| Entry: Non-Contact Voltage Sensor originally posted by ReAct |
| A pen-shaped, battery-powered device used to indicate the presence of alternating current by emitting a steady or pulsing glow. Some models are also equiped with audible signals such as a tick or tone of some kind. They are activated by the changing electrical field surrounding most sources of alternating current, and generally work within a range of 24 to 600 volts depending on the model. These are useful tools for safely locating potential shock hazards without exposing oneself to danger. However, it is important to note that they are not infallible and sometimes indicate a danger where none exists. More importantly, but much less frequently, there are some rare circumstances under which they will not activate despite the fact that a potentially lethal current is flowing in the circuit under test. These devices are also known as "Tickers" and "Hot-Sticks."  |
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