working on the project today the lights power goes out RCD keeps tripping and trips the house RCD as its on a spur from the house after around 2 hours of hunting down the prolem I come across this …
The old incomming connection that goes to the garage RCD box with the Circuit Breaker’s has slugs in there they where a little fried 
now sorted and sealed back to working on the car … 
I don’t know if fried slug counts as a delicacy somewhere…
They came for my cabbage, destroyed my Russian kale and now they may be after my fuse box.
That corner looks like it may have been damp recently, which may be your cause.
Many years ago, my brother worked for a milking machine company. One day, they got a callout - milking parlour down, 400 cows crossing their legs, etc. He and his boss hop in the van and head out there to find that the PLC controller module that ran the parlour had blown. No big deal, controller replaced, all tested OK, so back to the office.
A few weeks later, they get another call from the same farm; they go out and find that the new controller has also blown. Odd. Controller replaced, tested everything they could think of, all OK.
A week later, and the phone goes again. Another visit to the troublesome farm to find that this controller has also blown. This time, it is still raining outside, and they notice that the rain is seeping through the wall enough to make the inside damp…
On a hunch, they smashed open the controller box to discover the root cause; when it rained with the wind in a certain direction, it would make the wall that the controller was mounted on damp. The local slug population would head up the wall towards the nice, warm controller and find a way inside - shorting themselves across 440VAC! Result: dead controller, and an equally dead slug that had ‘foamed up into something resembling a pool noodle’
They moved the controller and tidied things up, no further issues (and a very relieved farmer).
If you need a genuine waterproof junction box, try this Black Wiska I needed for my 10Amp drainage pump.
After I took this pic, I also gave it’s insides a spray of the classic WD40 (Water Dispersant 40); if it was good enough for several kV in my old Mini’s distributor, then a mere 240V would be nothing.
The original “waterproof junction box” installed by a sparky thirty years ago finally managed to corrode the Neutral wire to the pump open circuit; so the pump didn’t run and last year my garden ended up flooded after prolonged heavy rain. Those terminals in the pic below were supposedly “Brass”! Strangely, it did not trip the RCD.
Garlic dip, white wine, what’s not to like? Deelish. Relish the slither down the throat and the wriggle in the tum.
nope deffo the slugs caused this yes there is a damp patch but it was the slugs at fault … new box will arrive tomorrow nice story by the way… 
yep new box on the way arrives tomorrow…
Whoops, skipped a step there; Damp wall > highway for slugs > entry to junction box > kaboom!
Anyway, garage wiring can be a bit iffy. Mine was a hodgepodge of whatever the previous owner had lying around; 3 core + earth, old black/red, you name it - and it turned out that they’d cut all the earths off (?!). I spent some time during Covid rewiring the whole lot back to the breaker box, adding earthing, trunking and new sockets etc. So if I light myself up now it’s entirely my own fault 
yep see what you mean the connection box is around 4/5 inches from the door and the drain down pipe is the other side from the roof when the wind blows there’s a little kick back in the winter so that’s there route in spread that area with some salt solution so hoping that and the new socket will stop them trying to steel my electricity … 
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