Touch voltage
Türkçe: Dokunma gerilimi
The voltage that appears between two points a person can touch at the same time (for example hand and foot) during a fault.
// EXPLANATION
When the metal frame of a faulty appliance becomes live, a touch voltage appears between a person touching it and the floor. In dry locations anything above roughly 50 V AC is generally considered dangerous; in wet locations the limit is lower. Good earthing, equipotential bonding and fast protective devices both lower this voltage and shorten its duration.
// ALSO KNOWN AS
touch voltagecontact voltage
// RELATED TERMS
Earthing (grounding)An arrangement that connects the conductive parts of an installation to the ground through a low-resistance path so fault current has a safe way out.
Residual-current deviceA safety device that watches the difference between line and neutral currents and opens the circuit within a fraction of a second when that difference exceeds a threshold.
Earth resistanceThe resistance an electrode presents to the surrounding soil; the lower it is, the more easily fault current flows into the ground.
