Electric fences

[underpar12]

Had a call today from a golf club, wanting me to investigate a drop in voltage on there fences around the greens ,the fences are feed from a time clock back at the club house. I have not visited as of yet but could do with some useful info when I get there.

 

[davesparks]

Earthing. HV fences should be earth rodded every so many meters (see manufacturers instructions.) Also those multiple LED fence indicators aren't accurate you need something more like this http://www.instrumentsgroup.co.za/index_files/T+M/T+Mspecs/Scope-A-Fence.pdf

How does rodding them every few metres work? What do you connect the rod to ?

 

[Simon-0116]

Just get hold off it. This was a friends dads party trick. Hands like shovels thick skinned dairy farmer could hold all 3 wires battery or mains powered. Every one else first crack on your knees shaking.

 

[Marvo]

How does rodding them every few metres work? What do you connect the rod to ?

Not every few meters, usually every 50-100 meters. Depends on local ground conditions.

 

[davesparks]

Right I see, I've not seen a fence with an earth wire before, hence my confusion.

In all my research and limited experience on them I've only ever come across systems with all wires live and the ground itself being used to complete the circuit. So the only earth rod is the one connected to the controllers output earth.

 

[Marvo]

Maybe the laws or just the equipment is different in the UK, most of the fences here, both agricultural and domestic/commercial security, are multiwire with alternating ground and HT. Most manufacturers recommend rods along the fence every 50 or 100 meters (obviously as well as rods at the control unit), some just stipulate a maximum touch voltage on the earth wires when they're shorted to the HT wires because that's what adversely affects the integral RS-232/485 comms between controllers. In this case you add rods accordingly to achieve their required figures under short conditions.

I've seen single wire systems elsewhere in Africa but they were very primitive agricultural fencing, I doubt they'd install that type at a golf course.

 

[eddieboy]

Is it battery or mains operated. I would imagine mains.

My experience is with both horses and chickens. :juggle2:

 

[guest119]

Is it battery or mains operated. I would imagine mains.

My experience is with both horses and chickens. :juggle2:

There are a few on here more than just experienced, with sheep!

 

[PEG]

Maybe the laws or just the equipment is different in the UK, most of the fences here, both agricultural and domestic/commercial security, are multiwire with alternating ground and HT. Most manufacturers recommend rods along the fence every 50 or 100 meters (obviously as well as rods at the control unit), some just stipulate a maximum touch voltage on the earth wires when they're shorted to the HT wires because that's what adversely affects the integral RS-232/485 comms between controllers. In this case you add rods accordingly to achieve their required figures under short conditions.

I've seen single wire systems elsewhere in Africa but they were very primitive agricultural fencing, I doubt they'd install that type at a golf course.

Marvo,i think your fences are more "Jurassic Park",and ours are a bit "Chicken Run" :icon12: Best test is to pee on it...if it feels like both your kidneys have been IR tested.....it's OK