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#148090 - 07/04/03 04:37 PM Side-of-the-Road Pit Stop Leads to Electrocution
ThinkGood Offline
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Registered: 08/07/02
Posts: 1084
Loc: Milwaukee, WI
http://www.news.com.au/common/story_page/0,4057,6699117^1702,00.html
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Arc Flash PPE Clothing, LOTO & Insulated Tools
#148091 - 07/04/03 06:33 PM Re: Side-of-the-Road Pit Stop Leads to Electrocution
Trumpy Offline


Member
Registered: 07/05/02
Posts: 8560
Loc: SI,New Zealand
ThinkGood,
It's not the way that I want to leave this Earth!.
Makes you think though, about your next pit-stop at the side of the road, at night, of course!.
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Let's face it, these days if you're not young, you're old - Red Green grin
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#148092 - 07/06/03 06:58 AM Re: Side-of-the-Road Pit Stop Leads to Electrocution
pauluk Offline
Member
Registered: 08/11/01
Posts: 7693
Loc: Norfolk, England
Presumably there was some current flowing to ground on that "uncovered ground line." A tragic demonstration on voltage gradients.
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#148093 - 07/06/03 10:38 AM Re: Side-of-the-Road Pit Stop Leads to Electrocution
resqcapt19 Offline
Member
Registered: 11/10/00
Posts: 2209
Loc: IL
Was this a single wire earth return system?
Don
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#148094 - 07/06/03 03:45 PM Re: Side-of-the-Road Pit Stop Leads to Electrocution
Bjarney Offline
Moderator
Registered: 04/10/02
Posts: 2561
Loc: West-Southern Inner-Northeast ...
Don, SWER is a seemingly bizarre practice by typical US standards, but has a decent track record for some. First saw it in southern Alberta in the late ‘70s. There, it was typically limited to a 15kVA transformer for rural farmhouses served at 14.4kV, with annual(?) ground-resistance checks. That corresponds to a transformer-primary/ground-electrode current of about 1 ampere, FWIW.
 
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[This message has been edited by Bjarney (edited 07-07-2003).]
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#148095 - 07/11/03 09:47 PM Re: Side-of-the-Road Pit Stop Leads to Electrocution
Trumpy Offline


Member
Registered: 07/05/02
Posts: 8560
Loc: SI,New Zealand
Bjarney,
Over here, that current is a maximum of 8 Amperes, it's normally a lot lower than that though!.
_________________________
Let's face it, these days if you're not young, you're old - Red Green grin
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#148096 - 07/12/03 11:02 AM Re: Side-of-the-Road Pit Stop Leads to Electrocution
Bjarney Offline
Moderator
Registered: 04/10/02
Posts: 2561
Loc: West-Southern Inner-Northeast ...
Mike, at the time I spoke to an engineer at the utility in Calgary who explained that a government inspector required periodic {annual or ?} tests of ground resistance at the remote end. The utility would also run a span between the last two poles {at the remote 15kVA pot} and bond ground electrodes at both poles, for reliability’s sake.
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#148097 - 07/12/03 04:57 PM Re: Side-of-the-Road Pit Stop Leads to Electrocution
Trumpy Offline


Member
Registered: 07/05/02
Posts: 8560
Loc: SI,New Zealand
Bjarney,
That sounds like a real good idea!.
The main down-fall of SWER systems, is what would happen if the Earthing is faulty.
It's best to have as lower Earth resistance as possible.
_________________________
Let's face it, these days if you're not young, you're old - Red Green grin
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#148098 - 07/19/03 12:50 AM Re: Side-of-the-Road Pit Stop Leads to Electrocution
Trumpy Offline


Member
Registered: 07/05/02
Posts: 8560
Loc: SI,New Zealand
Bjarney,
ECP 31, over here calls the need for tests to be performed at 9 monthly intervals.
The test value shall be less than 2000 ohms(?!).
This value seems awfully high!!.
_________________________
Let's face it, these days if you're not young, you're old - Red Green grin
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