To unground a system is to disconnect its neutral or reference point from the earth mass. This is usually done during maintenance to isolate a section of plant, or permanently in specific IT systems where floating the circuit prevents a single earth fault from tripping the power. The process requires strict safety protocols to ensure no residual charge remains.
Make sure you unground the test setup before you try to inject the high voltage signal.
Also heard as
- Ungrounded
- floating
- isolated
Related terms
Earthing
The practice of connecting electrical equipment and systems to the general mass of the earth.
Ground
A direct, low-impedance electrical connection to the earth, establishing a zero-voltage reference point for a system.
IT system
Earthing arrangement in which the source is isolated from earth or earthed only through a high impedance.