Surge protective devices prevent excessive quantities of energy from entering the system. A lightning strike or utility power surge can cause equipment failure, resulting in hundreds of thousands of volts. However, external voltage anomalies generated by lightning or utility power only account for 20% of transient surges. These surges occur frequently and last longer, and they can damage sensitive equipment inside the facility, even if they are less powerful. A tight protection scheme is suggested in the Spanish Low Voltage Regulations (REBT ITC23).
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