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HomeMy WebLinkAboutGENERATOR ADDITION RISER DIAGRAMI �J� "j-or2 f-� C(c(lrt-sue f�f ve��I-AO—A �s: 20RESB KOHLER. Power Systems j I u'l Ga l atural Gas r09001 V J KOHLER, t� POWCR SY51'r-1VS NATIONALLY REGISTERED The Kohler" Advantage • High Quality Power Kohler home generators provide advanced voltage and frequency regulation along with ultra -low levels of harmonic distortion for excellent generator power quality to protect your valuable electronics. • Extraordinary Reliability Kohler is known for extraordinary reliability and performance and backs that up with a premium five-year or 2000 hour warranty. • Perfect for Tight Lot Lines Can be placed as close as 18 inches from your home or small business, .providing installation flexibility even on smaller lots. * • Powerful Performance Exclusive PowerBoost- technology provides excellent starting power. • Fast Response Kohler's unique Fast -Response- excitation system delivers excellent voltage response and short-circuit capability. • Quiet Operation Kohler home generators provide quiet, neighborhood - friendly performance, Generator Ratings Standard Features • RDC2 Controller o One digital controller manages both the generator set and transfer switch functions (with optional Model RXT transfer switch) o Designed for today's most sophisticated electronics o Electronic speed control responds quickly to varying household demand o Digital voltage regulation protects your sensitive electronics from harmonic distortion and unstable power quality o Two-line, backlit LCD display with adjustable contrast is easy to read, even in direct sunlight or low light • Kohler Command PRO Engine Features o Kohler Command PRO@ OHV engine with hydraulic valve lifters for reliable performance without routine valve adjustment or lengthy break-in requirements o Powerful, reliable air-cooled performance o Simple field conversion between natural gas and LPG fuels while maintaining emission certification • Aluminum Sound Enclosure and Skid o Wind rated up to 181 mph o Weather -resistant cashmere textured finish • Designed for Easy Installation o Hinged, locking roof o Fuel and electrical connections through the enclosure wall eliminate the need for stub -ups through the bottom o Load connection terminal block allows easy field wiring o Designed for outdoor installation only • Certifications o Meets emission regulations for U.S. Environmental Protection Agency (EPA) with both natural gas and LPG Note: CARB does not regulate emergency standby generators with outputs less than 50 HP. Only the EPA standards apply. o UL2200 listed (60 Hz model) o CSA certification available (60 Hz model) • Warranty o 5-year/2000 hour warranty for on -grid (standby) applications in locations served by a reliable utility source Standby Ratings Natural Gas LPG Model Voltage Phase Hz Alternator kW/kVA Amps kW/kVA Amps 20RESB 120/240 1 60 2F7 18/18 75.0 20/20 83.3 115/230 1 50 2F7 14/14 60.8 15/15 65.2 RATINGS: Standby ratings apply to Installations served by a reliable utility source. All single-phase units are rated at 1.0 power factor. The standby rating is applicable to variable loads with an average load factor of 80 % for the duration of the power outage. No overload capacity is specified at this rating. Ratings are In accordance with ISO-3046/1, BS5514, AS2789, and DIN 6271. GENERAL