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gas lines are usually buried 450 and 600mm deep. Gas to a house is most likely around 18 inches for the house line around 30 to 36 gas main and water is around 3 to 4 feet towards the north where it gets cold. I guess you know the electric and phone could be buried too.
How deep is an underground electric line buried? Secondary service wires are the wires or distribution circuit on the low voltage side of a transformer. This is usually a 120/240-volt service for a residential or small commercial consumer. These wires are buried in a trench 24 inches deep when installed, measured from the top of the conduit or service wire to the top of the trench. Primary service wires are the wires or distribution circuit on the high voltage side of a transformer. This is usually a 7,200/14,000-volt service for a large commercial or industrial consumer.