Common Phase Voltages On Wye Services - Electro Industries Shark 200 Installation & Operation Manual

The phasor diagram shows the 120
The phase-to-phase voltage in a balanced three-phase wye system is 1.732 times the
phase-to-neutral voltage. The center point of the wye is tied together and is typically
grounded. Table 1.1 shows the common voltages used in the United States for wye-
connected systems.
Phase to Ground Voltage
120 volts
277 volts
2,400 volts
7,200 volts
7,620 volts
Usually a wye-connected service will have four wires: three wires for the phases and
one for the neutral. The three-phase wires connect to the three phases (as shown in
Figure 1.1). The neutral wire is typically tied to the ground or center point of the wye.
In many industrial applications the facility will be fed with a four-wire wye service but
only three wires will be run to individual loads. The load is then often referred to as a
delta-connected load but the service to the facility is still a wye service; it contains
four wires if you trace the circuit back to its source (usually a transformer). In this
type of connection the phase to ground voltage will be the phase-to-ground voltage
indicated in Table 1, even though a neutral or ground wire is not physically present at
the load. The transformer is the best place to determine the circuit connection type
because this is a location where the voltage reference to ground can be conclusively
identified.
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angular separation between the phase voltages.
Table 1: Common Phase Voltages on Wye Services
1: Three-Phase Power Measurement
Phase to Phase Voltage
208 volts
480 volts
4,160 volts
12,470 volts
13,200 volts
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