Solar PV Safety for the Fire Service. Bill Brooks, Brooks Engineering Panel Lead: Code Official Panel, Solar ABC s
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1 Solar PV Safety for the Fire Service Bill Brooks, Brooks Engineering Panel Lead: Code Official Panel, Solar ABC s
2 Presentation Overview Brief overview of PV system equipment Fire issues with PV systems Case Studies Field inspection issues of concern 2011 NEC Language to help firefighters 2012 IFC and NFPA1 updates for PV Proposals for 2014 NEC and 2015 IFC and NFPA1
3 Photovoltaic System Basics characteristics and equipment
4 Connect Cells To Make Modules One silicon solar cell produces about 0.5 volts. 36 cells connected together have enough voltage to charge 12 volt batteries. 60- to 72-cell modules are common for gridconnected systems operating at about Volts each. Module is the basic building block of systems. Can connect modules together to get any power configuration (limited by voltage).
5 Current (amps) Current varies with irradiance Performance at Different Irradiances W/m2, 25 oc 800 W/m2, 25 oc 600 W/m2, 25 oc 400 W/m2, 25 oc 200 W/m2, 25 oc Voltage (volts)
6 Integrated PV Modules
7 Photo by M. Paiss Framed, BIPV, Flexible Photo courtesy of Uni-Solar
8 Inverters - Residential Photo courtesy of Independent Energy Systems
9 Locations will vary Photo by M. Paiss Disconnects will vary Photo courtesy of Independent Energy Systems
10 Photo courtesy of E.Oakes Microinverter
11 Standoff-Mounted Arrays
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14 The Patio Cover
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16 EBay Headquarters, San Jose, CA
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18 TYPICAL COMMERCIAL COMPONENTS Inverter(s) and Disconnecting Means
19 TYPICAL COMMERCIAL COMPONENTS Inverter(s) and Disconnecting Means (multiple inverters)
20 TYPICAL COMMERCIAL COMPONENTS Array (PV Modules and Mounting Equipment)
21 TYPICAL COMMERCIAL COMPONENTS Array (PV Modules and Mounting Equipment)
22 Wiring (conductors, combiner boxes, conduit, disconnects)
23 TYPICAL COMMERCIAL COMPONENTS Wiring (conductors, combiner boxes, conduit, disconnects)
24 PV Combiner Boxes
25 Current Code Activities California s guidelines are reasonable for suburban departments that routinely fight fires from rooftops regardless of regional location. Both the IFC and UFC (NFPA 1) adopted language similar to the California document for the upcoming 2012 editions of these codes. The 2011 NEC includes several updates to address fire service concerns. The solar industry and the fire fighting community need to work together to refine construction codes and standard operating procedures for firefighters.
26 Basic hazard info for Firefighters Electrical Shock Trips and Slips Dead Load
27 Case Study: Bakersfield Mercantile Fire, April 2009 Photo courtesy of KCFD
28 Membrane roofing & foam over metal decking Photo courtesy of KCFD
29 Photos courtesy of KCFD This is 3 in. conduit
30 Arcing present Acring Photo courtesy of KCFD
31 Case Study: Simi Valley BIPV Fire - March 2009 Photo courtesy of VCFD
32 Possible shading issues Photos courtesy of VCFD
33 Overhaul necessary, but Photo courtesy of VCFD
34 Photo courtesy of VCFD Is this wise?
35 Ensuring the fire is out is the job of the fire service. Photo courtesy of J.Davis
36 Great labeling unable to secure utilities Photo courtesy of M. Paiss
37 Key Points Identify & communicate the PRESENCE of a PV system. Key components of a PV system: Array, Inverter, Conduit, Labeling. Safely operate around a PV system Isolate power to degree possible Stay away from damaged system Request Solar Contractor to secure system
38 Next Steps with Fire Officials Educate officials about 2011 NEC updates. Provide basic PV operational-level training so they better understand the technology and hazards. Developed white paper with recommendations for implementation of guidelines. (solarabcs.org) Work with developments of NFPA 1 and the IFC F-30 documents to help see that regulations are properly implemented.
