IEC

By long-standing agreement the IEC holds the electrotechnical half of international standardisation: rotating machines, switchgear, cables, installations, instrumentation. For process and energy facilities two of its families carry particular weight — the standards for equipment in explosive atmospheres, underlying the Ex certification regimes, and the functional-safety standards behind safety-instrumented systems, which together shape how hazardous plants are electrified and protected.

The global electrical world, however, is genuinely bipolar: IEC-based practice across most of the planet, and North American practice built on its own code and certification system, differing in voltages, protection philosophy, equipment ratings and hazardous-area classification method. The two are internally coherent and mutually untranslatable at the component level, so an international project declares its electrical basis early — and projects that inherit equipment, engineers or specifications from the other world pay a conversion cost that is never zero.

The mundane failure is the mixed basis: IEC design with components certified to the other regime, or area classifications performed by one method and equipment selected by the other's categories. Electrical reviewers find these; commissioning finds the ones reviewers miss.