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Electric Fencing Questions

 
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Squidge



Joined: 17 Dec 2007
Posts: 242
Location: Folkestone, Kent

PostPosted: Sat May 17, 2008 5:29 pm    Post subject: Electric Fencing Questions Reply with quote

I have been given some electric fencing and would like to ask members a few questions. The fencing is without a power source and I don't know how one sets it up. Also some of the netting has been chewed through and broken, how does one repair it? Also it is only 3ft high so a fox can jump over that can't he? Will he? Thanks in advance for your help.
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Henwife



Joined: 31 Jan 2006
Posts: 3414
Location: Monmouthshire

PostPosted: Sat May 17, 2008 7:51 pm    Post subject: Reply with quote

A fox could jump it, but they like to be able to 'touch' the top wire/rail etc of anything they clean jump and an electric fence is wobbly. They try to get through first and discover what it is, so aren't keen to touch it again. You'll need an energiser and a 12v Leisure battery to run netting. If the broken bits are the ones with the wire running through, you need to repair it with some more of the same. If it's just the vertical spacers, polypropyline (?sp) string is easier to work with than the plastic and is also non conductive. Somebody will give you advice on how powerful nan energiser you'll need. It depends on lengthe (usually 50m) and the number of live wires. They range from 15 downwards.
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Woodburner



Joined: 26 Jul 2007
Posts: 727
Location: Deepest Essex, well, a village...

PostPosted: Mon May 19, 2008 11:09 pm    Post subject: Reply with quote

I don't have any first hand experience and very little second hand even but a while back I did a lot of research into it. If your run is close to a mains power outlet, you can get energisers that run on mains rather than batteries, (well you only need one, but there are lots out there.) There is also wire for repairs to the electric lines. I recall something about the earth spike having to be a certain distance away, but can't remember the details.

Not all the wires are live they alternate live and neutral, so that foxy still gets a shock even if his feet are off the ground as they would be when he jumps.
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nigel
Moderator


Joined: 13 Apr 2005
Posts: 2468
Location: Skåne, Sweden

PostPosted: Tue May 20, 2008 6:29 am    Post subject: Reply with quote

Woodburner wrote:
Not all the wires are live they alternate live and neutral, so that foxy still gets a shock even if his feet are off the ground as they would be when he jumps.


On pre-made netting it is unlikely that this will be the case. The horizontal strands will all be live. There is usually only one connection at each end.

Mains power is less complicated, but we used 12v battery power for years with no trouble.

The number of earthing stakes depends on the length of your netting and the amount of power going through, for a single 50m net one should suffice.

You can get netting repair kits to repair the broken sections
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Woodburner



Joined: 26 Jul 2007
Posts: 727
Location: Deepest Essex, well, a village...

PostPosted: Wed May 21, 2008 8:44 am    Post subject: Reply with quote

Flipping heck! I've just checked and you're right. How daft can you get? (The suppliers, not you. Smile )
The whole point of having so many wires is so that foxy will get zapped whatever height he tries to breach the net at, even if he's jumping/climbing and that won't happen if only the bottom wire is earth. Brick wall Rolling Eyes

Edit: Alternate wires need to be earth all the way up the fence.

Also blue emphasis added.

Link to the defra manualAdded
Page 24 has the specification for keeping foxes out.
Page 2 shows the bottom wire as earth return wire


Last edited by Woodburner on Fri May 23, 2008 11:43 am; edited 3 times in total
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Sparklepeeps



Joined: 17 Jan 2007
Posts: 1955
Location: Cheshire

PostPosted: Wed May 21, 2008 10:00 pm    Post subject: Reply with quote

Squidge, I dont know how to fix chewed electrical fencing. But I do remember someone asking about where to buy an electric fence repair kit a few months ago.

One of the familiar crew offered to send a spare repair kit they had hanging around... was that CP? I cant find the original thread, which is a shame as that might have pointed you in the direction of someone with experience of repairing one.

Have you got any further with the fence yet?
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Itsybitsy



Joined: 11 Feb 2006
Posts: 1426
Location: Leicestershire

PostPosted: Wed May 21, 2008 10:20 pm    Post subject: Reply with quote

Woodburner wrote:
so that foxy still gets a shock even if his feet are off the ground as they would be when he jumps.


He wont get a shock if his feet are off the ground. They need to be touching ground so the electric goes to earth.

Itsybitsy
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nigel
Moderator


Joined: 13 Apr 2005
Posts: 2468
Location: Skåne, Sweden

PostPosted: Thu May 22, 2008 6:26 am    Post subject: Reply with quote

Woodburner wrote:
Flipping heck! I've just checked and you're right. How daft can you get? (The suppliers, not you. Smile )
The whole point of having so many wires is so that foxy will get zapped whatever height he tries to breach the net at, even if he's jumping/climbing and that won't happen if only the bottom wire is earth. Brick wall Rolling Eyes


The bottom wire isn't earth, the bottom wire is unconductive so it doesn't short the whole thing out. You run the earth to a stake hammered into the ground - see picture - and then when a fox [or cow in this case] touches the fence he completes the circuit.

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Woodburner



Joined: 26 Jul 2007
Posts: 727
Location: Deepest Essex, well, a village...

PostPosted: Fri May 23, 2008 10:34 am    Post subject: Reply with quote

Itsybitsy, you missed this bit:
Woodburner wrote:
and that won't happen if only the bottom wire is earth. Brick wall Rolling Eyes



Lots of alternate wires, live and earth make sure that foxy gets zapped even if he tries jumping/climbing. There's not much point having lots of wires if they are all live, as once his feet have left the ground they won't shock him. You need earth wires too.
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nigel
Moderator


Joined: 13 Apr 2005
Posts: 2468
Location: Skåne, Sweden

PostPosted: Fri May 23, 2008 11:56 am    Post subject: Reply with quote

I use the standard netting and have never had a fox breach a net that is powered up. It is my experience that foxes come in nose first to investigate before attempting to jump. Once they've hit the netting and been zapped they tend not to try again.
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Woodburner



Joined: 26 Jul 2007
Posts: 727
Location: Deepest Essex, well, a village...

PostPosted: Fri May 23, 2008 12:18 pm    Post subject: Reply with quote

nigel wrote:
Woodburner wrote:
Flipping heck! I've just checked and you're right. How daft can you get? (The suppliers, not you. Smile )
The whole point of having so many wires is so that foxy will get zapped whatever height he tries to breach the net at, even if he's jumping/climbing and that won't happen if only the bottom wire is earth. Brick wall Rolling Eyes


The bottom wire isn't earth, the bottom wire is unconductive so it doesn't short the whole thing out. You run the earth to a stake hammered into the ground - see picture - and then when a fox [or cow in this case] touches the fence he completes the circuit.



It can be earthed, might just as well be earth and in page 2 of the DEFRA manual the bottom wire is labelled 'earth return wire' and is earthed, so pardon me for just saying 'earth' and not quoting the supplier "is not live to prevent shorting with vegetation." I was trying to keep it simple Rolling Eyes

Earth wires making contact with the ground won't complete the circuit. After all they are connected to the earth, hence the name, so my statement is actually correct, even if the manufacturers do say the bottom wire "is not live . . ." So my statement is actually correct even though it doesn't address the alternate earthing as it was originally meant to. I cut too much out when I originally posted.

While we are on the subject of accuracy your statement "The bottom wire isn't earth, the bottom wire is unconductive so it doesn't short the whole thing out. " is wrong. It may or may not not be earth but it's definitely not unconductive. Wire is, by it's very nature, conductive. The important thing is that it is not live, as that really would short out the whole caboodle. Shocked bom
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stephen
Site Admin


Joined: 13 Apr 2005
Posts: 5177
Location: Billinge, Skåne, Sweden.

PostPosted: Fri May 23, 2008 12:37 pm    Post subject: Reply with quote

The bottom wire is pure polypropylene. No wire at all. It's therefore non-conductive. That's on both our nets from the UK and our German supplied nets.
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