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  1. J

    One for our EV experts

    Fair enough, I didn't know if the T2 was type 2 or part of their references, unrelated to type.
  2. J

    One for our EV experts

    It is a type A - the symbol just below [and to the right of] the type number shows it as type A
  3. J

    Does this install need a rewire as suggested?

    90% of places don't have an installation certificate, some may have had - but now lost, and many others never had them (although as time goes on, fewer and fewer should end up with no certificate). The only point I think is that when the CU was replaced, there should have been a certificate...
  4. J

    Does this install need a rewire as suggested?

    On the basis of the items identified in the report I cannot see how it has been categorised as unsatisfactory. There are only C3s - and not so many anyhow, it would have to have C1s and/or C2s to really be unsatisfactory. Had the offending circuit remained live - then yes it would be...
  5. J

    One for our EV experts

    It does have the MCB to isolate the SPD
  6. J

    One for our EV experts

    Just to add, I don't know if that's a type 1 or 2 SPD, BTW. And going off the original post I thought it was a RCD - so most of the comments relate to RCD, RCBOs usually have the 3kA surge withstand I think.
  7. J

    One for our EV experts

    OK I am going against the flow here, I believe the incoming supply should be to the top N-1 connections, and the outgoing (EVCP) to the bottom N-2 connections. There are two reasons, firstly if the supply comes in from below then the SPD is downstream of the RCD/RCBO, this would be in breach...
  8. J

    LV fault tripping HV ring main unit

    With power transformers, one test done is to short out the secondary, and apply voltage on the primary, increasing it until you get to 100% full load current. If this occurs at 10% of the rated voltage, then the transformer is said to have a "voltage impedance " of 10% This actually means...
  9. J

    LV fault tripping HV ring main unit

    That's my first guess, although it could be CT unbalance - no stabilising resistance fitted, or incorrect setup on the unit protection etc. Basically it depends on the type of protection fitted, smaller transformers though larger ones, may just have: 11kV fuses, or time delay fuses on CTs, or...
  10. J

    LV fault tripping HV ring main unit

    OK. Let's say the transformer is 500kVA and is 5% impedance, then the maximum fault level is flc/5% or 20x Since 500kVA is just over 26A at 11kV, this means any fault on the secondary side cannot result in a fault current more than circ 525A on the primary. So you would normally set the...
  11. J

    LV fault tripping HV ring main unit

    What type of protection is on the rmu? Size of transformer, settings on Protection etc. Could be over reach, but need setting etc to see.
  12. J

    12v Yacht Bow Thruster does not work with Victron BatteryProtect 220A

    As above. Don't forget, at those sort of currents even seemingly low resistances add up to give a significant voltage drop. Even 0.05 ohm - which we would all agree is pretty small gives a 10V drop at 200A. That's why I asked about the voltage at the thruster, when energised the voltage...
  13. J

    12v Yacht Bow Thruster does not work with Victron BatteryProtect 220A

    Basic question, but is it the correct way around? What is the voltage at the thruster when it's energised via the BP? It sounds like there isn't sufficient voltage at the thruster to start up.
  14. J

    Capacitor in AC circuit

    The formula is Xc = 1/(2. pi. f. c) Since in your example 2, pi, and c are constant your result should have the shape ~1/x (actually 1/f) which is exactly what you are getting. This is a constant/smooth change with frequency - double the frequency - half the reactance - the curve does...
  15. J

    UK How do you use a Megger avo to read 4 to 20 milliamp signals

    Plug the leads into com and Amp Select Amps. ** It will auto range, but you can select a particular range using the range button. But the range will be 0 to 600uA, 0 to 6mA etc. If you actually have just 4mA the 0 to 6mA range will be ok, if it's more than 6mA, you would have to select the...
  16. J

    Information on purchasing electronic components

    Never had that. I merely build up an order over the ~ £30 mark, plus the VAT, then they turn up a few days later. The parts have often arrived before stuff from the UK ordered at the same time. Never any additional import duties - that's always been sorted out by them with no interaction from...
  17. J

    Information on purchasing electronic components

    I use RS DigiKey Mouser In about equal measure, I build a shopping list over the free delivery and switch stuff around until I get a balance. Sometimes it's better to pay a few pence extra on some components to get free delivery from one supplier. I have also used LCSC components (partner...
  18. J

    What books / material can I take in to 2391 practical assessment

    So you had to remember every max Zs for every type and rating of every protective device? I never remember having to do that, we were always allowed to look those values up (the current values being in BS7671 OSG & GN3)
  19. J

    UK Drilled into wire in kitchen

    Oops, I guess I should have looked closely! I just took a quick look, and from the previous posts, assumed it was between the switch/fcu and the socket outlet. Yeah, probably not as easy as I first thought. I would still try to pull it through if it looks possible, but a joint is probably...
  20. J

    UK Drilled into wire in kitchen

    Tbh as it's plasterboard, the best, quickest, and easiest would be to pull a new length through using the existing cable and re-terminate each end. No repair to the wall needed then. Cable of that length would be way cheaper than a wago box and joints.

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