Umair Gaines
Underground electric cables are often buried deep below ground and may not always be visible. Locating them is essential to prevent dangerous situations and expensive repairs caused by accidentally striking them during construction or excavation. There are various methods and tools available to detect and map these cables, such as utility locators, cable locators, and electromagnetic field devices. These tools can identify the depth, direction, and path of underground cables, helping to ensure safe and efficient construction projects. Locating underground electric cables is a crucial step to avoid costly mistakes and ensure the safety of workers and nearby communities.
| Characteristics | Values |
|---|---|
| Cable location methods | Passive electromagnetic signals, active electromagnetic signals, GPR, EM locators, acoustic pipe locators, AM radio |
| Cable locator types | Utility locators, pipe locators, cable locators, All Materials Locator (AML), Electrical Power Quality Analyzer (PQA) |
| Cable locator uses | Locating underground utilities, pipes, cables, wires, conduits, and lines |
| Cable locator features | Transmitter, receiver, output technologies (meters, displays, audible indicators), depth measurement, direction measurement |
| Cable locator considerations | Cable material (conductive or non-conductive), presence of trace wires, location strategy, safety, accuracy, efficiency, cost |
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What You'll Learn
Use a utility locator
Underground electric cables can be located using a utility locator, also known as a pipe and cable locator. These devices emit and detect electromagnetic signals, allowing them to identify the location, depth, and path of buried cables. They can also be used to map out the full extent of the cable without the need for any digging.
There are two ways to pick up electromagnetic signals from cables: passively or actively. Passive signals detect the electromagnetic field naturally produced by the utility, which is often sufficient for powered cables. Active signals are applied to the cable by a transmitter and are useful when there are multiple utilities that need to be differentiated or when the cable does not produce a strong enough signal by itself.
When choosing a utility locator, it is important to consider the specific requirements of your project. For example, EM locators are effective for identifying metallic objects but are not suitable for non-metallic pipes. GPR locators can detect various materials, while acoustic locators are designed for non-metallic pipes.
There are several manufacturers that produce utility locators, including Tempo Communications, RIDGID, Leica, and NOYAFA. These devices vary in terms of features, accuracy, and price, which can range from $500 to over $10,000.
Renting a utility locator may be a more feasible option for small, one-time projects instead of purchasing one. This allows access to high-end models that may otherwise be unaffordable. However, there may not be enough time to fully master the device before use. Alternatively, hiring a professional utility locating service can provide expertise and advanced technology to accurately map underground utilities.
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Know the type of cable
Knowing the type of cable is crucial when locating existing underground electric cables. Cables can be broadly categorized into conductive and non-conductive types. Conductive cables, made of materials like copper, steel, or aluminium, allow electrical signals to be transmitted along their length. On the other hand, non-conductive cables, which include most fibre optic lines, do not transmit electrical signals and can be more challenging to locate.
To locate conductive cables, a utility locator (also known as a pipe and cable locator) can be used. This device detects the electromagnetic signal produced by the cable, either passively or actively. Passive location relies on the electromagnetic signal naturally emitted by the cable, while active location involves sending a distinct signal through the cable via a transmitter. This method is particularly useful for powered cables.
Non-conductive cables, such as fibre optic cables, may require a different approach. Fibre optic engineers often install copper trace wires along non-conductive cables to aid in future location efforts. If trace wires are present, a utility locator can be used. However, if there are no trace wires, an All Materials Locator (AML) may be needed, especially if the cable is buried in non-rocky soil or away from tree roots.
Additionally, the depth of installation for underground electric cables can vary depending on the type of cable, soil conditions, and local regulations. Electrical standards, such as IEC requirements, must be followed during the installation process. It is recommended that electrical conduits be installed at least 18 inches below the ground surface, but deeper burial may be necessary in certain cases.
Other factors to consider when selecting the right underground electric cable include the level of protection required (armoured or unarmoured), the electrical load or current rating, and the size or cross-sectional area of the cable. Thicker cables are generally preferred to minimize voltage drop over distance.
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Prepare to dig
Before you start digging, it is essential to locate any underground cables to avoid damaging them. Striking a cable can be very dangerous, especially if it is a live electrical cable, and repairs can be costly.
Firstly, try to obtain plans of the underground infrastructure. If the cables are old, these plans may only be available on paper, but newer installations are usually mapped using GIS satellite systems and computer software. You can request these plans from the utility company, either by email, phone, or in writing.
Next, you will need to decide whether to hire a professional utility locating service or attempt to locate the cables yourself. Professional services can provide accurate and efficient mapping, reducing the risk of accidents and project delays. They are trained to use advanced equipment and can offer precision and compliance. However, if you are only handling a small, one-time project, it may be more cost-effective to rent an underground wire locator device or purchase a suitable tool.
