Wiktor Wise
Underground electrical lines can be difficult to locate, and it is recommended to hire a professional electrician or utility locator with the necessary tools and expertise. However, if you'd like to try to locate them yourself, there are several methods you can use. You can attempt to carefully excavate and follow the line, but this is time-consuming and labour-intensive. Alternatively, you can use a metal detector or a specialised underground wire detection device, which can detect electromagnetic signals and are ideal for locating cables and wires. You can also use old-fashioned divining rods, which are said to work on buried cables and conduits. Another method is to send a low-frequency signal down one of the lines and pick it up with an AM radio. Finally, you can refer to building plans, which may provide information on the location of underground wiring, or look for markers or flags that indicate the location of underground wiring.
| Characteristics | Values |
|---|---|
| Method | Contact a professional electrician or utility locator |
| Check building plans | |
| Look for markers | |
| Use a metal detector | |
| Use a radio | |
| Use underground wire and cable locators | |
| Use old-fashioned divining rods |
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What You'll Learn
Contact a professional electrician or utility locator
If you are not experienced with locating underground wiring, it is recommended to hire a professional electrician or utility locator who has the necessary tools and expertise. Professional utility locating companies have trained and certified technicians who are skilled in using advanced technologies like ground-penetrating radar (GPR) and electromagnetic (EM) locating to accurately identify and mark the location of underground utilities.
GPR equipment sends a signal into the ground, bouncing off buried material to create a reading that determines the approximate depth and location of the utility or material in question. EM locators, on the other hand, transmit an electromagnetic signal into the ground to detect its interaction with underground metallic objects, such as electrical cables.
Professional utility locators have the knowledge and experience to accurately interpret data from GPR and EM readings. They can help ensure that your project proceeds smoothly, saving you time and reducing risks. Before starting any digging project, it is important to call 811 to connect with local utility companies, who will mark the approximate locations of public underground utilities on your property. However, it is important to remember that 811 contractors only provide the approximate location of public utilities and not private utilities, which make up over 60% of all buried infrastructure in the U.S.
Professional companies offer more than just locating services. They provide utility mapping, data management, and consultation services, helping project managers and contractors make informed decisions. They adhere to industry standards and regulations, ensuring that all locating activities are performed safely and legally, preventing accidents and legal issues. Additionally, professionals invest in the latest equipment and technologies, ensuring the most accurate and reliable results. Their equipment is regularly maintained and calibrated for optimal performance.
Therefore, contacting a professional electrician or utility locator is a recommended course of action when dealing with buried electrical lines. They can provide valuable expertise, advanced technology, and compliance with safety and legal regulations.
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Check building plans for wiring locations
If you are looking to find buried electrical lines, there are several methods you can use. One of the first steps you can take is to check building plans for wiring locations. This is a good idea if the wiring was installed during construction of the building, as the plans may offer information on the location of underground wiring.
Building plans can take the form of wiring diagrams, which are useful for electricians to understand where the points of damage lie in the whole network. They can also help electricians avoid sharp places and open live wires. House wiring diagrams can be created before installation, showing the layout and components of a single-phase circuit. These diagrams can be made using drag-and-drop symbols, which are placed according to the building layout. It is important to ensure that there are enough outlets for each room, and that outdoor lighting is also considered.
When creating a house wiring diagram, it is important to consider safety. Live wires should not be left open, and the layout should be designed to avoid any leakage or cross-connection. Wires are often colour-coded, with black, blue, and yellow representing hot wires, and white and grey representing cold wires. However, even cold wires may still carry electricity and are not safe to touch. It is also important to label wires and circuits clearly, to avoid confusion.
In addition to checking building plans, there are other methods for locating buried electrical lines. One option is to use a metal detector, which can detect wires with a metal casing or conduit. Another method is to send a low-frequency signal down one of the lines and pick it up with an AM radio. This can help confirm the location of buried power cables.
