transformers

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  1. D

    Fire damage after loft insulation installed

    Hi all, went to quote up a rewire on lighting circuit in a bungalow today. It turns out that they had new insulation laid just over 2 weeks ago. The insulators had left room around the light fittings (recessed 12v 50w halogens) but they totally covered up the transformers. After a quick look...
  2. D

    10kva transformers

    how do you do an rcd test on a 10kva transformer
  3. D

    what frequency do 'HFAC' low voltage transformers (like varilight) typically output?

    Hi, I'm replacing low voltage halogen with MR11 and MR16 LED bulbs. AC supply would be simplest because of existing wiring, but I'm concerned about LED flicker: Characterizing and Minimizing LED Flicker - Lighting Solutions | DigiKey I'm looking at varilight transformers: VARILIGHT...
    • danieru
    • Thread
    • flicker frequency low voltage output transformers varilight voltage volts
    • Replies: 4
    • Forum: UK Electrical Forum
  4. J

    School Lab Transformers

    Good evening forum friends. I have recently gone self employed and I am in the process of quoting various school maintenance in the local area. The only thing I have not done in the past is testing lab transformers. CAN SOMEONE PLEASE HELP AS I CAN NOT FIND ANY INFORMATION ONLINE. I believe the...
  5. R

    transformers

    Hi I just installed a 5000va transformer 240 - 110 v and cant see what protection there is on secondary side for short circuit. now i take it that it's a centre tapped safety isolating transformer because in getting half the secondary outlet voltage between line to earth (would it be visual if...
  6. W

    Transformers...

    Hey This may sound like a really stupid question but the jobs 40 miles away and i need to be sure! Basicallyc ustomer has a decorative light fitting with 20 10 Watt g4 capsules lamps, the transformer has packed up and needs replacing , their is just one Pos and Neg at the base of the fitting...
  7. M

    Is there an issue with connecting 2 transformers together?

    Hi all Need to connect my cabinet kitchen lights. Already have the feed from the switch. I have 2 transformers that feed 3 lights each. (They came as part of a package so the transformer is rated to power all 3) Can I simply connect the feed from switch into 1st transformer connector block and...
    • Misshazhard
    • Thread
    • connecting issue together transformers
    • Replies: 3
    • Forum: UK Electrical Forum
  8. F

    LED MR16 on standard transformers and dimmers

    Hi all. Simply put: Looking at changing standard 50w MR16 lamps with 7w Warm white MR16 LED's Existing transformers are Aurora AU-PD60 20-60W/VA Electronic Transformer Existing Light switches are Lutron Rania single channel (non LED compatible) Have any of you had past experiences running MR16...
    • firespark
    • Thread
    • dimmer dimmers led mr16 standard transformers
    • Replies: 2
    • Forum: UK Electrical Forum
  9. R

    Testing Transformers

    Hi, Could anyone give me some advice on methods of testing 12v transformers if at all possible? Why I ask is because been to a customers because one of the under cabinet 12v lights wasn't working. First I tried changing the lamp which didn't work but worked in another fitting. Then just assumed...
  10. M

    Temperature Indicators on Transformers

    Hey Everyone, Suppose we say the 'Temperature for Alarm is at 90 Degrees C' and the 'Winding Temperature Alarm is at 103 Degrees' on Transformers, At what point of the transformer are we actually getting these readings from. I see RTD's connected to the top of the main tank from the outside...
    • Mustafa Mohd.
    • Thread
    • temperature transformers
    • Replies: 0
    • Forum: UK Electrical Forum
  11. T

    High power 12v leds

    Hi guys, Im changing some down lights in a hairdressers with high ceilings and need some high power directional (38degree or thereabouts) 12v leds. Preferably ones that will work with the existing transformers but i no thats hit and miss depending on what transformers they have already. Ive...
  12. M

    Ceramic / Electrical Bushings For Transformers

    Good Day to Everyone, I have a doubt that google has not been very helpful because I do not know the 'right terms' to be googling for. Ceramic Bushings that are used for transformers have a structure similiar to the ones shown here (Openelectrical.org) I noticed all ceramic bushings have...
    • Mustafa Mohd.
    • Thread
    • ceramic electric electrical transformers
    • Replies: 17
    • Forum: UK Electrical Forum
  13. N

    LED Driver

    I have recently bought a reel of SMD LED strip lighting. I know it's suggested that you use an LED driver to power these but they seem very expensive. I was wandering if I could use a standard electronic transformer used for powering LV spotlights, as long as I meet the minimum load? I struggle...
  14. C

    Buzzung dimmer

    had a look round a friends where there's x8 12v down-lights witch all have individual 20-60va dimmable electronic transformers, these lights are switched by a 400w GET dimmer switch which buzz's quite loudly when they are dimmed but works fine if the switch is fully on you can also hear some...
  15. M

    110v transformers

    again would sincerely appreciate a bitof help have a client who wants a mix of stuff doing all in small numbers not really my normal work but have splashed out on a seward 250 to accomadate him and having a few issues on a coulpe of things namely 110 v transformers could some one please...
  16. R

    led lighting interferance

    Hi All Has any one else had this issue, ive recently replaced some 12V down lights for LED lamps and supplier confirmed the existing transformers were ok, anyway since fitting if they turn the lights on the radios will go off any were in the house and it does not matter what station they listen...
    • rossi46
    • Thread
    • dimmer issue lamps led lighting transformers
    • Replies: 4
    • Forum: UK Electrical Forum
  17. G

    RCD's not tripping with TL transformers

    HI all, getting some info though that there is problems with Transformer less Inverters and RCD's not tripping. thought id check one of mine and low and behold it didnt trip. It is the first time ive tested it with the PV on though so i would never normally pick it up. Looks like the the...
  18. I

    Insulation resistance low voltage lighting

    I have recently qualified and am coming towards testing a re-wire. I have fitted 30 low voltage downlighters with transformers. Apart from removing the bulbs do I need to do anything else before pumping 500volts through the circuits. ie will 500volts damage the transformers or are they removed...
  19. D

    How to power low resistance step up transformers?!

    Hello everyone, so i'm trying to build a 12V to 240V power inverter with a 2 Transistors a tenter tapped step up Transformer and a Microcontroller (arduino) that makes a Modefied Sine wave right now for testing but i want to try to make a pure sine wave or as pure sine wave as possible :)...
    • delphino
    • Thread
    • power resistance transformers
    • Replies: 1
    • Forum: UK Electrical Forum
  20. jason121

    Dno

    Had a few drinks last night with a mate from DNO high upin the ranks, let slip that DNO don’t want PV installed that’s why they takethe full 65 days for applications. Too much work for them altering network and processing paper work

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