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There are four common options for running underground electrical wiring through your yard. Your choice primarily depends on the type of soil you have. If it’s granular and easy to dig, you can save money on electrical materials by digging deep; you may not need to install metal or plastic conduit to protect the buried wiring from physical damage.
Discover the 8 rules for secure and long-lasting underground conduit installation, perfect for industrial and home-based projects alike!
THWN-2 wire, for example, is a standard type for running through underground conduit. Use thick-walled conduit at least 3/4 inch in diameter for this application. Never use thin-wall EMT conduit for underground applications. Running wire through Schedule 40 PVC conduit.
We typically prefer using PVC conduit when running power to a remote location underground. That gives you a lot more protection over direct burial cable in the long run. In the end, just understand your options and take the safest or simplest route depending on your situation.
Considerations for electrical conduit in underground applications. Key factors to consider when selecting conduit include its protective qualities, ease of installation, installation cost, long-term durability, upfront costs, availability and lead times.
The conduit must extend at least 18 inches below the finished grade. Plastic conduit for physical protection must be heavy-duty Schedule 80 PVC conduit, not the standard Schedule 40 version. Heavy-duty Schedule 80 PVC can better withstand wayward lawnmowers and weed whip tools.
What type of cable is best for underground wiring? UF (Underground Feeder) cable is commonly used for underground wiring due to its water-resistant properties. How long does it take to install underground electrical wiring?
Low-voltage PVC conduits (under 600V) typically require a minimum depth of 18 inches in residential structures. In non-residential structures, PVC conduits need a burial depth of at least 24 inches.
Secure the Conduit. Securing the conduit in your underground wiring project holds it in place and keeps wires from getting crimped. After feeding the cable into the wall, screw the conduit outlet body to the exterior wall. Screw the other conduit body to the interior wall.
Tip #9: Ideal underground and aboveground conduit types. For long-lasting installations, stick with these conduit types: Underground: Go for nonmetallic Schedule 40 high-impact PVC for underground conduit installations. Make sure they’re UL approved for direct burial or concrete encasement. For fittings, use PVC solvent weld type.