transformers | Page 3

transformers

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  1. HappyHippyDad

    Voltage drop and it's effect?

    Hello all, just been thinking over Voltage drop!! 1. Where does the 3% and 5% figures for voltage drop (VD) come from? Appendix 4 (BS7671) gives the figures but why the different values between lights and sockets? 2. Also permitted voltage levels are -6% and +10% from 230V giving a min of 216V...
  2. C

    Way to Save Energy Bill By Power Down STand-by Transformers

    Hi, I have a question seeking member's advice pertaining to operational safety and energy saving. We have 4 sub-station each equipped with 2 transformers (1 station 11KV/6.6KV 10 MVA, 3 other stations 11KV/.433KV 2MVA) on 2x100% stand-by configuration , secondary feeding to two bus sections...
  3. polo1

    12v MR16 to LED

    Hi guys, this feels like a bit of a "simple simon" question and despite having fitted hundreds of down lights, don't think I've done this before... Customer changed existing 12v MR16 lamps for MR 4.5w leds. Didn't change the transformers though and is suffering from the leds flickering when on...
  4. S

    2 transformers / 1 switch / see diagram

    Hi, Just wondering if anyone could shed a bit of light on this subject.. As a domestic Spark,I don't have extensive knowledge of low voltage , and how it behaves during series and parallel configurations.. ( been a while since college..)... I've come across a situation where i've been asked...
  5. H

    MR16 LED's

    Hi, I was in the wholesalers last week and was getting MR16's to use as a demo for a client. I was going to get the driver to go with them, however the sales rep said that you can directly replace the current halogens with the LED's. I did as he said and they seem to work fine. I thought that...
  6. J

    Cranes and transformers

    Hi all, I was recently lucky enough to land a job that involves working on transformers and cranes as an electricians mate. As I have not done this kind of work before, I was wondering if anyone had any experience of this kind of work and could offer any information, or links, about what it...
  7. A

    Question regarding Dimmable Lights and transformers

    I have a Robus 70W dimmable transformer for MR16 12V bulbs. The transformer has 3 sockets, for three bulbs. Can I connect three Non-Dimmable 4W led bulbs to the transformer? Thanks in advance :).
  8. B

    Buzzer dimmers.?

    Hi, I've read a few threads about buzzing dimmers on here but still have a query and would like some advice please.; Customer has x4 low voltage downlights with electronic transformers for halogen lamps fitted to each downlight. These transformers are 60VA each (Saxby model ET60T-R 20-60VA...
  9. J

    Type D RCBOs

    Dear all, I have to protect a 13 amp ring main which is currently protected by a type b rcbo.The circuit is going to be used by step down transformers from the US.Notorious for tripping on start up.I thought a change to a type D rcbo would cure this,however neither MEM or Crabtree make a type D...
  10. S

    Polarity of LED 12V MR16 downlighters

    Hi all Was asked to fit two transformers for shop window display. there was 8 12V down lighters in total split into two circuits and both switched through a timer, The owner wants to replace the 8,12V dichroic MR16 bulbs with 12V MR16 LED 1.8w bulbs. The reason he wants to replace the dichroic...
  11. Simonslimline

    Dc motors and generators

    Started doing motors etc at college so been looking online at vids, found this one which is interesting so thought i would post it up. DC MOTORS AND GENERATORS - YouTube
  12. R

    No access to low voltage downlights transformers on EICR

    Evening Guys, got a house to do an EICR on and there is no access to the 3 plating/transformers on 12V downlights in 4 different rooms. Everything looks nice and pretty and shiny but its all been boxed in. the cut out diameters are to small to pull the transformers down so am unable to take any...
  13. G

    led lights on standard 12v transformers

    any opinions ???
  14. N

    Fault current on a 11'000 transformer

    Hi guys, haven't posted in a while. Working at a hospital now, we have 2 11KV transformers on site. We only run 1 at the time , the other is just used as a backup (close a bus coupler to bring it in). Being a nosy git, I asked about running both transformers at the same time. Obviously this...
  15. D

    Lamps an Transformer DEAL 52x transformers 56x lamps MR16

    All branded new in boxes will only sell as a job lot £260 Thanks Dave
  16. S

    Pylon Transformers and 3phase Inverter/Converters

    I am considering buying an ex-agricultural building witha yard, for my business. The downside of this place is there is only single phase electricity present in the building, although there is a wooden 3 cable pylon in the yard (with a single phase transformer mounted). Could anyone give me a...
  17. B

    ELV transformers

    Does anyone know how I can determine how much wattage a 105va transformer can hold and how to calc it? Not done this type of thing since college and use to using 1 transformer for 1 light
  18. A

    ELV lighting fault

    Hi I am currently training to be an electrician but am only part qualified at the min. A friend of mine has asked me to fix some ELV downlights in his kitchen. Apparently when he switches them on sometimes it can take up to 10 mins for the lights to actually come on other times it can be a few...
  19. S

    Doorbell problem

    Hi, Any idea's, 1 doorbell, 4 chimes, 2 transformers, 1 of the chimes works from 1 transformer (now not working) & the other 3 works off another transformer. So one of the chimes have stopped working. I checked the voltage on the secondary side of transformer & this was o.k & voltage at the...
  20. O

    12V d/light & their transformers

    today had a fault on some d/l's. Kept tripping checked LN-E @250V and all clear. Dropped a couple of fittings and thankfully on 2nd found the cable after the tranny had been resting on fitting and disintegrated. As said, found this on 2nd light so was happy but what if I had 20+ etc....is...

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