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Early Streamer Emission (ESE) Lightning Protection System

The ASLA range of Early Streamer Emission (ESE) Lightning Arresters offers a safe and reliable system to protect your building or solar project from direct lightning strikes. The ESE Lightning Arresters, also known as Active Lightning Arresters, provide an enhanced Radius of Protection, reducing the number of Lightning Arresters and down conductors needed for your building or solar project while still providing complete protection. Contact us now or download our catalogue to learn more about how you can protect your project.

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ASLA NEWTransperant

         ASLA 30


Axis Smart Lightning Arrester (ASLA)

Why use Axis Smart Lightning Arrester?

  1. ASLA complies with International Standards (NFC 17–102 and IEC 62305), ensuring safety for your structure.
  2. Using a single Smart Lightning Arrester, your protection radius is extended in comparison to conventional systems.
  3. Installation is simple since one ASLA replaces multiple conventional lightning arresters.

How does an Early Streamer Emission (ESE) Lightning Arrester work?

The objective of the ASLA range of Lightning Arresters is to become the point of discharge for the lightning bolt, instead of the bolt hitting a random object such as a solar panel or the side of the building. By becoming the point of discharge, the electricity can be safely conducted into the ground using the entire lightning protection system, protecting the structure or solar park.

The ASLA system is based on the time difference (ΔT) between the emission time of a conventional lightning arrester and an early streamer emission lightning arrester, as demonstrated in high voltage testing laboratories. This emission from the ESE is generated by storing energy from the ambient electromagnetic field or static charges at the time of the lightning events. In normal conditions, the air terminal stays in standby mode. However, there is a spike in the ambient electrical field when a storm approaches the site. This spike causes the timely release of the stored energy, generating an upward leader from the tip of the ESE lightning arrester. This upward leader moves toward the downward leader from the storm clouds, creating a path for discharge. The bolt then passes safely through the conductive body of the ESE Lightning Arrester to the down conductors and finally safely into the ground, protecting the building or solar project. This working principle allows for an enhanced radius of production provided by Early Streamer Emission Lightning Arrester than by a conventional lightning rod.

As per NFC 17-102, the ΔT for an ESE Lightning Arrester should be at least 10μs - this means that the emission time of the ASLA ESE is at least 10μs faster than those from a Franklin Rod. Our range of ASLA ESE products ranges from a ΔT of 10μs to 60μs, depending on the requirements of the project.

ESE Air Terminal (ESEAT)

What is the Radius of Protection for an ESE Lightning Arrester?

The Radius of Protection of the ASLA is based on the calculations of NFC 17-102 and is dependent on the ΔT for the ESE model and the height of the structure. The Radius of Protection required for your structure will be based on the level of protection (class I, II, III or IV) defined during the risk assessment done as per NFC 17 102 or IEC 62305-2. The maximum permissible ΔT according to the standards is 60μs and thus the maximum Radius of Protection cannot exceed 120m for Class IV Protection.

Certified Lightning Protection

As a leading global name in Lightning Protection for the past 25 years, the Axis range of ESE Lightning Arresters are heavily tested using in-house facilities and third-party laboratories as per NFC 17-102 to ensure the highest levels of quality.

Technical Specification:

Axis Smart Lightning Arrester (ASLA) is composed of one main striking point, emission device, fixing element, and a connection to the down conductor.

The area protected by ASLA is determined using the early streamer emission test method as per NFC 17 102 Standard and it is preferred to have ASLA installed on the highest part of the structure.

The protected area is delineated by a surface of revolution defined by the protection radii corresponding to the different considered height h and which axis is the same as the one of the air terminal as per below figure, (source: NFC standard)

ESEAT protection


Protection Radius of Axis Smart Lightning Arrester:

The protection radius of an ASLA is related to its height (h) relative to the surface to be protected, to its efficiency, and to the selected protection level.

Protection Radius for ≥ 5m

Protection Radius for 2m ≤ h ≤ 5m


Rp = Protection radius of ASLA at a given height h (m)
h = Height of ASLA tip over the area of reference plane considered
r =

20m for ASLA-15 for protection Level-I

30m for ASLA-30 for protection Level-II

45m for ASLA-45 for protection Level-III

60m for ASLA-60 for protection Level-IV

Δ =

Initiation advance equivalent to efficiency of ASLA as per below(m)

ASLA-15: Δ=15

ASLA-30: Δ=30

ASLA-45: Δ=45

ASLA-60: Δ=60


Protection Radius

ASLA ESE Assembly

Earth Rods

Earth Rods provide low electrical resistance with the earth to allow for the dissipation of currents. The Earth Rod is also resistant to corrosion because it will be buried underground for a long period of time.

Worldwide, Copper Bonded Earth Rods which comply with IEC 62561 Part 2 are some of the most popular Earth Electrodes. Axis Copper Bonded Earth Rods are tested rigorously to meet the highest quality standards, are approved by Utilities across the world and continue to be popular due to their consistently high quality.

Axis Copper Bonded Earth Rods are available in a variety of sizes and are also available with the cUL marking.

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Testing of Axis Copper Bonded Earth Rods

Axis Copper Bonded Rods are rigorously tested as per international standards to ensure compliance. The video below describes some of the mechanical, electrical and chemical testing we perform to ensure the highest level of quality & production.

More Information on Earthing System and Lightning Protection Design

Earth Rods are just one part of the entire lightning protection system for a structure. We have published many articles discussing the details of the external lightning protection system and internal lightning protection systems. You can learn more about Earthing and Lightning Protection in the following articles:


Introduction to the basics of Lightning Protection and Earthing and the Standards (IEC 62305 and UL 467)


Lightning Protection System Design and Products


Surge Protection Devices (SPD)


Lightning Protection Zones and their Application to SPD Selection 


How does a Lightning Arrester work?


You can also watch our videos on YouTube to learn more about Earthing/Grounding and Lightning Protection.



For more information, please contact us at www.axis-india.com/contact-us/





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