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Posted the above before getting to your message, but that's the point which it sounds as though you've got now. As above, it depends entirely upon which way round the speakers are connected. Supply ----- (+) Spkr-1 (-) -------- (+) Spkr-2 (-) ----------- Supply will result in the...

But they will. Call the current as measured at one end of the supply winding I1 and the current as measured at the other end I2. Take two loads, R1 & R2, connect them in series across the full supply (i.e. no neutral connection). I1 must be the same as I2 and they must be in phase. They...

Exactly. With a two wire connection it cannot be anything but single phase. There are many single phase distribution transformers in rural areas which are connected across two phases of 11kV. The transformer and resulting supply on its secondary are still only single phase. However, that...

No - The currents will be in phase (assuming we're not complicating things with non-resistive loads). Could be. But CENELEC isn't the world. Of course a phase angle can be 90, 180 or 270°. That doesn't mean that just because you can see a 180° difference in voltage waveforms between two...

I know it isn't, but the pound is the same.

I have to agree. It might be more work to install the cabling, but I would never contemplate a wireless system when a hard-wired system will be much better, more reliable, and more secure in the long run.

Could be, but it might have been black. I remember dealing with a lot of French equipment in the seventies, and on some of the cords it was very dark brown, but on others it really was black.

Why shouldn't it have been? The basic electrical theory shows that it is single phase. If it had been called something wrong in the first instance, I think the ooportunity to correct the incorrect terminology would have been taken long before now. And just because, apparently, the...

And in Canada, plus those parts of Latin America and the Caribbean which generally follow American standards. Certainly that was the case in Germany, I think Austria, and at least one of the Scandinavian countries in the past (Denmark? Sweden? - Can't recall off hand).

It was pretty common on Continental equipment in the 1970s instead of brown, especially gear from France.

But single phase doesn't suddenly become two phase, any more than AC suddenly becomes DC. If it's something like 2P+N from a 3 phase supply then yes. But you can't do it with a single phase supply.

It all rather strange, all right. On the Scottish bank notes issue, I remember some years ago doing a job for a Scot who was down here for a while and he wanted to pay cash. He had a wallet full of Scottish £20 notes but said something along the lines of "I don't suppose you'll take these...

Which is bizarre. Everybody's known it as a single phase for well over a hundred years of electrical engineering. Look in any decent book on the subject published in all that time and you'll find it referred to as a single phase arrangement. Because you can connect three different things -...

If you use the centre tap as your reference point, then obviously the voltages at each end are 180º out of phase. That's a natural consequence of the way the transformer works, and is made use of not only for 110V CTE supplies and 240/480 distribution in the UK (or 100/200 - 120/240 elsewhere...

Cookers, dryers, larger heating units and fixed air conditioners are the usual 240V residential applications. But a dedicated 240V socket can be provided for any higher powered appliance which might be needed (although the foregoing list covers most domestic stuff). Washing machines are...

Thanks for clarifying that. No, not a practising electrician, I'm in data & telecoms work, so although I'm familiar with the IEE regs to some extent, I don't keep up with them and don't know all the latest changes in recent editions.

And in Canada, parts of Latin America, and some parts of the Caribbean. The same system is also used in Japan, just at a slightly lower voltage (100/200). And in all cases it's known as a single phase supply system, just as the similar 3-wire systems in Britain (just at double the voltage)...

Sorry, what's the BGB? The current edition of the wiring regs? If so, then I don't have a copy. That's all you have with a 110V CTE supply. The centre-tap earth isn't a current-carrying conductor (except under fault conditions), merely a connection to reference the supply to earth. It's...

It all depends upon the point you choose as a reference. For a 110V CTE supply, if you use the centre-tap as your reference, then yes, the voltages on each live leg will be 180º out of phase which each other. Use one of the live ends as your common reference point then the voltages as seen at...

If it's a fairly modern installation, then for a regular single residential line you'll find the orange & white from the black drop wire connected to the terminals in the master jack. If you plug a phone into the test jack and it works and shows the correct number (dial 17070 to check), then...