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En las instalaciones de alumbrado exterior:a) Las luminarias de clase 1 se conectarán a tierra mediante un hilo de cobre de 6 mm? como mínimo,b) La resistencia máxima de tierra será tal que nunca se puedan dar tensiones de contacto superioresa 24 V, en las partes metálicas accesibles de la instalación.e) Cualquier elemento metálico no perteneciente a la instalación de alumbrado que esté a menos de3 m de las partes metálicas de la instalación, estará conectado a tierra.
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