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2. Four-terminal sensing - Wikipedia

   en.wikipedia.org/wiki/Four-terminal_sensing

   Four-point measurement of resistance between voltage sense connections 2 and 3. Current is supplied via force connections 1 and 4. In electrical engineering, four-terminal sensing (4T sensing), 4-wire sensing, or 4-point probes method is an electrical impedance measuring technique that uses separate pairs of current-carrying and voltage-sensing electrodes to make more accurate measurements ...

3. Measurement category - Wikipedia

   en.wikipedia.org/wiki/Measurement_category

   Measurement category III is for measurements performed in the building installation. Examples are measurements on distribution boards, circuit-breakers, wiring, including cables, bus-bars, junction boxes, switches, socket-outlets in the fixed installation, and equipment for industries. [2]

4. Contact resistance - Wikipedia

   en.wikipedia.org/wiki/Contact_resistance

   That means that the contact resistance of the probes and their leads is inseparable from the resistance of the contact area to be measured, with which they are in series. In a four-terminal measurement, the current used to make the measurement is injected using a second, separate pair of leads, so the contact resistance of the measurement ...

5. Circuit breaker (overcurrent) - Wikipedia

   en.wikipedia.org/wiki/Circuit_breaker_(overcurrent)

   Power circuit breakers and medium- and high-voltage circuit breakers used for industrial or electric power systems are designed and tested to ANSI or IEEE standards in the C37 series. For example, standard C37.16 lists preferred frame size current ratings for power circuit breakers in the range of 600 to 5000 amperes.

6. 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, more specifically a form of Earth-leakage circuit breaker, that interrupts an electrical circuit when the current passing through line and neutral conductors of a circuit is not equal (the term residual relating to the imbalance), therefore ...

7. Continuity test - Wikipedia

   en.wikipedia.org/wiki/Continuity_test

   In electronics, a continuity test is the checking of an electric circuit to see if current flows (that it is in fact a complete circuit). A continuity test is performed by placing a small voltage (wired in series with an LED or noise-producing component such as a piezoelectric speaker) across the chosen path.

8. Intelligent electronic device - Wikipedia

   en.wikipedia.org/wiki/Intelligent_electronic_device

   Unlike the RTUs, IEDs are integrated with the devices they control and offer a standardized set of measuring and control points that is easier to configure and require less wiring. Most IEDs have a communication port and built-in support for standard communication protocols ( DNP3 , IEC104 or IEC61850), so they can communicate directly with the ...

9. Utilization categories - Wikipedia

   en.wikipedia.org/wiki/Utilization_categories

   60947-4-2 AC-58b The control of a hermetically sealed refrigeration compressor motor with automatic reset of the overload trips: Intermittent operation 60947-4-2 AC-140 Control of small electromagnetic loads with holding current ≤ 0.2 A; e.g. contactor relays 60947-5-2 A: Protection of circuits, with no rated short-time withstand current ...