What is Rolling Sphere Method of Lightning Protection? Design & Calculations Explained | IEC 62305

Our team has Simplified the Explanation of Rolling Sphere Method for Lightning Protection, one of the most reliable lightning protection design methods. In this video, we'll simplify the complexities and walk you through its important aspects such as its radius, outer zones, and crucial calculations for air termination and penetration depth.

Firstly, we'll understand why such methods are required. The Rolling Sphere Method, Protection Angle method, and the Mesh method are three routes to design lightning protection systems as per IEC 62305, the international standard. These provide guidance for optimal placement of essential equipment such as lightning arresters, down conductors, and earth electrodes.

We will then delve into the Rolling Sphere Method for Lightning Protection, an efficient simplification of more complex designs. It plays a critical role in identifying unprotected areas of a building or structure, ensuring comprehensive coverage.

Next, we'll analyze the radius and outer zones of the Rolling Sphere, highlighting how the radius varies for different classes of Lightning Protection. We will also discuss how side strikes can occur on taller buildings and how we can mitigate these risks.

The video will then explore Lightning Protection Zones as defined by IEC 62305 Part 4, including LPZ 0A and LPZ 0B, providing insight into the direct and indirect lightning threats faced by internal systems.
Towards the end, we will explain the air termination calculations for the Rolling Sphere Method, focusing on the separation distance between air termination rods. Additionally, we'll tackle the crucial factor of penetration depth, which determines the maximum height of objects between air terminals, thus affecting the risk of lightning strikes.

#RollingSphereMethod #LightningProtection #ElectricalSafety

0:00 Introduction
1:05 What is Rolling Sphere Method?
1:46 Radius & Outer Zones of Protection
2:10 Lightning Side Strikes
2:53 Zones of Protection
4:03 Separation Distance Calculation of Air Termination Rods
4:27 Formula - Penetration Distance of a Rolling Sphere

[mpendulovuyodlamini]

This was very useful, thank you for the content.

[albertogenta]

I have found your video very good and I will keep it as a reference. However, I have noted the following: at 1:01 you show a down conductor bolted to the wall. What is the voltage at that point when lightning strikes? Is it safe for the wall or any other component behind the wall? It may arc to other conductive surfaces behind the wall. How about a human being touching with the hand there while lightning strikes?

[edmundsiew]

LPZ0B refers to the zone of indirect lightning strike, hence it is protected against the direct lightning strike

[annkitvj]

Hi...do you have any arrange to fix lightning arrestor on terrace where we can't do grouting/hole/drilling in slab.

[nandkumarhendre]

Supported well with all details
For lighting arrestor

[santhoshkumar-lkvn]

Pls explain about conventional type lightning protection system

[mohammadnurulislam]

Please explain LPS class -1 connection v class-2 connection.

[Vys_k]

Approx how much will cost for a normal house

[rachanaenercare]

Useful and well presented. I have mailed you to connect- Anil kumar Nadiger Rachana enercare -Mysore