Many properties (larger homes and any business premises and abive in the UK) are supplied with three phase electricity, which is 230v phase to neutral and 415v phase to phase. 120 Degree phase offset between the phases. Very potent (and useful!)
Our normal supply for residential is 230v phase to neutral, mostly as already mentioned with N&PE joined at the cable entry to the property but some (e.g. pole fed) only have L and N provided and earth is via an earth rod (TT installation). RCD protection is mandatory in these circumstances (and essentially mandatory anyway now as increasingly regulations require more circuits to be protected). 30mA RCD protection for most circuits and 100mA and / or time delay if upstream for discrimination. The rest of Europe is 220v, so a little lower than the UK, but we harmonised by being +6% and -10% tolerance while the rest of the EU is +/- 10%. The US way with 220v centre tapped is quite noval, but 3 phase is great for workshops as it gives great torque in motors, though modern VFD controllers bridge the gap mostly. On Friday, 21 March 2025 at 23:51:21 UTC David Pye wrote: Not just the UK - the whole EU is like that! David On Fri, 21 Mar 2025, 23:40 gregebert wrote: Wow! I had no idea the full 220V was present in the UK; that's a very dangerous voltage to touch. In the US, neutral is connected to GND at the point-of-entry to the building and there is also a grounding rod though the electrical code only requires a maximum of 25 ohms to Earth (it varies due to soil condition), and definitely wont suffice as a redundant neutral. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion, visit https://groups.google.com/d/msgid/neonixie-l/0d8096f1-1e24-41e3-a067-75ebe3ada443n%40googlegroups.com.
