Home » English riddles » Protection » Protection Riddle No.72 – Earth Fault » Reply To: Protection Riddle No.72 – Earth Fault Reply To: Protection Riddle No.72 – Earth Fault 2021-08-03 at 11:08 am #1964 Hamid Please refer to Protection Riddles No.47,52,56,60,65,66 We are ready for additional discussion if necessary.