Why not turn off power grid one hour before hurricane sandy ?

[Jasen Betts]

On Nov 1, 6:19 pm, Jim Thompson <To-Email-Use-The-Envelope-I...@On-My-
Web-> Most modern day (built in the last 40+ years) residential areas
in

If corrosion underground is that bad in Phoenix
then it would be absurd in most other places,
or is the soil pH in Arizona making it worse?

The solution is fairly simple. use a cable with plastic sheath over the armour

I think old cables used tar

 

[Cydrome Leader]

[email protected] laid this down on his screen :

The medium voltage network has to be the same size, it is just that
there are fewer, maybe half as many, transformers in the 230/400volt
countries.

they make up for the lack of transformers with piles of electrocuted
bodies in places with dangerous voltages to the home.

 

[Cydrome Leader]

Cydrome Leader pretended :

Nonsense.
We are more careful than that.

they aren't in europe.

It appears our deaths by electrocution is a bit lower than the USA.

And a lot of US machinists would love to get 3 phase to their workshop.
Almost anyone can get good clean 3 phase 400 volts here in Aus.

3 phase isn't rare in the US at all. Is it something run to home? no,
because there's no need for it.

 

[[email protected]]

On Sat, 3 Nov 2012 21:04:29 +0000 (UTC), Cydrome Leader

they make up for the lack of transformers with piles of electrocuted
bodies in places with dangerous voltages to the home.

In Finland there are 0-5 fatalities electrocution each year
(population over 5 millions) including all voltages. Half of this
happens to professionals, often with 20 kV medium voltages, lorry etc.
drivers hitting overhead lines. Some have been killed by climbing on
stationary trains and electrocuted by 25 kVac.

I counted less than a dozen fatalities at home from 230/400 V during
the whole beginning of this century.

 

[josephkk]

sure, buried cables are built that way.

Only problems with buried power is accidental excavation.
earthquakes, and other underground disasters (sinkholes, landslides etc)

I have seen applications where "backhoe fade" was the number one failure
mode in both frequency and severity.

?-)