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In 3 phase 4 wire system what does the 4 wires indicate?

Nicholas Rivera

in Schools

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Heather Maxwell on July 29, 2019

A four-wire system is similar to that of the three wires of the system. A system of three threads is of a delta service transformer that comes in. For example, if the service is 480, there will be 480 volts between each of the three legs. The delta is less than a ground. In a system of four threads, the service is of a star of the transformer. The turn of wire is a ground. For example, if the service is 480, there will be 480 volts between each of the three hot legs. If you measure between one of the hot legs to the loop of wire to ground (earth), we will measure 277 volts. Many times the wye (four-wire) system is used in places where higher voltage is needed to run the motors (480) and superior service to 110 is required to run the lighting (277). No transformer is needed to get the 277. Only simplifies the wiring. Response of three-phase, four-wire, system comprises three ' hot 'conductors which are correctly called 'line conductors' and a 'neutral conductor' ( not a 'ground' conductor, as indicated in the original response). The actual voltages depend on the electricity standards of your country. In Europe, for example, the voltage between any pair of line conductors (so-called "line voltage) is 400 V, while a voltage between any phase conductor and the neutral conductor (called a 'phase voltage') is 230 V. the potential of The neutral conductor is approximately that of the earth, which by general agreement, is considered to be zero volts.


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