GUIDELINES FOR DERATI NG: ALTITUDE: Derate 4 % per 305 m (1000 ft.) elevation above 153 m (500 ft.). TEMPERATURE: Derate 2 % per 5.5°C (10°F) temperature Increase above 16°C (60° F). Availability is subject to change without notice. The generatorset manufacturer reserves the right to change the design or specifications without notice and without any obligation or liability whatsoever. Contact your local Kohler Co. generator distributor for availability. Check the appliance manufacturer's specifications for actual power requirements. Consult a Kohler© Power Systems professional to calculate your exact residential power system requirements. • Unless otherwise directed by local codes. Generator must be located away from doors, windows, and fresh air Intakes. See the installation manual for guidelines. G4-244 (20RES6) 1/14 Alternator Specifications Alternator Specifications Specifications PowerBoost' Generator 1-Phase Manufacturer Kohler Output reconnectable 120/240 Type 2-Pole, Rotating Field Leads, quantity 4 Voltage regulator Digital Insulation: NEMA MG1-1.66 Material Class H Temperature rise Class H Bearing: quantity, type 1, Sealed Ball Coupling Direct Amortisseur windings Full Voltage regulation, no-load to full -load RMS ± 1.0% One-step load acceptance 100% of Rating Peak motor starting kVA @ 240 V: 20RESB 40.5 Engine Alternator Features • Compliance with NEMA, IEEE, and ANSI standards for temperature rise • Self -ventilated and drip -proof construction • Vacuum -impregnated windings with fungus -resistant epoxy varnish for dependability and long life • Superior voltage waveform and minimum harmonic distortion from skewed alternator construction • Digital voltage regulator with t1.0% no-load to full -load RMS regulation • Rotating -field alternator with static exciter for excellent load response • Total harmonic distortion (fHD) from no load to full load with a linear load is less than 5% Application Data Engine Specifications 20RESB Manufacturer Kohler Engine: model, type CH1000 4-Cycle Cylinder arrangement V-2 Displacement, cm3 (cu. in.) 999 (61) Bore and stroke, mm (in.) 90 x 78.5 (3.54 x 3.1) Compression ratio 8.8:1 Main bearings: quantity, type 2, Parent Material Rated RPM 60 Hz 3600 50 Hz 3000 Max. engine power at rated rpm, kW (HP) LPG, 60 Hz 23.0 (30.9) LPG, 50 Hz 20.0 (26.8) Natural gas, 60 Hz 20.2 (27.1) Natural gas, 50 Hz 16.8 (22.5) Cylinder head material Aluminum Valve material Steel/Stellite® Piston type and material Aluminum Alloy Crankshaft material Heat Treated, Ductile Iron Governor: type Electronic Frequency regulation, no load to full load Isochronous Frequency regulation, steady state ±0.5% Air cleaner type Dry Exhaust Exhaust System 20RESB Exhaust temperature exiting the enclosure at rated kW, dry, °C (°F) 260 (500) Engine Electrical Engine Electrical System 20RESB Ignition system Electronic, Capacitive Discharge Starter motor rated voltage (DC) 12 Battery (purchased separately): Ground Negative Volts (DC) 12 Battery quantity 1 Recommended cold cranking amps: (CCA) rating for -18°C (0°F) 500 Group size 26 Lubrication Lubricating System 20RESB Type Full Pressure Oil capacity (with filter), L (qt.) * 2.7 (2.9) Oil filter: quantity, type 1, Cartridge Oil cooler Integral * Oil capacity for a new, dry engine. Fuel Pipe Size Minimum Gas Pipe Size Recommendation, in. NPT 20RESB Natural Gas LPG Pipe Length, 281,000 340,000 m (ft.) Btu/hr. Btu/hr. 8 (25) 1 3/4 15 (50) 1 1 30 (100) 1 1/4 1 46 (150) 1 1/4 1 1/4 61 (200) 1 1/4 1 1/4 G4-244 (20RESB) 1/14 9 .D � 1 Fuel Requirements Fuel System 20RESB Fuel types Natural Gas or LPG Fuel supply inlet 1/2 NPT Fuel supply pressure, kPa (in. H20): Natural gas 1.2-2.7 (5-11) LP 1.7-2.7 (7-11) Fuel Composition Limits * Nat. Gas LPG Methane, % by volume (minimum) 90 min. - Ethane, % by volume (maximum) 4.0 max. - Propane, % by volume 1.0 max. 85 min. Propene, % by volume (maximum) 0.1 max. 5.0 max. C4 and higher, % by volume 0.3 max. 2.5 max. Sulfur, ppm mass (maximum) 25 max. Lower heating value, MJ/m3 (Btu/ft3), (minimum) 33.2 (890) 84.2 (2260) * Contact your local distributor for suitability and rating derates based on fuel compositions outside these limits. Operation Requirements Fuel Consumption Fuel Fuel Consumption, m3/hr. (cfh) Model Type % Load 60 Hz 50 Hz 100 8.0 (281) 6.4 (225) 75 6.9 (243) 5.4 (189) Natural 50 4.6 (161) 3.9 (139) Gas 25 3.6 (127) 2.9 (103) Exercise 2.0 (71) 2.0 (71) 20RESB 100 3.9 (136) 2.9 (102) 75 3.1 (109) 2.4 (85) LPG 50 2.3 (82) 1.8 (63) 25 1.7 (59) 1.3 (47) Exercise 1.0 (35) 1.0 (35) Nominal fuel rating: Natural gas: 37 MJ/m3 (1000 Btu/ft.3) LPG: 93 MJ/m3 (2500 Btu/ft.3) LPG conversion factors: 8,58 ft.3 = 1 lb. 0.535 m3 =1 kg 36.39 ft.3 = 1 gal. Sound Data Model 20RESB 8 point logarithmic average sound levels are 64 dB(A) during weekly engine exercise and 69 dB(A) during full -speed generator diagnostics and normal operation. For comparison to competitor ratings, the lowest sound levels are 62 dB(A) and 67 dB(A) respectively.* All sound levels are measured at 7 meters with no load. * Lowest of 8 points measured around the generator. Sound levels at other points around generator may vary depending on installation parameters. RDC2 Controller Voltage: V O Freq: fi0.00.0 Hz O 0 0 o O �9 S 0 urta T0 0 o-C3 The RDC2 controller provides integrated control for the generator set, Kohler@ Model RXT transfer switch, programmable interface module (PIM), and load control module (LCM). The RDC2 controller's 2-line LCD screen displays status messages and system settings that are clear and easy to read, even in direct sunlight or low light. RDC2 Controller Features • Membrane keypad o OFF, AUTO, and RUN push buttons o Select and arrow buttons for access to system configuration and adjustment menus • LED indicators for OFF, AUTO, and RUN modes • LED indicators for utility power and generator set source availability and ATS position (Model RXT transfer switch required) • LCD display o Two lines x 16 characters per line o Backlit display with adjustable contrast for excellent visibility in all lighting conditions • Scrolling system status display o Generator set status o Voltage and frequency o Engine temperature o Oil pressure o Battery voltage o Engine runtime hours • Date and time displays • Smart engine cooldown senses engine temperature • Digital isochronous governor to maintain steady-state speed at all loads • Digital voltage regulation: ± 1.0% RMS no-load to full -load • Automatic start with programmed cranking cycle • Programmable exerciser can be set to start automatically on any future day and time, and run every week or every two weeks • Exercise modes o Unloaded weekly exercise with complete system diagnostics o Unloaded full -speed exercise o Loaded full -speed exercise (Model RXT ATS required) • Front -access mini USB connector for SiteTech' connection • Front access mini -breaker protects the alternator • Integral Ethernet connector for Kohler® OnCue " • Built-in 2.5 amp battery charger • Remote two -wire start/stop capability for optional connection of Model RDT or RSB transfer switches See additional controller features on the next page. G4-244 (20RESB) 1/14 KOHLER CO., Kohler, Wisconsin 53044 USA Kohler Power Systems Phone 920-457-4441, Fax 920-459-1646 Asia Pacific Headquarters For the nearest sales and service outlet in the 7 Jurong Pier Road US and Canada, phone 1-800-544-2444 Singapore 619159 KOHLERPower.com Phone (65) 6264-6422, Fax (65) 6264-6455 Additional RDC2 Controller Features • Diagnostic messages o Displays diagnostic messages for the engine, generator, Model RXT transfer switch, programmable interface module (PIM), and load control module (LCM) o Over 70 diagnostic messages can be displayed • Maintenance reminders • System settings o System voltage, frequency, and phase o Voltage adjustment o Measurement system, English or metric • ATS status (Model RXT ATS required) o Source availability o ATS position (normal/utility or emergency/generator) o Source voltage and frequency • ATS control (Model RXT ATS required) 0 Source voltage and frequency settings o Engine start time delay o Transfer time delays o Voltage calibration 0 Fixed pickup and dropout settings • Programmable Interface Module (PIM) status displays o Input status (activefinactive) o Output status (active/inactive) • Load control module (LCM) menus o Load status o Test function Generator Set Standard Features • Battery cables • EPA certified fuel system • Aluminum sound enclosure • Critical silencer • Field -connection terminal block • Fuel solenoid valve and secondary regulator • Line circuit breaker, 100 amps • Multi -fuel system, LPG/natural gas, field -convertible • Oil drain extension with shutoff valve • Premium five-year/2000 hour limited warranty • RDC2 generator set/ATS controller • Rodent -resistant construction • Sound -deadening, flame-retardant foam per UL 94, class HF-1 Available Options Approvals and Listings ❑ CSA Approval Communication Accessories ❑ OnCue@ Generator Management System Controller Accessories ❑ Programmable Interface Module (PIM) (provides 2 digital inputs and 6 relay outputs) ❑ Load Control Module (LCM) (provides 4 power relays and 2 HVAC relays) Available Options, Continued Electrical System ❑ Battery ❑ Battery heater Fuel System ❑ Braided stainless steel flexible fuel line Literature ❑ General maintenance literature kit ❑ Overhaul literature kit ❑ Production literature kit Starting Aids ❑ Carburetor heater (recommended for reliable starting at temperatures below 0°C [32°F]) ❑ Fuel regulator heater pad (recommended for reliable starting at temperatures below -18°C [0°F]) Kohler@ Automatic Transfer Switch ❑ Model RXT, see specification sheet G11-121 ❑ Model RDT, see specification sheet G11-98 ❑ Model RSB, see specification sheet G11-101 ❑ Other Kohler@ ATS Miscellaneous Accessories a Generator Set Dimensions and Weights Overall Size, L x W x H: 1215 x 733 x 802 mm (47.9 x 28.8 x 31.6 in.) Shipping Weight (with aluminum enclosure) 240 kg (530 lb.) I 0 0 I I l` L A I` W NOTE: Dimensions are provided for reference only and should not be used for planning Installation. Contact your local distributor for more detailed Information. DISTRIBUTED