By keeping the ground system for grounding and the neutral system to carry load current for 120V loads.
This is why the ground and neutral are to be kept totally separate after the initial bond at the service entrance .
Running neutral current on the ground system raises the ground system voltage above true earth potential .
It is difficult enough to keep the ground system at ground potential. Frozen soil, dry soil, dandy soil . Not unusual to be able to apply 120V direct to ground rods and not trip a 15 amp breaker . It does however drive the dew worms up out of the ground .
A service ground connected to a drilled well casing or to ground plates buried 10+ feet deep maybe required.
All barn loads should be 240V where possible . !20 V loads should be balanced so the neutral current back to the transformer is minimal.
As previously stated, PVC conduit or tech cable is the preferred method .
Anyone who things that the ground and the neutral is the same . Do tell us why a line, neutral AND and ground are routed together to wall receptacles etc.
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