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 2 Corrected spelling. edited Mar 7 at 2:08 C. Lange 53311 silver badge1515 bronze badges Voltage, by definition, is the potential difference in charge between two points. In your image, Point R, by itself, does not have a voltage because it is only one point. Point R with respect to Y (RY = two points) does. Point R with respect to B (RB = two points) does as well. Point R itself can be apart of more than one voltage simply because you require two points to determine a voltage. In a delta system, the two points required to measure a line voltage also happen to be the same two points connected across the phase. I think youyour confusion may come from being familiar with wye systems. Don't let the architecture fool you though! In the image below, Point A has no voltage on its own. The phase voltage is still from Point A to Neutral (AN). In the case of the wye, the line voltage is between points A and B (AB). Voltage, by definition, is the potential difference in charge between two points. In your image, Point R, by itself, does not have a voltage because it is only one point. Point R with respect to Y (RY = two points) does. Point R with respect to B (RB = two points) does as well. Point R itself can be apart of more than one voltage simply because you require two points to determine a voltage. In a delta system, the two points required to measure a line voltage also happen to be the same two points connected across the phase. I think you confusion may come from being familiar with wye systems. Don't let the architecture fool you though! In the image below, Point A has no voltage on its own. The phase voltage is still from Point A to Neutral (AN). In the case of the wye, the line voltage is between points A and B (AB). Voltage, by definition, is the potential difference in charge between two points. In your image, Point R, by itself, does not have a voltage because it is only one point. Point R with respect to Y (RY = two points) does. Point R with respect to B (RB = two points) does as well. Point R itself can be apart of more than one voltage simply because you require two points to determine a voltage. In a delta system, the two points required to measure a line voltage also happen to be the same two points connected across the phase. I think your confusion may come from being familiar with wye systems. Don't let the architecture fool you though! In the image below, Point A has no voltage on its own. The phase voltage is still from Point A to Neutral (AN). In the case of the wye, the line voltage is between points A and B (AB). 1 answered Mar 5 at 23:12 C. Lange 53311 silver badge1515 bronze badges Voltage, by definition, is the potential difference in charge between two points. In your image, Point R, by itself, does not have a voltage because it is only one point. Point R with respect to Y (RY = two points) does. Point R with respect to B (RB = two points) does as well. Point R itself can be apart of more than one voltage simply because you require two points to determine a voltage. In a delta system, the two points required to measure a line voltage also happen to be the same two points connected across the phase. I think you confusion may come from being familiar with wye systems. Don't let the architecture fool you though! In the image below, Point A has no voltage on its own. The phase voltage is still from Point A to Neutral (AN). In the case of the wye, the line voltage is between points A and B (AB). 