RCCB - Nuisance Tripping - Lighting Circuits (Wet Area Service)

Do an insulation test on cables outgoing from RCCB

"10 to 15 lights" or 10 to 15 strings of lights.

Have you measured amp draw of each circuit? Total load?

What have you done, so far?

From the information presented, there would appear to be a problem with the dimmer. Rectify it before re-energising.

Use an extermination service to get rid of the gophers.

Most of the LED fixtures have AC tyo DC conversion circuits with an electrolytic capacitor. All capacitors act as short circuit until it gets fully charged. Time cosntant depends on the circuit. Hence if all circuits are to be switched on simultaneously, the intial charging current will be high and may be the cause for your RCCB tripping. Reducing number of LED fixtures per RCCB will certainly help. You could also buy slower response RCCBs- which can withstand short time surges.

Your problem looks very much like due to turn on surge, as XYZ has pointed. It does not look like it has anything to do with earth leakage , so your solution 1 & 3 are out. Solution 2 may work as it reduces the turn on surge.

Thanks for your comments. I insisted our people to replace the RCCB by ECR with CBCT. I will update you the same once it done.

Please also update us on the gophers.

CBCT+ELR is RCCB. Solution-2 reduces the no. of lights in each circuit and thus the inrush current when switched-on.

100mA RCCB is important for human safety and any attempt to increase the leakage current rating or add a delay will make the system unsafe and you are risking electrocution.