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Home My WebLink AboutMINUTES - 07072015 - C.30RECOMMENDATION(S): ADOPT Ordinance No. 2015-13, establishing an expedited, streamlined permitting process for small residential solar energy systems. APPROVE, as the County's standard checklist and plan forms for small residential rooftop energy systems, forms that substantially comply with those contained in the California Solar Permitting Guidebook published by the Governor's Office of Planning and Research, and as may be revised in future editions of the Guidebook (see attached forms). FISCAL IMPACT: None. BACKGROUND: State law requires that all cities and counties in California adopt an ordinance no later than September 30, 2015, describing the city or county's streamlined process for permitting small residential rooftop solar energy systems. The attached ordinance satisfies this requirement. Residential rooftop solar systems are the single largest category of building permits issued by the County Department of Conservation and Development (DCD). The number of such building permits issued by DCD has increased by over 300% the last few years, and DCD expects to issue building permits for well over 1,000 residential rooftop APPROVE OTHER RECOMMENDATION OF CNTY ADMINISTRATOR RECOMMENDATION OF BOARD COMMITTEE Action of Board On: 07/07/2015 APPROVED AS RECOMMENDED OTHER Clerks Notes: VOTE OF SUPERVISORS AYE:John Gioia, District I Supervisor Candace Andersen, District II Supervisor Mary N. Piepho, District III Supervisor Karen Mitchoff, District IV Supervisor ABSENT:Federal D. Glover, District V Supervisor Contact: Jason Crapo, (925) 674-7722 I hereby certify that this is a true and correct copy of an action taken and entered on the minutes of the Board of Supervisors on the date shown. ATTESTED: July 7, 2015 David Twa, County Administrator and Clerk of the Board of Supervisors By: June McHuen, Deputy cc: C. 30 To:Board of Supervisors From:John Kopchik, Director, Conservation & Development Department Date:July 7, 2015 Contra Costa County Subject:Permit Streamlining and Online Permitting for Residential Rooftop Solar Energy Systems BACKGROUND: (CONT'D) solar projects in 2015. As the volume of such projects has increased exponentially, DCD has trained additional staff on how to review and issue building permits for residential rooftop solar projects. DCD maintains prompt turn-around times for issuing such permits, and has developed excellent working relationships with the many solar contractors doing business within the County. Concurrent with the implementation of this ordinance, DCD is enhancing permitting services to contractors and property owners by extending "epermitting" to residential rooftop solar permits. Effective August 1, 2015, DCD will accept building permit applications for residential rooftop solar systems on the internet, through DCD's epermit center at Epermits.cccounty.us Permit applicants will be able to conduct the entire building permit transaction online, from permit application to payment of fees and permit issuance. DCD expects this will lead to a faster and more convenient permitting process for residential rooftop solar projects. On June 16, 2015 the Board approved an action to introduce Ordinance No. 2015-13. CONSEQUENCE OF NEGATIVE ACTION: Without Board approval, Contra Costa County would not be in compliance with State law requiring the Ordinance. ATTACHMENTS Ordinance 2015-13 PVR Eligibility Checklist Inspection Guide Central String Template Microinverter Template 1 v.05/2015 GENERAL REQUIREMENTS A. System size is 10 kW AC CEC rating or less Y N B. The solar array is flush roof‐mounted on one‐ or two‐family dwelling or accessory structure Y N C. The solar panel/module arrays will not exceed the maximum legal building height per cities or county ordinance Y N D. Solar system is utility interactive and without other power production sources Y N E. Permit application is completed and attached. Online Application Section B is required for online submittals. Y N F. Roof mounted plans are approved by the City Planning Department for Moraga, Orinda, Lafayette, Clayton, and Hercules Y N G. If submitting in the office, 3 sets of plans are included that are 11 x 17 minimum size. If submitting online, 1 multi‐page, 11 x 17 size and bookmarked PDF file for the plan set. Plans shall include roof plans showing module locations and existing framing information. Show inverter, batteries, and all equipment for the system and locations for the equipment. Allow 2 x 6 space for Comments and Stamps. Go to www.cccounty.us/solar for standards of online submittal. Y N H. Provide manufacturer’s installation and grounding instructions for modules I. Provide manufacturer’s specification sheet for all components but not limited to: Y N 1) Modules 2) Inverter 3) Microinverter 4) Power Optimizers 5) Any Alternate Power Sources such as generators, batteries, fuel cells, windmills or existing solar systems 6) Mounting/racking systems ELECTRICAL REQUIREMENTS A. No more than four photovoltaic module strings are connected to each Maximum PowerPoint Tracking (MPPT) input where source circuit fusing is included in the inverter Y N 1) No more than two strings per MPPT input where source circuit fusing is not included Y N 2) Fuses (if needed) are rated to the series fuse rating of the PV module Y N 3) No more than one noninverter‐integrated DC combiner is utilized per inverter Y N B. For central inverter systems: No more than two inverters are utilized Y N C. The PV system is interconnected to a single‐phase AC service panel