By referencing the certified PDF tables of IEC 60038, asset owners, utilities, and manufacturers maintain a unified engineering language that keeps global electrical infrastructure stable, efficient, and safe.
IEC 60038 lists nominal voltages; applicable standards (or local regulations) specify permissible voltage tolerances and supply quality (e.g., ±10%, ±6%, steady-state & transient limits). iec 60038 standard voltages pdf 103