Leave plenty of excess cable at each end of the conduit run, to allow for an electrician to continue the hookups inside the house and inside the garage.Applying cable lubricant will make it easier to pull the cable. Having a helper feed the cable from one end as you pull on the fish tape makes this job much easier. Attach the end of the UF cable (or individual THWN wires) to the end of the fish tape, then carefully pull the cable back through the conduit.
Extend a fish tape down through one end of the conduit all the way through to the opposite side.At each end, attach sweep fittings connected to vertical lengths of conduit extending up out of the trench. Lay the conduit into the trench, solvent-welding the joints of individual sections with PVC solvent glue.Then, run the conduit beneath the sidewalk through the hole you bored. If necessary to cross sidewalks, dig the trench down to the required depth on both sides, then bore a lateral hole under the sidewalk by driving a piece of rigid pipe or conduit horizontally.If you have to dig a long trench, you may want to consider renting a trenching machine for this job. Use a trenching shovel to dig a narrow channel from the house to the garage, at the recommended depth for the type of installation you are doing.The shortest, most direct route is always best. Layout a pathway for the wiring run on the ground from the house to the garage, using rope or a garden hose.Here, the conduit must be at least 18 inches deep, and again the individual conducting wires inside the conduit should carry a "W" waterproof rating, such as THWN-2. Running wire through Schedule 40 PVC conduit.Never use thin-wall EMT conduit for underground applications. Use thick-walled conduit at least 3/4 inch in diameter for this application. THWN-2 wire, for example, is a standard type for running through underground conduit. In this method, the conduit can be as shallow as 6 inches deep, and the individual conducting wires inside should have a "W" labeling to indicate they are waterproof. Running wire through rigid galvanized metal conduit.At the bottom of the trench, a sweep fitting is attached to the ends of the vertical conduit, and the cable is snaked through the elbows and up into the conduit at both sides. Further, the vertical runs where the cable descends into the ground at the house side and emerges up from the ground at the outbuilding side must be housed in rigid conduit, usually PVC. This is known as direct burial, and if you do this, the UF cable must be at least 24 inches below the surface of the ground, to minimize the chance of the cable being pierced by routine shoveling.
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