-core cable to L1, L2 and earth of a 3-phase supply, operating on the 400V present between L1 and L2. The advantage of choosing 400V is the reduced current requirement. My own...
  4. L

    Confusion with calculating cable runs

    Hi all, just a quick query really. I'm and apprentice on me second year and currently doing my design project and confused about length of run per circuit. I know you can't exceed 30m per circuit but what about lighting? Does this include separate switches? Like can I power one grid switch...
  5. N

    Circuit numbering confusion?

    Just watched this and can't argue with his logic, but I'm yet to see a board numbered in this way... Anyone do this?
  6. S

    GN3 formula confusion...mistake?

    For continuity of ring final conductors it says we can use the r1 to check the expected result for r2, and gives the following formula to use: r2 = (1/ csa of cpc) / (1/ csa of line) x r2 = (csa of line / csa of cpc) x r2. Shouldn't the bold r2's say r1? After all we can't use an unknown to...
  7. H

    Fuse rating confusion

    Organizing my fuse inventory at the plant I came across some Ware 56-50 Amp (FRS style/size). The world of fuses is complicated enough... I cannot find any info on what this seemingly dual rating is. Anyone
  8. B

    NICEIC Certification Scheme NICEIC online form confusion

    I am constantly confused by the online installation form and what they refer to as "main switch", and "installation worked on". If I have the following arrangement, on a TT system: Which is the "main switch / switch fuse /breaker / RCD" referred to in part 8? 100mA RCD, 45A Switch fuse, or...
  9. B

    Building control confusion!!!

    Had a lovely conversation/argument with building control this morning, the scenario is this, Completed job (4 flat rewire) EIC’s sent to client as normal, building control notification done via NICEIC portal, all good (you’d hope) Then received email from client (the architect) to inform me that...
  10. S

    Confusion over right generator for house.

    A customer has a 7kva open frame site generator.The 230v output is floating neutral which would have to be earthed. In an article titled invertor v conventional gennys,it says the site gennys can damage laptops and other electronics in the home,but then goes on to say invertor gennys give a...
  11. T

    Light switch standards confusion. Help?

    I am a bit confused with different systems for light switches across Europe. I see that most of the companies that sell light switches offer both of the two options: A: European/German/multi-part/2-module switches (found all of those names for it) (example image) B: Italian/modular/3-module...
  12. GBDamo

    Three phase Type A RCD confusion.

    Was testing a EV charge point today and noticed the internal RCD was TP device with only a single phase supply and load in use (L1). There was 245V either side of the RCD but the test button didn't function.!! Is it possible the test button is fed from one of the phases that is not used...
  13. J

    Light fitting confusion

    Removed old bc fitting which had 3 reds in one hole, 3 black wires in the hole next to it and green to a third hole which I assume is earth. It looks like earth is connected to the brass of the bayonet fitting (pics attached) Installed new bc fitting from toolstation, keeping reds, blacks and...
  14. S

    Fluorescent lamp rating confusion

    Hi, I was replacing a G24D-3 fluorescent lamp in an outdoor light, and a label on the light fitting stated the lamp type was a 26W G24D-3 lamp, however I noticed the ballast had 18W written on it for the lamp wattage. The lamp fitted was a 26W one, and the replacement I was going to fit is a 26W...
  15. C

    light fixture confusion

    This doesn't make sense to me. Replacing this light for a friend...from the light switch the live romex cable has BOTH neutral and hot connected together, with hot coming from the light fixture to complete. And the neutral from the fixture connected with the ground. I've never swapped something...
  16. A

    UK 13A fuse kitchen grid switch, connection confusion

    Hello, I was about to replace the old tatty 8 gang grid switches in my kitchen with some new Varilight ones. The only problem I have is that the two old 13A fuse modules had 3 connections. There was a live wire going into the top terminal and then a single yellow into one of the bottom ones and...
  17. S

    A simple dI/dt confusion, Anyone like to try & solve it ?

    According to calculation : - 1uH coil is giving me 50A/uS for 100uS, If I use 4uH coil, it will give me 12.5A/uS for 400uS What I am trying to ask specifically is : - Will total time get increased by 4x ? Or It will only take extra 4uS for current to reach 50A, then for the rest of the time -...
  18. S

    Please solve this SCR Current rating confusion!

    If SCR has 9000amps at 50hz non-repetitive current rating. What will be it's non-repetitive current rating for 35uS ?? Or Can we use this SCR for 3600amps / uS for 35uS ?
  19. Dartlec

    EICR Coding Confusion wrt Supplementary Bonding

    Yes, it's another EICR coding question - hurrah! :blush: Inspecting a small 1 bed 70s ex-council flat that was going well. Main Bonding had been put in place in advance and most of the tests were as perfect as you could get. Seriously, if you wanted to set up a 'perfect' test rig I don't...
  20. B

    Hot tub confusion

    Hi, just finished fitting my hot tub and need to run a 45m length or armoured cable from the garage to it. Next to the tub will be a summerhouse with a couple of sockets in it nothing heavy just a phone charger and stereo. The wiring it used to have when I bought the tub was 16mm outer / 4mm...

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