39 Field Inspection
40 Appropriate signs installed Sign construction Photovoltaic Power Source AC point of connection inverter matches one-line alternative power system Optional Standby System (if battery-backed unit)
41 Signs and Labels
42 Signs and Labels
43 Wire Management
44 Wire Management
45 What you can t see won t hurt you??
46 Electrical Code Enforcement
47 Correct Fuses??
48 Access Pathways & Good Installation
49 Nice Work
50 New 2011 Relevant NEC Requirements (E) (E) Circuit Routing. Photovoltaic source and PV output conductors, in and out of conduit, and inside of a building or structure, shall be routed along building structural members such as beams, rafters, trusses, and columns where the location of those structural members can be determined by observation. Where circuits are imbedded in built-up, laminate, or membrane roofing materials in roof areas not covered by PV modules and associated equipment, the location of circuits shall be clearly marked.
51 New 2011 Relevant NEC Requirements (E) (New) Wiring methods shall not be installed within 25 cm (10 in.) of the roof decking or sheathing except where directly below the roof surface covered by PV modules and associated equipment. Circuits shall be run vertically from the roof penetration point to supports a minimum of 25 cm (10 in.) below the roof decking. Informational Note: The 25 cm (10 in.) requirement is to prevent accidental damage from saws used by firefighters for roof ventilation during a structure fire.
52 New 2011 Relevant NEC Requirements (E) (New-continued) Where flexible metal conduit (FMC) or metal clad cable (MC) smaller than metric designator 21 (trade size 3 4) containing PV power circuit conductors is installed across ceilings or floor joists, the raceway or cable shall be protected by substantial guard strips that are at least as high as the raceway or cable. Where run exposed, other than within 1.8 m (6 ft) of their connection to equipment, these wiring methods shall closely follow the building surface or be protected from physical damage by an approved means.
53 Understanding the 2012 International Fire Code and NFPA1 PV Regulations Developed by Bill Brooks, PE
54 Fire Service Contributors Vickie Sakamoto, CAL FIRE-OSFM Kevin Reinertson, CAL FIRE-OSFM Matthew Gatewood, Los Angeles Fire Department Denise Enea and Marshall Hird, Woodside Fire Department Jim Hone, Santa Monica Fire Department Kent Miller, Port of Stockton Ken Kwong and Elizabeth Brueck, Sacramento Fire Department Lisa Beaver, SMUD Ron Keefer, Menlo Park Fire Department Tim Ippolito, Roseville Fire Department Wes Kitchel, Santa Rosa Fire Department Scott Poster, County of Los Angeles Fire Department Ed Hadfield, Coronado Fire Department William Bigariani, San Francisco Fire Department
55 Solar and other Contributors CalSEIA Sue Kateley, CalSEIA Gary Gerber, Sun Light & Power Edgar Becerra, Sharp Solar Colin Murchie, SunEdison John Hostetter, REC Solar, Inc. Mark Mrohs, Kurt Johnson, Gary Neate, Dylan Anderson, and Carl Lenox, SunPower Peter Rive, SolarCity Kirk Uhler and Carl Woods, SolarPower, Inc. Additional Participants Bill Brooks, Brooks Engineering John Taeker, Underwriters Laboratories
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57 1.0 MARKING (IFC ) Marking is needed to provide emergency responders with appropriate warning and guidance with respect to isolating the solar electric system. This can facilitate identifying energized electrical lines that connect the solar modules to the inverter, as these should not be cut when venting for smoke removal. Materials used for marking should be weather resistant. Use UL 969 as standard to weather rating (UL listing of markings is not required). Vinyl signs need to meet UL969 requirements while plastic and metal engraved signs do not need to meet the UL standard.
