Lightning and Surge protection systems

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Introduction about Safety standard.

The most important aspect of understanding in lightning protection is that - not only a direct lightning strike

act as a potential threat to the structure but also more frequently, electronic equipment are damaged by surges caused

by remote lightning discharges (caused because of Lightning Electromagnetic Impulses LEMPs)or switching

operations in larger electrical systems. During thunderstorms too, high volume of energy is instantaneously released.

These voltage peaks can penetrate a building through Power, Data and Telephone cables causing heavy damage to

Electronic Equipment. The international standard for Lightning Protection referred as IEC 62305 – Protection against

Lightning’ , (which is also accepted by many countries as national standard) especially adopted by Bureau of Indian

standard as IS IEC 62305, in one of its part explains the need of planning, erection, testing and maintenance of

lightning protection systems for building structures without any height limit. The same is also implemented in new

National Building Code – 2016, Part -8, Section 2 which also clearly defines the need of the measures to be taken care

for planning, erection, testing and maintenance of lightning protection system. The standard IEC 62305 in its second

part – Risk Management categorizes the four sources of Lightning as 1. Flashes to a structure, 2. Flashes near to a

structure 3. Flashes to a service line, 4. Flashes near to a service line

Hedge Lightning Protection System

Team Hedge design a Lightning Protection system as per IEC standars to ensure increased protection of a building and Lives inside it against Lightning and its effects. Systems followed in most of the buildings now are unfortunately not meeting the basic or statutory requirements(Local Solutions-Hedge will not provide this). Since only a mere vertical air terminal will not solve the purpose for protection of building unless the entire building is sufficiently protected either with

1. Angle of protection method

2. Mesh conductor method or calculated as per rolling sphere method.

. A proper lightning protection system, should consist of three prime components in principal Air termination (vertical or horizontal mesh), down conductor and earthing system and should also offer a least resistance path for the discharge of lightning current. Separate measures as recommended in IEC 62305-4 Protection against Lighting: Electrical and Electronic system within the structure need to be followed and a proper and respective Surge Protection Device (SPDs)need to be employed individually for power line, data line and coaxial line for various application such as electronic appliances, internet modems, television etc. Assume a television has failed due to lightning, the protection measure for that Television shouldbe co-ordinated by employing SPDs at both power and Data inputs In both external lightning protection system and internal lightning protection system (SPDs) Earthing is an inevitable component, without which in both the cases dissipation of current is possible. Hence properly selected and properly maintained earthing is also needed for maximum safety in consolidation.