of nominal 120/220 Vac with a bus bar rating of 200 A or less Y N D. The PV system is connected to the load side of the utility distribution equipment Y N STRUCTURAL REQUIREMENTS A. A completed Structural Criteria and supporting documentation is attached (if required) Y N B. Provide details for the racks and show the anchoring details for the attachments to the roof Y N CONTRA COSTA COUNTY Required Eligibility Checklist for Residential Solar Photovoltaic Permits for One‐ and Two‐Family Dwellings 2 v.05/2015 FIRE SAFETY REQUIREMENTS A. Fire classification of solar system is provided Y N B. All required markings and labels are provided Y N C. A diagram of the roof layout of all panels, modules, clear access pathways and approximate locations of electrical disconnecting means and roof access points is completed and attached. See attached sample of roof access points. Y N Notes: 1. These criteria are intended for expedited solar permitting process. 2. If any items are checked NO, revise design to fit within Eligibility Checklist, otherwise permit application will go through standard process. PLEASE READ AND INITIAL EACH ITEM BELOW: SIGNATURE PRINTED NAME I HAVE VERIFIED ALL INFORMATION IS CORRECT AND INCLUDED IN MY SUBMITTAL. IF I HAVE SUBMITTED DIGITAL FILES FOR PLAN REVIEW AND PERMIT ISSUANCE, I AGREE TO PROVIDE ONE COPY OF THE REVIEWED AND APPROVED PLANS IN COLOR, 11 X 17 SIZE FOR THE FIELD INSPECTOR. FAILURE TO PROVIDE THE PLANS IN THE FORMAT STATED ABOVE MAY RESULT IN A RE‐INSPECTION FEE. 3 v.05/2015 Electronic Plan Submittal or Plan Review will not be performed on this project if one or more items below are checked NO. Submittal in the office with 3 sets of paper plans will be required. 1. ROOF CHECKS A. Visual Review/Contractor’s Site Audit of Existing Conditions: 1) Is the roof a single roof without a reroof overlay? Y N 2) Does the roof structure appear structurally sound, without signs of alterations or significant structural deterioration or sagging, as illustrated in Figure 1? Y N B. Roof Structure Data: 1) Measured roof slope (e.g. 6:12): ________:12 2) Measured rafter spacing (center‐to‐center): _______ inch 3) Type of roof framing (rafter or manufactured truss): Rafter Truss 2. SOLAR ARRAY CHECKS A. Flush‐mounted Solar Array: 1) Is the plane of the modules (panels) parallel to the plane of the roof? Y N 2) Is there a minimum 2” and a maximum 10” gap between underside of module and the roof surface? Y N 3) Modules do not overhang any roof edges (ridges, hops, gable ends, eaves)? Y N B. Do the modules plus support components weigh no more than: 4 psf for photovoltaic arrays or 5 psf for solar thermal arrays? Y N C. Does the array cover no more than half of the total roof area (all roof planes)? Y N D. Are solar support component manufacturer’s project‐specific completed worksheets, tables with relevant cells circled, or web‐based calculator results attached? Y N E. Is a roof plan of the module and anchor layout attached? (see Figure 2) Y N F. Downward Load Check (Anchor Layout Check): 1) Proposed anchor horizontal spacing (see Figure 2): ____’ ‐ ____”ft‐in 2) Horizontal anchor spacing per Table 1: ____’ ‐ ____”ft‐in 3) Is proposed anchor horizontal spacing less than Table 1 spacing? Y N G. Wind Uplift Check (Anchor Fastener Check): 1) Anchor fastener data (see Figure 3): a. Diameter of lag screw, hanger bolt or self‐drilling screw: _______ inch b. Embedment depth of rafter: _______ inch c. Number of screws per anchor (typically one): _______ d. Are 5/16” diameter lag screws with 2.5” embedment into the rafter used, OR does the anchor fastener meet the manufacturer’s guidelines? Y N 3. SUMMARY A. All items above are checked YES. No additional calculations are required. B. One or more items are checked NO. Attach project‐specific drawings and calculations stamped and signed by a California‐licensed Civil or Structural Engineer. C. Electronic Plan Submittal or Plan Review will not be performed on this project if one or more items are checked NO. Job Address: ___________________________________________ Permit #: ________________________ Contractor/Installer: _____________________________________ License # & Class: _________________ Signature: ____________________________ Date: ____________ Phone #: ________________________ REQUIRED STRUCTURAL CRITERIA FOR RESIDENTIAL FLUSH‐MOUNTED ROOFTOP SOLAR ARRAYS CONTRA COSTA COUNTY ‐‐‐DRAFT 4 v.05/2015 Table 1. Maximum Horizontal Anchor Spacing Roof Slope Rafter Spacing 16” o.c.24” o.c.32” o.c. Photovoltaic Arrays (4 psf max) Flat to 6:12 0o to 26o 5'‐4"6'‐0"5'‐4" 7:12 to 12:12 27o to 45o 1'‐4"2'‐0"2'‐8" 13:12 to 24:12 46o to 63o 1'‐4"2'‐0"2'‐8" Solar support component manufacturer’s guidelines may be relied upon to ensure the array above the roof is properly designed, but manufacturer’s guidelines typically do NOT check to ensure that the roof itself can support the concentrated loads from the solar array. Table 1 assumes that the roof complied with the building code in effect at the time of construction, and places limits on anchor horizontal spacing to ensure that a roof structure is not overloaded under either downward loads or wind uplift loads. Note 4 below lists the basic assumptions upon which this table is based. Table 1 Notes: 1. Anchors are also known as “stand‐offs”, “feet”, “mounts” or “points of attachment”. Horizontal anchor spacing is also known as “cross‐slope” or “east‐west” anchor spacing (see Figure 2). 2. If anchors are staggered from row‐to‐row going up the roof, the anchor spacing may be twice that shown above, but no greater than 6’‐0”. 