system

  1. N

    277 Volt lighting. Y system. I have a string of lights out in a hallway.

    277 volt Y system lighting circuit. A string of lights out in a hallway. Have 277 to ground on both my hot and my neutral. Have only 15 volts between my 277 hot and 277 neutral. This was discovered Friday afternoon, Co. does not pay OT so its my unwanted challenge for Monday. Will look at prints...
    • NKH Kris
    • Thread
    • ground lighting lights neutral out screwfix string system volt wire
    • Replies: 1
    • Forum: UK Electrical Forum
  2. T

    Fire system installation training

    Hi all, I'm looking for some help with regards to Fire system installation training. I'm currently working with a friend of mine installing addressable fire systems. I come from a mostly house bashing background but looking to add more strings to my bow. Basically I'm looking for any suggestions...
  3. L

    PV SYSTEM

    IM TRYING TO FIND OUT HOW TO CALCULATE "ESTIMATED ANNUAL GENERATION" OF PV ISTALATION. 7.2 kW THANK YOU
  4. S

    UK Alarm

    Hi all, I’ve just wired an alarm system for my house but don’t have a clue which alarm system to fit in terms of brand. Need some recommendations please?
  5. M

    Earth fault on a TN-S system

    So here is the situation 22kV/415V delta-star transformer with neutral point earthed on secondary Downstream breaker of transformer 630A with earth fault setting 0.2xIn @ 100ms This supplues a number of outgoing loads with respective 50A breakers which only have thermal and magnetic settings. An...
  6. Z

    Are my x2 2.5sqmm cables suitable for a 5kW E/W system?

    Hey guys, Firstly just to say that the PV system is being installed by a certified company/electrician, so this query is just to satisfy my own curiousity really. Also I’m based in Ireland and I know our regs will be slightly different. As I was slowly renovating my house I had in mind that I...
  7. M

    Turn on central heating when no wifi with Nest system ?

    Hi, My daughter's wifi has gone down, all of south west London Virgin users have no wifi for past 3 days due to someone cutting a cable. She has just moved into a house with Nest installed and is using underfloor heating to get heat. Does anyone know how to manually turn on the heating with...
  8. C

    Ship Power System

    Is the neutral distributed (or earthed for that matter) on a ship? I keep seeing this:
  9. C

    Earthing neutral in a multi source system

    This has me clueless. Why must the neutral be unearthed at the transformer and generator and only allowed earthing at the switch-gear? I can't see any reason because the neutral will normally not be carrying any current and thus no parallel current paths would form.
  10. M

    Weathercall system.

    Can anyone tell me how the Scottish power weathercall system works, and how would I know that it is still working.
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