Rhinochugger
Retired Oik
It all depends on your dog like tendencies of digging up something that you've buried.Right, I've found some wire, it's the same as the stuff used for the track connectors. Can I just bury it or does it have to be covered?
If it's close to the railway line, and you don't think you're likely to go gardening there, just bury it.
If, on the other hand, other members of the family might take fancy to wielding a gardening fork, then it's worth protecting it in some way or other.
I've used 'ose (thank you to the two Ronnies) and I've used 20 mm conduit or 20 mm overflow pipe. Overflow pipe gives you right angle bends, conduit gives you easy bends with access lids - yer pays yer money and takes yer choice