Electrical conductivity refers to the ability of a material to transport electrical charge. Copper is the highest-grade material for transferring electrical charge in comparison to any other metal which makes copper a good conductor and a preferred option for electrical lighting.
When wiring a house, you need the electrical cords to be flexible enough to allow you to bend them easily, and around several objects. Copper is not brittle in its structure, and it is highly unlikely that it would break or crack upon bending.
Fire safety is a grave concern. Copper is the best material to use in electrical wiring, as it takes a lot to melt a copper wire. It is also likely that the copper wire will not burn or melt easily if it gets overloaded.