3. For manufactured plated wood trusses at slopes of flat to 6:12, the horizontal anchor spacing shall not exceed 4’‐0” and anchors in adjacent rows shall be staggered. 4. This table is based on the following assumptions:  The roof structure conformed to building code requirements at the time it was built.  The attached list of criteria are met.  Mean roof height is not greater than 40 feet.  Roof sheathing is at least 7/16” thick oriented strand board or plywood. 1x skip sheathing is acceptable.  If the dwelling is in Wind Exposure B (typical urban, suburban or wooded areas farther than 500 yards from large open fields), no more than one of the following conditions apply: ‐ The dwelling is located in a special wind region with design wind speed between 115 and 130 mph per ASCE 7‐10, or ‐ The dwelling is located on the top half of a tall hill, provided average slope steeper is less than 15%.  If the dwelling is In Wind Exposure C (within 500 yards of large open fields or grasslands), all of the  following conditions apply: ‐ Design wind speed is 110 mph or less (not in a Special Wind Region), and ‐ The dwelling is not located on the top half of a tall hill.  The solar array displaces roof live loads (temporary construction loads) that the roof was originally designed to carry.  The Structural Technical Appendix provides additional information about analysis assumptions. (http://www.opr.ca.gov/docs/Solar_Structural_Technical_Appendix.pdf) 5 v.05/2015 Figure 1. Roof Visual Structural Review (Contractor’s Site Audit) of Existing Conditions. The site auditor should verify the following: 1. No visually apparent disallowed rafter holes, notches and truss modifications as shown below. 2. No visually apparent structural decay or un‐repaired fire damage. 3. Roof sag, measured in inches, is not more than the rafter or ridge beam length in feet divided by 20. Rafters that fail the above criteria should not be used to support solar arrays unless they are first strengthened. 6 v.05/2015 Figure 2. Sample Solar Panel Array and Anchor Layout Diagram (Roof Plan). Figure 3. Typical Anchor with Lag Screw Attachment. 7 v.05/2015 ROOF ACCESS AND PATHWAYS Roof Access Points: Roof access points shall be located in areas that do not require the placement of ground ladders over openings such as windows and doors, and located at strong points of building construction in locations where the access point does not conflict with overhead obstructions such as tree limbs, wires or signs. v.05/2015 All California Electrical Code (CEC), California Residential Code (CRC), California Building Code (CBC) and California Fire Code (CFC) references are to the 2013 versions unless otherwise noted. Make sure all PV system AC/DC disconnects and circuit breakers are in the open position and verify the following. 1. All work done in a neat and workmanlike manner (CEC 110.12). 2. PV module model number, quantity and location according to the approved plan. 3. Array mounting system and structural connections according to the approved plan. 4. Roof penetrations flashed/sealed according to the approved plan. 5. Array exposed conductors are properly secured, supported and routed to prevent physical damage. 6. Conduit installation according to CRC R331.3 and CEC 690.4(F). 7. Firefighter access according to approved plan. 8. Roof‐mounted PV systems have the required fire classification (CBC 1505.9 or CRC R902.4). 9. Grounding/bonding of rack and modules according to the manufacturer’s installation instructions that are approved and listed. 10. Equipment installed, listed and labeled according to the approved plan (e.g., PV modules, DC/DC converters, combiners, inverters, disconnects, load centers and electrical service equipment). 11. For grid‐connected systems, inverter is marked “utility interactive.” 12. For ungrounded inverters, installation complies with CEC 690.35 requirements. 13. Conductors, cables and conduit types, sizes and markings according to the approved plan. 14. Overcurrent devices are the type and size according to the approved plan. 15. Disconnects according to the approved plan and properly located as required by the CEC. 16. Inverter output circuit breaker is located at opposite end of bus from utility supply at load center and/or service panelboard (not required if the sum of the inverter and utility supply circuit breakers is less than or equal to the panelboard bus rating). 17. PV system markings, labels and signs according to the approved plan. 18. Connection of the PV system to the grounding electrode system according to the approved plan. 19. Access and working space for operation and maintenance of PV equipment such as inverters, disconnecting means and panel boards (not required for PV modules) (CEC 110.26). Contra Costa County‐‐DRAFT Inspection Guide for PV Systems in One‐ and Two‐ Family Dwellings (For Rooftop Photovoltaic Systems) CONTRA COSTA COUNTY PV TOOLKIT DOCUMENT #3 PROVIDE THIS DOCUMENT TO FIELD INSPECTOR ALONG WITH ALL SYSTEM INSTALLATION INSTRUCTIONS. SCOPE: Use this plan ONLY for utility‐interactive central/string inverter systems not exceeding a system AC inverter output rating of 10kW on the roof of a one‐ or two‐family dwelling or accessory structure. The photovoltaic system must interconnect to the load side of a single‐phase AC service panel of nominal 120/240Vac with a bus bar rating of 225A or less. This plan is not intended for bipolar systems, hybrid systems or systems that utilize storage batteries, charge controllers, trackers, more than two inverters or more than one DC combiner (noninverter‐integrated) per