Powerlines

From: Geoff Roberts <geoffrob_at_stmarks.pp.catholic.edu.au>
Date: Mon Apr 26 23:48:09 1999

----- Original Message -----
From: rws <rws_at_enteract.com>
To: Discussion re-collecting of classic computers
<classiccmp_at_u.washington.edu>
Sent: Tuesday, 27 April 1999 12:42
Subject: Re: Powerlines


> > Take a close look at rural areas and there is only 1 High voltage line
> > present.
> > It is fed to the HT input of all the pole transformers.

Same thing is done in rural areas in Oz. They are called SWR lines, which
is TLA for Single Wire Run AFAIK.
Not sure of the voltage, but I think it's around 8kv. (240v to subscribers)
They are somewhat unpopular, and are prone to surges and sags etc.
Given the nature of the return path, (ground) and the way it would be
affected by weather etc, this is not surprising.

'Normal' mains is delivered to subscribers elsewhere as a single (or two or
three - if they can justify it) active, neutral, ground.
IIRC, you are allowed a max of 80A per 240v phase. Need is based on
Lighting circuits being 8 amp, 1 single standard outlet _at_ 10A and a HD
outlet (for A/C's and the like) _at_15A. Stoves, Hot water and the like are
hardwired to their own circuit and fuse/breaker. Some large homes may need
2 phases, especially now as some of the SAA wiring regulations cut
drastically the number of outlets allowed on a single circuit. (Doesn't
affect existing installations of course) It's moderately difficult (not to
mention expensive) to get a proper 3 phase (415v) outlet installed, ETSA
(Electricity Trust of South Australia) simply won't do it unless you can
demonstrate you have a real need for it.

Cheers

Geoff Roberts
VK5KDR
Computer Systems Manager
Saint Mark's College
Port Pirie, South Australia.
Email: geoffrob_at_stmarks.pp.catholic.edu.au
           netcafe_at_pirie.mtx.net.au
ICQ #: 1970476
Received on Mon Apr 26 1999 - 23:48:09 BST

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