BY- © 2014 by Kohler Co. All rights reserved. G4-244 (20RESB) 1/14 M 1 ABBREVIATIONS: AC ALTERNATING CURRENT MTS MANUAL TRANSFER SWITCH A/C AIR CONDITIONING MLO MAIN LUGS ONLY AL ALUMINUM NEC NATIONAL ELECTRICAL CODE AHU AIR HANDLING UNIT. NTS NOT TO SCALE ATS AUTOMATIC TRANSFER SWITCH NEMA NATIONAL ELECTRICAL MANUFACTURERS AMP AMPERE ASSOCIATION AFCI ARC FAULT CIRCUITINTERRUPTER _ NFPA NATIONAL FIRE PROTECTION ASSOCIATION ANSI AMERICAN NATIONAL STANDARDS INSTITUTE NON -SE NON SERVICE ENTRANCE RATED C CONDUIT PLCS PLACES (QUANTITY) CU COPPER CONDUCTOR PNL PANEL COVB CITY OF VERO BEACH PVC POLYVINYL CHLORIDE CONDUIT OC DIRECT CURRENT RMC RIGID METAL CONDUIT DISC DISCONNECT RTU ROOF TOP UNIT EXIST EXISTING SE SERVICE ENTRANCE RATED FPL FLORIDA POWER & LIGHT TYP TYPICAL G GROUND TEMP TEMPORARY GFCI GROUND FAULT CIRCUIT INTERRUPTER UG UNDERGROUND IRC INDIAN RIVER COUNTY UL UNDERWRITERS LABORATORY KVA KILOVOLTAMPERE UON UNLESS OTHERWISE NOTED KW KILOWATT V VOLT MC METAL CLAD CABLE VA VOLT AMPERE MCB MAIN CIRCUIT BREAKER W WATT MCC MOTOR CONTROL CENTER XFMR TRANSFORMER MOP MAIN DISTRIBUTION PANELBOARD FiLL i ELECTRICAL LEGEND: _= SURFACE MOUNT 120/204V,10, 3-WIRE PANELBOARD �._• FLUSH MOUNT 120/204V, 10, 3-WIRE PANELBOARD Q— SURFACE MOUNT 277/480V, 30, 4-WIRE PANELBOARD FLUSH MOUNT 277/480V, 30, 4-WIRE PANELBOARD = UTILITY METER CAN OR METER CAN/COMBO UNIT —�— SURFACE MOUNT AUTOMATIC TRANSFER SWITCH FRAMESIZE ^ff NF`R� NEMARAMNG NON -FUSED DISCONNECT —1 C .�----" '�— NON FUSED FRAME SIZE 30 3R NEMARATING FUSEDDISCONNECT _r�'s1OAF" FUSE SIZE GENERATOR ANO GENERATOR PAD -07D ` � GAS STORAGE TANK. GENERAL NOTES- 1. LIGHT LINE WORK REPRESENTS EXISTING TO REMAIN. 2. DARK AND RED LINE WORK REPRESENT NEW EQUIPMENT, CONDUIT, AND WIRE. CONDUIT AND WIRE SCHEDULE SYMBOL DESCRIPTION OA (EXISTING) 2-PVC UNDERGROUND SERVICE FEEDER O (EXISTING) OVERHEAD SERVICE FEEDER © (DUSTING)112"PVC #110 BARE CU DO (EXISTING)1 114"PVC W! (3) #3 THHN CU, (1) #8 THHN CU GROUND O (EXISTING) 2-PVC WI (3) #310 THHN CU O 1412"PVC W/ GENERAC CABLE & (3) #3 THHN CU, (1) 8 THHN GROUND, (5) #14THHN CU © (EXISTING) 2-PVC W/ (3) #3 THHN CU, (1) #8 THHN CU GROUND O (EXISTING) 31CPVC WI (7) #14 THHN CU Oj (EXISTING)1/2-PVC W/ (1)94 BARE CU �`iLE "Ai-PY C O(EXISTING) (EXISTING) (EXISTING) (EXISTING) Kohler 225 AMP 225 AMP 200 AMP 100 AMP (EXISTING) MCB MCB EAN-S GEN �S��TIAN�BLVD 0•�' 400AMP PANEL PANEL NOTED PANEL SEBASTIAN,R.32M METER SOCKET RATED TR2)388-0533 120/240 1.p —0— ' Sizing Report Rated Nominal Voltage 240 A E G D Generator FuelChoioe Propene Sizing Method (NEC 22D) Part IV C I E • (Part Ilt raQnaed for seleasd eiarll irplememalien, Balh valid tar wfi01e haae) General Lighting & Reaptades Load (kW) SQaare Footage Being Covered (k12) 1200 98 SneOAppiarroe CdaitS (2D amps) (NEW) GENERATOR: KRM m Ckct is 2 3 AIR COOLED LoundyCkctft 1 1.6 j KOHL.ER 20KW ®SgFAAKKER Faoed-e•PI.ADolim,&Motors loads Estimated Nameplate (w) 240V Load(kW) GRADE GRADE uw 6.5 X 65 Niav"wo 1.3 13 tL RefdgeraW 08 OS Roldgorabr 0.8 02 - GDO Do 12 1A Managed i Estimated AIr Condllllwft & Cooing toads ( 240 V Iaad (kWl 3.0 Ton UrX 30 X 0.0 5oTmUna X ao X o.o (EXISTING) (2) 5/8" X 8' —�� CUGROUND RODS (EXISTING) Managed Estimated Name" 24o V Load 1kyY1 WATER LINE Heating a meal PUMPS Loads w heading el nerd#1 X 0.0 40 X 0.0 heaft element 42 X 0.0 30 X 08 SCOPE OF WORK: GENERAL NOTES: • ALL