SELECTION OF THE NIMBUS MODEL

NP: Protection level Rp: Protection radius h: Height of the top of the Nimbus on the surface to be protected * The top of the lightning rod has to be 2m above any other point of the structure.

PROTECTION LEVEL

According to the standards NF C 17-102 and UNE 21186 -96 three protection levels are considered:

Level I: Level with maximum security. Recommened for buildings and areas with persons in them, areas with high number of lightning per year, isolated unprotected areas, etc.

Level II: Level with high security: Recommended for the protection of persons and structures in areas with medium-low number of lightning per year, areas within an urban zone, etc.

Level III: Level with standard security. Recommended for the protection of structures in areas with low number of lightning per year, structures of reduced height, etc.

Remark: It is recommended for security reasons to consider level I.

SELECTION EXAMPLE

The selection table provides directly the Nimbus model and the height where the Nimbus needs to be installed in order to obain a certain protection radius (Rp).

An example in three steps is given below, where an area with radius of 50 m has to be protected with protection level I.

1- Select in the column protection level I of the table the desired or the next higher radius (58 m).

2- The vertical index indicates the model to be installed (Nimbus CPT-2).

3- The horizontal index indicates the minimum height of the Nimbus on the surface to be be protected (in this case the minimum is 5m).