G PHYSICS
G01 MEASURING; TESTING
G01R MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
G01R31/00 Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
G01R31/08 Locating faults in cables, transmission lines, or networks
G01R31/081 according to type of conductors
G01R31/085 in power transmission or distribution lines, e.g. overhead