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As per NFPA 780 how would you calculate no of down conductor required for a building lightning protection?

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Question ajoutée par Muhammad Qasim , Senior Electrical Engineer , Energy Associates (SMC Ptv.) Ltd.
Date de publication: 2016/08/16
Utilisateur supprimé
par Utilisateur supprimé

Ref- NFPA 780 : the spacing between down conductors should be 30 mtr for roof perimeter exceeding 76 mtr, subject to minimum of two

asif mahmood
par asif mahmood , Electrical Design Engineer , Ministry of Defense

As per NFPA, there will be one down conductor after every 30 m distance. So for calculating the total no of down conductor, measure the total perimeter of the building and divide it by 30.

But for any building minimum two no of down conductors are required as per NFPA 780.

Luis Pujol
par Luis Pujol , ROB Coordinator , Tecnicas Reunidas

Check which kind of building in the following link:http://www.para-rayos.com/protec/docs/pdf/17_Sistemas_de_proteccion_en_jaula_Faraday.pdf

Basim Natour
par Basim Natour , General Manager , sulaiman alrajhi construction company

The number of down conductors depends on the perimeter of the external edges of the roof 

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