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Dimmer pull cord problem

Discussion in 'Electrics UK' started by houstonwehaveaproblem, 28 May 2014.

  1. houstonwehaveaproblem

    houstonwehaveaproblem

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    Fitted a dimmer pull cord from toolstation.

    States no neutral required on instructions.

    Week later dimmer stops working. (no movement from the actuator when pulling cord)

    Replaced with another. Few days later stops working, same as before.

    I have 5 x 12v 50w halogen spotlights each has a dimmable transformer fitted

    Any ideas what the problem is? Overload? No neutral problem?

    Cheers
     
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  3. RF Lighting

    RF Lighting

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    What's the rating of the switch?
     
  4. houstonwehaveaproblem

    houstonwehaveaproblem

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    Have just found this info when scouring the net.

    Max 250W incandescent load / 175W transformer load

    I guess my combined wattage is overloading it?
     
  5. Taylortwocities

    Taylortwocities

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    Do the maths. Is 5x50 = more than 175?
     
  6. winston1

    winston1

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    You shouldn't dim halogen spotlights anyway, it reduces their life.
     
  7. securespark

    securespark

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    Do me a favour:

    Re-arrange the following letters -

    Rabbit use rut push yoke
     
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  8. JohnW2

    JohnW2

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    I've resisted commenting previously, but am starting to tire of the umpteen times I'm seeing this assertion wheeled out in assorted threads, so ....

    As I understand the situation, you and eric (and maybe others) have probably only half-understood what you have read - either that or you haven't read it properly ... dimming a filament lamp is normally expected to result in a considerable increase in the life of the lamp. However, because the lower temperatures of a dimmed halogen lamp interferes with the halogen cycle, the increase in life is usually less (sometimes considerably less) than what would be expected with a standard incandescent filament lamp. However, "not as much increase in life" is obviously very different from "reduction in life".

    Kind Regards, John
     
  9. houstonwehaveaproblem

    houstonwehaveaproblem

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    Im not biting!
     
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  11. Taylortwocities

    Taylortwocities

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    Here's a hint
     
  12. bernardgreen

    bernardgreen

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    Dimming halogens

    My understanding is that the earlier large volume halogen filled lamps did have a shortened life when run below design temperature as the metal vapour could condense on the glass ( quartz ) and thus metal was lost from the filament. The sign of this condensed metal was darkening of the glass.

    In modern very low volume lamps, such as capsules, where the glass (quartz ) is perhaps only a milli-metre from the filament the glass itself becomes so hot that the metal vapour cannot condense on it.
     
  13. houstonwehaveaproblem

    houstonwehaveaproblem

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    Yup
     
  14. winston1

    winston1

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  15. AndyPRK

    AndyPRK

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    Or you could ask, does anyone dim halogen and experienced short life ?

    Even the Gls bulbs have halogen inside these days.
     
  16. winston1

    winston1

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    Unless you have 2 banks of lights one dimmed and one not all on for the same time it can be difficult to tell.
     
  17. AndyPRK

    AndyPRK

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    Why ? Because they are so unreliable anyway ?

    I would have thought if it was a real & significant problem, you would know about it.
     
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