Underground cables are cables for power networks that have thick insulation and are laid in the ground. Underground cables are available for all power grid hierarchies. For high voltage networks, medium voltage networks and for low voltage networks.
Underground cables are laid in trenches and can be designed for AC or DC voltage. They have more or less thick insulation, the thickness of which depends on the voltage to be transmitted. The cable sheath has rodent protection and is resistant to weather, lightning, moisture and mechanical stress.
Extensive shielding largely eliminates electrosmog when transmitting alternating current. Direct-current transmissions are much more efficient than alternating-current transmissions because they make full use of the cable diameter and have no losses due to reactive power.
Unlike overhead lines, buried cables are not visible and do not disturb the landscape.