1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

Tube light problem

Discussion in 'Electrics UK' started by Homesafe, 12 Apr 2014.

  1. winston1

    winston1

    Joined:
    11 Jan 2010
    Messages:
    6,970
    Thanks Received:
    530
    Location:
    London
    Country:
    United Kingdom
    The PF capacitor is also a part of the circuit that puts the back EMF voltage spike from the inductive ballast across the tube when the starter opens. Without the capacitor the spike has to pass through the mains wiring making the voltage spike across the tube smaller and less likely to strike the tube first time the starter opens. Poor starting shortens tube life.[/quote]

    The PF capacitor is straight across the mains input and has no effect on the back EMF of the choke. The source impedance of the mains is extremely low and the capacitor males no difference to it.
     
  2. bernardgreen

    bernardgreen

    Joined:
    3 Nov 2006
    Messages:
    25,557
    Thanks Received:
    2,549
    Location:
    Bedfordshire
    Country:
    United Kingdom
    That is true for 50Hz sine wave but for the fast rising edges of the back EMF voltages the impedance of the mains wiring is much higher.
     
  3. Sponsored Links
  4. Homesafe

    Homesafe

    Joined:
    12 Oct 2007
    Messages:
    6,299
    Thanks Received:
    398
    Location:
    Lancashire
    Country:
    United Kingdom
    So your saying the round thing is broken? :mrgreen:
     
  5. winston1

    winston1

    Joined:
    11 Jan 2010
    Messages:
    6,970
    Thanks Received:
    530
    Location:
    London
    Country:
    United Kingdom
    If by round thing you mean capacitor, no no one is saying it is broken.

    If you mean starter we are not saying that is broken either, you have bought the wrong type, probably a low voltage one for series operation. As I have already said put back the original starter which you did not need to change with the tube anyway.
     
    • Thanks Thanks x 1
  6. DIYnot Local

    DIYnot Local

    Joined:
    3 Sep 2019
    Country:
    United Kingdom

    If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

    Select the supplier or trade you require, enter your location to begin your search.


    Are you a trade or supplier? You can create your listing free at DIYnot Local

     
  7. Sponsored Links
Loading...

Share This Page