Two phases to house - loss of neutral
in [Repair]
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From: Baron on 25 Nov 2009 17:44 Sylvia Else wrote: > baron wrote: >> Sylvia Else Inscribed thus: >> >>> Baron wrote: >> >>>>> Removing the return leg isn't going to cause problems in a >>>>> properly wired US home. Don't know about the UK. >>>> The lights would go out ! Domestic properties usually have just a >>>> 240v >>>> single phase feed. Usually you would get a single phase running >>>> down one side of the street and another phase running down the >>>> other. >>>> >>> I said I have two phases. >>> >>> Sylvia. >> >> Yes I know ! I answered the question above ! >> > > You think I'm mistaken about having two phases? > > Sylvia. Are you really thick or just pretending. -- Best Regards: Baron.
From: Sylvia Else on 25 Nov 2009 17:56 Baron wrote: > Sylvia Else wrote: > >> baron wrote: >>> Sylvia Else Inscribed thus: >>> >>>> Baron wrote: >>>>>> Removing the return leg isn't going to cause problems in a >>>>>> properly wired US home. Don't know about the UK. >>>>> The lights would go out ! Domestic properties usually have just a >>>>> 240v >>>>> single phase feed. Usually you would get a single phase running >>>>> down one side of the street and another phase running down the >>>>> other. >>>>> >>>> I said I have two phases. >>>> >>>> Sylvia. >>> Yes I know ! I answered the question above ! >>> >> You think I'm mistaken about having two phases? >> >> Sylvia. > > Are you really thick or just pretending. > I'll opt for neither. So far you've said nothing relevant to the thread, which concerns a house with two connected phases. If you think otherwise, try explaining yourself better. Sylvia.
From: D Yuniskis on 25 Nov 2009 19:28 Hi Sylvia, Sylvia Else wrote: >> Are you really thick or just pretending. > > I'll opt for neither. So far you've said nothing relevant to the thread, > which concerns a house with two connected phases. Have we decided that you really have two different *phases* vs. two different *legs* (but really "single phase" -- think center tapped transformer). E.g., 3 phase "220" (US) is three conductors plus a ground. If you look at any two of those conductors (ground referenced) you would see a 120 degree PHASE lag between them. A US residential service is "single phase, 220" in which you have two 110V circuits ("legs") 180 degrees out of phase with each other (i.e., the center tapped xformer concept). So, here, half of your lighting/living circuits are on one *leg* (so those appliances are nominally 110VAC) and the other half on the other "leg". Some bigger loads tend to straddle both legs (220) -- e.g., the blower motor in the evaporative cooler. Other appliances *use* both legs but actually as two 110V *circuits* (i.e., higher ampacity available on two conductors). > If you think otherwise, try explaining yourself better. (sigh) There seems to be a *lot* of vitriol in this group. Sad when you would *think* people were (supposedly) reasonably intelligent (?). Crappy S/N ratio! :> --don
From: Trevor Wilson on 25 Nov 2009 19:42 "Sylvia Else" <sylvia(a)not.at.this.address> wrote in message news:01059875$0$23368$c3e8da3(a)news.astraweb.com... > Baron wrote: >> Meat Plow wrote: >> >>> On Tue, 24 Nov 2009 11:10:26 +1100, Sylvia Else >>> <sylvia(a)not.at.this.address>wrote: >>> >>>> I have to phases of power supply to my house - so three power lines, >>>> two phases plus neutral. >>>> >>>> I've on occasion wondered what would happen if we lost the neutral >>>> line. It seems to me that we'd then have the voltage between the two >>>> phases across two sets of appliances, one set attached to one phase, >>>> and the other set attached to the other phase, with the two sets in >>>> series as a result of their common connection to the neutral wire. >>>> Since the two sets are unlikely to represent equal loads, the net >>>> result would be a large overvoltage on one set of appliances. >>>> >>>> My electrician says it's not an issue, but I can't see why. >>>> >>>> Any thoughts? >>>> >>>> Sylvia. >>> Removing the return leg isn't going to cause problems in a properly >>> wired US home. Don't know about the UK. >> >> The lights would go out ! Domestic properties usually have just a 240v >> single phase feed. Usually you would get a single phase running down >> one side of the street and another phase running down the other. >> > > I said I have two phases. **You are, at this time, discovering the futility of asking a question that is specific to Australia, in an international group. Some very quick, informal examination of the houses nearby (about 50 or so) suggests that around 10% are single phase connected, another 20% are three phase and the rest are two phase. In my last home, the figures were more like 30% single phase, 10% three phase and the rest were two phase. The likely reason was that in my last home, town gas was available. At my present address, town gas is not available. There are also larger, more expensive homes where I live now and these people tend to have more power for various appliances like pool/spa heaters, big air conditioners et al. I would hazard a guess that the majority of Australian homes are two phase connected. And, unlike the US, almost no domestic appliances (outside large air conditioners and pool heaters) use more than a single phase. -- Trevor Wilson www.rageaudio.com.au
From: Sylvia Else on 25 Nov 2009 19:43
D Yuniskis wrote: > Hi Sylvia, > > Sylvia Else wrote: >>> Are you really thick or just pretending. >> >> I'll opt for neither. So far you've said nothing relevant to the >> thread, which concerns a house with two connected phases. > > Have we decided that you really have two different *phases* > vs. two different *legs* (but really "single phase" -- think > center tapped transformer). Four wires on the power poles in the street, being a three phase supply. We have three wires leading from the street, and two power meters, plus a third meter for the off peak water supply. Sylvia. |