Eishkom has a very good fence. thet declared the perimeter a live yard, and the inner fence is on insulators and is connected to a 33kV transformer by a recloser with no cutout. Does a good job on copper thieves, as they are killed and cooked. Only way in is to have the SCADA open the transformer, then you can open the live gate in the middle fencing after unlocking it. This was done to prevent terrorists from blowing the yards up, but is still very effective for the economic terrorists.