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Electric Fence

 

First of: planning!
This will save you unneccsary cost and time.
Make a drawing and see the calculations below.

Select your energizer
There are various energizer models, same thing.
With even the more powerfull energizers the voltage setting can be set to high or low voltage.
For normal domestic applications - 30m x 30m use like the 5J energizers - 5 to 6 strand fences
If it is only a small distance - use even the smaller energizers.
When getting to 8 strand plus, get the large energizers. The wire distance is adding up.

Keypad or without keypad?(magnet or key)
Think of this, your fence alarm is activated in the middle of the night, are you prepared to go outside ie your garage and reset the siren and see whats going on? - NO, unless you are a trained armed guard


Fit a keypad somewhere in your house ie kitchen or so.
You can see the status and arm/disarm from there.


Deciding on fence poles to use?
There, use logic.
Do not put a 8 strand fence on your precast wall, it will petrude into your neighbours yard and they can give you notice to remove them.

Most often use 6 strand whether wall top, angle or staight brackets.
Use 8 stand square tube poles for high or double walls and wider.
Precast walls most often wall top 5 or 6 line

Do not fit them where children can easilly reach the wires.
Wall or fence must be 1.5m and higher to fit electric fence onto
The live wires must be at least 1,8 m above the level of natural ground at any point.
Never fit them in public space!

Spacing of brackets are around 3 meters appart

Use at least 60mm nail anchors for flatbar and 80mm for tubing brackets to secure to wall.

What about Gates?
You will need a series gate contact, your gate will be looped and more secure than a single contact.
We recomend using the heavy duty gate contact from Nemtek
Planning for conduit under the gate - repeat use conduit pipes and seal them with PVC glue.
This must be kept water proof.
Use the undergate wire - 3 x strands.
So if your gate is 4meters long, wall 2m high; you will need (4m+2m+2m+ 1m min cutoff) x 3 = 27 meters min undergate wire.

Also consider undergate wire from the energizer up to the fence - same calculation.
Undergate wire for earth spikes = 1 wire
So a 100 meter roll undergate wire in most cases will be enough.

In some instances this under gate wiring is not required as the fence is around entire property.

What wire to use?
Up to you.
We recommend using stainless steel - will outlast other types
There is also galvanized and aluminum wire(all inland use)

For aluminum wire be careful, you need to use aluminum ferrules and undergate wire. Do not mix other metal tipes in contact with aluminum, corrosion and arc will take place fast.

Earth spikes?
The start of your fence fit 3 already closest to energizer - 1m then 2meter then 3meter
Then spaced every 30 meters max, more earth spikes can be used
Do not use the house earth or within 10m of the house earth spikes!

Springs and so?
Up to you.
The mini tweaker we reccomend. Should your fence wires get some slag after time, just tension it again with the tweaker tool. Other tensioners you cannot do this.
Remember springs requires spring hooks.

Warning signs?
Every gate and entrance 
Not more than 10 meters appart

Wiring and looping?
Lets say your fence is perimeter is 30m x 20m x 30m x 20m and 6 lines, to calculate the distance wiring - (30m + 20m + 30m + 20m) x 6lines = 600 meters total, add some cut off material and loops 700meters wire. 
So a 8Kg roll(8kg = approx. 1080meters) will be enough to do this fence .

Use ferrules and crimp the connections
Try and stay away from line clamps and so

Always wire the fence in series, do not just loop the live wire to all wires, this way will be defeating the purpose and functionality of your fence.

Think of it as a water pipe: if you open the tap(energizer) the water must flow from one side to the other side - looped to next pipe and flow back. This continues until it flows back to the energizer return.

On a 5 line fence you will have one earth wire
On a 6 line two earth wires - this can also be loopped for enhanced security.

Stay poles?
The stay poles is attached to the fence brackets and prevents the fence once the wires is tightened to pull the brackets out of place.
Every corner, or where fence starts and ends needs to have a stay pole.
600mm stays for 5 and 6 line, then 750mm for 8 line is required.
Add two lugs for every stay pole
Roundbar brackets requires 1 x pole clamp and 1 x lug

Do not overtighten your fence wires, the pull force is combined for all the strands
Start with the top line and work your way down

If not sure, find a neighbour and have a look first.

Last thing, your fence will require an installation COC to be electrical compliant.
You will need a qualified electrician to give you this certificate.

Fault finding
Always visually inspect all wiring, there are no other easy way.
This needs to be done at a slow pace, missing one fault will leave you frustrated.
Use your hearing as well, listnen for arc's

Use a fence scope for larger fences or quick fault finding.
Once you are absolutely sure the fence wires is correct then check energizer.

To check: Switch off energizer, mark and disconnect the V-out and V-return wires completely from energizer.
Then take a small piece of wire and place accross the V-out and V-return terminals.
Switch on energizer

Is the fence energizer working correct now?
If Yes - fault still on fence wiring - getting earth somewhere, loops not correct
If No - repair or replace energizer

Always, when doing fence repairs, switch off the energizer when working near the wiring.

Download a manual for the SANS regulations here

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