inverter. Systems must be in compliance with current California Building Standards Codes and local amendments of the authority having jurisdiction (AHJ). Other Articles of the California Electrical Code (CEC) shall apply as specified in 690.3. MANUFACTURER’S SPECIFICATION SHEETS MUST BE PROVIDED for proposed inverter, modules, combiner/junction boxes and racking systems. Installation instructions for bonding and grounding equipment shall be provided, and local AHJs may require additional details. Listed and labeled equipment shall be installed and used in accordance with any instructions included in the listing or labeling (CEC 110.3). Equipment intended for use with PV system shall be identified and listed for the application (CEC 690.4[D]). Job Address: Permit #: __________________________________ Contractor/Engineer Name: License # and Class: _________________ Signature: Date: Phone Number: Total # of Inverters installed: (If more than one inverter, complete and attach the “Supplemental Calculation Sheets” and the “Load Center Calculations” if a new load center is to be used.) Inverter 1 AC Output Power Rating: Watts Inverter 2 AC Output Power Rating (if applicable): Watts Combined Inverter Output Power Rating: ≤ 10,000 Watts Location Ambient Temperatures (Check box next to which lowest expected temperature is used): 1) Lowest expected ambient temperature for the location (TL ) = Between ‐1° to ‐5° C Lowest expected ambient temperature for the location (TL ) = Between ‐6° to ‐10° C Average ambient high temperature (TH) = 47° C Note: For a lower TL or a higher TH, use the Comprehensive Standard Plan DC Information: Module Manufacturer: _________________________________ Model: _____________________ 2) Module Voc (from module nameplate): ____Volts 3) Module Isc (from module nameplate): ___Amps 4) Module DC output power under standard test conditions (STC) = ________ Watts (STC) Solar PV Standard Plan Simplified Central/String Inverter Systems for One‐ and Two‐Family Dwellings CONTRA COSTA COUNTY Table 1. Maximum Number of PV Modules in Series Based on Module Rated VOC for 600 Vdc Rated Equipment (CEC 690.7) Max. Rated Module VOC (*1.12) (Volts) 29.76 31.51 33.48 35.71 38.27 41.21 44.64 48.70 53.57 59.52 66.96 76.53 89.29 Max. Rated Module VOC (*1.14) (Volts) 29.24 30.96 32.89 35.09 37.59 40.49 43.86 47.85 52.63 58.48 65.79 75.19 87.72 Max # of Modules for 600 Vdc 18 17 16 15 14 13 12 11 10 9 8 7 6 Table 2. Largest Module VOC for Single‐Module DC/DC Converter Configurations (with 80 V AFCI Cap) (CEC 690.7 and 690.11) Max. Rated Module VOC (*1.12) (Volts) 30.4 33.0 35.7 38.4 41.1 43.8 46.4 49.1 51.8 54.5 57.1 59.8 62.5 65.2 67.9 70.5 Max. Rated Module VOC (*1.14) (Volts) 29.8 32.5 35.1 37.7 40.4 43.0 45.6 48.2 50.9 53.5 56.1 58.8 61.4 64.0 66.7 69.3 DC/DC Converter Max DC Input (Step #6) (Volts) 34 37 40 43 46 49 52 55 58 61 64 67 70 73 76 79 5) DC Module Layout Identify each source circuit (string) for inverter 1 shown on the roof plan with a Tag (e.g. A,B,C,…) Number of modules per source circuit for inverter 1 Identify, by tag, which source circuits on the roof are to be paralleled (if none, put N/A) Combiner 1: Combiner 2: Total number of source circuits for inverter 1: 6) Are DC/DC Converters used? Yes No If No, skip to Step 7. If Yes enter info below. DC/DC Converter Model #: Max DC Output Current: Amps Max # of DC/DC Converters in an Input Circuit: DC/DC Converter Max DC Input Voltage: Volts Max DC Output Current: Volts DC/DC Converter Max DC Input Power: Watts 7) Maximum System DC Voltage — Use A1 or A2 for systems without DC/DC converters, and B1 or B2 with DC/DC Converters. A1. Module VOC (STEP 2) = x # in series (STEP 5) x 1.12 (If ‐1 ≤ TL ≤ ‐5°C, STEP 1) = V A2. Module VOC (STEP 2) = x # in series (STEP 5) x 1.14 (If ‐6 ≤ TL ≤ ‐10°C, STEP 1) = V Use for DC/DC converters. The value calculated below must be less than DC/DC converter max DC input voltage (STEP 6). B1. Module VOC (STEP 2) = x # of modules per converter (STEP 6) x 1.12 (If ‐1 ≤ TL ≤ ‐5°C, STEP 1) = V B2. Module VOC (STEP 2) = x # of modules per converter (STEP 6) x 1.14 (If ‐6 ≤ TL ≤ ‐10°C, STEP 1) = V 8) Maximum System DC Voltage from DC/DC Converters to Inverter — Only required if Yes in Step 6 Maximum System DC Voltage = Volts 9) Maximum Source Circuit Current Is Module ISC below 9.6 Amps (Step 3)? Yes No (If No, use Comprehensive Standard Plan) 10) Sizing Source Circuit Conductors Source Circuit Conductor Size = Min. #10 AWG copper conductor, 90° C wet (USE‐2, PV Wire, XHHW‐2, THWN‐2, RHW‐2) For up to 8 conductors in roof‐mounted conduit exposed to sunlight at least ½” from the roof covering (CEC 310) Note: For over 8 conductors in the conduit or mounting height of lower than ½” from the roof, use Comprehensive Plan. 11) Are PV source circuits combined prior to the inverter? Yes No If No, use Single Line Diagram 1 and proceed to Step 13. If Yes, use Single Line Diagram 2 with Single Line Diagram 4 and proceed to Step 12. Is source circuit OCPD required? Yes No Source circuit OCPD size (if needed): 15 Amps 12) Sizing PV Output Circuit Conductors — If a combiner box will NOT be used (Step 11), Output Circuit Conductor Size = Min. #6 AWG copper conductor 13) Inverter DC Disconnect Does the inverter have an integrated DC disconnect? Yes No If Yes, proceed to step 14. If No, the external DC disconnect to be installed is rated for Amps (DC) and Volts (DC) 14) Inverter Information Manufacturer: Model: Max. Continuous AC Output Current Rating: Amps Integrated DC Arc‐Fault Circuit Protection? Yes No (If No is selected, Comprehensive Standard Plan) Grounded