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Forum Index : Other Stuff : Electric fence+solenoid supply-induction?

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domwild
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Joined: 16/12/2005
Location: Australia
Posts: 873
Posted: 10:39pm 27 Apr 2017
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Hi,

At the moment my electric fence cable and my 24VAC cable run separately, but I would like to run them together.

Question: Could the 5,000V (?) pulses for the electric fence upset the water valve solenoid via induction or can I just have them run together to the same place from the garage?

Thanks.
Taxation as a means of achieving prosperity is like a man standing inside a bucket trying to lift himself up.

Winston Churchill
 
rustyrod

Senior Member

Joined: 08/11/2014
Location: Australia
Posts: 121
Posted: 11:14pm 27 Apr 2017
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I had a genuine electric fence insulated single wire cable through a length of 1" poly water pipe buried under a gate way, eventually (8 or 9 years) the electricity got through both and reduced the spark on the fence.
The pipe was dry inside for some time with the ends doubled back down above the ground.
I expect condensation eventually helped to do the damage.

Also had mains 7x036 double insulated cable buried directly and it also eventually failed.
So I found the sneaky sparks eventually got out.

My mains unit was a special impedance unit that would work in wet high crop.

Are you running them under ground? if so -
Maybe if you have individual orange conduit you may get away with them in the same trench.
I have NEVER seen a underground electrical conduit that has not had plenty of water in it.
At least the poly pipe has no joins.

Then I had some aluminium cans on top of some posts - these would click with the pulses enabling me to know if the fence was working.

The horses knew instantly when the fence was off too, when the cans stopped and they were through in a flash and i knew the fence was not working when they came and told me !
Always Thinking
 
Boppa
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Joined: 08/11/2016
Location: Australia
Posts: 814
Posted: 11:59pm 27 Apr 2017
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The problem is most electric fences are between 8kv and 10kv, most insulated wires are nowhere near good enough to survive this long term.
There are specialist HV cables that can survive these high voltages, they are difficult to find and are $$$

Best stuff to use is copper cored spark plug cable and put it in polypipe, I put in some back in the late 90's and its still running fine, the insulation is rated to handle the high voltage (note if your are looking for suitable cable from cable suppliers, they actually will be sold as Medium Voltage cables (ie up to 10kv) and 240vac stuff is actually sold as Low Voltage cabling!!)

purely as examples first 2 on google, no affiliation with either company

https://www.telematica-au.com/product/ACC-0422/ACCEL-Performance/160090/Spark-Plug-Wire-Roll-Yellow-Super-Stock-Copper-C ore-7mm-30meters


http://www.ebay.com/itm/Taylor-Cable-Spark-Plug-Wire-Pro-Wire-Solid-Core-8-0mm-Black-30-ft-Length-Each-/331364345009

Note- you MUST use copper cored sparkplug wire- NOT carbon cored, as used in most cars- this will reduce your `kick' and voltage dramatically, the copper cored stuff is used on race engines etc where radio interference isnt an issue...
 
Boppa
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Joined: 08/11/2016
Location: Australia
Posts: 814
Posted: 12:19am 28 Apr 2017
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As regards running them together- I would strongly advise against it, elec fence wiring should be kept as far away as possible from all other wiring including 240v wiring and phone lines- if it must run close to any others, try and cross the other wires at 90 deg and them run away from the others as far as possible
The electric fence will induce pulses in any other nearby wiring and any parallel wiring will act as an antenna, we had pulses on the phonelines even though the electric fence was over 30ft away from the phoneline and the phone was buried

IF you have to share the trench, I would advise running either or both in either suitable shielded cables, preferably inside earthed metal tubing (eg 10kv electric cable inside polytube inside a continuous copper water pipe tubing buried in the trench, put in a bit of dirt to cover then do the same with solenoid wires, run em in poly inside copper and then bury it as well, making sure neither is touching anywhere

Its possible that the spike from the fence controller could induce spikes on the solenoid cabling enough to possibly damage the water solenoid controllers electronics if they are run side by side in the same trench for any distance parallel to each other
 
domwild
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Joined: 16/12/2005
Location: Australia
Posts: 873
Posted: 12:18pm 28 Apr 2017
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Thanks for the many warnings.

Will definitely run them separately and as far away as possible.
Taxation as a means of achieving prosperity is like a man standing inside a bucket trying to lift himself up.

Winston Churchill
 
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