On Tue 30 Jul 2019 at 15:41:50 (-0400), Michael Stone wrote: [snip]
> Why would having different phases on different circuits be a problem? > It's pretty common IMO, because you want the load balanced between > them. (Unless the concern is that the crazy UK circuit loops will get > crosswired?) In general 3 phase is only used for dedicated equipment > circuits, but that's because not many portable appliances need that > much power. [In the UK] Because ordinary people get shocks from, for example, table lamps when they change the bulbs, legacy unshrouded plug pins when pulling them out of sockets, frayed cords, 101 other reasons. 240v is not usually lethal. But the big problem is any scenario by which two phases come into proximity, and you can make up any number of these. Lighting and wall power in the same room. Vacuuming down the stairs, finishing on another floor. Using an inspection lamp when looking at a large appliance that's broken down. Any of these will yield a 415v shock hazard if two phases are involved. Cheers, David.