or Ungrounded System? Grounded Ungrounded AC Information: 15) Sizing Inverter Output Circuit Conductors and OCPD Inverter Output OCPD rating = Amps (Table 3) Inverter Output Circuit Conductor Size = AWG (Table 3) Table 3. Minimum Inverter Output OCPD and Circuit Conductor Size Inverter Continuous Output Current Rating (Amps) (Step 14)12 16 20 24 28 32 36 40 48 Minimum OCPD Size (Amps)15 20 25 30 35 40 45 50 60 Minimum Conductor Size (AWG, 75° C, Copper)14 12 10 10 8 8 6 6 6 16) Point of Connection to Utility Only load side connections are permitted with this plan. Otherwise, use Comprehensive Standard Plan. Is the PV OCPD positioned at the opposite end from input feeder location or main OCPD location? Yes No If Yes, circle the Max Combined PV System OCPD(s) at 120% value as determined from Step 15 (or Step S20), bus bar Rating, and Main OCPD as shown in Table 4. If No, circle the Max Combined PV System OCPD(s) at 100% value as determined from Step 15 (or Step S20), bus bar Rating, and Main OCPD as shown in Table 4. Per 705.12(D)(2): [Inverter output OCPD size [Step #15 or S20] + Main OCPD Size] ≤ [bus size x (100% or 120%)] Table 4. Maximum Combined Supply OCPDs Based on Bus Bar Rating (Amps) per CEC 705.12(D)(2) Bus Bar Rating 100 125 125 200 200 200 225 225 225 Main OCPD 100 100 125 150 175 200 175 200 225 Max Combined PV System OCPD(s) at 120% of Bus Bar Rating 20 50 25 60* 60* 40 60* 60* 45 Max Combined PV System OCPD(s) at 100% Bus Bar Rating 0 25 0 50 25 0 50 25 0 *This value has been lowered to 60 A from the calculated value to reflect 10 kW AC size maximum. Reduction of the main breaker is not permitted with this plan. Otherwise, use Comprehensive Standard Plan. 17 & 18 & 19) Labels and Grounding and Bonding This content is covered by the labels on the next page and the Single Line Diagram(s). For background information, refer to the Comprehensive Standard Plan. Solar PV Standard Plan – Simplified Central/String Inverter Systems for One‐ and Two‐Family Dwellings Markings CEC Articles 690 and 705 and CRC Section R331 require the following labels or markings be installed at these components of the photovoltaic system: WARNING ELECTRIC SHOCK HAZARD. THE DC CONDUCTORS OF THIS PHOTOVOLTAIC SYSTEM ARE UNGROUNDED AND MAY BE ENERGIZED WARNING INVERTER OUTPUT CONNECTION; DO NOT RELOCATE THIS OVERCURRENT DEVICE CRC R331.2 and CFC 605.11.1 [Marked on junction/combiner boxes and conduit every 10’] WARNING: PHOTOVOLTAIC POWER SOURCE J/Box PV SYSTEM AC DISCONNECT RATED AC OUTPUT CURRENT - ____AMPS AC NORMAL OPERATING VOLTAGE ___VOLTS M A C INVERTER D C WARNING DUAL POWER SOURCES SECOND SOURCE IS PHOTOVOLTAIC SYSTEM RATED AC OUTPUT CURRENT- ____AMPS AC NORMAL OPERATING VOLTAGE ___VOLTS WARNING ELECTRIC SHOCK HAZARD DO NOT TOUCH TERMINALS TERMINALS ON BOTH LINE AND LOAD SIDES MAY BE ENERGIZED IN THE OPEN POSITION PV SYSTEM DC DISCONNECT RATED MAX POWER-POINT CURRENT- ___ADC RATED MAX POWER-POINT VOLTAGE- ___VDC SHORT CIRCUIT CURRENT- ___ADC MAXIMUM SYSTEM VOLTAGE-___VDC CEC 705.12(D)(7) [Not required if panelboard is rated not less than sum of ampere ratings of all overcurrent devices supplying it] CEC 690.35(F) [Only required for ungrounded systems] CEC 690.54 CEC 690.53 CEC 690.17 CEC 690.54 & CEC 705.12(D)(4) WARNING ELECTRIC SHOCK HAZARD IF A GROUND FAULT IS INDICATED, NORMALLY GROUNDED CONDUCTORS MAY BE UNGROUNDED AND ENERGIZED CEC 690.5(C) [Normally already present on listed inverters] Code Abbreviations: California Electrical Code (CEC) California Residential Code (CRC) California Fire Code (CFC) Informational note: ANSI Z535.4 provides guidelines for the design of safety signs and labels for application to products. A phenolic plaque with contrasting colors between the text and background would meet the intent of the code for permanency. No type size is specified, but 20 point (3/8”) should be considered the minimum. CEC 705.12 requires a permanent plaque or directory denoting all electric power sources on or in the premises. Solar PV Standard Plan – Simplified Central/String Inverter System for One‐ and Two‐Family Dwellings TAG DESCRIPTION AND CONDUCTOR TYPECONDUCTOR SIZENUMBER OF CONDUCTORSCONDUIT/CABLE TYPECONDUIT SIZEAUSE‐2 □ OR PV‐WIRE □EGC/GEC:BEGC/GEC:CEGC/GEC:DEGC/GEC:CONDUCTOR/CONDUIT SCHEDULE Property Owner: Property Address: Contractor: Contractor Phone: Contractor License Number: Contractor Class: Solar PV Standard Plan – Simplified Central/String Inverter System for One‐ and Two‐Family Dwellings TAGDESCRIPTION AND CONDUCTOR TYPECONDUCTOR SIZENUMBER OF CONDUCTORSCONDUIT/CABLE TYPECONDUIT SIZEA1 USE‐2 □ OR PV‐WIRE □EGC/GEC:B1EGC/GEC:CEGC/GEC:DEGC/GEC:EEGC/GEC:COMBINER CONDUCTOR/CONDUIT SCHEDULE TAGDESCRIPTION AND CONDUCTOR TYPECONDUCTOR SIZENUMBER OF CONDUCTORSCONDUIT/CABLE TYPECONDUIT SIZEA2 USE‐2 □ OR PV‐WIRE □EGC/GEC:B2EGC/GEC:NON‐COMBINED STRINGS CONDUCTOR/CONDUIT SCHEDULE (IF APPLICABLE)Property Owner: Property Address: Contractor: Contractor Phone: Contractor License Number: Contractor Class: Supplemental Calculation Sheets for Inverter #2 (Only include if second inverter is used) DC Information: Module Manufacturer: Model: S2) Module Voc (from module nameplate): Volts S3) Module Isc (from module nameplate): Amps S4) Module DC output power under standard test conditions (STC) = Watts (STC) S5) DC Module Layout Identify each source circuit (string) for inverter 1 shown on the roof plan with a Tag (e.g. A,B,C,…) Number of modules per source circuit for inverter 1 Identify, by tag, which source circuits on the roof are to be paralleled (if none, put N/A) Combiner 1: Combiner 2: Total number