What type of connections does Section 690 address specifically?

Section 690 of the National Electrical Code (NEC) specifically addresses the electrical connections related to photovoltaic (PV) systems, which includes the interconnection of PV modules, inverters, and other related electrical equipment. This section outlines the requirements for proper installation and safety measures to ensure that electrical connections are made in compliance with safety standards set forth by the NEC.

By focusing on the electrical connections, Section 690 emphasizes the importance of ensuring that all wiring, terminations, and connections are made to prevent hazards such as electrical shock, short circuits, and fire risks. It includes guidelines regarding conductor sizing, grounding, and bonding of components within the PV system, making it crucial for safe installation and operation.

Other options, while related to solar installations, do not fall under the specific purview of Section 690. For instance, mechanical connections for support structures pertain to structural integrity rather than electrical safety concerns, data connections involve communication protocols which are dealt with under different NEC sections, and connections for batteries in hybrid systems would also have dedicated sections focusing on energy storage systems and their respective safety measures.