Lightning Arrester Pole
A Lightning Arrester Pole is a metal pole mounted on a structure with the intension to protect the structure from a lightning strikes. In the case where lightning strikes the structure, it will strike the Lightning Arrester Pole and be conducted to ground, rather than passing through the structure where it could easily start house fires or cause electrocution to the occupants. Lightning conductors are also called finials, air terminals or strike termination devices.
In a lightning protection system, a Lightning Arrester Pole is one of the vital components of the system. The lightning conductor requires a connection to ground in order to perform its protective function. Lightning poles come in various different forms, which may include: hollow, solid, pointed, rounded, flat strips or even bristle brush-like. The main characteristics common to all lightning rods and poles is that they are all made of conductive materials, such as copper and aluminum. Copper and its alloys are the most common materials used in lightning protection.
A lightning protection system is designed to protect a structure from damage due to lightning strikes by intercepting such strikes and safely passing their extremely high currents to ground. A lightning protection system includes a network of air terminals, bonding conductors, and ground electrodes designed to provide a low impedance path to ground for potential strikes.
The energy in a lightning strike is typically in the range of 1 to 10 billion joules. This energy is released usually in a small number of separate strokes, each with duration of a few tens of microseconds (typically 30 to 50 microseconds), over a period of about one fifth of a second. The great majority of the energy is dissipated as heat, light and sound in the atmosphere.