Duke Energy Carolinas Inverter Based Generation Interconnection Options for Non-Residential Service Customers
Table of Contents Rider NM and Rider SCG: Net Metering Single Phase PV System Typical 120/240V Single Phase Self-Contained Non-Residential Service.. 4 Rider NM and Rider SCG: Net Metering Single Phase PV System Typical 120/240V Single Phase Transformer Rated Non-Residential Service...5 PP-N and PP-H _ Buy all/sell all Metering: Self-Contained PV Meter Typical 120/240V Single Phase Self-Contained Non- Residential Service New and Existing Construction Using Gang Box Meter Enclosure...6 PP-N and PP-H _ Buy all/sell all Metering: Self-Contained PV Meter Typical 120/240V Single Phase Self-Contained Non-Residential Service Existing Construction Using Wiring Trough..7 PP-N and PP-H _ Buy all/sell all Metering: Self-Contained PV Meter Typical 120/240V Single Phase Transformer Rated Non-Residential Service Existing Construction Using... 8 Rider NM and Rider SCG: Net Metering Single and Three Phase PV System Transformer Rated (CT s on Transformer) Non-Residential Service 9 PP-N and PP-H _ Buy all/sell all Metering: Self-Contained PV Meter Transformer Rated 3 Phase Overhead Non-Residential Service.10 PP-N and PP-H _ Buy all/sell all Metering: Self-Contained PV Meter Transformer Rated (CT s on Transformer) Non-Residential Service (For 208Y/120V 3-Phase or 120/240V Single Phase) 11 Duke Energy Carolinas 2
Table of Contents (Continued) PP-N and PP-H _ Buy all/sell all Metering: CT Rated PV Meter Transformer Rated (CT s on Transformer) Non-Residential Service (For 3-Phase 460Y/265V and above).12 PP-N and PP-H _ Buy all/sell all Metering: CT Rated PV Meter Transformer Rated (CT s on ) Non-Residential Service Connecting in wiring trough (For 3-Phase 460Y/265V and above).13 PP-N and PP-H _ Buy all/sell all Metering: CT Rated PV Meter Transformer Rated (CT s on ) Non-Residential Service Connecting in transformer (For 3-Phase 460Y/265V and above).14 Appendix: Acronyms and Definitions...15 Duke Energy Carolinas 3
Net Metering Single Phase PV System Rider NM and Rider SCG Typical 120/240V Single Phase Self-Contained Non-Residential Service Existing DEC Service Meter needs to be changed to a DEC supplied bi-directional meter Customer (see note 4) See note 5 DEC owned Riser/Service to from Figure 1 1. Customer buys supplemental/standby needs on non-residential service rate. 2. SCG application: Excess electricity that is delivered to the grid is bought by DEC. 3. NM application: Excess electricity that is delivered to the grid is netted against monthly usage. 4. Customer owned PV disconnect switch is required to serve as a clear visible indication of switch position, lockable in the open position with a DEC standard padlock and be located adjacent to the existing service meter or delivery point. 5. All inverters must be UL1741 certified; single phase inverters shall be manufactured after November 7, 2000. Duke Energy Carolinas 4
Net Metering Single Phase PV System Rider NM and Rider SCG Typical 120/240V Single Phase Transformer Rated Non-Residential Service DEC Owned Metering CT Cabinet Customer (see note 4) See note 5 Existing DEC Service Meter needs to be changed to a DEC supplied bi-directional meter DEC Owned Riser/Service to from Figure 2 1. Customer buys supplemental/standby needs on non-residential service rate. 2. SCG application: Excess electricity that is delivered to the grid is bought by DEC. 3. NM application: Excess electricity that is delivered to the grid is netted against monthly usage. 4. Customer owned PV disconnect switch is required to serve as a clear visible indication of switch position, lockable in the open position with a DEC standard padlock and be located adjacent to the existing service meter or delivery point. 5. All inverters must be UL1741 certified; single phase inverters shall be manufactured after November 7, 2000. Duke Energy Carolinas 5
Purchase Power Rate Schedule, Self-Contained PV Meter Typical 120/240V Single Phase Self-Contained Non-Residential Service New and Existing Construction Using Gang Box Meter Enclosure (Suggested Purchased Power Installation) Self-Contained Service Meter New PP PV Meter See note 6 1 2 DEC Owned Riser/Service to from Customer Figure 3 1. Customer buys entire needs on non-residential service rate (Meter 1: Customer Service Meter). 2. Customer sells entire generation output to DEC (Meter 2: Customer Generation Meter). position, lockable in the open position with a DEC standard padlock and be located adjacent to the existing service meter or delivery point. The National Electric Code may require a fused disconnect switch or other main disconnect for this separate purchased power delivery. 4. Line side of PP generation meter (Meter 2) to be connected to DEC service common point in gang box meter enclosure. 5. PV conductors to be connected on load side of PP generation meter (Meter 2). 6. All inverters must be UL1741 certified; single phase inverters shall be manufactured after November 7, 2000. Duke Energy Carolinas 6
