Replacing existing outside light cable

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There is 1.5mm t&e cable running to some outside lights on the wall. Doesn’t look that old but is white. There are three LED fittings totalling 40watts



They are out of reach and test ok, with a mega. However I want to replace them , preferably put them in conduit. Or run a new black round cable, but which type ?
They currently run to the fuse box into a lighting circuit. Should I fit an RCD before the cable runs outside ? My main thought is to run a 1mm rubber sheathed sold core cable along the wall and terminate wit a 3 amp RCD plug into a socket in the garage. Taking out the fuse box connection



essentially I am replacing an existing install but read conflicting pointers as to the correct materials. I am an, old, electrician so happy with doing the work
 
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NYY-J might work better, its solid core so should sit a bit nicer, whereas flex might droop a bit between clips. But otoh its probably bulkier and doesnt come in smaller sizes. Personally i wouldnt use conduit. At my brothers recently we used some outdoor rated black flex, 3138P i think, which worked well enough in a grout line with plenty of clips for exactly the same setup as you.

If your lighting circuit already has an RCD protecting it, then you dont need another one. If it doesnt, then you ideally should be rectifying that issue, rather than adding one just for the outdoor lights. What i would do though is ensure there is a double pole switch so you can isolate them.
 
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That’s one I was looking at (y) Thanks

RCDs in all the CU circuits. Outdoor lights are wired into the downstairs lighting circuit. My only thought was to separate them from the CU

Good tip about the double pole isolator as it’s always annoyed me that there wasn’t one. Agree with the conduit.

many thanks
 
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I would just keep it on the lighting circuit if its there already. The DP isolator means if for any reason water gets into them and causes nuisance tripping, you can isolate off the whole outdoor branch and keep your indoor lights working.
 
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I've used the Linian fire clips, they compress into a single 10mm hole, CEF sell them.

Blup
 
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I’ll check those out as I’m not familiar with them
Thank you, I’m always pleased to learn
 
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