Hi StackExchange community,
Here I have a wiring diagram that represents a portion of a circuit found in a hospital.
The voltage difference was measured between phase A on the left and the phase A on the right and the voltage difference was found to be 120 V. The voltage difference between phase A on the left and phase A on the right should be 0 V.
Can anyone suggest possible reasons for this malfunction? A theory of mine was that the connections between phases may have been flipped somewhere along the way but I would appreciate some input.