• Non-contact Voltage Detector

Non-contact voltage detector plays an important role mostly in electrical industries since the user is able to investigate the voltage without making a contact with the testing object. The Modiewark is a non-contact voltage detector that distinguishes the presence of an alternating electric or electromagnetic field as both a proximity and touch device. Its unique switching action allows for the identification of alternating currents at a distance between 200 mm and 300 mm from a voltage source from 110 volts to 750,000 volts. The Modiewark has been used by industry professionals since the early ’70s for live or dead voltage determination of overhead power lines and underground power at the URD test point. Firstly, as a proximity device to determine live or dead situations and then as a touch device to verify the detector has physically reached the AC field around designated mains under test. The Modiewark can also be used indoors on the 240/110-volt setting, tracing voltage sources from power distribution boards and cable fault detection. The unique nature of the sensor plate within the unit allows for directional checks such as checking low voltage when high voltage is nearby. Induced voltages on isolated conductors are checked by increasing the Modiewarks sensitivity.

Radiated field strength increases with voltage and decreases with earth shielding. The radiated field from a cable of closely bunched conductors supplied by three-phase power tends to cancel. The detecting distance of a 240-volt single live wire is approximately 100mm and with a bunched neutral and earth, as a flexible cable, the distance is 50mm. Non-contact voltage detectors work by sensing a very small amount of current that is capacitively coupled from the live circuit to the tester and back to the ground. Non-contact voltage detectors light up when they detect this current without needing to make direct contact. A built-in sensor at the tip of the detector detects the presence of voltage when touching a conductor, outlet, or supply cord. By holding the tool, you are the ground reference through capacitive coupling. When the tip glows red and the unit beeps, you know voltage is present.

To use a non-contact voltage detector, the user only needs to touch the handle of the detector to the wire or, if you’re testing an outlet, the surface of the tester needs to be placed parallel to the perpendicular. Most testers will light up and/or make a sound to confirm voltage is present. In the Modieward Non-Contact Voltage detector, the beeper sounds confirm when voltage is detected. Before beginning using the non-contact voltage detector, the user must need to make sure to read and follow the instructions and warnings that come with the device. Each Modiewark tester has a slight difference from each tester. In order to test electrical wires and test if a wire is live as the verifying step, first the user needs to place the surface of the non-contact voltage detector perpendicular to the known live wire or system. Then use the tester to check if there is any voltage in the wire or in the system that the user needs to check. Finally, test against a known voltage source again to ensure the tester’s batteries were not empty or that the detector was not malfunctioning during the test.

As earlier, industry professionals use the Modiewark to detect voltages in overhead and underground power lines. Firstly, as a proximity device to determine live or dead situations, and secondly as a touch device to verify that the detector has physically reached the AC field. The Modiewark unit also works indoors on the 240/110-volt setting, tracing voltage sources from power distribution boards and cable fault detection. The unit has an inner sensor plate for directional checks, such as checking low voltage when high voltage is nearby. Induced voltage on isolated conductors is checked by increasing the Modiewark sensitivity. Some more typical uses of the Modiewark include Identifying live conductors, Fault finding through flexible cables, Checking equipment grounding, Neon lighting servicing, Tracking live wires above and below ground at URD test points, Phasing conductors, and High-frequency radiation detection. With that user will be able to ease the voltage detection without making a contact with the testing surface since the Modiewark makes the task easier.

Products to compare:
Comparing Products