Hardmetal burrs - Spherical burrs (style D) Ingestion-build-156411 Earth monitoring system provides a

Earth monitoring system provides a means of maintaining a high degree of confidence in the measured impedance of a protective conductor forming part of the earthing arrangements of an electrical system

PD IEC/TR 62324 gives you detailed information about the arrangement of apparatus needed

which are described in IEC 61300-1

Specifications for common fields

Hardmetal burrs - Spherical burrs (style D) Ingestion-build-156411 Earth monitoring system provides a1 Scope This part of ISO 7755 specifies the main dimensions of the cutting part for hardmetal burrs of spherical shape and designated by the symbol D. Tolerances on the cutting diameter, direction of helix and cut, diameter and length of the cylindrical shank and designation of burrs are dealt with in ISO 7755 1.