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Think regs say 18 inch/450mm is considered a safe depth, the extra 150mm can’t hurt though.
If it’s got tape above it and some sort of signage, I’m sure it’d be fine. Have you got any works planned to actually dig near them at that depth?
Nef-
the lawn is shit (more rocks than mud) so plan is to resurface it sometime between now and next spring and I'll be putting in borders directly above in next couple of months.
i think having been hit in the face with so many hidden horrors that were just covered over and forgotten about (singular loft light running on old power shower circuit using existing wiring marked power shower on old fuseboard for e.g. ) I'm just keen to make the place as easy to maintain down the line for either us or the next owners.
HatBeard
I was using a mini mattock so i could only get down to 45cm as that was as low as i could swing it but i have a full size one coming today so i'm digging it down to 60cm when the weather stops being shit again so the trench will be open for a bit
I also have 5m of this coming to cover the cable in the trench before I fill it in.
https://www.superlecdirect.com/cable-accessories/hazard-warnings/4012-centriforce-stokbord-cable-protection-tile-cw-pegs/
but I just want something that will be immediately visible above ground to indicate where it is and not fade or get easily damaged.
probably easier to have them engraved on etsy or something I guess