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The CU feeding the outside CU comes from the garage, and that is an MCB with an RCD main switch. The feeding CU never trips. I will upload photos of the replacement RCBO unit I got

Many thanks, this was helpful to me

Thanks Binky. I noticed that some RCBOs have the functional earth wire and some don't. Since the circuits are connected to the earth bar, what's the point of the FE wire?

Gotcha Just seen an RCBO CU on Screwfix. I could try that. Basically each RCBO has a neutral in and out and an earth in addition to the live in/out. Is the isolator switch anything, or just and on off switch?

Hi, the four circuits have MCBs and all of them are connected to an RCD main switch. So you're saying replace all the MCBs and main switch with RCBOs?

I have an outdoor CU with an RCD main switch and 4 x MCBs. Two of the MCBs control in-ground lights and the two remaining MCBs control an electric gate and a set of smart switches. After many years of solid operation the RCD has started to trip all the time. It looks like the light circuits...

hello everyone, just posting to see what you might suggest that we do. we got in touch with a well known national PV provider, specced up a 5kw system which includes a storage battery. the intention was to install the PV panels onto a new build annexe, we planned to build, as our house has a...