Home / Low-voltage busbar spacing requirements
Adequate spacing prevents short circuits and enhances system safety: Bare copper busbars: Minimum clearance ≥20mm to avoid phase-to-phase or phase-to-ground faults. Insulated busbars: Insulation allows for reduced clearance but must meet IEC 60664or UL 746Cdielectric strength. The IEC 61439 standard applies to busbars, especially when they are part of low-voltage switchgear and control gear assemblies, e. IEC classifies environments based on pollution degree, which impacts insulation and clearance requirements: Higher pollution degrees require larger creepage distances. And for general industrial control equipment, voltage range 301-600, shortest distance is shown as 1/2" with this same value being shown through oil or air over surface. Between live parts of opposite polarity, 251-600V, Through air gap is 1", Over surface is 2". In IEC-based LV practice, engineers often use a practical approximation of Ipk ≈ 2.
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