of source circuits for inverter 1: S6) Are DC/DC Converters used? Yes No If No, skip to Step S7. If Yes, enter info below. DC/DC Converter Model #: Max DC Output Current: Amps Max # of DC/DC Converters in an Input Circuit: DC/DC Converter Max DC Input Voltage: Volts Max DC Output Current: Volts DC/DC Converter Max DC Input Power: Watts Table 1. Maximum Number of PV Modules in Series Based on Module Rated VOC for 600 Vdc Rated Equipment (CEC 690.7) Max. Rated Module VOC (*1.12) (Volts) 29.76 31.51 33.48 35.71 38.27 41.21 44.64 48.70 53.57 59.52 66.96 76.53 89.29 Max. Rated Module VOC (*1.14) (Volts) 29.24 30.96 32.89 35.09 37.59 40.49 43.86 47.85 52.63 58.48 65.79 75.19 87.72 Max # of Modules for 600 Vdc 18 17 16 15 14 13 12 11 10 9 8 7 6 Table 2. Largest Module VOC for Single‐Module DC/DC Converter Configurations (with 80 V AFCI Cap) (CEC 690.7 and 690.11) Max. Rated Module VOC (*1.12) (Volts) 30.4 33.0 35.7 38.4 41.1 43.8 46.4 49.1 51.8 54.5 57.1 59.8 62.5 65.2 67.9 70.5 Max. Rated Module VOC (*1.14) (Volts) 29.8 32.5 35.1 37.7 40.4 43.0 45.6 48.2 50.9 53.5 56.1 58.8 61.4 64.0 66.7 69.3 DC/DC Converter Max DC Input (Step 6) (Volts) 34 37 40 43 46 49 52 55 58 61 64 67 70 73 76 79 S7) Maximum System DC Voltage — Use A1 or A2 for systems without DC/DC converters, and B1 or B2 with DC/DC Converters. A1. Module VOC (STEP S2) = x # in series (STEP S5) x 1.12 (If ‐1 ≤ TL ≤ ‐5°C, STEP S1) = V A2. Module VOC (STEP S2) = x # in series (STEP S5) x 1.14 (If ‐6 ≤ TL ≤ ‐10°C, STEP S1) = V Use for DC/DC converters. The value calculated below must be less than DC/DC converter max DC input voltage (STEP S6). B1. Module VOC (STEP S2) = x # of modules per converter (STEP S6) x 1.12 (If ‐1 ≤ TL ≤ ‐5°C, STEP S1) = V B2. Module VOC (STEP S2) = x # of modules per converter (STEP S6) x 1.14 (If ‐6 ≤ TL ≤ ‐10°C, STEP S1) = V S8) Maximum System DC Voltage from DC/DC Converters to Inverter — Only required if Yes in Step S6 Maximum System DC Voltage = Volts S9) Maximum Source Circuit Current Is Module ISC below 9.6 Amps (Step S3)? Yes No (If No, use Comprehensive Standard Plan) S10) Sizing Source Circuit Conductors Source Circuit Conductor Size = Min. #10 AWG copper conductor, 90° C wet (USE‐2, PV Wire, XHHW‐2, THWN‐2, RHW‐2) For up to 8 conductors in roof‐mounted conduit exposed to sunlight at least ½” from the roof covering (CEC 310) Note: For over 8 conductors in the conduit or mounting height of lower than ½” from the roof, use Comprehensive Plan. S11) Are PV source circuits combined prior to the inverter? Yes No If No, use Single Line Diagram 1 and proceed to Step S13. If Yes, use Single Line Diagram 2 with Single Line Diagram 4 and proceed to Step S12. Is source circuit OCPD required? Yes No Source circuit OCPD size (if needed): 15 Amps S12) Sizing PV Output Circuit Conductors — If a combiner box will NOT be used (Step S11), Output Circuit Conductor Size = Min. #6 AWG copper conductor S13) Inverter DC Disconnect Does the inverter have an integrated DC disconnect? Yes No If Yes, proceed to Step S14. If No, the external DC disconnect to be installed is rated for Amps (DC) and Volts (DC) S14) Inverter Information Manufacturer: Max. Continuous AC Output Current Rating: Amps Model: Integrated DC Arc‐Fault Circuit Protection? Yes No (If No is selected, Comprehensive Standard Plan) Grounded or Ungrounded System? Grounded Ungrounded AC Information: S15) Sizing Inverter Output Circuit Conductors and OCPD Inverter Output OCPD rating = Amps (Table 3) Inverter Output Circuit Conductor Size = AWG (Table 3) Table 3. Minimum Inverter Output OCPD and Circuit Conductor Size Inverter Continuous Output Current Rating (Amps) (Step 14)12 16 20 24 28 32 36 40 48 Minimum OCPD Size (Amps)15 20 25 30 35 40 45 50 60 Minimum Conductor Size (AWG, 75° C, Copper)14 12 10 10 8 8 6 6 6 Load Center Calculations (Omit if a load center will not be installed for PV OCPDs) S20) Load Center Output: Calculate the sum of the maximum AC outputs from each inverter. Inverter #1 Max Continuous AC Output Current Rating [STEP S14] × 1.25 = Amps Inverter #2 Max Continuous AC Output Current Rating [STEP S14] × 1.25 = Amps Total inverter currents connected to load center (sum of above) = Amps Conductor Size: AWG Overcurrent Protection Device: Amps Load center bus bar rating: Amps The sum of the ampere ratings of overcurrent devices in circuits supplying power to a bus bar or conductor shall not exceed 120 percent of the rating of the bus bar or conductor. Solar PV Standard Plan – Simplified Central/String Inverter System for One‐ and Two‐Family Dwellings TAG DESCRIPTION AND CONDUCTOR TYPECONDUCTOR SIZENUMBER OF CONDUCTORSCONDUIT/CABLE TYPECONDUIT SIZEAUSE‐2 □ OR PV‐WIRE □EGC/GEC:BEGC/GEC:CEGC/GEC:CONDUCTOR/CONDUIT SCHEDULEDC/DC CONVERTERSDC/DC CONVERTERSProperty Owner: Property Address: Contractor: Contractor Phone: Contractor License Number: Contractor Class: Solar PV Standard Plan – Simplified Central/String Inverter System for One‐ and Two‐Family Dwellings TAGDESCRIPTION AND CONDUCTOR TYPECONDUCTOR SIZENUMBER OF CONDUCTORSCONDUIT/CABLE TYPECONDUIT SIZEA1 USE‐2 □ OR PV‐WIRE □EGC/GEC:B1EGC/GEC:CEGC/GEC:DEGC/GEC:COMBINER CONDUCTOR/CONDUIT SCHEDULE TAGDESCRIPTION AND CONDUCTOR TYPECONDUCTOR SIZENUMBER OF CONDUCTORSCONDUIT/CABLE TYPECONDUIT SIZEA2 USE‐2 □ OR PV‐WIRE □EGC/GEC:B2EGC/GEC:NON‐COMBINED STRINGS CONDUCTOR/CONDUIT SCHEDULE (IF APPLICABLE)Property Owner: Property Address: Contractor: Contractor Phone: Contractor License Number: Contractor Class: SOLAR PV STANDARD PLAN ‐ SIMPLIFIED Central/String Inverter Systems for One- and Two-Family Dwellings ROOF LAYOUT PLAN Items required