Home » English riddles » Switchgear » Switchgear Riddle No.2 – Busbar temperature rise » Reply To: Switchgear Riddle No.2 – Busbar temperature rise Reply To: Switchgear Riddle No.2 – Busbar temperature rise 2021-08-03 at 11:08 am #1627 Hamid Aluminum and copper conductors start oxidizing at about 90