Standard describes the main measures for the protecting buildings against direct lightning
strokes using an early steamer emission lightning conductor. The Principal of protecting
buildings against lightning is based on the electro-geometrical model.
This Standard provides information for the state-of-the art design of a satisfactory lightning
protection system for structures (building, fixed facilities…) and open areas (storage areas,
leisure or sports areas..) using an early steamer emission lightning conductor and provides
instructions as to the methods to be such used for achieving protection.
As in the case with anything related to the natural elements, a lightning protection system,
design and installed in accordance with this standard will significantly reduce the risk of
protected structures being damaged by lightning.
The Design to provide a structure with a lightning protection system depends on the following
factors: Lightning stroke probability, severity and the acceptable consequences. The selection is
based on the parameters contained in the risk assessment guide given by the NFC 17-102
standard. The risk assessment guide also indicates the appropriate protection level.
In Early Steamer Emission Lightning Protection- a Lightning rod equipped with a system which
creates the triggering advance of the upward leader when compared with a simple rod (S.R.)
Lightning conductor in the same conditions.
Simply, a Rod which does not having specific triggering advance device is not an Early Steamer
Emission Lightning Arrestor.
The zones of protection of lightning conductors are obtained theoretically by plotting the electro
geometric model, but are comparable in practice, for low heights, to a cone of revolution which
apex is the tip of the lightning conductor.
The Table here under gives the Rp (m) values for the three levels of protection Np depending on
the actual height h (m) of the lightning conductor in relation to the different planes considered.