Non-contact phase indicator. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Indicators, detectors
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If you take a neon lamp by the glass case and touch one of its terminals to the phase wire of the mains, the lamp starts to glow. The current that causes the glow flows through an electrical capacitance between the fingers and the internal electrodes of the lamp.
This effect can be used to make a simple phase wire indicator.
A metal pin is soldered to one of the terminals of the lamp. You should choose the output that produces the brightest glow. A slightly stretched PVC tube is put on the lamp base. The cavity in the tube is filled with epoxy glue using a straw for cocktails (see figure).
The indicator can be used with a wide variety of small lamps: ТН-0,5; MN-6, thyratron MTX-90, etc. The sensitivity of the indicator is somewhat lower than that of a traditional indicator with a resistor.
Author: S.L.Dubovoy, St. Petersburg, Russia
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