RE: Garden automation

["Dr John Tankard" <john@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
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> >
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