<![CDATA[Abstract A lightning protection system is an essential component in ensuring building safety, protecting occupants, and safeguarding electrical installations and electronic equipment. The New Building of the Faculty of Islamic Studies at Universitas Alwashliyah Medan is an educational facility with intensive daily activities and numerous electronic devices that are vulnerable to lightning strikes. This study aims to design an external lightning protection system and a grounding system in accordance with the General Regulations for Lightning Protection Installation (PUIPP), IEC 62305, and SNI 03-7015-2004 standards. The research employed a quantitative engineering design approach through field surveys, building dimension measurements, lightning risk assessment, protection system calculations, air terminal protection angle analysis, and grounding system design using the multi-rod method. The results indicate that, based on the PUIPP assessment, the building has a high lightning hazard level with a risk value of R = 14, indicating that a lightning protection system is highly required. According to the IEC analysis, the lightning ground flash density (Ng) is 34.6 strikes/km²/year, while the annual direct lightning strike frequency (Nd) is 0.259 strikes/year, resulting in a protection efficiency of 61%, which classifies the building as Protection Level IV. The proposed protection system consists of four copper air terminals, 16 mm² copper down conductors, and a grounding system employing four parallel rod electrodes. The grounding resistance was reduced from 37 Ω to 9.25 Ω using the multi-rod configuration.]]>
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