Re: Edinburgh Waverley station improvements

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Article #89

#89

From: Matthew Geier
Date: Wed, 05 Apr 2006 20:05

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On Tue, 04 Apr 2006 21:53:10 +0100, David M wrote:

> It's just a much rather smaller gap than I would have
> expected. I was under the impression that the safe distance from these
> kind of high voltages was a good couple of metres.. (not that I intend
> putting it to the test either way). I'm just very surprised that the
> safe gap is quite as small as that: I presume they wouldn't allow
> repainting of the footbridge girders with the power on, though!

 The 'safe working distances' from power lines are a combination of the
length of an arm holding a tool of some sort AND the arc-over distance.

 So the 25kAC overhead line can pass quite close to a metal (earthed)
bridge structure and be perfectly safe - all you are interested is the
flash-over distance, and you could say aid this by bolting a plastic sheet
to the underside of the bridge where the wires pass to run the wires even
closer.

 The moment some one has to work next to it, it's a different ball game.
People have arms and carry tools.
 The 30cm 'safe' distance between the wire and the bridge becomes over a
metre. You need to ensure that when said worker waves their arms around,
that the end of what they are holding doesn't cross into the zone where
the voltage will arc over to them...

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From: Matthew Geier <matthew@wibble.sleeper.apana.org.au>
Newsgroups: scot.general,ed.general,free.uk.scotland.transport-railways,uk.railway
Subject: Re: Edinburgh Waverley station improvements
Date: Thu, 06 Apr 2006 06:05:49 +1000
Organization: Core Matrix Foundation inc. ORBnet
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