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  1. J

    Single to 3 phase converter

    Can't tell from the outside. The converters have a 230/400V transformer - which may then give one phase to phase voltage say L1- L2, then there are a set of capacitors to generate a phase shift to L3. If the control circuit is placed across the same phases as the internal transformer in the...
  2. J

    Single to 3 phase converter

    I think it is a pure 3 phase lift, as it's rated as 3ph +pe rather than 3ph 4w + pe I assume the control circuit will have a 400/24V transformer - this must be powered up by being on suitable phase connections - it may currently be between L2 & L3
  3. J

    Single to 3 phase converter

    If it's a static converter, yes those figures would appear correct, static converters provide the correct voltage over two phases and a phase shift to the third, completely unbalanced and of the wrong phase angles, but they are designed to run a single motor. Once this motor starts it...
  4. J

    Is new cu required for new oven install?

    Nothing wrong with that consumer unit. (ish) It has two RCDs! He can't even count. You could get the 40A MCB changed to a 20A or 25A, they are available if you want. Now, it is the case that that consumer unit does not meet current standards, but in itself that doesn't mean it has to be...
  5. J

    Is new cu required for new oven install?

    He's either lying or totally incompetent! If the new oven is only 20A than the MAXIMUM it can draw is 20A. It doesn't matter that the supply is suitable for up to 40A, the oven can only draw up to 20A . This is pretty basic stuff for an electrician! So, regulations: Since the oven is known...
  6. J

    Course name for working on HV Pylons?

    Not sure tbh, different utilities, different terms; it may be competent person A is needed with that utility (enwl), perhaps not with others. The requirements are usually just simple follow the rules type courses.
  7. J

    Course name for working on HV Pylons?

    For work on transmission towers - non electrical he would need WI-1 or competent person A (Depends on the utility - they have their own courses) This is a pretty basic course to allow non electrical work near on on live electrical equipment - but it would need to be approved/authorised for...
  8. J

    Course name for working on HV Pylons?

    Paint these things?
  9. Pylon Box_Pylon.jpg

    Pylon Box_Pylon.jpg

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  10. J

    What are the causes of unbalance current during no load test of transformer?

    Test voltages As stated you either have a breakdown at high voltage, or you have inter-turn failure probably on the single hv winding. Have you flash tested it or not? If so what voltages hv & lv?
  11. J

    What are the causes of unbalance current during no load test of transformer?

    What voltage did you apply to the primary side?
  12. J

    What are the causes of unbalance current during no load test of transformer?

    OK Since you see the current between two phases on the delta winding, this means the one winding is either at fault, or (more likely) the secondary has a fault - I would guess one high voltage winding has a fault somewhere along its winding to earth (the star point being earthed) or has an...
  13. J

    What are the causes of unbalance current during no load test of transformer?

    What is the winding group? Yny Or Ynd1?
  14. J

    Scottish Electrician Advice

    The type of work required for notification is quite different between England and Scotland, but I would think ends up around the same, if you concentrate on work in detached properties, it would require fewer notifications in Scotland than the same work in England, on the other hand, almost...
  15. J

    Scottish Electrician Advice

    As per your previous post, no, this does not actually achieve the level required to demonstrate competency. 2365 is an introduction, it needs to be followed up with 2357 or equivalent, for example it only contains 8 hours of practical installation type work. The document I posted on your...
  16. J

    Who Can Work as an Electrician?

    Yes, you need to prove competency to the particular scheme, for the particular work you want to do. Domestic is usually A1.1 or A1.4 You would need more experience to add A2.1
  17. J

    Who Can Work as an Electrician?

    As stated above the schemes have their own requirements, - links already provided. You can also link to the minimum standards from that link, which is repeated below https://electrical.------.org/bs-7671/building-regulations/electrotechnical-assessment-specification/ Not sure why but this...
  18. J

    Who Can Work as an Electrician?

    There are standards for what is considered the minimum competency - but it depends on the work you want to do, hence the link I provided above. It is not unregulated! No just thinking you are competent is not sufficient - in practical terms you need to join a scheme and they have entry...
  19. J

    Who Can Work as an Electrician?

    It's the same in Scotland as it is in England, Wales etc. To do any work as an electrician you have to be competent. That's actually it! However, should you need to prove competency, for example if you appear in court following an incident, or for a job etc. They will look for suitable...
  20. J

    Capacitor in AC circuit

    A pure capacitor will have a phase difference of 90 deg between voltage and current on ac sine wave. Irrespective of the capacitance, voltage, current, frequency, dielectric etc. In practice a real capacitor will have resistance between the plates (parallel resistance), it will have...

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