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RE: Garden automation


  • To: <ukha_d@xxxxxxx>
  • Subject: RE: Garden automation
  • From: "Dr John Tankard" <john@xxxxxxx>
  • Date: Sat, 18 May 2002 10:56:59 +0100
  • Mailing-list: list ukha_d@xxxxxxx; contact ukha_d-owner@xxxxxxx
  • Reply-to: ukha_d@xxxxxxx

> cat 5 in garden... lying on top of soil (exposed) 4 runs
> still working well forr cctv to summerhouse, 1 wire temps to
> greenhouse, right enough, it's only about 1.5 years out
> there...including running through puddles..
>

It does not mean that it will still be ok in 5 years, also consider the
other risks

The cable could become damaged, you may have a earth potential, even
with magnetics at either end you could still have problems (it there is
a local neutral fault you could have a potential lethal problem, (I have
seen near my house a wire fence with mains on it !)), you are also more
likely to suffer damage from a near lighting strike, I except that at
the summer house end you will still have a target, but its much smaller.

John

>
> ----- Original Message -----
> From: "James Hoye" <james.hoye@xxxxxxx>
> To: <ukha_d@xxxxxxx>
> Sent: Friday, May 17, 2002 10:17 AM
> Subject: RE: [ukha_d] Garden automation
>
>
> > > Regarding running cat5 outside, I know this has been mentioned
> > > before, but a quick yahoo search of archives didn't find it.
> > > Is there special outside cat5 cable? As I want to run some to a
> > > summerhouse.
> >
> > Try www.ukha-archive.com - much better.
> >
> > The main problem will be UV degradation of the cable
> jacket, assuming
> > you can safely run it in the first instance.
> >
> > If I were doing this, I'd dig an 18" trench, put 2" of gravel at the
> bottom
> > (for drainage), and lay a couple of runs of 40mm waste pipe (the
> > solvent weld type).  Use one run for SWA mains cable, and the other
> > for CAT5/LV. You may be able to 'borrow' some tape from a friendly
> > utility worker to
> lay
> > on top of the ducts - "CAUTION ELECTRIC CABLE BELOW" as it's only
> available
> > on 365m reels for 40 quid (well, from RS stock no.391-968).
> >
> > > Also to run mains to a pond for pump and lights and on to
> > > summerhouse
> and
> > > on to more lights....should I run a ring or a spur mains.
> > > I guess it may have to do with total power required?
> >
> > How far is the pond/summerhouse from the consumer unit?  This will
> > dictate the size of cable that you will need to lay.  Typically 2.5
> > sqmm will be
> OK
> > on a radial spur.  This should be protected by a 16A MCB and should
> > have
> RCD
> > protection.  If you whole house is RCD protected then you
> can just use
> > a
> 16A
> > MCB - but be aware that a fault on the garden circuit will
> plunge your
> whole
> > house into darkness.
> >
> > Many newer homes seem to have split load consumer units
> these days -
> > and
> if
> > this is your case then I would recommend taking the supply from the
> non-RCD
> > protected side, and using a 16A RCBO device (RS 425-3696) for
> > protection. This would mean that a fault on the garden curcuit will
> > only trip the RCBO device, not the rest of the house.
> >
> > <disclaimer>
> > Of course, the information I've given here is to the best of my
> > knowledge. Before using it, please check with the current IEE
> > regulations to ensure that what you are doing is correct and safe.
> >
> > The exact details will also depend on you circumstances - I've just
> outlined
> > a couple of points to get you started - I don't for
> instance know how
> > or where you intend to connect the pond devices. </disclaimer>
> >
> > James H
> >
> >
> >
> > For more information: http://www.automatedhome.co.uk
> > Post message: ukha_d@xxxxxxx > > Subscribe:  ukha_d-subscribe@xxxxxxx > > Unsubscribe:  ukha_d-unsubscribe@xxxxxxx > > List owner:  ukha_d-owner@xxxxxxx > >
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> >
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