How to Locate Non-Metallic Ducts and Pipes Using Ritelite Traceable Duct Rods
This is where traceable duct rods provide an effective solution. By introducing a conductive element into the duct, engineers can trace the position of the rod from above ground using a signal generator and cable locator. This makes it possible to identify duct routes, locate blockages and confirm the position of underground infrastructure without excavation.
Ritelite’s Cobra range of traceable duct rodding systems offers two different methods for locating non-metallic ducts and drains, providing flexible solutions for contractors working in telecommunications, utilities, drainage and civil engineering.
Why Non-Metallic Ducts Are Difficult to Locate
Without a traceable element, locating these types of ducts often requires excavation or visual inspection methods. Traceable rodding systems solve this problem by introducing a conductive rod into the duct, allowing a signal to be transmitted and detected from the surface.
When connected to a signal generator such as a CAT and Genny or other cable locating transmitter, the rod can be detected with a cable locator receiver above ground, typically at depths of up to around 3 metres depending on ground conditions.
Sonde vs Traceable Rod – Understanding the Difference
Although both methods allow underground detection, they perform slightly different tasks.
| Method | What it does |
| Sonde | Allows the operator to locate the exact position of the rod tip |
| Traceable Rod | Allows the operator to trace the full route of the duct |
| Combined System | Enables both route tracing and end-point detection |
Many modern systems combine both methods to provide maximum locating flexibility.
How Traceable Duct Rod Systems Work
A cable locator receiver can then detect this signal from above ground, allowing operators to:
- Trace the route of underground ducts
- Identify changes in direction
- Locate blockages or restrictions
- Map the position of non-metallic pipes and conduits
Because the rod physically travels through the duct, the detected signal accurately represents the position of the duct itself.
Two Methods of Duct Locating with Ritelite Cobra Traceable Rod
Quick Trace Cobra rods – provide traceability for a standard duct rodding system
Flexitrace systems – dedicated continuous trace systems with multiple detection modes
The diagrams below illustrates how these two methods of duct locating operate.
Quick Trace Cobra Duct Rod System
When connected to a signal generator such as a 33Hz CAT and Genny system, the copper conductors within the rod allow the full length of the rod to be traced from above ground. This makes it possible to follow the route of the duct as the rod progresses through the pipe.
For enhanced detection in challenging conditions, Quick Trace rods can also be fitted with a sonde, providing a stronger signal at the rod tip and allowing the end point to be located more precisely.
Because Quick Trace can operate both as a standard duct rod and as a traceable locating system, it offers a versatile solution for engineers who require equipment capable of performing multiple tasks on site.
Typical specifications include:
- Rod diameters: 6mm, 9mm and 11mm
- Lengths from 30m to 300m
- Compatible with industry standard 33Hz CAT and Genny locating systems
- Full length trace detection when connected to a signal generator
Flexitrace Continuous Trace System
Flexitrace systems combine two locating technologies in one system, allowing engineers to select the most appropriate detection method for the task.
Sonde Mode
In sonde mode, the integrated sonde end fitting allows operators to locate the exact position of the rod tip. This is particularly useful when identifying blockages or locating the end point of a duct.
Line Mode
Line mode allows the operator to trace the entire length of the rod as it travels through the duct, making it possible to map the route of underground pipes and conduits.
Trace Line Mode
Trace line mode combines the advantages of both detection methods, allowing operators to follow the duct route while also identifying the end position of the rod.
- Rod diameters: 4.5mm and 6mm
- Rod lengths from 20m to 150m
- Continuous trace functionality during deployment
- Compatibility with 33Hz CAT and Genny locating systems
Typical Applications for Traceable Cobra Duct Rods
Common applications include:
- Locating underground telecommunications ducts
- Tracing fibre optic conduit routes
- Identifying blockages in plastic drainage pipes
- Supporting CCTV drain inspection systems
- Mapping non-metallic utility infrastructure
- Confirming duct routes before excavation works
Because they combine mechanical rodding capability with electronic detection, traceable duct rods provide a practical solution for many underground inspection and installation tasks.
Choosing the Right Cobra Traceable Rod System
| Feature | Quick Trace | Flexitrace |
| Works as standard duct rod | Yes | No |
| Full route tracing | Yes | Yes |
| Sonde end detection | Optional | Integrated |
| Rod diameters | 6 / 9 / 11mm | 4.5 / 6mm |
| Rod lengths | 30–300m | 20–150m |
| Best suited for | Multi-purpose rodding and locating | Dedicated locating applications |
Explore Ritelite Cobra Traceable Duct Rod Systems
Explore the full product ranges:
Quick Trace Cobra Duct Rod Systems