I installed a temporary service for job we are working on. The service requested was a 200A 120/240v single phase service, we typically install a 4-jaw meter for this application. Utility came back and said that the 4 jaw would not work for the configuration on the temp service since they would be providing 120/208v single phase service and we would have to install the a 5-jaw meter. attached is the diagram they sent me, my question is what exactly is the 5th jaw doing since it is tied directly to the neutral? Is something in the meter that is needed? Just trying to understand the metering difference from 120/240v single phase to 120/208v single phase, same amount of wires voltage still under 250v, just a little confused on this one.
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