Ground Resistance Tester Model 6471
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APPENDIX A: GLOSSARY
GLOSSARY OF TERMS
Basic Terminologies
Explanations for some of the basic terms related to earth measurements follow:
Auxiliary electrode - H (Z)
A supplementary electrode through which a measurement current ows.
Earth conductor
The conductor which connects the installation to be earthed to the earth elec-
trode.
Earth connection
A locally restricted group of electrically connected earth contacts. It also in-
cludes metal parts of installations such as pylon footings, bracings, cable
sheathing and earth conductors.
Earth electrode - E (X)
A conductor which is buried in the earth and makes electrical contact with it.
Earth potential
The potential difference measured between the earth connection and a refer-
ence earth electrode.
Earth electrode - ES (Xv)
A connection on the earth electrode or earthing system used for measuring
the potential of the earth electrode.
Earth resistance
The resistance measured between the earth connection and a reference earth
electrode (cf. selective earth resistance).
Earth
The location of an earth connection (see also reference earth).
Earthing system
The set of all installations connected to the earth.
Electrode - S (Y)
An auxiliary electrode used for measuring the potential of the reference earth.
The voltage, which is proportional to the resistance of the earth connection, is
measured between this electrode and the earth electrode.
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