Installation

Installed to the highest standards and comply with the current standards and specification.

Installation - Lightning Protection

UK-wide Lightning Protection Services

Whether it be a Domestic, Commercial or Historic building our systems are designed and installed to the highest standards and comply with the current standards and specification set out in BS EN 62305 - 2006. A lightning protection installation can range from a Class I, II, III & IV and in brief consists of an Air-terminal Network, Down Conductors and Earth Terminations.

Air-terminal Network

The air-terminal network is a grid section installed at roof level forming a faraday cage with cross bonding to all extraneous metalwork, roof mounted plant and potential strike points. Where practical metallic roof coverings can be utilised as a natural conductor therefore eliminating the need for a roof mounted air terminal network.

The table below shows the Class of lightning protection system and how the air-terminal network grid section is to be installed in meters.

Class	Grid Section
I	5m x 5m
II	10m x 10m
III	15m x 15m
IV	20m x 20m

Down Conductors

Down conductors are interconnected to the air-terminal network and give the current a safe path to the earth terminations in the event of a lightning strike. Where practical structural steel and reinforcing bars can be utilised as a natural conductor therefore eliminating the need for a externally fitted tapes.

The table below shows the Class of lightning protection system and the maximum distance between down conductors.

Class	Maximum Distance
I	10m
II	10m
III	15m
IV	20m

Earth Termination

The earth terminations are connected to the down conductors and are a vital part of the lightning protection system as they disperse the current into the ground safely in the event of a lightning strike.

The standard that relates to such protection states an earth location when tested should not exceed 10 times the number of earths of the system and a connected system should not exceed the maximum 10 Ohms.

Example

If a lightning protection system has 3no earth terminations then when disconnected and electrically tested the maximum resistance to earth of each earth should not exceed 30 ohms.

Conductor Tape

The most commonly used conductor tape is 25mm x 3mm PVC covered aluminium or copper and is supplied in a number of colours to suit the aesthetics of the structure.

Black	18B29*
Green	BS 6746C
Grey	00A07*
Stone	08B23*
White	10B15*
Brown	06C39*

*PVC colours to BS 5252

All our materials are supplied by leading suppliers Furse Thomas & Betts and A. N. Wallis, for further information on their products use the links below.

www.furse.com
www.an-wallis.co.uk

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