IEC 61439 establishes comprehensive design rules for low voltage switchgear assemblies up to 1000V AC or 1500V DC, mandating verification of temperature rise limits, short-circuit withstand strength, dielectric properties, and protection against electric shock through testing . IEC 61439 establishes comprehensive design rules for low voltage switchgear assemblies up to 1000V AC or 1500V DC, mandating verification of temperature rise limits, short-circuit withstand strength, dielectric properties, and protection against electric shock through testing . rd IEC 61439. In particular, at international level, the Standards IEC 61439-1 Edition 2. This standard defines the design verification, test requirements, and thermal performance of the assemblies. The IEC 61439. The Standard IEC 61439 explicitly outlines the verification types required from both entities engaged in the final conformity of the solution: the Original Manufacturer, who ensures the design of the LV assembly system, and the Assembly Manufacturer, accountable for the switchboard's final. In standards terminology, low-voltage control panels, motor control centres, distribution boards and the like are known collectively as 'Power Switchgear and Controlgear assemblies', or 'PSC-assemblies' for short. By 'low-voltage' is meant voltages up to 1000 V a. PSC-assemblies. The IEC 61439 series of standards sets out the regulations for power distribution boards as well as assemblies for power distribution in public networks, construction sites, and for prefabricated busbar trunking and cabling systems.