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External Protection According with NFC 17-102: 2011, UNE 21186: 2011 and NP4426: 2013 standards, in its point 5.2.2 and C.2.2 indicates that a lightning rod to be considered an ESE lightning rod, must obtain a ΔT at least of 10 microseconds, and the maximum permissible value of (ΔT) is 60μs, although in the test have obtained superior results.