transformers | Page 7

transformers

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  1. H

    ct's current transformers problems

    i have a problem with mutipue ct's the main ct is at the intake shed then the cable runs to the building there there is another ct in the basment then goes upto more ct's for the db's on the 3 floors. the 3 ct's for the db's add upto the same as the main one in the shed but the one in the...
  2. P

    Isolation Transformers and consumer unit RCDs

    Hello A little help here would be appreciated. I often use a 230/110VAC 3kW isolation transformer for review testing computer power supplies on 110VAC at home. My problem is that every once in a while I plug the transformer in and the ring main 30A RCD trips out. It's not every time so I...
  3. R

    Rating downlight transformers....

    Here's a silly question. I've never put in a transformer-type light before, so bear with me please.... I=Watts/Volts, yea? But, when I am using a 35w halogen and a 240-12v transformer for each downlighter, do I work out the amperage as 35/12, or 35/240?? Or something else? 2.9 amps per light...
  4. P

    transformers

    hi currently doing transformers and has anyone got a chart/method working out the turns ratio and current on each side thanks
  5. brucelee

    testing selv lighting

    hi everyone, when ir testing a selv lighting circuit if you cant get to the transformers to disconnect the transformers do you test at 250v and test between line&neutral connected together and test between them and earth is that correct
  6. D

    LED and electronic transformers

    Subcategory - Lighting Hi, I have recently been experimenting with LED replacements for halogen 12 volt downlights. The instruction state NOT to be used with an electronic 12 v transformer, however I find they work very well using an electronic transformer if the load is sufficient, (ie...
  7. B

    Testing r1+r2

    its me:), Hi all,new to testing so go easy on me if it's a silly question,On a periodic when testing r1+r2 & zs on a lighting circuit with ELV downlighters fitted how is it done.If the transformers are not accessable:eek: for bypass or disconnection is the r1+r2 test just done...
  8. Q

    10kva three phase site transformers

    Hi Folks, we building 6 storey block of flats and need a quite few 30 units of 10kva transformers connecting up to the mains. At the moment we have five trafo on 32A type C braker and that gives us a proper headache with its nusianse tripping, even without any load. Can anybody tell us how many...
  9. Mark.W

    Testing Downlighters

    Hi Chaps I am going to see a customer on Thursday with regards to a downlighter in his bathroom tripping the breaker, I suspect the downlighter isn't suitable for a bathroom which has corroded the terminals but will investigate further on thursday. My question is, if i have to replace the...
  10. Mark.W

    Outside socket

    Chaps A friend has asked me to put an outside socet in for him, It's a simple run, basically about 3 m in length. I am going to use an IP55 weatherproof socket, but not sure what size breaker to use 16A or 20A? Could one of you kind gents please advise me? It will be on a 30mA RCD as well...
  11. E

    Line & Neutral Testing

    When testing an existing circuit lighting circuit I found that there were a great many 12v lights in the bedrooms and bathroom and was unable to access some of the transformers therefore I was unable to test between line and neutral with the switches shut, would this be acceptable on the...
  12. A

    Low voltage lighting

    I was thinking of fitting a transformer near the consumer unit and supplying all the downstairs lighting circuit with 12v and changing all the fittings. Has anyone done this and is there any likely problems.
  13. E

    electrical transformers

    he guys.. we are planning to buy a distribution transformer to supply to our welding shop. The source of the distribution company is 13.8 kv. i'm trying searching on the internet for but there as so many i want a quick answer.. Thanks..
  14. S

    loop resistance & capacitance voltage transformers

    1. To measure loop resistance of small motors rated in KVA, we simply use a multimeter to get required results while for large motors/equipment rated in MVA we have to use a test set through which we apply some current & get the results. Why doesn't multimeter work there? 2. What is the...
  15. J

    working out loading of transformers

    please could anyone help me with this simple question.Just wanted to know how i can convert my transformer rating to amps,as i want to know how many low voltage lamps i can put on a circuit.Its only e.l.v halogen lamps.The rating is 20-60va:confused:
  16. U

    electronic transformers

    what are they how do they work ho do you tests these are electrically safe - flash test etc anyone got any info on em
  17. B

    Why are my adapters (power transformers) getting so hot?

    I'm talking about those little black boxes with a cord attached to them that usually come with various electronic devices (guitar amps, modems, cordless telephones, etc.). When I plug in the adapters to my various electronic devices, both the adapters and the devices are getting hot. This has...

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