: For indoor installations, a minimum clearance of is required; for outdoors, it increases to .
If you are building a wind farm, a data center substation, or an industrial smelting plant, you cannot legally (or safely) sign off on the design without referencing IEC 61936. iec 61936 pdf hot
The buzz around a “hot” version stems from two major technical shifts in the 2021 consolidated edition compared to its 2010 predecessor: : For indoor installations, a minimum clearance of