Photovoltaic distribution boxes must comply with international and national standards for safety, construction, and electrical performance, including IEC 62790, IEC 61439, and CEI regulations.
IEC 62790 specifies safety, construction, and testing requirements for junction boxes on PV modules up to 1,500 V DC, ensuring protection against electric shock, environmental conditions, and operational faults in accordance with class II of IEC 61140:2016 . IEC 61439 governs low-voltage busbar assemblies, including those used in PV power systems, defining design verification, thermal performance, and test requirements for safe and reliable operation . These standards ensure that PV distribution boxes can handle rated currents, overvoltages, and short circuits while maintaining system integrity.
In Italy, PV systems are regulated under CEI 0-16 (medium to high voltage grid connections) and CEI 0-21 (low voltage grid connections), which define technical, safety, and efficiency requirements . For low-voltage electrical systems, CEI 64-8 outlines mandatory provisions for PV switchboards, including string boxes and protection devices. Italian Legislative Decrees 42/2004, 17/2022, and 190/2024 provide guidance on installation permissions, particularly in areas with landscape or cultural constraints, and streamline procedures for unrestricted building works .
PV distribution boxes, including string boxes, must include:
These boxes are positioned between PV modules and inverters, standardizing voltage, current rating, and the number of strings. They also facilitate maintenance and system diagnostics.
By adhering to these standards and regulations, PV distribution boxes can provide reliable protection, safe operation, and compliance with both international and national requirements.
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