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#148090 - 07/04/03 07:37 PM Side-of-the-Road Pit Stop Leads to Electrocution  
ThinkGood  Offline
Member
Joined: Aug 2002
Posts: 1,081
Milwaukee, WI
http://www.news.com.au/common/story_page/0,4057,6699117^1702,00.html


Arc Flash PPE Clothing, LOTO & Insulated Tools

#148091 - 07/04/03 09:33 PM Re: Side-of-the-Road Pit Stop Leads to Electrocution  
Trumpy  Offline


Member
Joined: Jul 2002
Posts: 8,211
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!. [Linked Image]


Let's face it, these days if you're not young, you're old - Red Green grin

#148092 - 07/06/03 09:58 AM Re: Side-of-the-Road Pit Stop Leads to Electrocution  
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
Presumably there was some current flowing to ground on that "uncovered ground line." A tragic demonstration on voltage gradients.


#148093 - 07/06/03 01:38 PM Re: Side-of-the-Road Pit Stop Leads to Electrocution  
resqcapt19  Offline
Member
Joined: Nov 2000
Posts: 2,148
IL
Was this a single wire earth return system?
Don


Don(resqcapt19)

#148094 - 07/06/03 06:45 PM Re: Side-of-the-Road Pit Stop Leads to Electrocution  
Bjarney  Offline
Moderator
Joined: Apr 2002
Posts: 2,527
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.
 
http://electrical-contractor.net/ubb/Forum1/HTML/001230.html
http://electrical-contractor.net/ubb/Forum1/HTML/002442.html




[This message has been edited by Bjarney (edited 07-07-2003).]


#148095 - 07/12/03 12:47 AM Re: Side-of-the-Road Pit Stop Leads to Electrocution  
Trumpy  Offline


Member
Joined: Jul 2002
Posts: 8,211
SI,New Zealand
Bjarney,
Over here, that current is a maximum of 8 Amperes, it's normally a lot lower than that though!. [Linked Image]


Let's face it, these days if you're not young, you're old - Red Green grin

#148096 - 07/12/03 02:02 PM Re: Side-of-the-Road Pit Stop Leads to Electrocution  
Bjarney  Offline
Moderator
Joined: Apr 2002
Posts: 2,527
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.


#148097 - 07/12/03 07:57 PM Re: Side-of-the-Road Pit Stop Leads to Electrocution  
Trumpy  Offline


Member
Joined: Jul 2002
Posts: 8,211
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. [Linked Image]


Let's face it, these days if you're not young, you're old - Red Green grin

#148098 - 07/19/03 03:50 AM Re: Side-of-the-Road Pit Stop Leads to Electrocution  
Trumpy  Offline


Member
Joined: Jul 2002
Posts: 8,211
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!!. [Linked Image]


Let's face it, these days if you're not young, you're old - Red Green grin


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