Due to the absence of a zero crossing in DC, contamination can lead to sustained tracking. IEC 61936-2 references IEC 60815 and IEC 60664-1 for determining:
IEC 61936-2 requires a dedicated “bonding system” in addition to protective earthing, often specifying insulated return conductors or high-impedance earthing to limit current through the hull. iec 61936-2
Its application is divided into three critical pillars: Due to the absence of a zero crossing
IEC 61936-2 requires that all DC switchgear comply with relevant product standards (e.g., IEC 60947 series for low-voltage DC, or IEC 62271 series for high-voltage DC). Specific mandates include: Specific mandates include: For engineers, compliance is not
For engineers, compliance is not merely about checking a box. It is about ensuring that the metallic enclosures remain at safe potentials, that the earthing grid can swallow fault currents without lifting ground potential, and that the maintenance worker stepping onto a gravel pad is protected from lethal step voltages.
was developed to address the scenarios where those conventional rules do not apply. It specifically covers: