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Yes - It's the same arrangement as the split-phase distribution arrangement which can still be found in rural areas, just at about a quarter of the voltage and without the neutral being distributed. But I see from that other topic that the IEE has now decided this should be called "two...

Exactly. A 110V CTE site transformer is supplying only one current to the load. The fact that there's an earth on the centre tap of the winding doesn't change that. You could move the earth from the centre tap to one end of the winding and it would make no difference to the current, only in...

Since when? All the editions of the IEE regs as far back as the year dot recognise it as a single phase supply (like the 3-wire 200/400 - 250/500V distribution systems found in rural areas). Is this some recent change? If so, then it's quite simply wrong. The old 2-phase 4-wire system -...

The 110V site supplies in the UK can be derived from either a centre-tap earth 110V transformer, in which case it's a single-phase supply, or from a 3-phase secondary with star-point earth, in which case the supply is obviously three phase. But in either case, when you make a two wire...

Strictly speaking according the wiring regs, they should be brown, brown, and green/yellow, as it's a single-phase circuit.

If you already have the hardware and the computer is running all the time, then that would certainly be possible. For an automated call at some fixed day and time just set up the required schedule with cron, Windows task scheduler, or whatever equivalent you have with the OS you're using...

Hi all, Are you absolutely certain about the cable size? Red/yellow/blue without earth is quite likely to be 1960's cable, which will predate metric sizes. Are the conductors stranded, consisting of three strands each? If so, then what you probably have is 3/.029 or 3/.036 from the...