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Read More. Your Privacy Rights. Glue or fasten the pipe together with approved fittings and adhesives. Place the pipe into the trench. Secure the pipe where it rises above ground at 30 to 36 inches Some codes may require the conduit to continue up to 8 feet 2. A PVC "expansion joint" is often required between the point the pipe emerges from the ground outdoors and penetrates a wall or enters an enclosure mounted on the wall. Expansion joints allow for changes in grade that can result from frost heaves, and for thermal changes along the pipe, and must be employed where required.
Check your local code for this requirement. Expansion joints are available at most home centers that sell electrical conduit pipe. As with direct-burial cable installations, your local inspector may want to view your conduit installation before you backfill your trench. Push the "fish tape" or "snake" in one end of the pipe until it exits the opposite end.
Protect any existing wires from damage from the snake by placing cardboard or other insulator between the snake and wires at the opening of the pipe. Steel snakes will conduct electricity if allowed to rub through insulation of an energized wire, so shut off power if possible before installing the snake or pulling wire. Hook the conductors to the snake and tape together. Have a helper "feed" and guide the wires as you withdraw the snake from the pipe.
Do not pull fast or hard; slow and steady tension is the key. Do not allow the new wires to constantly rub existing wires in the same place as they are pulled into the pipe, as doing so they may wear away insulation and expose harmful voltages present on the conductor s when energized. Aerial installations should only be done for short lateral runs, and where they may be installed so that traffic vehicle or pedestrian below will not create a hazard by contact. Additional clearance requirements must be observed when passing over driveways, spas, pools, roofs or near windows and doors.
The strain relief and support fittings should be secured to the building framing members, not just to plywood sheathing of the structures. These fittings are seldom found in home centers, but are available at most full-line electrical distributors. This wiring method should be used only if the other two are not suitable. Keep in mind that these cables will stretch a bit when under high electric load or in direct sunlight.
They will also be strained under the weight of snow and ice build up, and could break mid-span or rip from supports. If it's outdoors, you can use EMT tubing with "rain-tight" fittings - do not use set-screw concrete tight fittings. If it's underground, then you should use PVC. Yes No. Not Helpful 10 Helpful 4. My house is built on piers. It is open air under the ground floor. The joists are about three feet above grade. I need to run a wire under the floor and will put it through holes in the joist.
The wire will not be exposed to sun or rain. Can I use Romex or do I need direct burial cable? The safer bet is to use UF, or ask your inspector what he'd like to see in this situation.
Not Helpful 0 Helpful 1. How do I run a cable from my house to a building approximately 10 meters away so I can have power for an outdoor fish pond? Upnorth Here. You may run the cable underground or overhead, as described in the article above. Not Helpful 0 Helpful 0. Not all outdoor wiring requires a conduit.
However, conduit may offer some advantages, as mentioned in the article above. Many regulations permit direct burial of a suitable cable in a proper trench without conduit, or using an overhead cable.
Is encased wiring to an outer garden building allowed to lie on the ground along a boundary fence? Wiring in conduit MUST be supported or buried. The conduit may be any approved method - but the easiest for most people is Schedule 40 PVC.
How could I install a new electric box outside the house for new floodlights on the front of the house? Find a convenient location inside the house for taking the wires from an existing circuit through the outside wall, whether it's in the attic, basement or at the top or bottom of an existing interior wall.
Drill a hole for the cable and attach an exterior-rated junction box on the outside end of hole. Either attach your lighting to that box or run conduit or UF cable to another exterior-rated box at the desired location.
Add a switch to the circuit inside the house to control the outside floodlights. Include your email address to get a message when this question is answered. Circuits for use in garages and outdoors will most likely require Ground Fault protection.
Helpful 0 Not Helpful 0. Some jurisdictions permit shallower trenches for rigid metal conduits -- perhaps as little as 6 inches Backfill surrounding conduit or cables must typically be smooth granular material without rocks. You may be required to place a "warning" indicator, such as marked plastic tape, on top of your buried wiring, beneath the top surface of your backfill, to serve as a warning to future excavators.
UF cable is most often NOT allowed to serve a pool pump and filter assembly. Check with your inspector. The PVC pipe method is however, suitable for pool pumps.
UF cable generally is rated like its NM counterpart. Remember to pull an insulated grounding wire with EACH circuit. Most typical residential services are volts, a ground is required for any single volt circuit and each volt circuit. Use electrical pipe and fittings only. Schedule 40 and Schedule 80 PVC have the same outside diameter, and use the same fittings. The difference between the two types there are additional schedules, too , is their density.
The Schedule 40 PVC has much less resistance to breakage from impacts, etc. Submit a Tip All tip submissions are carefully reviewed before being published. Ask your inspector what depths are required for trenches in your area. Helpful 5 Not Helpful 3. Helpful 3 Not Helpful 6. Swimming pools and the like have special considerations and as a result not covered in this wiki. Helpful 0 Not Helpful 4. Show your inspector plans for aerial spans. Include drawings that show locations of windows, roofs and heights above grade.
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