ELCB required for street lighting panel?

[Jed057]

Dear Guru.;
Anyone please advise me.
There is one street lighting panel main CB 100 A.

The problem this main CB always trip via ELCB 30 mA.




My concern is we required ELCB (earth leakage CB) for this main CB or not,every Street lighting pole already had connected with earting cable 16 sq.mm.
IF Not necessary,we will remove it.
Thks[highlight ][highlight #8F5902][/highlight][/highlight]

 

[ScottyUK]

What country's rules are you working to? Some of it sounds European / IEC from the cable sizes, although RCD is the modern name for ELCB. In the UK a fixed installation lighting column wouldn't normally need a 30mA RCD.