58 Examples of Plastic Engraved and Vinyl Signs
59 Sign Requirements MARKING CONTENT: CAUTION SOLAR CIRCUIT (NEC and IFC uses Warning: Photovoltaic Power Source) RED BACKGROUND, WHITE LETTERING, MINIMUM 3/8 LETTER HEIGHT, ALL CAPITAL LETTERS, ARIAL OR SIMILAR FONT, NON-BOLD, REFLECTIVE, WEATHER RESISTANT MATERIAL (durable adhesive materials meet this requirement)
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62 2.0 ACCESS, PATHWAYS AND SMOKE VENTILATION (IFC ) Section 2.0 relates to fire departments that engage in vertical ventilation operations. Some departments are beginning to limit vertical ventilation for lightweight construction. Other buildings already have automatic roof vents making roof access unnecessary. Metal and concrete decked buildings are rarely trenched, so access to vents and skylights is all that may be necessary.
63 Purpose of Section 2.0 Access and spacing requirements should be observed in order to: Ensure access to the roof Provide pathways to specific areas of the roof Provide for smoke ventilation opportunities area Provide emergency egress from the roof
64 Exceptions to Section 2.0 Local jurisdictions may create exceptions to this requirement where access, pathway or ventilation requirements are reduced due to: Proximity and type of adjacent exposures Alternative access opportunities (as from adjoining roofs) Ground level access to the roof area in question
65 Exceptions to Section 2.0 (cont.) Adequate ventilation opportunities beneath solar array (as with significantly elevated or widelyspaced arrays) Adequate ventilation opportunities afforded by module set back from other rooftop equipment (shading or structural constraints may leave significant areas open for ventilation near HVAC equipment, for example.) Automatic ventilation device. New technology, methods, or other innovations that ensure adequate fire department access, pathways and ventilation opportunities.
66 Roof Ventilation Residential Roof Layouts Ventilation (IFC ) 3 space along ridge of roof Ridge setback based on enough room to make 2 wide ventilation cut. ASCE 7, Minimum Design Loads for Buildings, requires this setback in high wind locations (e.g. eastern seaboard) No rooftop disconnect requirement. (see appendix) Each roof face treated independently. PV array and wiring is off limits to fire fighters.
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68 Roof Access Residential with Single Ridge (IFC ) Single ridge needs two 3 pathways on array faces along edge of load bearing exterior wall.
69 Full Gable
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72 Access Commercial (IFC ) Commercial flat roof with no roof dimension more than 250 feet 4 space around perimeter wall. Commercial flat roof with a roof dimension more than 250 feet 6 space around perimeter wall. No rooftop disconnect requirement for fire fighters.
73 Pathways and Ventilation Commercial (IFC & ) Minimum 4 pathway on center access of building in both directions. A 4 access to skylights, roof hatches, and fire standpipes shall be provided to the perimeter wall. Commercial rooftop arrays shall be no greater than 150 by 150 feet in distance in either axis. Array off limits to fire fighters.
74 Commercial < 250
75 Commercial > 250
76 LOCATION OF DC CONDUCTORS (IFC ) To limit the hazard of cutting live conduit in venting operations, DC wiring should be run in metallic conduit or raceways when located within enclosed spaces in a building and should be run, to the maximum extent possible, along the bottom of load-bearing members. Intent is to stay away from common ventilation locations near ridge. Staying under load-bearing members minimizes likelihood of saws cutting wiring system.
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78 Commercial Systems: Difficult Access Example
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84 Future Code Activities NFPA tasked NEC Code Making Panel 4 to discuss and develop proposals for firefighter safety for 2014 NEC. Proposals submitted in November One NEC proposal would require module-level shutdown on all PV systems on buildings IBC proposals due in January Other I- Code proposal deadlines throughout Efforts underway to refine current language. The solar industry and the fire fighting community need to work together to refine construction codes and standard operating procedures for firefighters.
85 Craig Allyn Rose Photography - Emergencyphoto.com CONCLUSION
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