Purchase Power Rate Schedule, Self-Contained PV Meter Typical 120/240V Single Phase Self-Contained Non-Residential Service Existing Construction Using Wiring Trough Customer Existing Self-Contained Service Meter New PP PV Meter See note 6 1 2 Wiring Trough (see note 7) to from DEC Owned Riser/Service Figure 4 1. Customer buys entire needs on non-residential service rate (Meter 1: Customer Service Meter). 2. Customer sells entire generation output to Duke (Meter 2: Customer Generation Meter). position, lockable in the open position with a DEC standard padlock and be located adjacent to the existing service meter or delivery point. The National Electric Code may require a fused disconnect switch or other main disconnect for this separate purchased power delivery. 4. Line side of PP generation meter (Meter 2) to be connected to DEC service common point in wiring trough. 5. PV conductors to be connected on load side of PP generation meter (Meter 2). 6. All inverters must be UL1741 certified; single phase inverters shall be manufactured after November 7, 2000. 7. Trough specifications: 14in X 14in X 6in minimum size with a ground lug. The trough needs to be secured with respect to the general public safety. Duke Energy Carolinas 7
Purchase Power Rate Schedule, Self-Contained PV Meter Typical 120/240V Single Phase Transformer Rated Non-Residential Service Existing Construction Using Existing Service Meter 1 Customer New PP PV Meter See note 6 Metering Cabinet 2 To line side of current transformers (See note 4) DEC Owned Riser/Service Figure 5 to from 1. Customer buys entire needs on non-residential service rate (Meter 1: Customer Service Meter). 2. Customer sells entire generation output to DEC (Meter 2: Customer Generation Meter). position, lockable in the open position with a DEC standard padlock and be located adjacent to the existing service meter or delivery point. The National Electric Code may require a fused disconnect switch or other main disconnect for this separate purchased power delivery. 4. Line side of PP generation meter (Meter 2) to be connected to line side of current transformers in metering cabinet. 5. PV conductors to be connected on load side of PP generation meter (Meter 2). 6. All inverters must be UL1741 certified; single phase inverters shall be manufactured after November 7, 2000. Duke Energy Carolinas 8
Net Metering Single and Three Phase PV System Rider NM and Rider SCG Transformer Rated (CT s on Transformer) Non-Residential Service Existing Service Meter Existing Delivery Transformer (see note 4) See note 5 Figure 6 to from 1. Customer buys supplemental/standby needs on non-residential service rate. 2. SCG application: Excess electricity that is delivered to the grid is bought by DEC. 3. NM application: Excess electricity that is delivered to the grid is netted against monthly usage. 4. Customer owned PV disconnect switch is required to serve as a clear visible indication of switch position, lockable in the open position with a DEC standard padlock and be located adjacent to the existing service meter or delivery point. 5. All inverters must be UL1741 certified; single phase inverters shall be manufactured after November 7, 2000 and three phase inverters shall be manufactured after May 7, 2007. Duke Energy Carolinas 9
Purchase Power Rate Schedule, Self-Contained PV Meter Transformer/CT Rated 3 Phase Overhead Non-Residential Service (note: existing meter on building with CT s at overhead service entrance) Existing 3 Phase CT s Overhead Service See Note 4 To Existing Service Meter New PP PV Meter See note 6 1 2 Figure 7 See note 5 to from 1. Customer buys entire needs on non-residential service rate (Meter 1: Customer Service Meter). 2. Customer sells entire generation output to DEC (Meter 2: Customer Generation Meter). position, lockable in the open position with a DEC standard padlock and be located adjacent to the existing service meter or delivery point. The National Electric Code may require a fused disconnect switch or other main disconnect for this separate purchased power delivery. 4. Line side of PP generation meter (Meter 2) to be connected to line side of existing service CT s. 5. PV conductors to be connected on load side of PP generation meter (Meter 2). 6. All inverters must be UL1741 certified; single phase inverters shall be manufactured after November 7, 2000 and three phase inverters shall be manufactured after May 7, 2007. Duke Energy Carolinas 10
