IEC · International Electrotechnical Commission
The international electrotechnical standards body; its installation and equipment series govern designs outside North America, where the NEC and ANSI stack does not apply.
Current numbers
60 V DCIEC 62368-1 ES1 limit: 60 V DC steady state, above the 48/50 V rack bus; arc and stored-energy hazards remain
0.2S / 0.5S (IEC examples); 0.2 / 0.5 (ANSI examples)AC revenue-meter accuracy-class examples at the POI: IEC 62053-22:2020 (0.2S/0.5S), ANSI C12.1-2026 (0.2/0.5)
Parts 2/3/6/8/9ISO/IEC 30134 KPIs: PUE, REF, ERF, CUE, WUE (Part 4 ITEEsv for server efficiency)