NEC Article 706 covers energy storage systems (ESS), especially those over 60 V DC, and outlines their particular grounding needs. Additionally, NEC Article 250 defines grounding and bonding criteria, emphasizing the differences between grounded, ungrounded, and separately. . Battery racks should be grounded to prevent electrical hazards, reduce fire risks, and ensure compliance with safety standards like NEC Article 480 and NFPA 70. Grounding stabilizes voltage levels, mitigates stray currents, and protects against short circuits. The goal of grounding and bonding is to achieve customer-targeted resistance levels. In most stationary systems, the negative side of the battery stays ungrounded.
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