Here in OZ when cable is buried direct you have to install a thick protective strip. It's not a code requirement to install a marker tape for underground conduit but it's often done anyway. It's amazing how often you find it sitting on top of the conduit which makes the exercise pointless.
The problem is the wiring rules tell us that.......
Wiring systems installed underground shall be identified by an orange
marker tape complying with AS/NZS 2648.1.
The marker tape shall be
—
(a) positioned not more than 200 mm above the wiring system or any
additional mechanical protection provided;
[This message has been edited by Dapo (edited 03-11-2006).]
[This message has been edited by Dapo (edited 03-11-2006).]
