Really felt sorry for a customer who called me to check his faulty garden lights.
He had a dozen mains voltage walkover lights, similar to the photo, set into his beautiful paths. Each time he switched them on, the house electrics tripped out. It didn’t take long to discover that water had leaked into 7 of them, shorting the electrics. Okay, a simple job of resealing? Nope! Not this time!
Alarm bells rang when I spotted the new circuit had been installed without issuing a “Part P” certificate – a complete “no-no”, followed by incorrect cable clips from the cable going to the path. The wall switch was incorrectly wired too! What next?
Water had leaked into the lights from below, rusting the internals and because the lights hadn’t been installed correctly (just connected then concreted below the paving), it was impossible to remove them to rectify the cable seal. Also, the “electrician” who installed them, had hidden junction boxes somewhere under the lawn. More moisture in there too? Very possibly. All my tests suggested multiple earth faults, so it was pretty bad.
The owner decided that rather than lift large sections of his paving, and rewire/replace the entire garden lighting properly, he would simply forget about the lights and leave them disconnected.
Always get a “Part P” qualified Electrician like Currelec to do any outdoor work. If you’re having your garden landscaped, check the company doing the work is using a “Part P” Electrician too and get this in writing.

Garden Lights from