Shocking, quite quite shocking.

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d000hg replied

16 October 2009, 14:56
Originally posted by NotAllThere View Post

Notwithstanding the physical effects of hitting the cable at 90mph, the line being live is irrelevant, as a car is a faraday cage.

People getting out of their cars to help those in accidents is a big risk.
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NotAllThere replied

16 October 2009, 14:31
Originally posted by zeitghost

Depends.

I'm not a power line expert, but looking at that, the wire isn't grounded, it's about 4 feet off.

Thus the power probably remains on.

Zzzzzzzzzzzzzzzzzzzzzzap!

Notwithstanding the physical effects of hitting the cable at 90mph, the line being live is irrelevant, as a car is a faraday cage.
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DaveB replied

16 October 2009, 14:24
Originally posted by zeitghost

Depends.

I'm not a power line expert, but looking at that, the wire isn't grounded, it's about 4 feet off.

Thus the power probably remains on.

Zzzzzzzzzzzzzzzzzzzzzzap!

Used to work with a guy who was an ex-leccy board line man. According to him the standard approach was always to assume the line was live until you had proved otherwise. This usually involved the use of a voltage detector on the end of a very long perspex pole. he was still alive and had never been "bitten" so I assumed he knew what he was talking about.
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Spacecadet replied

16 October 2009, 14:21
Power on or not, those cables would do a fair bit of damage if you hit one at 70mph
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gingerjedi replied

16 October 2009, 14:16
I wonder what that cost the economy? Must be many millions?

All cos some dozy builder flipped his pick-up whilst on the phone no doubt, well I hope he's proud of himself.
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bogeyman replied

16 October 2009, 14:15
However, the power cable presents a hazard to any motorists and in the interests of public safety the decision was taken to close the road.

I thought they shut themselves off if they were suddenly grounded - or at least were shut off by the distribution centre pretty sharpish if there was a problem.

You're the electrical boffin Zeit. Could HT transmission lines remain live and on the floor?

Perhaps they mean it's a physical hazard rather than electrical.
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gingerjedi replied

16 October 2009, 14:12
That's why I'm sat at home earning £0 today.
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zeitghost started a topic Shocking, quite quite shocking.

16 October 2009, 14:10
Shocking, quite quite shocking.

http://news.bbc.co.uk/1/hi/england/bristol/8310030.stm

As if plod ever miss an opportunity to close a motorway.
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