Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Earth return-en#Sense
Toma de tierra-es#Sense
Erdung-de#Sense
Jordledning-da#Sense
Γείωση-el#Sense
Mise à la terre-fr#Sense
Aarding-nl#Sense
Ground wire-en#Sense
Messa a terra-it#Sense