The transition introduced several critical changes to how assemblies are designed, verified, and installed:
IEC 60439-1 covers the requirements for and Partially Type-Tested Assemblies (PTTA) . It applies to stationary or movable assemblies with a rated voltage not exceeding Key Installation and Compliance Aspects iec 604391 pdf install
The keyword "install" suggests another interpretation: that uses IEC 60439-1 as a compliance database. The transition introduced several critical changes to how
If you are designing new equipment, do not use IEC 60439-1 . Obtain IEC 61439-1 instead. If you are maintaining old equipment, keep a copy of 60439-1 but also study 61439-1 for upgrade paths. iec 604391 pdf install
: Before energizing, perform insulation resistance tests and verify the operation of mechanical interlocks and switching devices. Transition to IEC 61439 It is important to note that