Search results

  1. J

    Eddy currents

    Hi I’m curious about how common eddy currents are in lighting circuits run in galv conduit. When would this ever be a problem? I can vaguely remember someone saying about taking a neutral to the switches for this reason but from my understanding on a switch, the line flux will cancel out the...
  2. J

    Experienced worker route

    Hi Guys, I’m going down the experienced worker route in electrical installations and wanted some advice regarding a cscs card. I’ve spoke to the JIB and they have confirmed I can get an approved maintenance electrician hold card with the qualification’s I hold. Does it matter what card I hold to...
  3. J

    Level 3 NVQ maintenance to install

    Hi guys just wanted abit of advice I currently have my 18th edition, 2391/2 testing and inspection and a Level 3 NVQ in engineering maintenance (electrical). I’m also one year through doing a HNC in electrical and electronic engineering. I’m a bit stuck as from what I understand if I’d completed...
  4. J

    Fire compartments in a house

    Hi guys I just want some clarity on fire sealing, I know it’s meant to be done where we may need to penattrate a fire barrier to run a cable. My confusion exsists where we have an upstairs ring circuit with a fused spur down stairs. I know firerated downlighters must be used where a habitable...
  5. J

    Tri rated cable current carrying capacity

    I have a 37KW motor and need to replace some burnt out 35mm2 tri rated cable(loose connection). I’ve looked at 25mm2 Tri rated cable the data sheet says it’s current carrying capacity is 136amps. The lengths will be 0.5m.Is there any other consideration I should take into consideration? It will...
    • Jako13!
    • Thread
    • cable capacity carrying current current carrying capacity rated
    • Replies: 6
    • Forum: UK Electrical Forum
  6. J

    Soft start and high current draw

    Had one today I can’t get my head around. 4Kw motor connected to an Allen Bradley soft start. The panel runs 2 motors Both 4kw. I was called originally due to one motor not running. This turned out to be a tripped the motor circuit breaker (one with adjustable current dial). I tested the rest of...
  7. J

    Tri rated cable and grouping factor

    Hi guys I’ve got a motor starter I’ve come across and looking at the electrical drawings it’s originally had 35mm tails from a 100amp fused isolator switch. This has been replaced with 25mm tri rated cable. Looking at the specs for BS 6231 I can see the conductor can take 136 amps. Motors are...
  8. J

    Electrical safety - testing and liability

    I know I’m very health and safety conscious and electrical safety has always got me thinking with various sparks saying different things in regards to what they do and do not do. I also appreciate I am an over thinker on this subject. I will also admit having only been almost 2 years qualified...
  9. J

    Synchronous generator’s

    What is the benefit of connecting a sync gen in either star or delta? I’m trying to get my head round both methods. Do most stand by generators use star?
  10. J

    Bad practice FCU to lighting circuit

    What are your guys thoughts on this a 13amp FCU feeding of a ring feeding a light. I know usually people fuse at 3amp but if unlikely to cause overload does it actually have to be fused down?
  11. J

    Megger UL exceeded any advice?

    Have any of you had your megger come up with UL exceed. I can’t work out what the issue is? Was trying to take a measurement on a sub main for ZDB with the 3 lead method but keep appearing with UL exceeded. The system has an earth and correct polarity any ideas anyone? Thanks
  12. J

    1.25 flex of a 13 amp fused spur feeding a 3KW immersion heater

    How tight is it running 1.25 flex from a 13 amp fused spur feeding a timer for an immersion heater?
    • Jako13!
    • Thread
    • 13 amp amp feeding flex fused fused spur heater immersion immersion heater spur
    • Replies: 12
    • Forum: UK Electrical Forum
  13. J

    gG fuses and motor rated

    if I have a 20amp gG fuses and a 20M25 the continuous rating is the same but would the 20M25 behave more like a 25 amp fuse under earth fault and require a smaller ZS to operate in the same time as the gG fuse?
  14. J

    Best practices electrical maintenance

    Two questions regarding best practices. First one I don’t know if I’m being OTT but would you lock off a tripping circuit if you cannot investigate at that time? The second is regarding maintenance and removal of motors. If the motors been removed and awaiting a replacement what would you say...
  15. J

    What’s best practice terminating 2 earths

    Hi guys what’s best practice when you’ve got a CPC and the fly lead of the swa for the armour and the cores are too big to terminate into the earth bar of a consumer unit?
  16. J

    Metal panel locks on plastic enclosures

    what’s your guy’s opinions on metal panel locks on fibreglass/plastic enclosures. The reason for asking is I’ve seen a few of these enclosures fitted with metal locks and I know the likely hood of the lock being made live it extremely low but would you still class the locks as exposed conductive...
  17. J

    Hot tubs and PME or TT

    Hi guys I have a question on installing an outside supply to a spa at home. I have a few questions regarding this one is the consumer unit has no spare ways have checked maximum demand and all seems okay for an additional 32 amp load. My plan was to get a garage style CU and take out out of the...
  18. J

    Lighting circuits and having multiple legs of of a ceiling rose

    I have two questions regarding lighting circuits. The first in is , is it bad practice to put two lighting circuits on on breaker? The second is similar but can you ‘spur’ of a ceiling rose which is mid run of the circuit as many times as you want considering VD and maximum current draw/Zs...
  19. J

    110v fixed wall mounted transformer

    Hi guys is there any regulations regarding 110v centre tapped transformer transformer circuits being used outside (rcd protected) also if the transformer states 3000Va but a continuous rating of 1650Va am I right in thinking it can only carry 15amps before the transformer overloads?
  20. J

    Earth leakage

    Is there any guides on how much earth leakage is acceptable in an industrial setting ie MCC. The reason i ask is it seems to be most sites have a degree of leakage which I’m not sure is due to many VSDs being used but recently a panel I saw had 0.6amps leakage but the motor starter was all good...

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