Yes but on several occasions on here I've been told it's single/anti/split phase, or whatever terms they come up with.You should already know you're not the only one - as well as myself, you also have BS7671 as company...
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Kind Regards, John
Do Away With Ring Final Circuits?
- Thread starter securespark
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One of which was identified as the inspector for this job: https://www.diynot.com/diy/threads/armoured-cable-using-steel-for-earth.560613/#post-4830190
I assume you say that on the assumption that what is legal in one EU country is legal in all. In which case they are still legal in all as they are compliant in Ireland and Malta.
However I have heard of cases of Brits wiring their EU property to UK all specs and having it rejected.
The US is 120v not 110v. However you are very much in the minority and obviously never had the frustrating wait for a kettle to boil in the US. Over the last 50 years or so many 110/120v countries have converted to 220/240v. S. Korea and Indonesia come to mind not forgetting parts of Europe that used 127v 50 years ago.
Nominal 120 Volt but in practice can be as low as 100 Volt due to the voltage drops across the distribution system.
Pole mounted tin can transformers each serving up to 4 houses cannot be tap changed to bring the supply back up to 120 Volt when the load increases
I don't have anything in writing in front of me but the words are something to the effect of 'Compliant in other member states'.
One of the office floors being refurbed for a new client we worked on installing AV had a foreign contracter for the electrics and everything they did was compliant "In our country" - with a very eastern accent. Hundreds of 16A, double pole MCB radials all wired in 1.5mm² flex (non harmonised colours, IIRC the colours were black L, blue N & red E (25 years ago so could be error). The legal team tried hard to get it changed but the contracts were electrically sound (as opposed to watertight
)Me, too, but my answer is always the same!
With two lines 180° out-of-phase with one another (the left-hand BS7671 diagram), most electricians in the UK seem to call that "split phase".
I can't say I've come across 'anti-phase', but, in my opinion, to use "single phase" for such a supply is just plain confusing/misleading, since there clearly are two 'phases'.
As far as I am concerned, any 3-wire supply which has two lines which are out-of-phase with one another is "two phase", whether the phase difference is 90°, 135°, 180° or whatever - 180° is merely one possibility out of a continuum of possibilities.
Kind Regards, John
So how would you describe a 3-phase supply with no neutral, for a delta-connected 3-phase load, to avoid confusion?
It's still 3-phase - even without external references (such as a neutral, or 'earth'), the pd between any two of the supply cables will be out-of-phase with the pd between any other two.
Kind Regards, John
I don't think there is, or ever has been any doubts about the title of a 3 phase system, whether star or delta supply and or load.
So many seem to think that a because the PD across the outers of a transformers centre tapped secondary remains unchanged if the CT is earthed or not that it has to be single phase.
So many seem to think that a because the PD across the outers of a transformers centre tapped secondary remains unchanged if the CT is earthed or not that it has to be single phase.
Nor do I - but, as you realise, it was not me who suggested otherwise.
Yes, they seem to. If that's what they believe, perhaps they should be invited to join together those two ('same {'single'} phase' in their minds) ends of the winding
Kind Regards, John
They know what would happen... smoke! as there is 110V (or whatever voltage)If that's what they believe, perhaps they should be invited to join together those two ('same {'single'} phase' in their minds) ends of the winding
Kind Regards, John
Exactly - which, as I was implying, might make them re-think their idea that the two conductors they had joined together were 'on the same phase' (of what they regard as a 'single phase' supply - such that there could only be 'one phase')!
Kind Regards, John
This is where a little knowledge confuses.
Take the typical yellow 110V transformer for example, it is usually plugged into a 13A single phase socket. the tool plugged into it, let's use a lamp as an example and I'll go further and specify an incansecent filament lamp so there are no doubts, is a 110V single phase device. To many people (and most non electrical people) there is no reference to 2 phase in the situation.
Now take that further and use a 400V filament lamp across 2 phases, it is still a single phase load and as there is no neutral connexion (as in the star point neutral) it is a single phase supply coming into the lamp in exactly the same way as a 400V transformer secondary.
I'm not surprised there's confusion.
And to compound the confusion, from a 3ph delta supply how does one obtain 230V.
I presume that you are now talking about a 3-phase supply. If that's the case, the only confusion will be in the minds of those who understand the difference between the nature of the supply and the nature of the load - there are countless single-phase loads fed from 3-phase supplies. Indeed, in my house every circuit and load is single-phase, despite the fact that the house has a 3-phase supply.
Kind Regards, John
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