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Thread: Production Meter Neutral

  1. #1
    Join Date
    Sep 2004
    Location
    Midwest
    Posts
    154

    Production Meter Neutral

    Our typical solar installation involves using a submeter base in series with the inverter to measure solar energy production. Whether or not the utility requires one, we usually put this in so that there is a record of the energy produced. sometime the utility provides it, and it is always a standard meter base like you'd find at the service entrance.

    Meter sockets are made to have the neutral and ground bonded to the case right in the middle of the meter base. Of course there is only one place int he system that is really allowed to have such a bond.


    What should be done with the neutral wire in this submeter? Should the ground wire connect to the center terminal, and the neutral continue through the socket insulated and unconnected?
    Lawrence Lile, P.E.

  2. #2
    Join Date
    May 2011
    Posts
    1,231
    Quote Originally Posted by lile001 View Post
    ...What should be done with the neutral wire in this submeter? Should the ground wire connect to the center terminal, and the neutral continue through the socket insulated and unconnected?
    Yes. Or, if there is a separate ground terminal, connect the ground wire there. You can also purchase meter sockets with an isolated neutral terminal, or with no center terminal.

  3. #3
    Join Date
    Dec 2012
    Location
    Placerville, CA, USA
    Posts
    9,010
    Quote Originally Posted by lile001 View Post
    Our typical solar installation involves using a submeter base in series with the inverter to measure solar energy production. Whether or not the utility requires one, we usually put this in so that there is a record of the energy produced. sometime the utility provides it, and it is always a standard meter base like you'd find at the service entrance.

    Meter sockets are made to have the neutral and ground bonded to the case right in the middle of the meter base. Of course there is only one place int he system that is really allowed to have such a bond.


    What should be done with the neutral wire in this submeter? Should the ground wire connect to the center terminal, and the neutral continue through the socket insulated and unconnected?
    If the meter operating current (whatever the magnitude) gets returned through the EGC rather than the neutral, it will be incompatible with having a GFCI upstream of the PV.

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