On buildings having roofs of straw, reed, grass, or other very combustible substance, a suspended air termination that has a clearance of a minimum of 0·3 m on the roof may very well be suspended from non-conducting and non-combustible supports or, alternatively, the air termination conductor may very well be laid on a hardwood strip 75 mm vast.

In Tables 1A to 1E, the weighting component values are provided underneath headings ‘A’ to ‘E,’ denoting a

One more probability could well be to utilize the floodlighting towers, both as necessary features of the lightning protecting procedure or as supports for horizontal wires. In possibly case provision would want to get created to shield people from Hazard by direct connection with the towers or versus floor voltage worry around their bases.

Guide covered (two mm minimum amount thickness of coating) strip is most fitted for defense at the best of chimneys. Direct sheathing must be sealed at equally ends and also the sheathing shouldn't be eliminated when creating joints;

The table beneath which indicates the connection in between thunderstorm days every year and lightning flashes for each sq. kilometre every year:

Exactly where the circumstances within the previous paragraph can not be fulfilled, precautions ought to be website taken to make certain that the lightning present may be discharged to earth without having damage to the structure and its occupants as presented under:

The extent in the work plus the division of duty for Key fixings towards the framework, Specifically Those people affecting the watertightness of The material, mainly roofing.

Exactly where the above needs can't be content, the conductor really should be shielded as recommended in 10 and thought supplied to expanding its portion.

Buried ring conductors laid within the manner explained previously mentioned are regarded as being an integral A part of the earth termination community and should be taken into consideration when assessing the general value of resistance to earth of your installation.

Troubles arising within the provision of lightning protecting devices for these constructions are ideally handled by experts conversant with any relevant Statutory Rules and codes of exercise.

They need to be earthed at The purpose of entry exterior the structure and at two further factors, 1 about 75 m absent and a single a further 75 m absent.

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Advice is presented regarding how to evaluate the risk of getting struck and it offers a means of compiling an index determine being an support in deciding if a specific construction is wanting security.