It is a metallic device mounted at the highest point of the building to capture lightning strikes and direct it to the earth via a safe path thereby preventing it from flowing through the building's electrcial circuit. In the absence of the lightning arrester a lightning strike could destroy electrical equipment and cause harm to human life through electrocutions.

It is a metallic device mounted at the highest point of the building to capture lightning strikes and direct it to the earth via a safe path thereby preventing it from flowing through the building's electrcial circuit. In the absence of the lightning arrester a lightning strike could destroy electrical equipment and cause harm to human life through electrocutions.