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Category: Other

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. These wires are buried in a trench 30 to 36 inches deep when installed, measured from the top of the conduit or service wire to the top of the trench.
 
Due to erosion, service wires may not be as deep as when they were installed. Anyone preparing to do excavation work to dig around buried service wires would need to contact Texas’ underground service wires locator service by calling 8-1-1. It is necessary to contact them at least 48 hours in advance of digging to request service wires be located.
 
Using this vital service will help ensure safe excavation, plus it is the law that before anyone digs around buried power lines they must have the lines located.
 
-David R., Oncor Distribution Expert