series. You can find official copies and previews through the IEC Webstore or authorized distributors.

Panels that used a mix of tested components and calculated designs. The Shift to IEC 61439

: Confirms the structure can survive mechanical stresses during a fault.

Before searching for the old PDF, confirm if your project requires the historical standard (60439-1) or the current standard (61439-1) .

Label every switchboard with its certification standard. If it says "TTA" or "PTTA" on the nameplate, it is almost certainly 60439-1.