to be shown:Building footprint and property lines, all panels, modules, clear access pathways, location of main service, approximate locations of electrical disconnecting means, roof access points and locations of any other structures on the property Property Owner: Property Address: Contractor: Contractor Phone: Contractor License Number: Contractor Class: SOLAR PV STANDARD PLAN ‐ SIMPLIFIED Central/String Inverter Systems for One- and Two-Family Dwellings STRUCTURAL VIEWS Items requiredto be shown: 1. Existing roof types, slopes, roofing material and number of layers 2. Size, spacing, span and direction for existing rafters, ceiling joists and framing support members 3. Show location of load bearing walls on framing cross section 4. Details showing that solar PV panels are flush mounted 10” or less 5. Attachment details showing type, diameter and length of embedment of bolts and spacing; number of bolts per solar PV panelProperty Owner: Property Address: Contractor: Contractor Phone: Contractor License Number: Contractor Class: PROVIDE THIS DOCUMENT TO FIELD INSPECTOR ALONG WITH ALL SYSTEM INSTALLATION INSTRUCTIONS. SCOPE: Use this plan ONLY for systems using utility‐interactive Microinverters or AC Modules (ACM) not exceeding a combined system AC inverter output rating of 10 kW, with a maximum of 3 branch circuits, one PV module per inverter and with PV module ISC maximum of 10‐A DC, installed on a roof of a one‐ or two‐family dwelling or accessory structure. The photovoltaic system must interconnect to a single‐phase AC service panel of 120/240 Vac with service panel bus bar rating of 400 A or less. This plan is not intended for bipolar systems, hybrid systems or systems that utilize storage batteries, charge controllers or trackers. Systems must be in compliance with current California Building Standards Codes and local amendments of the authority having jurisdiction (AHJ). Other articles of the California Electrical Code (CEC) shall apply as specified in section 690.3. MANUFACTURER’S SPECIFICATION SHEETS MUST BE PROVIDED for proposed inverters, modules, combiner/junction boxes and racking systems. Installation instructions for bonding and grounding equipment shall be provided and local AHJs may require additional details. Listed and labeled equipment shall be installed and used in accordance with any instructions included in the listing or labeling (CEC110.3). Equipment intended for use with PV system shall be identified and listed for the application CEC 690.4(D). Applicant and Site Information Job Address: ______________________________________________ Permit #: __________________________ Contractor /Engineer Name: _________________________________ License # and Class: _________________ Signature: _______________________________ Date: ___________ Phone Number: ____________________ 1. General Requirements and System Information Microinverter AC Module (ACM) Number of PV modules installed: __________ Number of ACMs installed: __________ Number of Microinverters installed: __________ Note: Listed Alternating-Current Module (ACM) is defined in CEC 690.2 and installed per CEC 690.6 1.1 Number of Branch Circuits, 1, 2 or 3: __________ 1.2 Actual number of Microinverters or ACMs per branch circuit: 1 _________ 2._________ 3.________ 1.3 Total AC system power rating = (Total Number of Microinverters or ACMs) * (AC inverter power output) = __________ Watts 1.4 Lowest expected ambient temperature for this plan in Table 1: For ‐1 to ‐5°C use 1.12 or for ‐6 to ‐10°C use 1.14 correction factors. 1.5 Average ambient high temperature for this plan: = +47°C Note: For lower expected ambient or higher average ambient high temperatures, use Comprehensive Standard Plan. 2. Microinverter or ACM Information and Ratings Microinverters with ungrounded DC inputs shall be installed in accordance with CEC 690.35. Microinverter or ACM Manufacturer: _____________________________ Model: ______________________________________________________ 2.1 Rated (continuous) AC output power: __________ Watts TOOKIT DOCUMENT #4 Solar PV Standard Plan Simplified Microinverter and AC Module Systems for One‐ and Two‐Family Dwellings CONTRA COSTA COUNTY 2.2 Nominal AC voltage rating: __________ Volts 2.3 Rated (continuous) AC output current: __________ Amps If installing ACMs, skip [STEPS 2.4] 2.4 Maximum DC input voltage rating: __________ Volts (limited to 79 V, otherwise use the Comprehensive Standard Plan) 2.5 Maximum AC output overcurrent protection device (OCPD) ___________ Amps 2.6 Maximum number of Microinverters or ACMs per branch circuit: ___________ 3. PV Module Information (If installing ACMs, skip to [STEP 4]) PV Module Manufacturer: _______________________________________________ Model: _______________________________________________________________ Module DC output power under standard test conditions (STC) = __________ Watts 3.1 Module VOC at STC (from module nameplate): __________ Volts 3.2 Module ISC at STC (from module nameplate): ___________ Amps 3.3 Adjusted PV Module DC voltage at minimum temperature = [Table 1] ___________ [cannot exceed Step 2.4] Table 1. Module VOC at STC Based on Inverter Maximum DC Input Voltage Derived from CEC 690.7 Microinverter Max. DC Input [STEP 2.4] (Volts) 34 37 40 43 46 49 52 55 58 61 64 67 70 73 76 79 Max. Module VOC @ STC, 1.12 (‐1 to ‐5°C) Correction Factor (Volts) 30.4 33.0 35.7 38.4 41.1 43.8 46.4 49.1 51.8 54.5 57.1 59.8 62.5 65.2 67.9 70.5 Max. Module VOC @ STC, 1.14 (‐6 to ‐10°C) Correction Factor (Volts) 29.8 32.5 35.1 37.7 40.4 43.0 45.6 48.2 50.9 53.5 56.1 58.8 61.4 64.0 66.7 69.3 