Home » English riddles » Protection » Protection Riddle No.12 – Inability of Earth fault protection system » Reply To: Protection Riddle No.12 – Inability of Earth fault protection system Reply To: Protection Riddle No.12 – Inability of Earth fault protection system 2021-08-03 at 11:08 am #1291 V.K. Nambiathiri In the case of auto- transformer such arrangement will not work