A lighting conductor is a metal rod attached to a building and connected to a thick copper strip that leads into the ground. Ligtning conductor can help protect building’s and other structure from lightning strike. When lightning strikethe conductor , electric charges flow along the wire and are dissipated to the ground thereby protecting the building.
A negatively charge cloud passing overhead causes the sharp spikes of the conductor to become positively changed.
The intense field around the spikes causes air to be ionized, electrons on the cloud are then attracted to the spikes and are safely conducted to the ground while the positive ions are repelled to the cloud. Since the negative charges is earthed the lightning does not harm to the buildings.