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  1. D

    how determine load wire on AC line

    Hi, Just bought a house (in Sweden, so 240V) and am trying to figure out what's going on with the wiring, as it seems a little strange. I have typically have two black wires coming out of my wall, and one green(earth). I would assume that one black wire is load, the other black is neutral, and...
  2. M

    Load calc for 3 phase supply??????

    Hi all, i need the calculation applied to work out the current per phase for a 3 phase circuit. Found a 9.1 kwatt heater on a 25A triple pole mcb (60898), so on single phase load divide by volts = amps, but this is not the case for 3 phase, any help much appreciated????? Oh i found the heater...
  3. N

    Square D Load Centre RCBO ????

    Could somebody confirm that the RCBO that fit a Square D Load Centre is the QOE? Thank you all!
  4. D

    Split Load CU

    I was discussing the wiring of split load twin RCD consumer units with a friend last night. I wire them with the largest MCB amps next to the RCD (first feed) then decreasing down to the smallest eg. 6 amps. He disagreed and said it should be the other way, smallest first. I tried to...
  5. V

    voltage Optimiser - A Load Of Bull?!?!

    Hi Guys, Just reading through my spam and got an email for a voltage optimiser - claiming to save you money by reducing the voltage!!! MyPlanet Voltis Voltage Optimiser To me this is bull, if something need 1kW to work then it will consume 1kW..no? My Math example: At 240 volts: 1000watt...
  6. R

    My current course provider is a load of ****

    Hi guys I hate my current course provider! They have completley mis sold me a course and ripped me off big time! I may even have to take legal action if i dont get some answers quickly
  7. W

    load question

    hi guys am trying to work out a question with no luck. if i have a single phase load say30 kva how do i work out the load per phase if i was to split the load over a phases.
  8. S

    wall mounted system - wind load calcs

    We have just been to quote for a job :party:where the customer wants a wall mounted system. I have no issue with this but it got me thinking about the wind load calculations - everything I have read is to do with Roof-Mounted systems. Can anyone advise whether they will be required for wall...
  9. W

    Hager metal clad enclosures - what a load of pants

    Just bought a 2-way hager metalclad enclosure, and 2 rcbos to fit, but the buggers wont fit in the enclosure as the DIN rail has been mounted too high. Anyone else had any experience of this? Im going to drill out the rivets on the DIN rail and drop it half an inch and re rivet it, but what a...
  10. Top Cat

    6 Amp RCBO 13 Amp load

    Doing a rewire at the moment in an empty house. I am using RCBO's mostly so when i got 1 room complete i wired the 4mm radial into the RCBO so we could get the kettle going. After several brews i went to disconnect it only to find i had wired it into a 6 Amp RCBO! The trip never operated once...
  11. M

    Total load + diversity

    Is there any diversity re overnight circuits when calculating total load. I can see that for shift workers it could be possible to have a shower whilst someone is cooking a roast whilst the storage heaters are demanding juice but.....
  12. B

    Operating load contactor with relay on SMA TL models?

    How on earth do I configure the TL inverters to utilise the relay inside the housing on the SMA TL (most TL models). I want to use a contactor in the CU to dump the power to a resistive load of a water heating element or a room heater? I believe this can be done via Sunny Explorer and Bluetooth...
  13. Amp David

    Volt Drop calcs max load help.

    Looking at a job at the minute which is only for 3 IP rated double sockets down a garden. Problem is the garden is almost 35 meters long, then its another 21 meters from switch fuse in the house. Anyway, what I need to double check is when choosing cable sizes for my runs, what is best to...
  14. B

    Distribution of load on a ring final for Voltage drop calcs?

    Just pondering my voltage drop calcs for a fused spur off a ring final. Additional circuit will be around 15-20m long so I though I should do this properly.... My problem is calculating the voltage drop in the existing ring to the point of the spur which of course depends on distribution of...
  15. J

    Kitchen circuits diversity - load splitting

    What design loading should be assumed for a kitchen. Washers/Dryers are easier to consider, but someone may decide to boil the kettle, whilst making toast, and putting on a combination oven/microwave at the same time, so should a lower diversity be applied to kitchen circuit than standard. I...
  16. B

    Wind Load Calcs

    Has anyone out there got a simple spreadsheet to calculate wind loads on PV and ST panels. MCS are picking up on this more and more and I'm struggling to find something suitable.
  17. ackbarthestar

    What a load of rubbish

    I installed some Robus fire rated downlights in a customers bathroom about 5 years ago. I get a call from her to say one of the fittings exploded. I thought at this point I'd better go round and have a look and sure enough the metal surround had fallen out and smashed on the floor after the...
  18. T

    RCD Tripping, Nothing in Sockets, no load... what now?

    Hi Everybody, We just moved into a detached house in last friday, only to find that the RCD keeps tripping for no reason :S I have had an electrician out who checked the RCD and said the box is fine.. and must be the sockets. We unplugged every item in the house and tried to turn the socket...
  19. A

    Abnormal sound from no load transformer

    Hi All, I face a strange problem in the converter transformers connected to 11 KV sub station. There is abnormal variation in humming sound of the Transformer 11KV/520 V, 2.25 KVA Dd0 feeding to converter/ inverter drive for rolling mill stand motors. Another transformer 11KV/520V, 4.5 KVA...
  20. F

    IR Testing lighting cct with fixed bathroom extractor load

    Domestic CU change, TN-C-S. Lighting circuit has an Extractor Fan with Electronic timer installed. When performing IR test on the lighting, should i just test the whole lighting cct between L & N (connected together) and the CPC - I do not want to remove the cover of the extractor to disconnect...

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