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  1. S

    Best MFT to avoid RCD uplift?

    In the article above, it gives an example of an RCD adding an impedence of 0.5ohms to the circuit. Surely then that is part of the total loop impedance and should be included in the result, rather than being identified and subtracted? Or does it only appear to add that impedance to the test...
  2. S

    Four core or five core for linking outbuildings with 3 phase

    Very true but the scientific principals will be the same so I would imadgine the calculations will be similar, and necessary in some form. Either way local advice is needed as you said above, I just thought it worth mentioning that there is more to it than just earthing incase the OP is not aware.
  3. S

    Four core or five core for linking outbuildings with 3 phase

    In addition to earthing conductors, you also need to consider load requirements and the length of each of these cables to work out what size you need. These calculations could get complex, especially if the power links from building to building, as the load will increase at each building as yiu...
  4. S

    Working in (north) London

    Don't count on not getting towed, I had my car towed by lambeth council once, an hour after it got a ticket (which was at about 0835 when charhing starts at 0830). That was in a pay and display bay.
  5. S

    Unusual Two-Way Wiring

    If you are intending to leave the joint in the ceiling void, it needs to be a maintenance free connection. Wago 773 connetors in a wagobox meet this requirement, there are also other options. Also, the ceiling appears to be artex which could contain asbestos.
  6. S

    Max Demand/Diversity Query

    How long are the submains? I'm assuming it's not a huge building, but worth checking that Volt drop isnt an issue?
  7. S

    where to switch a 12v LED circuit?

    Also make sure the transformer/PSU is located somewhere where it can get some airflow around it, and its not trapped behind the bed.
  8. S

    Certain accents not worth quoting for?

    TL: DR Did the OP actually count the jobs scientificaly, or is he just basing it on his memory
  9. S

    Certain accents not worth quoting for?

    Have you actually logged every (or even most) calls you recieve and quotes you provide, and whether they have the accent you refer to, and if they have led to a sale/job. And then analysed the data to come up with the figures you mention? Or have you just thought back and estimated how many of...
  10. S

    Help needed for buying the right 16a plug please!

    A rack full of amps will have a high start up in rush current from the power supplies in them. Measuring that isnt really something you can do with standard equipmemt as it will last for a few cycles. The way to avoid trips would be to power them on one at a time instead of just plugging the...
  11. S

    Cctv distribution to tvs

    I believe you can now get DVB rf modulators. If all the TVs recieve a freeview signal from one aerial disttobution amp, you shoild be able to feed the modulator in to the amp and the CCTV feed can be picked up as a freeview channel. Edision HDMI Modulator Full HD Distribution over Coax...
  12. S

    Help needed for buying the right 16a plug please!

    They are also often linked to a sound level meter in places where noise outside the venue is an issue. So the PA will shut ofd if its too loud.
  13. S

    Help needed for buying the right 16a plug please!

    I'm assuming the outlet os a 16A single phase socket (standard for this kind of thing). If you are buying a blue (200-250v) 2P + E 6H 16A plug then it should be compatable. They are a standard size for each current rating. With regards to tripping it may be that there is a socket circuit...
  14. S

    10 amp inline connectors

    I would imadgine the advice about not using an extention lead is because there are a lot of them about that arent suitable for 13A. Either because they are on a reel, or a 4way could end up becoming overloaded, or some are just badly made with cheap materials. As mentioned already, if you use a...
  15. S

    Fused Spur For LED TV

    If you are installing a switch at low level I would make that the Fused connection unit and install a flex outlet plate behind the TV to connect the TV cable into.
  16. S

    Dodgy meter move, how to fix?

    Can the meter go back where you think it was next to the service head, with a small switch fuse or similar. You could then run a submain to the CU location and all would be above board.
  17. S

    Floor socket - 2 sets of T&E?

    A Ring final circuit allows 2.5mm cable (which can only carry around 20A in some circumstances) to be used with a 32A MCB on a 32A circuit. This works because every socket has 2 routes back to the MCB (either way around the ring) so the current is divided between the 2. As others have said, if...
  18. S

    How many lights in a burger van......

    I'm guessing not much ceiling height if its in a van. Whats the beam angle on the downlights? They may be too narrow and so causing lots of shaddows in between / when the fixture is behind your head. I would have thought led battens/tubes would be better?
  19. S

    Light fitting trips one RCD, but not if connected to a different RCD

    From the description of what you have tried I cant see how it could be a borrowed neutral. You need to do an RCD test on both RCDs and also an insulation resistance test on the light fitting, and potentially a leakage test on the side that trips. It does sound like a faulty fitting and...
  20. S

    Floor socket - 2 sets of T&E?

    How were the cables before you started? Were the 2 joined together (ie L>L, N>N, E>E). Were they installed in that back box already? As you say it seems likely they are for a floor socket. If they are part of a ring the 2 should have been connected together, and you need to make sure they are...

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