On most New Jersey jobs, the excavator digs the trench and the licensed electrician does everything electrical: designing the circuit, choosing the wiring method, pulling the electrical permit, installing the conduit or cable, and making the connections. The one decision that ties the two trades together is trench depth, and the electrician makes that call through the wiring method. So the two should talk before the first shovel goes in.
Homeowners ask this constantly, usually when a garage, shed or EV charger is being planned and somebody has to get power to it. The short answer is a split of responsibilities. The longer answer is where the coordination problems come from.
The split
- The electrician designs the circuit, sets the wiring method, pulls the electrical permit, installs the conduit or cable, makes every connection, and arranges the inspection.
- The excavator files the 811 markout, digs the trench to the depth and route the electrician specifies, backfills, compacts and restores the ground.
Some electricians prefer to lay the conduit themselves, and others have the excavator place it under their direction. Agree on which before the crew arrives. We do not install conductors, make connections or pull electrical permits.
Why the electrician sets the depth
How deep the trench must go depends on how the wire is run. Direct burial cable, rigid conduit and nonmetallic conduit each have different minimum cover, and the circuit's voltage and protection change the answer too. We walk through the depth table, and who decides what, in trenching power to a garage, shed or EV charger. The electrician and the local electrical inspector set the exact requirement for your job.
The order of operations
- The electrician designs the circuit and picks the wiring method, which sets the depth and route.
- The electrician pulls the electrical permit from the town.
- The markout is requested, and the utilities are marked.
- The trench is dug to the specified depth, with hand digging within 24 inches of any mark. See the 24-inch rule.
- The conduit or cable is installed, and the inspector usually looks before it is covered.
- The trench is backfilled in layers, compacted and the ground is restored.
What to get in writing
- The route, the depth and the wiring method, from the electrician.
- Who places the conduit, and who is on the inspection call.
- Who schedules the inspection, and who coordinates the two crews.
- Who handles a surprise, such as an unmarked line or ledge.
If the trench hits something nobody expected, what happens when you hit an unmarked utility in NJ covers the first steps, and the electrician should be told at once.
This is general information, not legal advice. Your electrician and the local electrical inspector decide what applies to your installation.
