transformer

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  1. C

    Ohm value of transformer

    For those of you who work with onsite MV-LV transformers, does anyone know the line to earth ohm value of a transformer? I'd like to include that in the loop impedance path. Similarly when stepping down LV to LV. View: https://Upload the image directly to the thread.com/a/PIsy0nt View: https://Upload the image directly to the thread.com/JwUM0fv
  2. M

    UK Question for Experts - Step up / Step down transformer?

    Hi everybody, I am writing to ask your expert opinion. I bought online a disc repairing device (JFJ easy pro) to be used on my music cd collection. Unfortunately I made a mistake and didn't notice it was a US version (110 v) and it came with a US 3-pin plug as well. I live in the UK and I notice...
  3. J

    Transformer question

    Hello, I wonder if somebody could help me to work out the transformer wattage I need for an American rotary tool I bought? I’m looking to buy a transformer to be able to use the tool in my UK house socket and don’t want to fry the tool on first use! The tool is 120v (60HZ) and 1 amp- am I...
  4. L

    UK RCBO intermittent tripping advise??

    Hi Guys Just installed a RCBO board to replace an old Wylex consumer unit that had Bs60898 MCB's fitted and an RCD main switch customer supposedly hadn't had problems in the past (not quite sure thats now true) when I carried out the EICR I found a problem on the outside garden lights, so...
    • leebut
    • Thread
    • advise anyone intermittent new old problems rcbo transformer tripping
    • Replies: 36
    • Forum: UK Electrical Forum
  5. R

    Control Transformer Question

    Hello everyone... I am installing a 12vdc tachometer on a industrial mixer. There is 480v 3ph motor starter with disconnect box near the machine with a 480v to 120v control power transformer in it. I was going to wire a typical plug in style 12vdc power supply to this 120v supply, but it didn't...
  6. D

    Replacing 2 Wire Doorbell Transformer W/ 3 Wire... Questions.

    Hello, I had a 2 wire doorbell transformer that I needed to upgrade in order for my Ring Pro to work correctly. The old transformer had 2 black wires and one was connected to a black wire and the other was connected to a bare copper wire. The new transformer has 3 wires (black, white and...
  7. M

    Step Down Transformer from Receptacle - Expected Results?

    Hello, I have a 125/250v - 50amp twistlock receptacle in a 3phase building (so, 208v between hots). It's a 4-wire receptacle. Currently, when needed, I split the phases/hots to attain two lines of 120v, each capable of 50amp current. If I installed a knock down transformer (208->120) into the...
  8. N

    Ring Pro Transformer in CU

    I currently have a Ring transformer wired up and working. The original door bell had its on transformer that was next to the CU and the wiring was used from that for the Ring setup. I would really like to get rid of the additional box, as its in my hallway and i already have the CU, house alarm...
  9. M

    Carrol & Meynell isolation transformer

    This is for lab use where I need a transformer with a known level insulation and appropriately tested. I have now sent 3 messages to: Carroll & Meynell - Transformers for industry - Isolation Transformer, 230/230V, 3kVA - CM3000/230 -...
  10. M

    delta transfomer current

    Hi All, anybody know the formula to find current on delta transformer?
  11. A

    transformer inductance

    Hi I tried to simulate the smps fly back conv. in "Psim" app but i didn't understand what's the difference between Lm (magnetizing) and Lp(leakage) , and for that , i got a very inefficient results .
  12. I

    Lost transformer for Christmas lights and need help finding a replacement. Thanks :-)

    Hi I'm not an electrician and have no idea when it comes to electrics. I have some Christmas lights at home and have lost their transformer. Here is the information on the wire: lamp type max 6w (334 x 3v/0.048w) transformer: input 220-240v- 50-60Hz Output:24 Vdc 6VA They are the ones that...
    • ian_bonus
    • Thread
    • christmas christmas lights finding lights need help replacement transformer
    • Replies: 4
    • Forum: UK Electrical Forum
  13. M

    Transformer from a Xpelair heat recover unit

    Hi all So my Xpelair Xcell 150 heat recovery unit stopped working on the slow speed. I've taken it to bits and it looks like the transformer has gone, but it's an odd beast. It looks like a normal multi tap but I can't work out how the primary and secondary coils work, the only transformer I...
  14. S

    Nest voltage question on Transformer

    Hello all, I'm in the UK and I'm looking to fit a 'Hello Nest' Doorbell. In the setup instructions it includes the attached screen shot (nest-screenshot.png), asking what the Voltage and Power rating are on your transformer. My current doorbell is mains powered, (see other attached file...
  15. S

    LED Transformer

    I have 2 separate LED Strips as pelmet lighting in the kitchen. One is about 50w the other 25w. I have a 100w transformer which came with no instruction. It has 2 outputs on the 12v side. See picture. Do I use one of these outputs for each of the strip lights. Or do I use just one of the...
  16. A

    Self Lm of transformer

    Hi. What is the range of self induction (magnetizing) of ferrite trans, specially the smps one ? Is it greater than the steel trans ?
  17. A

    Transformer specs

    Hi . I started to use Psim to simulate the smps but i dont know the specs (rs rp ls lp lm np ns) of ferrite transfo . I tried; rp 1ohm rs 0.1 ohm lp 220u ls 5u lm 0.1m but the circuit was extremly inefficient ☹️
  18. spud1

    PAT testing transformer plugtops

    When PAT testing is it necessary to carry out insulation resistance or load/leakage on a Class II (Dummy earth pin) transformer PSU type plugtop? (e.g. phone charger, monitor PSU) Or is just a visual inspection needed?
  19. U

    What building can I put 3-333kva, single phase distribution transformer?

    What building can I put 3-333kva, single phase distribution transformer?
  20. R

    Undersized low voltage transformer?

    I've just moved into a place that has low voltage halogen lights in the kitchen. I had a look at the installation and I see they are running 6x20w G4 halogens off a single DA-E60 transformer - specifications for the transformer shown below. I measured the amperage draw of the light bulb at 1.8A...

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