Cut Wire and Earth Short test: how to check if your Electric Fence Security System is working properly

Testing your electric fence security system.

How do you know if your electric fence security system is working properly?  Those of you who are not installers by profession, may not know that to trigger an alarm the electrical current in your fence has to be broken.  This can happen in many ways, the 2 most common ways which will indicate an intruder is a cut wire or if the Live and Earth wires touch each other as someone tries to climb over your fence.

The ‘Cut Wire and Earth Short Test’.

Apart from merely trusting the installer doing work at your premises or studying up on electric fence security systems yourself to ensure you understand how it works, there is one easy way to check:  the Cut Wire and Earth Short Tests.  To ensure you have a proper electric fence security system, it is imperative that both these tests are done.

Installers should show you the alarm system works.

Upon completion of your electric fence security system, your installer must show you that if a wire is cut the alarm is triggered.  This can be achieved by removing a bridge or by cutting a wire and repairing it (Cut Wire Test).  In addition, the installer also must make a short between the Earth and Live wires by putting some object in connection with both (i.e. a screw driver).  This simulates somebody pressing the wires together as if they were trying to climb over the fence.  Once the short between the Earth and Live wires are made the alarm must be triggered (Earth Short Test).


Ensuring effective and relaible security services.

Nelspruit Fencing (Pty) Ltd will always ensure our customers have been shown that their electric fence alarm system works, by performing these tests and always ensures any questions the customers have is properly answered so that our customers understand all they need to know about their electric fence.

This is one of the tips to be sure you receive quality service.  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

23 March 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