All PV equipment must be grounded per NEC 250. Modern solar installations use several key safety components. Bonding connects metal equipment parts together to establish electrical continuity and prevent electric shock. This article covers grounding in PV systems, which differs slightly from standard grounding systems. Why Combiner Box Grounding Matters More Than You Think In solar installations, the photovoltaic. PV combiner box wiring diagrams provide essential visual documentation of string connections, grounding architecture, and bonding conductor routing required for safe and code-compliant photovoltaic installations. Understanding proper wiring topology, conductor sizing methodology, and grounding. Properly grounding solar PV systems is one of the most critical aspects of a safe and reliable installation, governed by Part V of NEC Article 690. This process involves two distinct but related concepts: system grounding, which provides a reference to earth for the electrical system (stabilizing. About 15' from the pole there is a small shed which contains the PV array combiner box which has two 125V / 20A DC disconnects and sends one DC circuit to the cabin. Also in the shed is a propane powered 8kw generator.