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Article #274Re: Two phases to house - loss of neutral
From: nesesu
Date: Tue, 24 Nov 2009 04:13
Date: Tue, 24 Nov 2009 04:13
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On Nov 23, 6:40 pm, "Phil Allison" <phi...@tpg.com.au> wrote: > "kreed" > > > From what I can gather, pretty much every home in the US has a 120v - > > 0 - 120v system where the 2x 120v's are 180 degrees out of phase. > > Between the 2 phases 240v is available for stoves, air conditioners > > etc. > > > In Australia, most separate homes have a straight single phase 240v > > supply, its not common for there to be 2,3 separate phases to the > > average house. Therefore the scenario Sylvia mentions is less likely > > to occur, as not many people have this multi phase system. > > > The exception here could be blocks of flats, if the main neutral to > > the building fails, and there isn't a good earth, the imbalance could > > be a risk. > > ** There is always a good "earth" available - courtesy of the water mains > in the street being linked to neutral at every premises. > > ..... Phil All new construction [last 30 years] around here uses iron mains with rubber sealed joints and plastic service pipe into all homes, so there is NO bond from the house to the main. The Gas main is plastic, as are the service drops. So, the only earth connection is the rather 'iffy' pair of 8' ground rods usually in the rain shadow of the roof overhang. Neil S.
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