Top Clamp for 25 KV OHE Discharge Rod as per RDSO specification No ETI/ OHE/ 51 ( 9/ 87 ) REV. 1 ( Mar- 2019 ) or latest made of copper or aluminium bronze suitable for round/ stranded conductor of 10 MM to 20 MM dia ( 65 % of total quantity ) and suitable for circular busbar of 36 MM ( 35 % of total quantity ).