Depth for buried DC cables

[Beelbeebub]

Does anyone have a reference for the depth that DC cable needs to be buried - I assume the same as armoured AC (0.5m in general) but wanted to double check.

 

I was going to use the specific armoured stuff 

[JohnMo]

If you don't really need to bury l wouldn't - would surface run, then you can see them.