All parts of the electricity supply system, including the lines and wires on your property, should be treated as live at all times. Stay safe around them. If you're working on your property, you should first identify the power line that brings power from the street into your house. It might be either overhead or underground. If the power line is within 4 meters of where you want to work, you must consider electrical safety.
Each network area has a different way of managing disconnections. Give us a call on 0800 4 FLICK (0800 435 425) and we'll either arrange a disconnection for you, or refer you to your local network company, depending on what area you're in. Fees may apply in some cases.