This is arguably the most referenced section. The standard provides tables to determine the minimum air clearance between live parts and earthed parts based on:
| Standard | Scope | Key Difference | | :--- | :--- | :--- | | IEC 61936-1 | AC > 1 kV | General rules for all installation types (substations, lines). | | IEC 61936-2 | DC > 1.5 kV | The direct current (HVDC) counterpart. | | IEEE Std 80 | AC Substation Grounding | US-focused; only covers earthing, not the entire installation. | | EN 50110-1 | Operation of installations | Covers operational safety (work permits, live working), not design. | iec 61936-1 pdf
The IEC (International Electrotechnical Commission) owns the copyright. Official PDFs are available for purchase from the IEC Webstore or national bodies (e.g., ANSI in the US, BSI in the UK, DIN in Germany). This is arguably the most referenced section
No. The standard contains numerous tables (e.g., minimum clearances based on altitude, lightning impulse withstand voltage, pollution levels) and normative references. A two-page summary cannot replace the 150+ pages of detailed requirements. | | IEEE Std 80 | AC Substation
IEC 61936-1 does not stand alone; it references and complements numerous IEC standards: