Fiber Optic Tool- Underground Wire Locator NF-816

When first introduced approximately 40 years ago, underground wire locator needed to do little more than find buried water, gas, or sewer lines. Today, locating has become more complex as telecommunications cables join utility lines in the underground environment. Surprisingly, though, today’s underground cable locators rely on the same basic technology found in their early counterparts–injecting an electrical signal onto the cable being located.

Since its development, the cable locator has generally consisted of two parts–a transmitter and a receiver. The transmitter puts an electrical signal onto the cable or pipe being traced, while the receiver picks up that signal, allowing the locator operator to the trace the signal’s patch and follow the cable being located.

The electromagnetic field created by the transmitter can usually be set to a specific frequency, depending on the type of conductor in the cable. Frequency choices can range from less than 1 kilohertz to about 480 kHz. With this range of frequencies, it is important to keep one thing in mind, according to Jim Grimes, Metrotech regional manager. “You want to start out at the lowest frequency, and if that frequency works, don`t change it,” he explains. “Lower frequencies seem to bleed over less and stay on the conductor you are attached to better.”

While the basic technology for locating hasn`t changed much, the ways for getting the signal onto the cable have. In addition to passive signals, which do not require the use of a transmitter, the three most common methods of sending signals are direct connect, general induction, and inductive coupling. In the inductive coupling method, the cable must be grounded to form a complete circuit path.

As its name implies, the direct-connect method allows you to physically attach your transmitter to the cable to be located. That may mean connecting at a cabinet or a pedestal and then gaining access to the shield that surrounds the cable, which is usually grounded at this point.

If directly attaching to the cable is impossible, then the induction method may be the logical choice. Here, you place the transmitter on the ground directly over the cable. Once the transmitter is turned on, it induces a signal into any nearby conductor within its range. This, of course, can lead to problems if there are multiple cables buried within close proximity because the signal could be picked up on a cable other than the one you are trying to trace.

Although inductive coupling doesn`t let the user directly connect to the cable, it provides a higher level of confidence than does general induction. It uses a donut-shaped coupling device that surrounds the cable and emits a signal onto the cable.

FiberStore offer NF-816 underground wire finder, it is designed to locate the path of non-energized wires behind walls and underground. The NF-816 underground cable wire locator can locate a specific circuit breaking, point out wires before drilling and verifying dig sites underground. This underground wire tracer effective range is up to 3 feet deep and up to 1000 feet in length.

Key Features

  • Find wire on all types of connected operating Ethernet switch /Router/PC terminal
  • Rapidly find the target wire from among plenty of telephone wires
  • Rapidly find the target wire from among plenty of network wires
  • It can take place of cable tester
  • Compare the volume of the “tout” sound and the brightness of the signal indicator. Then you can find the target wire which has the highest volume and brightest indicator


  • Trace telephone wire/LAN cable
  • Trace wire in electrical system
  • Verify LAN cable condition
  • Continuity test
  • DC level testing function
  • Bright white LED flash light


  • Output voltage: 9Vp-p
  • Battery: 9V DC
  • Carrier: 44.75KHz
  • Audio modulation: 900HZ
  • Size: transmitter: 49*125*33 mm receiver: 43*168*27mm
  • Color: yellow+ black

Generally speaking, a network cable tester is a device that test for different types of faults in cables like continuity, dislocation, open circuit, short circuit, cable pairing faults, or indications like shielding indication, straight cable/ cross over cable indication, etc. We aso provide various types of fiber testers, from basic to complicated, and all of high quality and good price. If you need this Underground Cable Locator NF-816 in a large quantity, we will provide you a special discount.