# Voltage at service

by rozilla
Tags: service, voltage
 P: 2 Hi guys, If there was a voltage drop of 20V on a 3ph line of 347/600, is the voltage at the service 327V or 580V, or both? Thanks you for reading. RozilΩ
 PF Gold P: 6,078 Is this a homework problem? What do YOU think the answer is, and why?
 Sci Advisor Thanks P: 1,715 Who observed a voltage drop of 20V ? How did they measure it ?
 P: 2 Voltage at service Hi guys, This isn't school related. That isn't the actual voltage - I'm trying to understand the concept of which would be the operating. With the concept, I can apply it accordingly. I assume it is 580 as it is three phase.
 Sci Advisor Thanks P: 1,715 The specified voltage is 347V / 600V. The three phases are separated by 120°. 1 / Tan(30°) = √3 = 1.73205 If you multiply 347V by √3 you get 600V. You cannot change one without changing the other. When combined with a common neutral you have three single phase supplies of 347V, relative to the neutral. The voltage between the phases is 600V. A 20V single phase drop is a 34.6V three phase drop. A 20V three phase drop is an 11.5V single phase drop.

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