: Capability to accommodate external incoming and outgoing cables. Performance Requirements
Resistance to corrosion, UV radiation, mechanical impact (IK rating), and thermal stability (glow wire testing).
The series is the definitive international standard for low-voltage switchgear and controlgear assemblies. Since July 2020, Edition 3 has replaced previous versions, introducing stricter design and routine verification requirements to ensure global safety and performance. Core Parts of the Standard
The is the internationally recognized benchmark for the design, verification, and performance of Low-Voltage Switchgear and Controlgear Assemblies (ASSEMBLIES)—commonly known as switchboards, distribution boards, and motor control centers (MCCs). These standards replaced the earlier IEC 60439 series in 2009, introducing a fundamental shift from type-tested to design-verified assemblies. iec 614391 and 2 pdf
The IEC 61439 series has significant implications for the electrical industry:
If the Assembly Manufacturer introduces modifications not included in the Original Manufacturer’s verified design, they assume the role of the Original Manufacturer and must re-verify those changes themselves. 3. The Core Verification Process
. For decades, it had tried to keep low-voltage switchboards safe, but it was often confusing. It used riddles like "Type Tested" (TTA) and "Partially Type Tested" (PTTA), which left many panel builders scratching their heads. : Capability to accommodate external incoming and outgoing
While Design Verification is done once by the Original Manufacturer, must be performed by the Assembly Manufacturer on every single completed panel before it leaves the workshop.
The Complete Guide to IEC 61439-1 and -2: Standards for Low-Voltage Switchgear and Controlgear Assemblies
The old TTA (Type Tested Assembly) and PTTA (Partially Type Tested Assembly) categories from IEC 60439 are completely obsolete. Under IEC 61439, all assemblies must undergo to prove compliance with 13 distinct criteria. Since July 2020, Edition 3 has replaced previous
The original manufacturer tests the modular system architecture to prove it meets the specified requirements of IEC 61439-1 & -2.
Power-frequency withstand voltage tests and impulse withstand voltage tests.