MacDaddy,
1700 ft is too long to run secondary, 120/240 volts. The utility company will install primary conductor to a stepdown transformer. This is not an installation for the property owner, however, the utility may require or allow the property owner to dig the trench. Normally, this will be 30" to 36" deep.

If its an option I would strongly recommend installation in conduit, PVC schedule 40 is normally used. Concrete encasement is overkill, except under pavement. A red caution tape will be installed about 12" above the conduit.

Primary electric cable doesn't just break. Problems are created by animals, trees, humans on backholes, and lightning.

Normal primary phase to ground voltages are 2400, 4800, 7200 & 7620 volts. The three phase voltage is 4160, 8320, 12470, & 13,200, respectivity. Some RECC's use a 14KV phase to ground voltage, but its not as common as the others. Also, most utilities are or have phased out the 2400/4160 voltage.

Hopes this helps and isn't too late. Dave

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