Preventing Electrical Cable Theft

From Where? The warehouse, is it installed, is it live, outdoors, indoors, ground height, towers? Much more info is needed.
Dobermans are good with storage. Look for charred shoes if live wires are involved. Keep the ground moist for good conductivity.

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The devil is in the details, as mentioned above. Post your circumstances, there are different approaches depending on what you need.

My guess would be that the OP is living in South Africa.

Sorry for insufficient information

Actually, I means cut and stolen the Copper electrical cables (low voltage) from power distribution line, Cathodic Protection system, its.

A google search of "electrical cable theft" turned this up:

a cable theft monitor that is advertised will make three phone calls if triggered

Anybody have any futher information on this product?

I wanted to make you aware of a product that we have developed for cable monitoring. The RCDU (Remote Cable Monitoring Unit) is able to detect cable faults, including open circuits due to theft, over a length of powered or un-powered cable stretching several kms. If a fault is detected a message can be sent to our web-based monitoring centre as well as text/email messages to pre-defined points of contact. The fault reports contains the nature of the fault (i.e. possible theft, water ingress, cable insulation failure etc.) as well as a GPS co-ordinate. This is particularly useful in the case of theft as it happens immediately an open circuit occurs and maximising the chance of the thieves being caught. Feel free to contact me paul at varisys dot co dot uk

YES YES YES YES THERE IS A PRODUCT THAT CAN STOP CRIMINALS FROM STEALING CABLES. THIS PRODUCT IS CALLED CABLE SAFE. THE ULTIMATE CABLE PROTECTION.