Re: Garden automation

["Campbell Macdonald" <campbell@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..

Campbell
----- 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
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