Home » English riddles » Switchgear » Switchgear Riddle No.6 – Four poles ELCB instead two poles » Reply To: Switchgear Riddle No.6 – Four poles ELCB instead two poles Reply To: Switchgear Riddle No.6 – Four poles ELCB instead two poles 2021-08-03 at 11:08 am #2535 V.K.Nambiathiri May please explain why first two connections are wrong