Wiring Regulations Literary Question

Alan S:

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

Since we've moved on from incandescent lamps and discharge lamps in favour of LED, is the statement still valid?


In fact, with LED drivers outputting constant current, the situation is perhaps a little more complex:

• Lower input voltage = more AC current = greater losses from volt-drop in the AC circuit supplying the driver

• Raising voltage puts voltage stress on the "live side" (AC and rectified AC) of driver components

• Lowering voltage puts more current stress on the "live side" driver components

Alan S:

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

Since we've moved on from incandescent lamps and discharge lamps in favour of LED, is the statement still valid?


In fact, with LED drivers outputting constant current, the situation is perhaps a little more complex:

• Lower input voltage = more AC current = greater losses from volt-drop in the AC circuit supplying the driver

• Raising voltage puts voltage stress on the "live side" (AC and rectified AC) of driver components

• Lowering voltage puts more current stress on the "live side" driver components