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Ejercicio 10: Resistencia de las tomas de tierra Un edificio que dispone de pararrayos, tiene un perímetro de 315 m. Suponiendo que la naturaleza del terreno sea de arena silícea, calcular el número de picas de 2 m y la longitud del conductor enterrado para la puesta a tierra.
De acuerdo con la tabla de la guía técnica de ITC-BT-26 , dado que el valor 315 se encuentra entre 280 y 320, se optará por el valor superior de 320 m para garantizar la efectividad de la puesta a tierra. Esto implica instalar 20 picas y un adicional de 5 metros de conductor.
Optar por 280 metros implicaría un incremento considerable en el número de picas, requiriendo hasta 30 unidades.
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