ESE Protection Levels

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Protection level

According to NF C 17-102 Ed. 2.0, the standard protection radius (Rp) of the ORBITAL ESE is linked to ∆T, the protection levels I (98%), II (95%), III (90%) or IV (80%) and the height of the ORBITAL ESE above the structure to be protected (H, as a minimum 2 m)

The protection level of the object depends on several factors such as:

• if the object exists in an inhabited place or not
• if the targeted object is explosive or not,
• material of the roof and the roof construction (metal, plastic, concrete…)

The more precious and vulnerable object is the higher the level of protection needed. e.g. a school with a metal roof could be attributed to protection class 1. A telecommunication poles of low value could attributed to the protection class 4. The protection class can be calculated with ORBITAL lightning risk programme.


Height to install, higher the lightning terminal is installed the greater the protective radius Rp needed (m)


Protection radius, we suggest to install the lightning terminal within a height of 5 up to 6 meters so then you can then achieve a high level of protection.

Example 1 for COMET:

Home; Protection Level 1

The lightning terminal COMET has been installed at a height of 4m. The protection radius needs to be specified according to NFC 17-102/2011 edition standard with 63m, the efficient protection is higher, according to our test reports.

Example 2 for ZERU:

Factory Working Place; 150 m x 50m, Protection Level 1

There can be seen two lightning terminals S-A to install at a height of 6m.
The radius overlap and provide for the whole production facilities at sufficient protection level.
The protection radius should be specified according to NFC 17-102/2011 edition with 79m, the efficient protection is higher, according to our test certificates.

Protection Radius Table

Watch Protection Levels Simulations for Our Projects

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