Every cable entry hole drilled into a gland plate must be sealed using an appropriately rated IP cable gland or sealing gasket.
Assemblies must be installed on a level, flat surface. Uneven floors introduce structural twisting, which can misalign door hinges, compromise locking mechanisms, and cause busbar stress.
IEC 60439-1 standard provides general rules for low-voltage switchgear and controlgear assemblies, focusing on type-tested (TTA) and partially type-tested assemblies (PTTA). It is critical to note that IEC 60439-1 was officially superseded by the IEC 61439 series
By following these guidelines, considerations, and best practices, you can ensure a safe and successful installation of low-voltage switchgear and controlgear assemblies according to IEC 60439-1. iec 604391 pdf install
Temperature rise limits and verification methods are significantly more stringent under the newer framework.
If specified by project design criteria for field verification:
Adequate clearance must be provided at the front, rear, and sides of the assembly to allow for safe operation, inspection, and maintenance. 3. Electrical Connections and Wiring Every cable entry hole drilled into a gland
Ensure all terminals are tightened to the specified torque setting.
series, many legacy systems and specific regional specifications still refer to 60439-1 for installation and maintenance protocols. What is IEC 60439-1? IEC 60439-1 specifies the requirements for Type-Tested Assemblies (TTA) Partially Type-Tested Assemblies (PTTA)
Test between phases (L1-L2, L2-L3, L3-L1) and between each phase and the earth bar. IEC 60439-1 standard provides general rules for low-voltage
Systems containing both type-tested and non-type-tested arrangements, provided the latter are derived from tested designs via calculation or simple structural replication.
Once installed:
A high-voltage test applied for 1 minute to confirm the integrity of the insulation materials, usually carried out by the manufacturer but sometimes required on-site after major re-assembly.
The assembly is loaded with its rated currents to ensure components, busbars, and terminals do not exceed maximum safe operating temperatures.