Let's start by guessing what the appliance is that these instructions apply to.
Let's start by guessing what the appliance is that these instructions apply to.
I just answered my own question, yes there is.
Apart from being a low reading 0.031776Ω is particularly precise.
And I challenge anyone to actually measure that with any normal hand held testgear, especially a modern "no trip" loop tester that only sends a slack handful of electrons round the loop anyway. A reading of 0,3 +/- 0.1 and one more total 'fruit machine' digit behind that may be closer to real test results.
FWIW, a 40A step on a 0.3 ohm supply corresponds to 12V of voltage twitch as the load comes on - and to be honest, that is probably the best way to measure it with any sort of real precision, if you really need to.
Mike.
The interesting feature of this standard is that it is completely unnecessary and foolish. LED lamps of the plain variety do not flicker with mains changes, they give a constant light output across the rated voltage range by design. Dimmable ones may flicker slightly with particular switching phases, but even these are designed to change brightness fairly slowly in cycle terms and one will probably not notice a slight change in brightness. Perhaps we are about to get get a new directive to change back to the horrible CFL lamps or even filament types?
As for these "magic" and rediculously small numbers, they were written by someone with no knowledge or experience of real world electrics, and rubber stamped by queues of others with no knowledge of anything! Such is the EU bureaucracy!
The interesting feature of this standard is that it is completely unnecessary and foolish. LED lamps of the plain variety do not flicker with mains changes, they give a constant light output across the rated voltage range by design. Dimmable ones may flicker slightly with particular switching phases, but even these are designed to change brightness fairly slowly in cycle terms and one will probably not notice a slight change in brightness. Perhaps we are about to get get a new directive to change back to the horrible CFL lamps or even filament types?
As for these "magic" and rediculously small numbers, they were written by someone with no knowledge or experience of real world electrics, and rubber stamped by queues of others with no knowledge of anything! Such is the EU bureaucracy!
The interesting feature of this standard is that it is completely unnecessary and foolish. LED lamps of the plain variety do not flicker with mains changes, they give a constant light output across the rated voltage range by design. Dimmable ones may flicker slightly with particular switching phases, but even these are designed to change brightness fairly slowly in cycle terms and one will probably not notice a slight change in brightness.
Not all are quite so immune ... when we were on the DNO generator the other day all the dimmable LEDs in the front room started flashing randomly for a few minutes just before the generator died ... presumably it was stuttering just before running out of fuel. Nothing noticeable on any other (non-dimmable) lights or other electronic equipment (well not until the generator finally stopped).
- Andy.
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