Humans hit by lightning may also have their eardrums blown out by the incoming pressure wave, their respiratory system paralyzed, or suffer secondary burns as their hair or clothing catches fire. But lightning doesn’t kill all of its victims; around 90% of people struck survive

A lightning arrestor and a lightning rod are both devices designed to protect structures and electrical systems from the harmful effects of lightning strikes, but they serve different purposes and are used in different contexts. Here are the key differences between the two:

Lightning Rod

• Function: A lightning rod is a metal rod or conductor mounted on top of a structure, such as a building or tower, and connected to the ground through a wire. Its primary function is to provide a low-resistance path for lightning to follow, safely directing the electrical discharge to the ground.
• Placement: Lightning rods are installed at the highest points of buildings and structures.
• Application: They are used to protect buildings and other structures from direct lightning strikes by preventing fire and structural damage.

Lightning Arrestor (Surge Arrester)

• Function: A lightning arrestor is a device installed in electrical power systems and telecommunications systems to protect insulation and conductors of the system from the damaging effects of lightning and switching surges. It works by diverting the surge to the ground, thereby protecting the system from over-voltage conditions.
• Placement: Lightning arrestors are typically installed at various points along power lines, substations, transformers, and other electrical equipment.
• Application: They are used to protect electrical and electronic equipment from voltage spikes caused by lightning strikes or switching surges.

Summary of Differences

• Purpose:
  • Lightning rods protect structures by providing a direct path for lightning to reach the ground.
  • Lightning arrestors protect electrical and electronic equipment from voltage surges.
• Installation Location:
  • Lightning rods are installed on buildings and other tall structures.
  • Lightning arrestors are installed on electrical power systems and equipment.
• Protection Scope:
  • Lightning rods protect against direct lightning strikes.
  • Lightning arrestors protect against indirect lightning strikes and over-voltage conditions in electrical systems.

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In summary, while both devices are essential for lightning protection, lightning rods are used to safeguard buildings and structures from direct strikes, and lightning arrestors are used to protect electrical systems from the transient effects of lightning and other surges.

Lightning rods and lightning arrestors both play a role in protecting from lightning strikes, but they do so in different ways:

Lightning Rod:

• Function: Provides a preferred path for a direct lightning strike.
• Location: Installed on tall structures like buildings or towers.
• Mechanism: Acts like a pointed conductor, attracting lightning and channeling the current safely down a cable to the ground.
• Protection: Protects the structure itself from direct strikes and the associated damage from fire or electrical surges.

Lightning Arrester:

• Function: Diverts indirect voltage spikes caused by nearby lightning strikes.
• Location: Installed on electrical or communication lines entering buildings or equipment.
• Mechanism: Acts like a valve that remains open in normal conditions. During a voltage surge, it conducts the current to the ground and then resets.
• Protection: Protects electrical and electronic equipment from damage caused by voltage surges induced by nearby lightning strikes.

Here’s an analogy:

• Lightning Rod: Like having a lightning conductor on your house, attracting the strike and diverting it away.
• Lightning Arrester: Like having a surge protector for your electronics, safeguarding them from the after-effects of a nearby strike.

In conclusion, lightning rods offer a direct path for lightning, while lightning arrestors deal with the indirect effects of voltage surges. Both are important for a comprehensive lightning protection system.

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