On Nov 24, 12:40 pm, "Phil Allison" 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


That is true in a lot of cases, however I have noticed with a lot of
newer houses, (in QLD anyway) they are using some kind of either black
or grey pvc or poly pipe for home water mains. To make it worse, it
looks to me to be "crimped" together at joins, sometimes with what
look like soft metal rings but not always.

Copper or the old cast iron pipes would provide an excellent Earth,
and excellent soil electrical contact due to the enormous surface area
of the water main in contact with the soil over distance



Mine is all copper, all the way back to the water main, so no problems
here.