Common Electric Fence Mistakes

Common Electric Fence Mistakes

While doing repairs and generally driving around the Lowveld we have noted a few common mistakes made when electric fences are installed.  These electric fence mistakes are made by installers who are not properly trained, and which mistakes will impact negatively on your electric fence’s performance.  Finally, it is also these common electric fence mistakes which make people believe that electric fences do not work.  (Have a look at our “Do electric fences work?”  Articles,,


Here are the most common electric fence mistakes.

The bridges are built wrong, so that your electric fence is not really in series or parallel.

This is a bit of a technical issue, which we’ll be happy to explain to you on site, but basically it means instead of having a proper security fence or a proper gaming fence, you have neither. 

HT cables are installed in polyethlene pipes (poly pipes) instead of proper PVC conduit and pipes are not sealed.

These poly pipes are soft and flexible and do not provide proper protection for your HT Cable when you bury it.  The HT Cable is the cable which connects your energizer to your electric fence and as such must be properly protected.  Additionally, if the pipes protecting the HT cable are not sealed, when it rains water will accumulate in your pipes and this will cause your 8,000 volts cable to be submerged in water. Obviously, this is a terrible idea.    

There are not enough earth spikes for the length of the fence.

If you do not have enough earth spikes for your fence, your fence will not be properly earthed.  The electric shock of a fence which is not properly earthed will not be as painful as the shock from a properly earthed electric fence and therefore your deterrent of an electric fence is severely minimised.  There are several other technical issues, which again, we’ll be happy to share and explain on site, (i.e. induction, capacitance, etc.)

There are no lightning diverters.

This is a COC requirement and as it is not an expensive part of the fence, we always install it to try and minimise the risk to your energizer.  Your energizer is the most expensive equipment of your electric fence, so it is well worth doing what you can to try and protect it. 

In order to obtain a COC many fences (especially free-standing fences) require a barrier fence.

This is a source of great contention between installers, complexes/estates and the Electric Fence Regulators and needs an article on its own (which will be published in due course).  In the meantime, if you have any questions, we’ll be happy to answer them on site. 

There you go:  now you also know the basic mistakes which we see too often.  The customer, who has no technical knowledge is completely in the hands of his/her installer and we therefore urge you to ensure your hard-earned money is not spent on a fence that cannot do what you need it to and what you’ve paid for.

Contact us now for your free quote in Nelspruit, White River, Barberton, Lydenburg, Hazyview, Sabie and Witbank on 074 104 6028 / /

11 November 2019, Nelspruit Fencing (Pty) Ltd, Mbombela, Mpumalanga

Security cameras – how do you know what you need?

Security cameras – how do you know what you need?

How do you know which security cameras to choose for your CCTV Surveillance System?  After all, there are many options to choose from.  Notably, one of the features to consider is the lens performance criteria of your security camera.  The lens size is directly linked to the reason you are installing a CCTV Surveillance System.

To clarify, the reason for your security cameras is for either, Detection, Observation, Recognition or Identification of the persons your camera can see.  Below is what each purpose means in terms of security cameras. 

  • Detection:  Meaning you will be able to detect movement in the area the camera is capturing. 
  • Observation:  Meaning you will be able to observe how people, animals or other objects are moving around in the area the camera is capturing.  This camera lens size is usually used in public parking spaces.    
  • Recognition:  Meaning you will be able to recognise a person you already know when you see him/her in the area the camera is capturing.    
  • Identification:  Meaning you will be able to identify strangers and read number plates on cars. 

It is very difficult to set a permanent rule saying an x mm lens automatically means you can identify up to y metres.  Due to the fact that there are other factors which impact on the distance of detail your security camera can see.  For example, the angle of installation will impact the distance of detail.  Also, a big lens which can identify at a large distance, may not be able to focus on something right in front of it.   Therefore, it is not enough to simply say you want a big lens. 

Obviously, the bigger your lens size, the more expensive your security camera.  Consequently, you need a professional company to provide you not only with the various options, but also to take the time to properly assess your site.  Nelspruit Fencing (Pty) Ltd will make recommendations to you so you, as the Customer and home or business owner, can make an informed decision regarding your needs.

Contact us for your free site assessment and quote in Nelspruit, White River, Barberton, Lydenburg, Witbank and Hazyview at 013 742 0004 / /

April 2019, Nelspruit, Mpumalanga

“Know Your Products”: Security Electric Fences – 5 or 6 lines?

You, as consumer, are faced with so many options of electric fencing products, we at Nelspruit Fencing (Pty) Ltd decided to launch a series of articles called “Know Your Products”.

This is the first “Know Your Products” article and is written to explain to consumers why you should never have a 5-line electric fence.  The first bit of information to take note of is that one of the most common ways an alarm on a security electric fence is triggered, is when the earth and live wires touch.

Below we made a drawing showing the electric current on a 5-line fence.  You will note the top 2 and the bottom 2 lines are live wires and only the 3rd wire is an earth wire.  This means that only if the 2nd or 4th line connects with the 3rd line, an alarm will be triggered.  This is impractical as an intruder will not try to climb through the middle of your security electric fence, but under or over it.


Below we made a drawing showing the electric current on a 6-line fence.  You will note that if the top or bottom 2 lines touch each other (which is where an intruder is most likely to try and enter) the live and earth wires connects and an alarm is triggered.  In addition to the top and bottom 2 lines, if the 2nd and 3rd or 4th and 5th lines connect it will also trigger the alarm.

Do not let anybody try and convince you a 5-line fence is sufficient as a Security Electric Fence, just to save costs.  Above we have demonstrated why it is most definitely not the case.

We are happy to discuss any further topics – please let us know if you have any questions about this article or any other topic related to security solutions, either by commenting below or emailing us at  For information re the services we offer, please visit us at

5 April 2018, Nelspruit Fencing (Pty) Ltd, Nelspruit, Mpumalanga

Electric fence alarm system with pin-point ability

Electric fence alarm system installations have become common fixtures in South Africa. When an alarm is triggered on an electric fence alarm system the owner of the fence is alerted to an intruder and can take the necessary steps to protect himself, his family and his property.

But what if you are in the middle of a farm with an electric fence spanning more than 10 kilometres? How do you know where the breach has occurred? With the continuing improvement of fence and security technology the answer is quite simple.

JVA ZM20 - electric fence alarm system

JVA ZM20 – electric fence alarm system

By combining JVA’s ZM20 with a GSM Module, Nelspruit Fencing will split up your kilometres long fence into sectors and if an alarm is triggered in one of these sectors you will receive a text message (or email or Facebook notification, whichever you prefer) which will notify you of the sector in which an alarm is triggered.  This means you will be able to immediately direct your attention to the correct area, instead of traversing your entire fence before reaching the cause of the trigger.

In addition to directing you to the correct sector which is triggering an alarm, the ZM20 and GSM Module will also keep a careful log of any time when your energizer has been switched off and by assigning different codes to the different users, you will be able to see which user has switched off your energizer.


Clearly the electric fence alarm system will serve our farmers in and around Nelspruit (and anywhere else in Mpumalanga) well.  You will no longer waste precious time looking for the criminals on your farm to find out where in your crop they are stealing from, you will be able to zone in on them immediately.

If you have any questions about this specific electric fence alarm system or any other security solution, please contact James Deminey on +27 13 742 0004 / +27 74 104 6028 or visit our website