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Look for flags or markers in your yard
If you're looking to find a buried electrical line, one of the first steps you can take is to look for flags or markers in your yard. Utility companies often use flags or markers to indicate the location of their underground wiring. These markings are usually made with paint and are colour-coded to indicate the type of utility line. Electrical lines, for instance, are typically marked in red, while blue indicates water lines, orange marks cable television lines, green is for sewage, and yellow flags are placed on top of underground gas lines.
In the United States, you can call 811 to request utility marking on your property. This free service will send a representative to your home to mark all buried utilities, including electrical lines. The markings are generally considered valid for about a month, as the paint can wash off over time. It's important to wait until all utilities have been marked before starting any digging projects. If your work will be delayed beyond the initial 30-day marking period, you should call again and request a re-marking.
Additionally, it's recommended to leave a safety buffer of at least 2 feet on each side of the marked utility lines when planning your digging or landscaping projects. This helps to ensure that you don't accidentally damage any underground utilities, which could result in dangerous repercussions, including utility outages, personal harm, and costly repairs.
If you notice any flags or markers in your yard, be sure to contact your utility company to confirm if they are related to underground electrical wiring. It's also a good idea to ask the person marking the lines about the depth of each type of buried utility and make a note of it for future reference. This information can be crucial when planning any digging or construction projects on your property.
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Use a metal detector
Metal detectors can be used to find buried electrical lines. Most metal detectors can identify underground cables as long as they are within the machine's range. The detector's signal can penetrate plastic pipe and detect the metallic wire inside the power line. If the conduit is made of metal, it will be easier for the detector to locate it.
Before using a metal detector, it is recommended to review a utility map of your area, if available. This will help you determine the location of any telecom or gas pipelines that may be underground, so you can avoid damaging them.
When using a metal detector, swing the detector loop back and forth over the area until the signal indicates a metal target. Ignore small, choppy signals and look for a strong, repeatable signal. Walk forward while swinging the coil, following the path that the wires are taking. Mark the ground with a small dot where you believe the wire originates, and continue this process, marking the ground every few feet. Once you have reached the end of the wire, go back and connect the dots with a continuous paint line.
Some metal detectors have specific features that can assist in locating power lines. For example, the Ace 250 has an all-metal search mode that will detect every type of metal, while the VLF detector can filter out objects depending on the environment.
In addition to metal detectors, there are other tools that can be used to locate buried electrical lines, such as electronic stud finders and voltage detectors.
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Send a low-frequency signal down the line
If you want to find a buried electrical line, one method is to send a low-frequency signal down the line. This can be achieved by using a portable AM radio tuned to the lower range of the AM band. By sending a low-frequency signal down one of the lines, you can then pick it up from the surface with the AM radio.
To induce a strong signal, you can use a narrow gauge wire (18 or 20 gauge). Wind the wire half a dozen times around the spark plug cable of a four-stroke engine, such as a lawnmower. Attach the other end of the narrow gauge wire to one end of the cable you want to find, making sure it is disconnected from any power source. Then, start the lawnmower or other four-stroke engine.
With the engine running, you can now use the AM radio to sweep over the ground surface near the location you believe the cable is buried. For example, start where the cable leaves a building or enters a shed. The engine's magneto will induce a signal onto the buried cable, which the AM radio will pick up as pulsed static.
It is important to note that this method is most effective when the cable is not buried too deeply. You should be able to track the signal by staying right above the cable as you move the AM radio over the ground surface.
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Frequently asked questions
If you don't want to hire a professional electrician, you can use a metal detector or a specialised underground wire detection device.
These devices emit and detect electromagnetic signals, making them ideal for locating cables and wires. They also have built-in signal strength indicators. Some devices can detect underground utilities' depth, direction, and path.
Some examples include the Noyafa NF-826 Underground Cable Locator Pipeline Detector & Wire Tracker, which has a max detection range of 2m, and the Tempo 501 Underground Cable and Wire Locator, which offers three methods of connection.
