Our latest technical q&a series focuses on inspection and testing. This month Robin's Mike Ferris looks at earth loop impedance measurement.
Measurement of external earth fault loop impedance (Ze)
Measurement of external earth fault loop impedance (Ze) is carried out with the main switch in the off position and earthing conductor temporarily disconnected (reconnect earth before restoring supply). Either a two-lead instrument or a three-lead device can be used.Source
Electrical and Mechanical Contractor
Postscript
Mike Ferris is marketing manager with Robin Electronics.