4. Branch Circuit Output Information Fill in [Table 3] to describe the branch circuit inverter output conductor and OCPD size. Use [Table 2] for determining the OCPD and Minimum Conductor size. Table 2. Branch Circuit OCPD and Minimum Conductor Size* Circuit Current (Amps) Circuit Power (Watts) OCPD (Amps) Minimum Conductor Size (AWG) Minimum Metal Conduit Size for 6 Current Carrying Conductors 12 2880 15 12 ¾” 16 3840 20 10 ¾” 20 4800 25 8 1” 24 5760 30 8 1” *CEC 690.8 and 210.19 (A)(1) Factored in Table 2, Conductors are copper, insulation must be 90°C wet‐rated. Table 2 values are based on maximum ambient temperature of 69°C, which includes 22°C adder, exposed to direct sunlight, mounted > 0.5 inches above rooftop, ≤ 6 current carrying conductors (3 circuits) in a circular raceway. Otherwise use Comprehensive Standard Plan. Table 3. PV Array Configuration Summary Branch 1 Branch 2 Branch 3 Number of Microinverters or ACMs [STEP 1] Selected Conductor Size [Error! Reference source not found.] (AWG) Selected Branch and Inverter Output OCPD [Error! Reference source not found.] 5. Solar Load Center (if used) 5.1 Solar Load Center is to have a bus bar rating not less than 100 Amps. Otherwise use Comprehensive Standard Plan. 5.2 Circuit Power see [STEP 1] =___________ Watts 5.3 Circuit Current = (Circuit Power) / (AC voltage) = __________ Amps Table 4. Solar Load Center and Total Inverter Output OCPD and Conductor Size** Circuit Current (Amps) Circuit Power (Watts) OCPD (Amps) Minimum Conductor Size (AWG) Minimum Metal Conduit Size 24 5760 30 10 ½” 28 6720 35 8 ¾” 32 7680 40 8 ¾” 36 8640 45 8 ¾” 40 9600 50 8 ¾” 41.6 ≤ 10000 60 6 ¾” **CEC 690.8 and 210.19 (A)(1) Factored in Table 4, Conductors are copper, insulation must be 90°C wet‐rated. Table 4 values are based on maximum ambient temperature of 47°C (no rooftop temperature adder in this calculation), ≤ 3 current carrying conductors in a circular raceway. Otherwise use Comprehensive Standard Plan. 6. Point of Connection to Utility: 6.1 Load Side Connection only! Otherwise use the Comprehensive Standard Plan. 6.2 Is the PV OCPD positioned at the opposite end from input feeder location or main OCPD location? Yes No (If No, then use 100% row in Table 5) 6.3 Per 705.12(D)(2): (Combined inverter output OCPD size + Main OCPD size) ≤ [bus bar size × (100% or 120%)] Table 5. Maximum Combined Inverter Output Circuit OCPD Bus bar Size (Amps)100 125 125 200 200 200 225 225 225 Main OCPD (Amps)100 100 125 150 175 200 175 200 225 Maximum Combined Inverter OCPD with 120% of bus bar rating (Amps)20 50 25 60† 60† 40 60† 60† 45 Maximum Combined Inverter OCPD with 100% of bus bar rating (Amps)0 25 0 50 25 0 50 25 0 †This plan limits the maximum system size to less than 10 kW, therefore the OCPD size is limited to 60 A. ReducƟon of Main Breaker is not permitted with this plan. 7. Grounding and Bonding Check one of the boxes for whether system is grounded or ungrounded: Grounded Ungrounded For Microinverters with a grounded DC input, systems must follow the requirements of GEC (CEC 690.47) and EGC (CEC 690.43). For ACM systems and Microinverters with ungrounded a DC input follow the EGC requirements of (CEC 690.43). 8. Markings Informational note: ANSI Z535.4 provides guidelines for the design of safety signs and labels for application to products. A phenolic plaque with contrasting colors between the text and background would meet the intent of the code for permanency. No type size is specified, but 20 point (3/8”) should be considered the minimum. M NOTE: CEC 705.10 requires a permanent plaque or directory denoting all electric power sources on or in the premesis. CEC 690.54 CEC 690.54 & CEC 705.12(D)(4) WARNING DUAL POWER SOURCES SECOND SOURCE IS PHOTOVOLTAIC SYSTEM RATED AC OUTPUT CURRENT ______ AMPS AC NORMAL OPERATING VOLTAGE ______ VOLTS WARNING INVERTER OUTPUT CONNECTION DO NOT RELOCATE THIS OVERCURRENT DEVICE AC DC PV AC DC PV AC DC PV AC DC PV Optional AC Disconnect per AHJ PV SYSTEM AC DISCONNECT SECOND SOURCE IS PHOTOVOLTAIC SYSTEM RATED AC OUTPUT CURRENT ______ AMPS AC NORMAL OPERATING VOLTAGE ______ VOLTS Optional Solar Load Center AC DC PV AC DC PV AC DC PV AC DC PV AC ...CEC 705.12 (D)(7) Solar PV Standard Plan — Simplified Microinverter Systems for One‐ and Two‐Family Dwellings 9. Single‐Inverter Line DiagramProperty Owner: Property Address: Contractor: Contractor Phone: Contractor License Number: Contractor Class: SOLAR PV STANDARD PLAN ‐ SIMPLIFIED Microinverter and ACM Systems for One- and Two-Family Dwellings ROOF LAYOUT PLAN Items required to be shown:Building footprint and property lines, all panels, modules, clear access pathways, location of main service, approximate locations of electrical disconnecting means, roof access points and locations of any other structures on the property Property Owner: Property Address: Contractor: Contractor Phone: Contractor License Number: Contractor Class: SOLAR PV STANDARD PLAN ‐ SIMPLIFIED Microinverter and ACM Systems for One- and Two-Family Dwellings STRUCTURAL VIEWS Items requiredto be shown: 1. Existing roof types, slopes, roofing material and number of layers 2. Size, spacing, span and direction for existing rafters, ceiling joists and framing support members 3. Show location of load bearing walls on framing cross section 4. Details showing that solar PV panels are flush mounted 10” or less 5. Attachment details showing type, diameter and length of embedment of bolts and spacing; number of bolts per solar PV panel Property Owner: Property Address: Contractor: Contractor Phone: Contractor License Number: Contractor Class: