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Wiring Regulations Literary Question

Former Community Member
Former Community Member
Hello all, I wonder if someone can help me please?

https://en.wikipedia.org/wiki/Voltage_optimisation#Overvoltage

I'm trying to get a reference for a section in this wikipedia article to put in a report I'm writing but I can't find the original source. Under the "Common Power Quality Problems > Overvoltage" section there is a sentence that describes "A 230 V rated lamp used at 240 will achieve only 55% of its rated life". From the article I believe it is from the book "Commentary on IET Wiring Regulations 17th Edition" from 2016, ISBN 1849197652.


I have tried to find it in a library as I don't have £90 to drop on a new copy of it, just to see if it is this book I should be referencing in my report, but I've had no luck there. Is there perhaps anyone with this book that knows whether or not the quote does indeed come from it or not?


Any assistance with this query would be greatly appreciated.

Thanks in advance

Alan
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    I agree that wikipedia is an unreliable source of data about anything too complex or safety critical.


    However the fact that filament lamps are very sensitive to small changes in voltage is a well understood effect and data is available from a number of sources.

    Vacuum lamps, single coil gas filled lamps, coiled coil gas filled lamps, and halogen lamps all react slightly differently, but the differences between these are small.

    ANY type of tungsten lamp will have a short life at a higher than intended voltage. At a lower than intended voltage, life will be considerably extended but the light much reduced.


    When electricity is scarce or expensive, then a short lamp life is preferable. Electricity from disposable batteries costs about £150 per kwh ! or about ONE THOUSAND times the price of mains electricity. That is why torch bulbs are designed for a very short life, to make the best use of this very costly energy.


    In other cases, lamp replacement may be very costly in labour or plant hire. In such cases it is worth use of extreme long life tungsten lamps, the cost of the wasted energy being much cheaper than paying hundreds of pounds to change lamps atop tall structures or otherwise hard to access.


    Decades ago, I fitted 277 volt lamps on a 240 volt circuit, to greatly extend the lamp life.


    For most everyday applications, the standard 1000 hour life of a GLS lamp is a good compromise between life and efficiency.


    This is rapidly becoming of only historical interest as fluorescent, and more recently LED lamps take over the world.
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  • 0
    I agree that wikipedia is an unreliable source of data about anything too complex or safety critical.


    However the fact that filament lamps are very sensitive to small changes in voltage is a well understood effect and data is available from a number of sources.

    Vacuum lamps, single coil gas filled lamps, coiled coil gas filled lamps, and halogen lamps all react slightly differently, but the differences between these are small.

    ANY type of tungsten lamp will have a short life at a higher than intended voltage. At a lower than intended voltage, life will be considerably extended but the light much reduced.


    When electricity is scarce or expensive, then a short lamp life is preferable. Electricity from disposable batteries costs about £150 per kwh ! or about ONE THOUSAND times the price of mains electricity. That is why torch bulbs are designed for a very short life, to make the best use of this very costly energy.


    In other cases, lamp replacement may be very costly in labour or plant hire. In such cases it is worth use of extreme long life tungsten lamps, the cost of the wasted energy being much cheaper than paying hundreds of pounds to change lamps atop tall structures or otherwise hard to access.


    Decades ago, I fitted 277 volt lamps on a 240 volt circuit, to greatly extend the lamp life.


    For most everyday applications, the standard 1000 hour life of a GLS lamp is a good compromise between life and efficiency.


    This is rapidly becoming of only historical interest as fluorescent, and more recently LED lamps take over the world.
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