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2. Earth-leakage circuit breaker - Wikipedia

   en.wikipedia.org/wiki/Earth-leakage_circuit_breaker

   A wire break in the fault to load section, or in the earth to ground section, will disable operation of the ELCB. Requirement of an additional third wire from the load to the ELCB. Separate devices cannot be grounded individually. Any additional connection to Earth on the protected system can disable the detector.

3. Residual-current device - Wikipedia

   en.wikipedia.org/wiki/Residual-current_device

   A residual-current device (RCD), residual-current circuit breaker (RCCB) or ground fault circuit interrupter (GFCI) [a] is an electrical safety device that interrupts an electrical circuit when the current passing through a conductor is not equal and opposite in both directions, therefore indicating leakage current to ground or current flowing to another powered conductor.

4. Insulation monitoring device - Wikipedia

   en.wikipedia.org/wiki/Insulation_monitoring_device

   An insulation monitoring device monitors the ungrounded system between an active phase conductor and earth.It is intended to give an alert (light and sound) or disconnect the power supply when the resistance between the two conductors drops below a set value, usually 50 kΩ (sample of IEC standard for medical applications).

5. Electrical fault - Wikipedia

   en.wikipedia.org/wiki/Electrical_fault

   In an electric power system, a fault or fault current is any abnormal electric current. For example, a short circuit is a fault in which a live wire touches a neutral or ground wire. An open-circuit fault occurs if a circuit is interrupted by a failure of a current-carrying wire (phase or neutral) or a blown fuse or circuit breaker.

6. ANSI device numbers - Wikipedia

   en.wikipedia.org/wiki/ANSI_device_numbers

   63 - Pressure Switch Detector; 64 - Ground Protective Relay; 64F - Field Ground Protection; 64R – Rotor Earth Fault; 64REF – Restricted Earth Fault Differential; 64S – Stator Earth Fault; 64S - Sub-harmonic Stator Ground Protection; 64TN - 100% Stator Ground; 65 - Governor

7. Ground continuity monitor - Wikipedia

   en.wikipedia.org/wiki/Ground_continuity_monitor

   A GCM or ground continuity monitor (also called a ground integrity monitor or ground continuity tester) is an electrical safety device that monitors the impedance to ground of a temporary electrical circuit and can provide indication (or protective trip) in the event impedance rises to an unsafe value. A GCM is either an external testing device ...