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PM5563: Meter Question on System Type
Recently, at a MSFT Datacenter project, we have been met with the issue of determining the correct meter system type for the connection provided by the LV Switchgear vendor. It is physically wired up as a 3Ph3W open delta 2PT/3CT connection, but the meter itself does not have an option for a 3P3W Open Delta. There are a total of 5 options available for a 3Ph3W connection:
3Ph3W Delta Ungrounded
3Ph3W Delta Corner Grounded
3Ph3W Wye Ungrounded
3Ph3W Wye Gnd
3Ph3W Res Gnd
For background, I've included 3 files. One of the equipment meter drawings, one of the PM5563 Installation guide, and one of the record drawings for the site. The record drawings show that the Primary MV XFMR secondary is tapped as a Wye with HRG. The wiring in the equipment drawings almost match one of the example wiring configurations for the meter in the installation guide, with the exception of the meter pulling a neutral off V2 in the equipment drawings.
My question to the team is: What is the best practice meter system type for the PM5563 that is shown in the equipment drawings attached? The customer would like to know the thought process and system type that the team had when putting together the installation guide and the example wiring shown that reflects that of the wiring on site. Thank you, and I appreciate any advice on the matter.