EQUIPMENT, CONDUITS, AND FEEDERS ARE EXISTING TO REMAIN. • THE ELECTRICAL CONTRACTOR SHALL VERIFY AND COORDINATE ALL ELECTRICAL SERVICE ROUGH IN AND INSTALLATION EstlOelad PAW Ul®zed • .UTILIZE EXISTING CONCRETE PAD FOR GENERATOR. DETAIL WITH THE LOCAL UTILITY POWER COMPANY. Trarmierd erterrt (LRA) 01" (LM) • PROVIDE AND INSTALL (1) 20kW KOHLER LP GAS GENERATOR. THIS ELECTRICAL INSTALLATION SHALL BE IN ACCORDANCE WITH THE FLORIDA BUILDING CODE LOCAL ORDINANCE, AND LargestNblorkSterltrgAn" ( 276 152 152 • LOAD SHED PER SIZING DATA THIS SHEET. THE NATIONAL ELECTRIC CODE, PRESENTLY IN EFFECT. load NEC • GENERATOR LP GAS CONNECTION BY SECURE GAS AS A SUBCONTRACTOR UNDER • ALL ELECTRICAL WORK FOR THE ENTIRE PROJECT SHALL BE PERFORMED IN A NEAT AND CRAFTSMAN LIKE MANNER BY SuarytCLoad� THIS PERMIT. PERSONS SKILLED IN THE ELECTRICAL TRADE, AND SHALL BE DONE UNDER THE SUPERVISION OF A MASTER ELECTRICIAN General & Reoades at • NO NEW BRANCH CIRCUIT LOADS SHALL BE ADDED TO HOUSE PANEL UNDER THIS LICENSED IN THE STATE OF FLORIDA. pmdin PlaceApoan cea & Motors 9.B SCOPE OF WORK. • THIS ELECTRICAL INSTALLATION SHALL BE PROTECTED FROM PHYSICAL DAMAGE AND SECURELY SUPPORTED AND w ��� s/ FASTENED, WITH WORKING SPACE PER NEC 11026: Stmr°tall General Loads 17•g 132 ?r f/ • PVC SCHEDULE 40 CONDUIT SHALL BE USED UNDERGROUND, IN OR BELOW CONCRETE AND WHERE EXPOSED NOT i. L ?11 AUNTY B1[ MDLN WI MION SUBJECT TO DAMAGE. PVC SCHEDULE 80 CONDUIT SHALL BE USED WHERE EXPOSED, SUBJECT TO DAMAGE. g o 0 • ALL MATERIAL SHALL BE NEW, FREE FROM DEFECT AND SHALL BE LISTED AND BEAR THE LABEL OF A RECOGNIZED Uner f Hea ft&Coo&V 0 0 REVIEWED &Oi3CO.7IPL E j TESTING LABORATORY. Larger oftteatngacoo0rg 0 0 ItEVIE.9ILi3 FOR • GROUNDING PER NFPA 702011 EDITION ARTICLE250. Slang based anragrtremenmofNEC Artide220,Part IV 132 • STANDBY SYSTEM INSTALLATION PER NFPA 70 2011 EDITION ARTICLE 702, AND MANUFACTURER INSTALLATION Elevation ott DATE •' INSTRUCTIONS. i)ulmamsize gw0abrfor mob( sta(r .egrimments 20 FLANS Al�� ; ERtIiI7( MUSTBE O1� ZOB en, load reqdud �400° LOAD MANAGEMENT OR NO INSPECTION VYML BE MADE. 'LCM` LOAD SHED 20 kW Kohler Model Generator Recommended LOAD MANAGEMENT TECHNOLOGY ALLOWS THE LOAD CONTROL MODULE TO MONITOR GENERATOR PERFORMANCE AND ONLY SHED LOADS WHEN ABSOLUTELY NECESSARY BY MONITORING GENERATOR CURRENT AND FREQUENCY. BY ONLY SHEDDING THE NONESSENTIAL CIRCUITS, THE ESSENTIAL CIRCUITS ARE ALWAYS POWERED. LOADS ARE SHED THROUGH INTERRUPTION OF INDIVIDUAL CONTROL CIRCUITS (AHUTAC) AND POWER CIRCUITS (RANGE AND WATER HEATER). NO.SCALE! GENERATOR ADDITION RISER DIAGRAM } Z 00N t0 U0'N � Z C9 UaLLq ao WQQM Lu m W r< m N W L U O U t U Ir W W O U w 5 a O Q F— 0aaa1 LL M � Ix LLL Q � W W LL Z J W W �m�a Ci ~ W CD Z rLL E1 -E.12/19/2017 . ,. 1 OF 2 FiLE -Copy OD DOCK VCAPPED SEAWALL PROPERTY LINE 206.78' _EDGE OF 20.0'REAR BUILDING SETBACK (NEW) GENERATOR LOCATION 18" MIN FROM HOUSE ON EXISTING CONCRETE PADal SPA COVERED PATIO 0 ,(EXISTING) go C-4 =POOL�__� 71z AC' Z c� < cn LL 9 (EXISTING) PANELS _j w P U) Z 1 SINGLE FAMILY LLI M (EXISTING)ATS Ff RESIDENCE I.— LLI F, 129 QUEEN ISABELLA CT. LU cl) co IL w a FORT PIERCE, FL 34949 rim) (L cf) M co LU o' U) GARAGE LLJ u , L7 OZ 15.0'FRONT BUILD ING SETBACK Ill w z 0 CED PROPERTY LINE 152.50, -8 (EXISTING) 500 GAL 0 0) LP TANK LOCATION LL LL. w Z LLJ Q w co W [L QUEEN ISABELLA CT. z 0 100 GENERATOR SITE PLAN E2 12119/2017 .1 1. 20F2