If you choose to locate the cables yourself, there are several methods you can use. One way is to use a utility locator (also called a pipe and cable locator) to pick up electromagnetic signals from the utility. This can be done passively, using the electromagnetic signal naturally produced by the utility, or actively, by applying a signal to the cable with a transmitter. Active signals are useful when there are multiple utilities in close proximity or when the cable does not produce a strong enough signal on its own. Another method involves sending a low-frequency signal down one of the lines and picking it up with an AM radio dialled to the lower range of the AM band. Alternatively, you can try digging carefully along the assumed path of the cable to look for any markings or indicators.
Remember, safety should always be a top priority when working with underground cables. Before you start digging, make sure to turn off the breaker supplying the power to the area you are working in.
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Understand the risks
Underground electric cables are often preferred by utility companies because they are less likely to be damaged by weather events and can be kept out of sight. However, this means that any construction or excavation work carries the risk of striking these cables, which can be very dangerous and expensive. This is known as a "line strike".
Line strikes can cause power outages, electrical shocks, and fires. They can also be very expensive to repair or replace. Striking other underground utilities, such as water or gas lines, could cause flooding, gas leaks, or explosions, creating dangerous situations for workers and nearby communities. Therefore, it is always advisable to locate electric and other utility lines before beginning any project that involves digging.
There are many methods and tools available to locate underground electric cables. Conductive cables, made of materials such as copper, steel, or aluminium, can be located by transmitting an electromagnetic signal along the length of the cable with a transmitter device. This can be done passively, using the electromagnetic signal naturally produced by the utility, or actively, by applying a signal to the cable with a transmitter. Non-conductive cables, such as most fibre optic lines, may require an All Materials Locator (AML), especially if they are not buried in rocky soil or near tree roots.
It is important to note that not all underground cables are owned by utility companies. Some may be private lines installed by private companies or individuals. In such cases, it is the responsibility of the owner to locate these cables before any digging takes place. Private location services are available for a fee to inspect properties and locate any underground pipes, conduits, and wires. Additionally, local services, such as "Call Before You Dig" or "Dig Safe", can help mark the location of utilities for free. However, these services may not cover all types of lines or secondary lines on private property. Therefore, it is crucial to understand the limitations of these services and conduct thorough research before beginning any project involving digging.
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Hire a professional
Locating existing underground electric cables is a complex process that requires specialised tools and expertise. While there are several methods and devices available for detecting and mapping underground utilities, hiring a professional is often the best course of action. Here are several reasons why engaging the services of a qualified expert is beneficial:
Safety
Professionals are trained to accurately locate utilities, reducing the risk of accidents such as hitting electrical lines or gas pipes. This ensures the safety of workers and prevents potential hazards like electrical shocks, fires, or explosions. Striking underground electrical cables can also lead to power outages, affecting many people.
Precision
Experienced professionals utilise advanced equipment and technology, such as Ground-Penetrating Radar (GPR) and Electromagnetic (EM) locators, to provide highly accurate utility mapping. They can identify and differentiate various underground cables, pipes, and conduits, ensuring that all utilities are correctly identified and mapped. This precision helps prevent unnecessary digging and repairs, ensuring your project proceeds smoothly.
Efficiency
By accurately locating utilities, professionals help avoid damage to critical infrastructure, reducing project delays and downtime. Clear maps of the underground layout enable efficient project planning and execution, saving time and resources.
Cost Savings
While hiring a professional utility locating service incurs upfront costs, it can ultimately save significant money. Accurate mapping prevents costly repairs and project interruptions caused by striking unmarked utilities. By avoiding damage to underground utilities, you can minimise financial losses and keep your project within budget.
Compliance
Professional utility locating services ensure compliance with regulations and industry standards. They are familiar with specific state and local guidelines for locating underground utilities, reducing the risk of non-compliance and associated penalties.
In conclusion, hiring a professional to locate existing underground electric cables is a prudent decision. Their expertise, specialised equipment, and industry knowledge ensure safety, precision, efficiency, and compliance. While it may seem costly upfront, it can save money in the long run by preventing accidents, reducing downtime, and minimising repair expenses.
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Frequently asked questions
You can use a utility locator, also known as a pipe and cable locator, to pick up electromagnetic signals from the utility. This method does not require any digging.
There are two types of utility locators: passive and active. Passive locators use the electromagnetic signal naturally produced by the utility, while active signals are applied to the cable by a transmitter.
Using a utility locator can help you trace and mark the full extent of the cable without digging. This prevents damage to underground utilities, reducing the risk of accidents, power outages, and costly repairs.
Aside from using a utility locator, you can also hire a private contractor or rent equipment to trace the line. Additionally, you can attempt to locate the cable by carefully digging along the assumed path and looking for indicators such as "buried electric line below" tape.
