LED light installation

Discussion in 'Electrics UK' started by daveaspy, 31 Aug 2021.

  1. daveaspy

    daveaspy

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    I've installed some LED strips on a ceiling but power supply is currently in the "prototype stage" in the eaves above that room and just looking for any advice on the best permanent solution.

    The controller is 5V very low power USB connection, it controls a relay that turns on the power to a 200W power supply for the strips as shown in the diagram (5V is actually fed in to the strips at several points to overcome voltage drop and the demands on the strip power rails, and the 0V of the DC supplies are connected)

    lights_power.png

    I'm wondering if adding the single socket in the eaves to a very convenient ring main location is acceptable? The power supply could plug into the socket and the controller into the built in USB - seems the simplest solution.

    Alternatively I could add a fused FCU with flex outlet into the ring and connect the power supply straight into that, and also add a socket for the USB connection.
     
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  3. AndyPRK

    AndyPRK

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    Surly there is a lighting circuit in the roof ?
     
  4. daveaspy

    daveaspy

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    I can probably find one, its just quite close to a wall socket in the dormer which would be handy, and I was also a bit unsure about connecting a USB supply/adapter onto the lighting circuit as I'm sure I cant just add a 13A socket?
     
  5. BS3036

    BS3036

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    Here we go... There is no reason not to do this if the circumstances make it a useful approach. The regulation book BS7671 specifically allows it. The only thing it to make sure it doesn't cause an issue later on and the best way, in my opinion, to do this is to stick a label on the socket explaining what it's for and saying not to use for anything else. There is a pedant on this forum who will jump in and say it is bad practice. Feel free to ignore him.
     
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  6. daveaspy

    daveaspy

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    I've been having a read through some other threads and yeah it seems a labelled socket on the lighting cct would be ok. I'll have a root around if its preferable to connect to the lighting cct - its a bit more of a wriggle through the eaves storage areas to get to the lighting circuits whereas there is a socket right next to the access door.

    if the lighting circuit is too much of struggle, is there anything actually wrong with wiring into the ring main, given suitable fusing? This is additional lighting rather than "the big light" :D
     
  7. EFLImpudence

    EFLImpudence

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    It doesn't matter which circuit you use.
     
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  8. boringoldcodger

    boringoldcodger

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    The usual advice on here is that it's perfectly alright to add a socket onto a (pedantically) ring final as long as you are sure it IS a ring final and that the circuit is protected by an RCD (all new sockets must be RCD protected).

    edit: EFLI beat me to it.
     
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  9. flameport

    flameport

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    Probably too late, but running high powered LED strips at 5V is rather insane. 24V strips would have been a far better choice as the current involved and volt drop would have been significantly less. As it is, you have 40 amps from that power supply which will require 6mm² cables.

    The USB adaptor can be connected to any conveniently located circuit.
     
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  11. daveaspy

    daveaspy

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    yes I am aware of that, but when I was looking there didn't seem to be anything reasonably priced at the higher voltage for individually addressable LEDS. What I have ended up with is 4 feeds from the power supply to points along the strip in 1.5mm² cable. In reality, it is never going to draw anywhere near 40A unless its at full brightness white which isn't the intention. The colours will be more subdued or funky effects going on which dont drive them all full white at once.
     
  12. winston1

    winston1

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    Putting a 13 amp socket on the lighting circuit IS BAD PRACTICE. The reason is someone could clearly plug a 13 amp load into it and plunge the house into darkness even if it is labelled. In a loft this could be particularly dangerous. Just because the (non statuary) regs allow it does not make it OK. The regs have been wrong before and subsequently changed.

    Nothing wrong with taking it from the ring with suitable fusing.
     
  13. Taylortwocities

    Taylortwocities

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    Dont start all this again Winston. At least say that in your opinion
    If it were so dangerous and bad practice it would not be allowed by BS7671. As correctly stated above:
    It is not wrong, it is you who is wrong by riding this particular hobby horse of yours over the @daveaspy topic.

    For heavens sake, be helpful, or shut up.
     
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  14. winston1

    winston1

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  15. BS3036

    BS3036

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  16. bernardgreen

    bernardgreen

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    The problem is that newcomers to the forum seeking advice do not know that Winston1's opinions are his opinion and not factual and thus will not have him on immediate "Ignore"
     
  17. BS3036

    BS3036

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    I agree. It was just a light-hearted gesture born out of desperation.
     
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