The customer s solar generation metering shall have the same characteristics (voltage and phasing) as the Company s electric delivery service.

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1 Solar Purchase Program Electrical Guide Please share this document with your electrician to ensure wiring is done correctly. Should you or your electrician have any questions, please let us know. Included In This Guide: General Requirements Metering Configurations Images of the Installed Meter Display General Requirements: Installations must meet all requirements of the Dominion Virginia Power Information and Requirements for Electric Service ( Blue Book ). In cases where conflicting requirements exist between this document and the Dominion Virginia Power Information and Requirements for Electric Service ( Blue Book ) this document shall take precedence. The customer s solar generation metering shall have the same characteristics (voltage and phasing) as the Company s electric delivery service. The solar generation metering and disconnect (where required by local ordinance or code) should be installed on the same exterior wall and within view of the existing electric delivery service meter. For the sub-meter configuration only, an Equipment Grounding Conductor may be installed through and/or connected to the generation meter base where required by local ordinance or code. The Equipment Grounding Conductor must be routed and/or secured in such a manner that it cannot come into contact with load or line terminals in the meter base. A Grounding Electrode Conductor is not to be installed in any meter base. A decal will be applied to the cover of the electric delivery meter base indicating that solar generation is interconnected at the premise. A decal will also be applied to the cover of the solar generation metering. An additional decal may also be placed inside the meter base for both meter types. All decals will be provided and applied by Dominion. Decal for Generator Meter Base Decal for Electric Delivery Generator Meter Base

2 metering configurations The Company s Solar Purchase Program requires metering capable of providing three sets of metering data in order to be able to determine both a customer s total electrical usage, and the total solar generation. A Load Profile (LP) meter at the existing electric delivery service point and installation of an additional meter base and LP meter to measure the total output of the solar generation system is required for all participants. Generated solar energy, and energy that is returned to the grid, will be captured on metering received channels, and all energy delivered to the customer will be captured on the metering delivered channels. Consequently, the solar generator should in all cases be connected to the load side terminals of the meter enclosure. The two potential metering configurations are sub-meter and second meter. Preferred Metering Configuration: Sub-Meter Illustrated In: Figure 1 and 4 Figure 1 Sub- Meter Configuration Dominion Solar Generation Meter Customer s Electric Distribution Panel Customer s Solar Disconnect (where required) Branch Circuits to other Loads Customer s Inverter Dominion Electric Delivery Meter Dominion Electric Delivery Service Customer s Solar Panels A = Energy supplied by Dominion B = Energy supplied by Customer C = Energy returned to grid A + B - C = Energy consumed on site B = Customer Generated Energy

3 sub-meter Configuration Continued 200A 120/240V 1P Meter Base Stock Number Provided By Dominion - Installed and Wired by Customer on the same exterior wall and within view of the existing electric service meter Solar Disconnect (where required by local ordinance or codes) From Solar Generator - Minimum conductor size #8 AWG To Customer Distribution Panel Figure 1 Wiring Connections Sub-Meter 200A or Less Single Phase 120/240v

4 metering configurations Second Meter Illustrated In: Figures 2, 5 and 6 Customer s Solar Disconnect (where required) Customer s Electric Distribution Panel Customer s Electric Distribution Panel Branch Circuits to other Loads Customer s Inverter Dominion Solar Generation Meter Dominion Electric Delivery Meter Dominion Electric Delivery Service Customer s Solar Panels A = Energy supplied by Dominion B = Energy supplied by Customer C = Energy Diverted (not allowed) Figure 2 Second Meter Grid Connected Configuration

5 Second Meter Configuration Continued Solar Disconnect (where required by local ordinance or codes) 200A 120/240V 1P - 2 Position Meter Base Stock Number Provided By Dominion Installed and Wired by Customer From Solar Generator - Minimum Conductor Size #8 AWG To Customer Distribution Panel Figure 5 Wiring Connections Second Meter Grid Connected 200A or Less Single Phase 120/240V

6 Second Meter Configuration Continued 200A 120/240V 1P Meter Base Stock Number Provided By Dominion Installed by Customer 1.25 Conduit installed by Customer. Conductor provided and installed by Dominion From Solar Generator or Solar Disconnect (Where Required) - Minimum Conductor Size #8 AWG Figure 6 Wiring Connections Second Meter Grid Connected 200A or Less Single Phase 120/240V

7 INSTALLED METER DISPLAY Sub-Meter Arrangement Delivery Meter Displays 04 Prompt - Energy delivered to customer Total cumulative kwh delivered 35 Prompt - Energy sent back to grid Total cumulative kwh to grid Current direction of energy flow - left arrow indicates flow back to grid Generation Sub-Meter Display 01 Prompt - Energy generated Total cumulative kwh generated

8 Second Meter (second line side) arrangement Generation Meter Display 35 Prompt - Solar energy sent to grid 04 Prompt - Energy used by inverters Total cumulative kwh sent Total cumulative kwh to inverters Current direction of energy flow - left arrow indicates flow from solar to grid Delivery Meter Display 01 Prompt - Energy delivered to customer Total cumulative kwh delivered Current direction of energy flow - right arrow indicates flow from grid to customer