Make sure they do not play at paper-kite around electric lines, do not take insulators as targets, do not enter in transformation substations, do not climb pylons and do not touch wires fallen on the ground.
 Install plug protectors: this is a warranty against the temptation to introduce anything  into the plugs.

 Never let  an extension-piece not connected to a device under tension and avoid wires that are lying on the ground.
 Turn off or disconnect devices that produce heat (iron, electric plates.) as soon as you go away.