IEC 60364 uses a three-digit classification to define the type of system earthing (grounding). You have likely seen these codes:
This details the initial and periodic testing of installations (insulation resistance, loop impedance, RCD testing, etc.). iec 60364.pdf
A glossary of over 200 terms used throughout the standard, including critical definitions like "Earth electrode," "Protective conductor," and "Fault current." IEC 60364 uses a three-digit classification to define
This defines the basis of all safety and operational requirements. It outlines the definitions for voltage bands (Band I and Band II) and the fundamental rules for protection. including critical definitions like "Earth electrode