Perlindungan Sistem kuasa (Power-system protection) - Bahagian 3a

Jenis-jenis 'faults' yang boleh berlaku pada sistem tiga fasa A.C. adalah seperti berikut:
(The types of faults that can occur on a three phase A.C. system are as follows:)

(A) Phase-to-earth fault
(B) Phase-to-phase fault
(C) Phase-to-phase-to-earth fault
(D) Three phase fault
(E) Three phase-to-earth fault
(F) Phase-to-pilot fault *
(G) Pilot-to-earth fault *
* In underground mining applications only