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  1. 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...
  2. 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...
  3. 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 ?
  4. 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 ☹️
  5. 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?
  6. U

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

    What building can I put 3-333kva, single phase distribution transformer?
  7. 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...
  8. P

    12 volt catenary lighting transformer?

    Anyone any idea where I can ideally get an identical or similar replacement transformer for this (used for 12 volt catenary lighting). Any suggestions appreciated
  9. UKMeterman

    Anyone want a 11kv 1MVA transformer

    Hi, I have spotted a 11KV 1MVA transformer on an auction site, buyer collects..
  10. J

    din rail mounted bell transformer - earth?

    hi i've bought a hager st303 din rail mounted door bell transformer and a 2 module wylex ESE2 enclosure for it to fit in. i was going to run this off a 3A FCU. i can't see any earth connection on the transformer from the photo - it haasn't arrived yet - and there's nothing to earth in the...
  11. Megawatt

    Will isolation transformer absorb in rush current and not the generator

    I have a 10,000 watt surge and 7000 watt running capacity on a 240/120 vac generator. Now this is a theory I have electric heat with 10,000 watt heating elements. When the heating elements kick on it bogs down the generator to the point I have to kill the heat. The question is if I bought a 15...
  12. M

    Secondary Transformer Circuit Breaker

    Hi, I'm just curious about what will happen if I use an MCB lower than the calculated current rating. I have a 1kVA 220v stepdown to 110V transformer, calculated downstream MCB current rating would be 11.3625 if i'm right I multiplied the secondary current to 125%? what will happen if I use a...
  13. A

    LED Lights - Transformer and Lights getting very hot

    Hi All Help... I have a strip of SMD 5050 LED lights - plugged in to a 12v transformer - and both (the LEDs and Transformer) get very very hot to touch. They take about an hour to slowly get up to the high temp - and sit there at that high temperature. The strip has been cut from a 5m length -...
  14. T

    Trainee Step up and Step down transformer

    Why is Delta star transformer used for step down transformer and star delta for step up transformer? According to this book, Electrical Power Systems By C L Wadhwa
  15. B

    Industrial Control transformer

    Had issues with a 240v to 120v control transformer not supplying power to 2 cooling fans. Both fans were connected to transformer via X1 and X2 wiring. X2 wiring was not bonded to ground initially. After bonding X2 to ground, fans would run. Any explanation would be great.
  16. J

    Switch before or after transformer?

    Hello- I'm planning to install a bunch of LED lights in my kitchen cabinets. The idea is to have a small LED strip turn on automatically when opening the cabinet door. I've found a 12v LED strip that can be cut into 30cm long sections that will be perfect for my application, along with some...
  17. S

    Hazardous areas - control voltage transformer earthing -

    I've been in an ongoing debate regarding earthing of a control transformer and i'd like some other opinions. 690 primary, 120v secondary supplying control circuits (contactors/DC convertors etc), the neutral is tied to earth - My issue is the location that it is tied to Earth. As far as I know...
  18. captaincaveman

    Do MR16 Led bulbs require a LED driver or a transformer?

    Hi guys, Quick question regarding 5x MR16 (Gu5.3) Led bulbs in downlighters. The customer used to use halogen but has moved over to LED. They had stopped working due to a faulty 12v transformer I've just replaced the transformer with a constant voltage driver (1-25w) but with any more than 3...
  19. L

    Domestic Please the end of my tether with transformer/Ring

    Hi guys, Really hoping for some simple advice after a 2 year battle with my Ring Pro doorbell. To cut a long story short, and spending £ on several plugin transformers and multiple replacement Pros, I have decided to use the 24v bell transformer supplied from Ring. So, (and excuse incorrect...
  20. S

    Trainee LED transformer advice needed

    Hi, I’m wanting to remove two plug sockets that are labelled 12v only linking two strings of led 15mm spot lights. I would like to replace them with in line transformers and hide under the fireproof downlight covers in the loft. One plug is 6v 500mA DC leading to bathroom led lights x6 (2watt...
  21. N

    Domestic CAn I wire 12v downlighter transformer into dimmer circuit?

    Hi all. I've bought couple of LED tape kits which come with a 3pin 12v transformer. one of them is now wired into a simple circuit which is a single on/off switch and works great. the second set is to go into another room, again single switch but this time it's a dimmer not toggle. The kit is...
  22. C

    Transformer Neutral Grounding

    Should the neutral of the transformer be provided with separate ground rod or can it be interconnected with earth bar which also connects the transformer frame and other equipment frame grounding. Is it correct as per the European standards? ( See the attachment)
  23. spamwize2

    IR testing through transformer

    Hi all need some help, I've got a panel to test 400vac to transformer but after step down 110vac, do i megger it all at 1000v or just ignore transformer and megger at 250vac?
  24. E

    Wattage or Amperage of Transformer

    I have seen a transformer rated at 10,000 watts with input voltage of 110v and output voltage of 220v. Can input voltage of 110v and wattage of 100 watts produce the output of 10,000 watts? What determines the amperage or wattage output of a transformer? The voltage input/output formula is...
  25. M

    Increasing supply, does DNO transformer look excessive?

