It seems that table 300-5, Column 5 requires low-voltage landscape lighting cables to be buried 6". Article 110-3(b) requires equipment to be installed per manufcturers instructions.
Hadco(high-end fixtures, accessories,etc.)catalog states that the low voltage cable does not need to be buried,just covered with mulch, stones, etc. It recommends 4" burial when crossing lawns to avoid landscape tool damage. I once contacted Malibu, and was again told that the low voltage cable is not required to be buried. I say bury it 6" everywhere. What am I missing?