Bury the outdoor ROMEX® in a trench in the ground when running electricity from one location to another. Check with your city or municipality for the required burial depth. These depths vary between 18 and 24 inches.
Lay the outdoor ROMEX® directly in the trench without conduit and cover it with the dirt you removed from your trench. The insulation material of the cable protects the encased electrical wires from moisture.
Encase the outdoor ROMEX® in conduit where it is not underground. Running the cable from the ground and up a wall requires the protection of either metal or PVC conduit. Even though the cable is both moisture and sunlight resistant, the cable is susceptible to damage from animals or objects hitting the cable.