Air Terminals (Lightning Rods):

• These are conductive metal rods, typically made of copper or aluminum, mounted on the highest points of a structure.
• They serve as the primary point for the lightning to strike, directing the electrical energy into the system.
• Their primary function is to intercept the lightning strike before it can hit more sensitive parts of the structure.

Down Conductors:

• These are the cables or metal strips that run from the air terminals to the ground.
• They carry the electrical current safely to the ground, ensuring the energy is dissipated without causing damage to the structure.
• They should be designed to handle the high current produced by a lightning strike.

Grounding System (Ground Rods or Electrodes):

• The grounding system disperses the electrical energy safely into the Earth.
• Typically, this involves a network of metal rods or electrodes buried in the ground.
• The system should ensure low resistance to ground, allowing for a rapid and effective dissipation of the lightning current.

Bonding and Earthing:

• Proper bonding of the entire structure to the lightning protection system is essential.
• All metal parts of the building or facility (e.g., pipes, railings, structural steel) should be electrically connected to prevent sparking or side flashes during a lightning event.

Surge Protection Devices:

• These are installed on electrical systems, such as power lines, telecommunications, or data cables, to prevent surges from reaching sensitive equipment.
• Surge protectors help mitigate indirect lightning strikes or power surges caused by nearby lightning strikes.

Standards and Regulations:

• External lightning protection systems should comply with various national and international standards, such as:
• • NFPA 780 (National Fire Protection Association) in the U.S.
  • IEC 62305 (International Electrotechnical Commission) for lightning protection in general.
  • BS EN 62305 (British Standard) for lightning protection in buildings and structures.

Importance of an External LPS:

• Protects Human Life: A properly designed and installed lightning protection system can prevent injury or death caused by lightning strikes.
• Protects Property: It helps avoid severe damage to buildings and infrastructure, which could be caused by fire, electrical surges, or physical destruction from a lightning strike.
• Minimizes Downtime: For businesses and industries that rely on electrical systems, such a system helps ensure the continuity of operations by protecting critical equipment.