Lead is not a good conductor of electricity. So, it is not used to make electrical wires.
If you can understand the concepts of Electricity, then I answer in a technical language as:
It has been experimentally proved that the resistivity of lead (Pb) is
1.9 * 10⁻⁷ Ωm
which is large for using as a conductor.
We have metals with much less resistivity, like Copper(1.68*10⁻⁸ Ωm) and Silver (1.59 * 10⁻⁸ Ωm), etc. So, we just don't use lead.