Purchase Power Rate Schedule, Self-Contained PV Meter (For 208Y/120V 3-Phase or 120/240V Single Phase) Transformer Rated (CT s on Transformer) Non-Residential Service Existing Delivery Transformer Duke Energy Carolinas Distribution Standards Existing Service Meter 1 New PP PV Self Contained Meter See note 7 2 To Transformer Secondary Spades to CT s for existing service from Transformer Secondary Compartment Figure 8 PV Conductors from PP Meter Existing Service Conductors 1. Customer buys entire needs on commercial service rate (Meter 1: Customer Service Meter). 2. Customer sells entire generation output to DEC (Meter 2: Customer Generation Meter) position, lockable in the open position with a DEC standard padlock and be located adjacent to the existing service meter or delivery point. The National Electric Code may require a fused disconnect switch or other main disconnect for this separate purchased power delivery. 4. Line side of PP generation meter (Meter 2) to be connected on line side of existing transformer CT s. 5. PV conductors to be connected on load side of PP generation meter (Meter 2). 6. PV conductors from load side of PP generation meter (Meter 2) to be pulled to transformer pad by the customer; DEC will make final connections in the transformer. 7. All inverters must be UL1741 certified; single phase inverters shall be manufactured after November 7, 2000 and three phase inverters shall be manufactured after May 7, 2007. Duke Energy Carolinas 11
Purchase Power Rate Schedule, CT Rated PV Meter (For 3-Phase 460Y/265V and above) Transformer Rated (CT s on Transformer) Non-Residential Service Existing Delivery Transformer Duke Energy Carolinas Distribution Standards Existing Service Meter Duke Owned 1 See note 6 2 New PP PV CT Rated Meter To Transformer Secondary Spades to CT s for existing service from Transformer Secondary Compartment Figure 9 PV Conductors from (note 4) Existing Service Conductors 1. Customer buys entire needs on non-residential service rate (Meter 1: Customer Service Meter). 2. Customer sells entire generation output to DEC (Meter 2: Customer Generation Meter). position, lockable in the open position with a DEC standard padlock and be located adjacent to the existing service meter or delivery point. The National Electric Code may require a fused disconnect switch or other main disconnect for this separate purchased power delivery. 4. PV conductors from to be connected on line side of existing transformer CT s. 5. PV conductors from to be pulled to transformer pad by the customer; DEC will make final connections in the transformer. 6. All inverters must be UL1741 certified; three phase inverters shall be manufactured after May 7, 2007. Duke Energy Carolinas 12
Purchase Power Rate Schedule, CT Rated PV Meter (For 3-Phase 460Y/265V and above) Transformer Rated (CT s on ) Non-Residential Service Existing Delivery Transformer Duke Owned See note 6 2 New PP PV CT Rated Meter Existing CT Rated Meter and to from To Existing 1 Wiring Trough Figure 10 1. Customer buys entire needs on non-residential service rate (Meter 1: Customer Service Meter). 2. Customer sells entire generation output to DEC (Meter 2: Customer Generation Meter). position, lockable in the open position with a DEC standard padlock and be located adjacent to the existing service meter or delivery point. The National Electric Code may require a fused disconnect switch or other main disconnect for this separate purchased power delivery. 4. PV conductors from to be connected to wiring trough. 5. Current and Potential Transformers need to be in wiring trough. 6. All inverters must be UL1741 certified; three phase inverters shall be manufactured after May 7, 2007. Duke Energy Carolinas 13
Purchase Power Rate Schedule, CT Rated PV Meter (For 3-Phase 460Y/265V and above) Transformer Rated (CT s on ) Non-Residential Service Existing Delivery Transformer Duke Owned See note 7 2 To Existing New PP PV CT Rated Meter 1 Existing CT Rated Meter and to To Transformer Secondary Spades from Figure 11 1. Customer buys entire needs on non-residential service rate (Meter 1: Customer Service Meter). 2. Customer sells entire generation output to DEC (Meter 2: Customer Generation Meter). position, lockable in the open position with a DEC standard padlock and be located adjacent to the existing service meter or delivery point. The National Electric Code may require a fused disconnect switch or other main disconnect for this separate purchased power delivery. 4. PV conductors from to be connected to transformer secondary spades. 5. PV conductors from to be pulled to transformer pad by the customer; DEC will make final connections in the transformer. 6. Need to verify if there is enough room in the transformer to make a standard secondary connection. 7. All inverters must be UL1741 certified; three phase inverters shall be manufactured after May 7, 2007. Duke Energy Carolinas 14
Appendix: Acronyms and Definitions CT: Current Transformers CT Rated Meter: Meter that requires external instrument transformers to measure electrical current. DEC: Duke Energy Carolinas IEEE 1547: Industry standard for interconnecting distributed energy resources with Electric Power Systems PP-H: Purchase Power Hydro PP-N: Purchase Power Non-Hydro PV: Photovoltaic Rider NM: Rider Net Metering Rider SCG: Rider Small Customer Generation Self-Contained Meter: Meter contains everything needed to measure electrical current UL: Underwriters Laboratories; an independent, not-for-profit product safety testing and certification organization UL 1741: test standard that confirms compliance with IEEE 1547. Standard for inverters, converters, controllers and interconnection system equipment for use with distributed energy resources. Duke Energy Carolinas 15 2013 Duke Energy Corporation 4/13-LU