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According to CTE DB SU8 (Technical Building Code in Spain - Section B2):
“The metal structure of the building, metal installations, external conducting elements, electrical and telecommunications circuits in the space to be protected and the external protection system, if present, must be bonded to the earthing system via equipotential conductors or surge protectors.”
According to the Low Voltage regulations (RBT), the criteria set out in section ITC-23 of the Complementary Technical Instructions must be applied:
“These instructions refer to the protection of indoor electrical installations against transitory voltage overloads transmitted via power networks and caused mainly by electric discharges in the atmosphere, network switching and faults in networks.”
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