This is a kind of voltage appeared in meter to any metal conductors or any metal due to adjacent conductors. It happens due to capacitive coupling between conductors (ungrounded conductors basically). But there is no voltage source or any type of load connected with this. This phantom voltage is found in an open conductor which is around 2 to 3 volts. During conductor inspection, conductors show this reading due to impedance of the measuring instrument.
Examples of phantom voltage:
- Fridge metal side
- Metallic light box or fixtures
- Exposed metal conduit
- Junction box used in electrical line which are metallic
- Neon sign (ungrounded)
- House wiring
Cause of phantom voltage – Due to capacitive coupling
Solution of phantom voltage – Need to use low impedance instrument or meter to test conductors or to measure conductor voltage.
Phantom voltage is harmful or not – No, basically it is not harmful to our body.