Generac 004373-1, 004626-0 Emergency Circuit Isolation Method, Grounding the Generator

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Section 2 — Installation

Guardian Liquid-cooled 40 kW Generator

Figure 2.1 – Basic Standby Electric System

2.2 EMERGENCY CIRCUIT ISOLATION METHOD

This prevents overloading the generator by keeping elec- trical loads below the wattage/amperage capacity of the generator. If the generator is powering only critical loads, within its wattage/amperage capacity, during util- ity power outages, consider using the emergency circuit isolation method.

Critical electrical loads are grouped together and wired into a separate “Emergency Distribution Panel.” Load circuits powered by that panel are within the wattage/amperage capacity of the generator set. When this method is used, it is difficult to overload the gener- ator. The transfer switch must meet the following requirements:

It must have an ampere rating equal to or greater than the total amperage rating of the emergency dis- tribution panel circuit.

It must be installed between the building’s main distri- bution panel and the emergency distribution panel.

2.3 TOTAL CIRCUIT ISOLATION METHOD

When a generator capable of powering all electrical loads in the circuit is to be installed, use the “Total Circuit Isolation Method.” It is possible for the genera- tor to be overloaded when this isolation method is employed. The following apply to the transfer switch in this type of system.

Ampere rating of the transfer switch must be equal to or greater than the ampere rating of the normal incoming utility service.

The transfer switch must be installed between the utility service entrance and the building distribution panel.

2.4 GROUNDING THE GENERATOR

The National Electrical Code requires the frame and external electrically conductive parts of this equipment to be properly connected to an approved earth ground and/or grounding rods. For that purpose, a GROUND LUG (Figure 2.2) is provided on the generator mounting base. Consult a qualified electrician for grounding requirements in your area. Grounding procedures must meet local regulations.

Do not connect the ground wire to any pipe that carries a flammable or explosive substance – FIRE or an EXPLOSION may result.

Proper grounding helps protect personnel against electri- cal shock in the event of a ground fault condition in the generator or in connected electrical devices. In addition, grounding helps dissipate static electricity that often builds up in ungrounded devices.

Figure 2.2 – Generator Grounding Lug (typical)

2.5 GENERATOR AC NEUTRAL CONNECTIONS

Generac uses an UNGROUNDED AC neutral. Grounding is recommended only at the main service entrance.

2.6TRANSFER SWITCH START SIGNAL CONNECTIONS

2.6.1 “GTS” Type Switch

Connect the two-wire start signal from the automatic transfer switch to the automatic start connection, which is located in the right hand corner inside the lower panel. Match wires 178 and 183 in the transfer switch to 178 and 183 on the terminal strip in the control panel. The conductors for the two-wire start circuit must be in their own conduit.

2.6.2 Pre-Packaged Type Switch

Connect the six signal wires from the automatic trans- fer switch to the engine generator control, which is located on the upper right side and inside the lower control panel. Match wires 23, 194, N1, N2, T1 and T2 in the transfer switch to the corresponding wires on the terminal strip in the lower panel. The conductors for these wires must be in seperate conduit from the main AC output wires.

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Contents Power SYSTEMS, INC Authorized Dealer Location IntroductionSection Installation Drawings 56-57 Warranty Back Cover Safety Rules General InformationInstallation MaintenanceGeneral Hazards Electrical Hazards Automatic System Operation UNPACKING/INSPECTIONGenerator Generator AC Connection SystemsEngine Protective Devices SpecificationsMain Circuit Breaker Conversion to LP GAS Vapor Fuel Requirements RecommendationsGenerator and Load Compatibility EngineAIR Fuel Ratio Controller CoolantEmissions Control System Other Published Standards Standby Generator InstallationBasic Standby Electric System Nfpa StandardsEmergency Circuit Isolation Method Transfer Switch Start Signal ConnectionsGTS Type Switch Pre-Packaged Type SwitchVented Batteries Battery InstallationPreparation Before START-UP Prior to Initial START-UP Using the AUTO/OFF/MANUAL Switch Sequence of Automatic Operation OFF PositionManual Position Automatic Transfer OperationChecking the Engine OIL Level Weekly Exercise CycleEngine Oil Recommendations Oil and Filter Change ProcedureChanging the Engine AIR Cleaner Changing the Engine OIL and FilterSpark Plugs Battery MaintenanceDC Fuse Miscellaneous MaintenanceCleaning the Generator Overload Protection for Engine DC Electrical SystemReturn To Service OUT of Service ProcedureRemoval From Service SYSTEM/COMPONENT Procedure Frequency Service ScheduleProblem Cause Correction Troubleshooting GuideElectrical Data Section Power Systems, Inc Generac Power Systems, Inc Electrical Data Electrical Data Electrical Data Wiring Diagram DPE RED Brush UnitsPanel Face Part of Control Panel Wire Harness Switch Rocker Dpst 125V SPDSwitch TOG Dpdt 15/10 SP Switch Selector 6A AMP/VGenerators Cover Plate Egov CONTROLLER, B-C #DPG-2103Screen Cover Plate AVRCover Conn Housing Assembly Motor StepperConnector Interface Assembly Housing Governor ConnectDIRECT-COUPLED BASE, Mounting ASSEMBLY, 4.3LAssembly Groundwire 10/3/8 Plug Button 3 DIA4640 31 33 Pulley Tensioner Switch OIL PressureDC Alternator Assembly Engine 4.3L GMExploded Views and Parts Lists Connector C/C Vent Retainer Plug WiresRetainer Spark Plug Wires Wires Spark Plug 4.3LAdd item #42 vinyl trim as shown Carrier Rear Bearing FAN Assembly 390 SAE DDAssembly Brush & Shunt Assembly Scroll 390 SAEDuct Front Panel Assembly Cover AccessDuct Bottom Shakeproof INT M6 SSVenturi 16 DIA 35KW Tank Coolant RecoveryBracket Coolant Recovery Tank Radiator 14 FIN/INCHGasket Carburetor Adaptor Plate AIR Cleanr BottomPlate AIR Cleaner TOP Gasket AIR CleanerActuator Throttle 42MM Mixer only Natural GASNPT X Hose 1 in ID LP GASHose 1IN ID LP GAS Support Solenoid NAT GASNipple TOE 3/4 NPT X Nipple Pipe 3/4NPTX4.5 BLK IRNDECAL,INLET Pressure Regulator N/G R600SLUG Rngtng INS HOSE, Preformed Block Heater Hose Connection TEEHEATER, Engine 1800W HEATER, Engine 2000WCable Battery RED #1 X Battery 12VDC 90-AH 27F OptionalHold Down Battery Cable Battery Black #1 X11 12 Transformer 200A to 5A 5VA Cover Lower Connection BOXBushing Snap SB-2.5-31 Relay Solenoid 12VDC PNL MNTExploded Views and Parts Lists Shield Heat Crossover 4.3L Tube Straight a GroupMuffler Catalyst 4.3L Mounting Band A-GRP CatalystClamp Band Muffler Muffler 2-1/2 INLET/OUTLETGuardian Liquid-cooled 40 kW Generators Installation Drawings 12V Battery see Note Lifting EYE Places This Warranty Shall not Apply to the Following Warranty Schedule