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J3 on C1. I added the two new lights to this junction box. The photo of J3 above shows them currently unconnected, so essentially only the SWA is "connected" (SWA earth wire and SWA steel wire). Regardless of the two new light fittings being connected or not connected, the RCD still trips...

A photo of the main garden wiring box as installed by the electrician. Note, all the SWA earths are connected OUTSIDE the box using earth tags and he has then drilled through the box to fit the screws and earth cables inside. Not sure why he did it this way, rather than fitting the earth tags...

Here are a few photos. I would have taken more but it has started to rain heavily... Note: I've numbered the junction boxes on the original plan. J3 on C1 is where the two new light fittings were attached. The photo shows their positions and how they are currently NOT connected within the...

J1 Junction box on C1

J2 Junction box on C1

J3 Junction box on C1

2 New light fittings and junction box

There doesn't appear to be any pattern as to what causes the RCD to trip, except that the garden lights are on. Sometimes they trip as soon as they are turned on, sometimes they can be on for a while and then trip. Sometimes they are turned on and seem to be okay, then the garage light is...

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For clarity, circuit C3 doesn't currently have any light fittings connected and neither does the first junction box on C1. The end of C5 also has a junction box, but nothing is currently connected. If this tripping issue is ever fully resolved, these 4 junction boxes will be used to add...

"You’ve probably inadvertently connected lighting L-E or something similar" Definitely not. I've checked this. On some of the SWA the earth is Grey and on other the earth is the usual yellow/green, so I'm 100% sure I didn't connect the wrong wires. Besides, the 2 new light fittings I...

... I've just updated the diagram to include a circuit identifier, alongside the approximate length of the cable run e.g. C1, C2 etc. C1 is the circuit I added the 2 new light fittings to.

The part of the circuit I worked on was the one on the left, which shows 3 junction boxes and 3 20w lights. I simply connected the final two new 20w lights to the last junction box. No other work done anywhere else on the circuit. After it tripped, I removed those final two lights by...

Regarding the plan, there are two double pole switches; one for all the lights and the other for only the pump. One thought I had was to upgrade the 12 year old plastic consumer unit to use RCCB's instead of the existing MCB's and RCD's. I understand that any electrician performing this...

How time flies! Back in August 2019 I was having issues with the garden lights causing an RCD to trip as discussed in the following post: Strange RCD tripping issue I did eventually resolve this but it required an electrician to work through the fittings to try to identify the issue. He...

Thanks for the suggestion. I already have a small pair of these and didn't realise that's what they were called. I guess they would potentially be more useful than a 65mm fixed size spanner.

I have a strong suspicion these very large nuts are going to be hard to undue, so not sure a G-clamp would be upto the job.

Thanks for the link. I did see that one on eBay, but it is so cheap it made me wonder about the quality! I found this one, which is a possibility: Single Open End Wrench 65mm Metric U-Shaped Spanner with Red Shank Also available on Amazon although comments mention the varying width of the...

I have a Spirotech Low Loss Header installed as part of my heating system and all 4 connections have been slightly leaking for some time now. Spirotech provided me with some rubber seals to fit on the connections but I've been waiting for a time when I drained the CH system to install them. I...