    Basically customer currently only has a 100A 3 phase supply, which is rather overloaded. Also has a 120KVA generator for a 55KW motor. Im trying to get a larger supply so everything will run off the grid and not overloaded. Ive spoken to the DNO in terms of trying to get a 400A supply. DNO...
  26. D

    Industrial Inspections and testing HV/LV transformer.

    Does anyone can recommend company or person from East Sussex which can do inspection and testing for transformer HV/LV ?
  27. W

    will LED's work with this transformer?

    Hi, I need to replace some kitchen lights that take G4 pin bulbs. I'd like to switch to LEDs but not sure if the transformer fitted will be too much power? Please see image and these are the bulbs I'm looking at: WOW - G4 LED 3W Bulbs Capsule Bulb Replace Halogen Bulb AC / DC 12V 48 3014 SMD |...
  28. S

    Christmas lights transformer rating

    Hi I’ve got a set of filament lamp Christmas lights, which I think is quite old. It is a set of 80 lights, and the lamps are rated at 2.4V, 0.29W, 120mA. The transformer is rated 24V(AC), 0.7A, 16.8VA. It had 8 ballast lamps installed, so I assume 1 ballast lamp for a string of 9 normal...
  29. A

    Transformer to out put 27 volts

    Hi, I have 6 x 4.5 volts led lights. Each has a 3 x 1.5volt AAA battery. Total 27 volts. I want to use a transformer to connect the six lights instead of using batteries. Please advise me on what type of transformer and where to buy it from. Thank you.
  30. R

    110 v site transformer repair ?

    I was given a couple of 3 kva site transformers, both have broken bases and all the sand has leaked out, epoxying a new base on is no problem, and I will only be using them myself at home, but what kind of sand should I refill them with ?
  31. S

    Lighting Transformer - requires earthing?

    Hi E.F. I am replacing 3 lighting transformers in my kitchen. The existing ones plug into 3 x main sockets which are on the AC mains circuit via a light switch and are earthed. The replacement transformers have no earth connection - do I need to earth the new transformers? If so, how? It's a DIY...
  32. L

    Va on a transfomer for watts

    I wanted to get one of these transfomers: What does the 100va mean, how many watts can I put through this is I run from 240v mains, from the 12v side? Thank you :-) Leo
  33. S

    Does this bell transformer have overload protection?

    Hi Folks I bought one of these Door Bell Transformer | Stevenson Plumbing & Electrical Supplies - as it's SELV and supports illuminated pushes, but can't find any...
  34. E

    Skinflint Seeks Free Advice on burnt-out LED Transformer

    Morning. The LED light above my bath doesn't work. I yanked all the stuff out the ceiling and found this. So far, so good. But hark! I have come to the conclusion that something is wrong with the transformer. Worst case: it may never transform again. If I just buy another one with the...
  35. the pict

    Welder transformer zapped

    Hi all I need a bit of help from the wise wizards I mate has a heavy duty mig welder which gave up the ghost on him I have had it apart the transformer that supplies 24vDC has no continuity through the primary and on close inspection the "in" if you like has detached itself from the terminal...
  36. J

    Bathroom mirror wiring wrong?

    I have a new bathroom mirror with lights which works ok but makes a constant buzzing noise whether it is turned on or off. It wasn’t installed by me, but when I remove the front I was surprised to see that it has been wired using 2 electric wires - see attached photo. As a complete novice I...
  37. Electron

    Can't find Lighting Transformer

    Just been on a "simple" job, changing 8 50w MR16 halogen downlights to (customer supplied) IKEA LED's (£3 each!). Pulled out the 150W transformer that supplied the first set of 4 and changed these. The other transformer must be fixed into the ceiling void. I can't feel it and the void is full of...
  38. KeenPensioner

    Isolating transformer principle

    As can be seen from my profile I am not a qualified electrician but I'm studying in my own time just for the sake of it. Everywhere I look for info on isolating transformers I get something like this "This means that the isolation transformer secondary side must not be grounded. It would create...
  39. TonyJohnson

    Isolation transformer and insulation monitoring device in horse box/bar

    The regs state 717.413 a Isolation transformer and insulation monitoring device should be used. Are there any guidance notes on type or makes i should be looking for. I see you can get 230V primary 230V secondary boxes but i'm also not sure on which to get in terms of load.. I'm inspecting this...
  40. P

    Extractor Fan Vent + Transformer

    Hullo. I was having work done by a builder who turned out to be rogue, new builder took over job and told me that he would need to change the extractor fan I had chosen as is wasn't 2.25m in height from the bottom of the bath. He changed it to another one, but when I checked it it wasn't...
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