Betapack 3 - Intermittent tripping of mains RCBO

[Ian_p]

I have 7 betapack 3s, 5 in a rack and 2 either side of the stage.

On the 5th pack in the rack, I am getting occasional but persistent tripping of the mains RBCO. 

This is an old install, but recently the 4th and 5th packs have had their own 32amp supply fitted as they were previously fed from 13amp plugs on the stage ring-main.

The 4th pack does not trip, the individual channel MCBs in the 5th pack do not trip, and swapping the feeds between the packs, the issue remains on the 5th pack.

The show starts next week - any suggestions what is at fault? Thanks in advance.

[scottydog75]

Simple question first, you're not trying to draw more than 32A from the Betapack?

If not, there is likely something inside the Betapack, or from one of the lanterns connected to the Betapack, which is leaking current to earth, causing the RCBO to trip.

If you move all of the lanterns on Betapack #5 to Betapack #4, does the fault move across with them? That should hopefully rule out a lantern or dimmer issue.

Intermittent faults are always the worst to try and diagnose, good luck!