Discuss Polarity on this led driver in the UK Electrical Forum area at ElectriciansForums.net
'Probably'?The AC input can probably be connected either way round on that.
'Probably'?
Just got through to them. No polarity. You were correctThe AC input can probably be connected either way round on that.
Just got through to them. No polarity. You were correct
Even if it does say L&N it still makes no difference,
Not true, even a non-contact pen proves otherwise.Even if it does say L&N it still makes no difference, there is no way for any electrical product to know which way round the AC is connected if its just a two wire connector.
For equipment that has no connection to earth, why might reverse polarity be an issue? What I mean is, if a fuse isn't for earth fault protection, it would be for overcurrent protection: opening the circuit anywhere would deal with the overcurrent problem.Yes it does as any fuses or similar protection will be in the L path within the equipment.
It will depend on where the reverse polarity occurs.For equipment that has no connection to earth, why might reverse polarity be an issue? What I mean is, if a fuse isn't for earth fault protection, it would be for overcurrent protection: opening the circuit anywhere would deal with the overcurrent problem.
What further problems could occur if the N was open rather than the L? (Not disputing what you're saying BTW, just asking). The only equipment like this that I can think of that would be a problem reverse polarity would be class II ES lampholders.
How will the fuse or driver know which way round its connected though, there wont be any earth present so its just two live wires with 230V across them, both are live with respect to each other 50 times a second, there isn't any live or neutral as far as the driver is concerned.Yes it does as any fuses or similar protection will be in the L path within the equipment.
Understood, but in the context of post #8 we're talking about reversing the wiring at the equipment rather than the upstream circuitIt will depend on where the reverse polarity occurs.
If it’s at the supply end for instance the cable will remain live as will the item.
Not true, even a non-contact pen proves otherwise.
The pen would still only work on the L side whether that’s the chassis or not.I'm not too sure how those pens work but I assume you are creating a path to earth for it when you hold it, much like a neon screwdriver. Live and neutral are both at 230V relative to each other, its only because one side is tied to earth that it becomes the neutral, you could tie the other side of the supply to earth instead and that would then become the neutral.
Even a class 2 enclosure circuit could rely on the polarity having to be correct as a fault could make the o/p L instead of N it would have to be a pretty crap circuit for that to happen though.Understood, but in the context of post #8 we're talking about reversing the wiring at the equipment rather than the upstream circuit
It mattered if you were repairing them, 60 years ago!Radios tvs etc with a figure 8 cable plug can be put in either way… so doesn’t matter there….
they would be hard wired the right way round back then.... not a detachable cable that could be turnedIt mattered if you were repairing them, 60 years ago!
they would be hard wired the right way round back then.... not a detachable cable that could be turned
You think so? Reversible two pin plugs and line sockets were common.they would be hard wired the right way round back then.... not a detachable cable that could be turned
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