Equipotentiality Connections AllEquipotentiality Connection 13 005 – Tinplated copper braid 13 009 – Tinplated copper shunt 16 143 – Copper potentiality equalising bar with 6 threaded holes Ø M10 on insulating contacts 16 144 – Copper potentiality bar with 10 threaded holes Ø M10 on insulating contacts 80 020 – Earth cut terminal 23 503 – Equipotentiality spark gap 350V 20 002 – Aerial post surge arrester 25 kA