Supply voltage to overhead 240V mains wiring transformer

[Huge]

Went out for a walk this morning & the relevant gubbins is all here;

[Dave Liquorice]

A 9 V battery has the capability to kill if well enough connected to you.

"It's volts that jolts, mils that kills"

"mils" being short for milliampere.

[Ash Burton]

The 11kV/240v transformer supplying my house has a 2 wire supply on the

11kV side of it, this is teed off a 3 wire 11kV line a few poles away.

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[Ash Burton]

When i worked in the ESI voltages were calssified approximately thus;

230kV EHV

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[NY]

I imagine that to be "well enough connected" it needs to be via open wounds that penetrate the epidermis and maybe even dermis, and get right to muscle.

I wonder what voltage is used by internal paddle-defibrillators and other "jump start" devices for restarting the heart in open-chest heart operations. Probably not much compared with those that are applied to the outside of the chest.

Apparently I had many Joules of the latter (as well as many mls of adrenaline and many many chest compressions) when I suffered a heart attack and cardiac arrest four years ago. I have no memory of it! But it did some good because I'm still here and, despite my heart having no pulse for about

90 mins and CPR being the only "pulse" that my body had until A&E got me going again, I suffered no (discernable) brain damage - but then would they be able to tell? :-)

A woman I was at university with was able to "feel" voltages as low as a couple of volts with her fingers and was much in demand for her laying-on-of-hands technique in the lab for feeling circuit boards to tell which tracks were live, as an alternative to using a voltmeter!

[Andrew Gabriel]

Like a long row of HID streetlamps running along a motorway. (3rd harmonic adds in 3-phase neutral, rather than canceling out.)

Some years back, a kid got into a substation at the end of a 275kV overhead line, and thought it would be OK to unbolt the earth wires coupling the last pylon to ground. It seems that as the last one was unbolted, the pylon floated up to many kV above earth, and fried him. So real earth wires are not safe to disconnect either.

[tony sayer]

Now if that'd been thee or me they'd have seized bloody solid and we'd have needed a long bar spanner or an impact wrench to undo them!.

Um... point of order .

Don't all pylons have an earth wire along the top so that they use more than the one earth to ground. After all a lightning strike isn't going to nip along miles of wires until it finds an earthed pylon is it?......

[tony sayer]

Not at all theres quite a few of them around out in the fens two wire run off three wires...

More the latter I'd reckon.

They do use that technique on the railways to boost the 25 kV overhead in parts...

>

[Andrew Gabriel]

Well, maybe it was rather more bonding. I presumed it was the bonding you see linking all the metal supports and switchgear together, although the report at the time specifically said it was the pylon he was disconnecting.

[Vir Campestris]

Not connected to you, connected _into_ you. You'd have to try pretty damn hard to get enough out of a 9 volt without sticking electrodes through the skin. And even then you'd probably have to place your electrodes near the heart.

Unless of course you have a reference...

Andy