GENERATORSETENCLOSURE
(PPPISTDWalk-in)
PART1- GENERAL
1.01 INTENT
A.Theintentofthisspecificationistoprovidetheownerwithageneratorsetenclosure completeineverydetailandrequiringnoadditional in-fieldmodifications orassembly, except where specificallyallowedby these specifications.The enclosureis to be accurately dimensioned soastobeincompliancewiththeNationalElectricalCode (NEC), and the National Fire Protection Association (NFPA) for clearance of all specifieditems includedtherein,and all applicablefire codesfor a structureand applicationofthistype.
B.Constructiondrawings,engineeringblueprints,orotherbiddocumentsaccompanying thesespecificationswhichshow switchgear, transferswitch(es),motorcontroller(s) and/orotherserviceordistributionequipmentwithinthegeneratorsetenclosuremust beconsideredcomplimentary toandnotinlieuofthiswrittenspecification.Drawings submittedforapprovalshallreflectthisfactclearlyandanycontradiction oromission shallbebroughttotheattentionof thedesigningengineerpriortoorder.
PART2–PACKAGEDGENERATORSET ENCLOSURE
2.01 WALLPANELS
A.TheweatherproofenclosureshallbeofformedG90 galvanizedsteel panelconstruction asdesigned andmanufactured byProfessional PowerProducts.Theenclosureshall containagalvanizedperforated liningontheinteriorofthewallpanelstocoverthe insulationandsoundabsorption materials.Theenclosure istoberatedforawindload of120MPH(150 MPHoptional)and50lbs./sqft roofload.Thebasicstructuremeetsall seismicrequirementsofZone4orequivalent.Thedesignandconstruction shallbe modularin thatthepanelsshallnotexceed36”inwidthandshallbeminimumthickness of0.1046”,12GA.Bolttogetherwallpanelsshallbepowdercoated(spray coatnot accepted) andshallhavegasketing betweeneachverticalseam. Allexterior componentsoftheenclosureshallbe assembledutilizingcorrosionresistantsteelbolts, nutsandlockwashers.Allseamsshallbesealedtopreventleaks.Theroofshallbe bolttogetherinconstruction soastoallownomorethantwomentoremoveindividual sectionstofacilitatelargecomponentremovalfrom aboveifneeded.
2.02 ROOF
A. Raintestequalto4 inches/hour.
B. The roofoftheenclosureshallmatch theminimumgaugerequirementsspecifiedforthe wallspreviouslybut,inaddition, shallbestrengthened insuchamannerastosupport thelargestcommercially availableexhaustsilencerrecommended bytheengine manufacturerforthisapplication.
C.Theroofshallbebolttogetherinconstruction soastoallownomorethantwomento removeindividualsectionstofacilitatelargecomponent removal fromaboveifneeded. Bolttogetherdesignandconstruction shallutilizeanexternalperimeterguttertodirect rainwaterwaytobothendsof theenclosureandawayfromalldoorsandlouvers.
2.03 DOORS
A. Doorsshallnotexceed36”inwidthanddoorskinshallbeaminimumof12gauge
construction.
B.Alldoorsontheenclosureshallbestrategicallylocatedinareasastoalloweaseof maintenanceon the generator set and allow sufficient access to and visibility of instruments, controls,enginegauges,etc.Thedoorsshallbefittedwithaheavyduty, fullheight,continuous gearhingeconcealedbetweenthedoorleafanddoorframe.No exterior hinges will be allowed. The hinge shall be made of corrosion resistant aluminumandshallutilizeNylonbearingsforlongevity.
A.Thedoorshallhavea3pointlatchingmechanismformaximumsealingtoframe gasketing. EachdoorshallbefittedwithpadlockableStainlessSteelhandles. The handle hardware shallallowescape fromwithinwhenlockedexternally byuseofan emergencyegress lever.Door holdopen hardwareshallbeprovidedtosecurethedoor totheenclosurewall,whenfullyopen,duringinstallationandmaintenance. Ifexterior wall mounted componentscanbedamaged fromfullopendoorswing,doorrestraint chainsshallbeprovidedtolimitthe doorrotationto110degrees.Alldoorsshallbefully gasketedtopreventleaks.Rainguards/gutters shallbeprovided aboveeachdoorand extend6”beyondthedooropening oneachside. Rainguards/gutters willbeshipped looseforonsiteinstallationtopreventpossibleshippingdamageduringtransit.
2.04 SOUNDATTENUATION
A.Adhered Foam insulation shall not be used in any situation. If a specific sound attenuationlevelisrequired,enclosure manufacture mustprovidesoundlevel calculations thattheoverallsoundlevelcanbemet(byOctavebandifrequired).The calculations shouldincludecertified soundtestreportsofwallpanelandsoundbaffling construction.
2.05 THERMALINSULATION
A.Theenclosure istobethermallyinsulated with gasketeddoors.Insulationmaterialisto befiberglassheldinplacewitha galvanizedperforatedmetalliner.Insulationshallhave nolessthanaR19rating.
2.06 AIRINTAKE
A.Alllouversshallbedesignedtohelpprevent theentranceofdriving rainwater,butshall havesufficientfreeareatoallowforengine-generatorcoolingairrequirements.
2.07 MOTORIZEDLOUVERS
A.Airintakeandexhaustlouversshallbeofaluminumorgalvanizedconstruction.The louversshallopenautomaticallyupondieselgeneratorstartandcloseupondiesel
generatorshutdown.Heavy-dutyscreensovertheintakelouversshallbeprovided. Motorizedintakelouversshallbe120VAC.Exhaustlouversshallgravitytype.
2.07 EXHAUSTSILENCER
A.Internal silencer shall be mounted by the packager according to manufacturer’s recommendations. Externalsilencershallbemountedatthejob-sitebytheinstalling contractorwhen the silencer is loose-shippeddue to height restrictionsin transit. Externalsilencersshallbepre-mountedandfitatthefactory beforeshipment.The silencershallbemountedsuchthatitsweightisnotsupported bytheenginenorwill exhaustsystemgrowthduetothermal expansionbeimposed ontheengine.Exhaust pipesizesshallbesufficienttoensurethatexhaustbackpressure doesnotexceedthe maximum limitations specified by the engine manufacturer. All interior piping and interiorexhaust partsshallbeprovidedwithanexhaust blankettoprotectusersfrom possibleburnhazards.
2.08 TAILPIPE
A.Eachsilencershallbefittedwitha90°tailpipeextension(elbow)terminatingina vertical position and, to prevent the entrance of rainwater, shall be fitted with a weighted,raincap.
2.09 RAINSKIRT
A.Atthepointwheretheexhaustpipepenetratestheroofoftheenclosure,a suitable“rain skirt”andcollarshallbeprovidedbythepackager. Itshallbedesignedtopreventthe entranceofrainyetallowforexpansion andvibration oftheexhaustpipingwithout chafingorstresstotheexhaustsystem.
2.10 WALKAROUNDPROVISIONS
B. MaintainallNEC-requiredworkingspaces,clearancesandaccess.Anaisle,atleast
24”wide,shallbeprovidedoneachsideofthegeneratorsetandanextra36”behind
thegeneratorsetshallbeincludedwherepossible.
2.11 OILRADIATORDRAINS
A.Allnecessaryfittings,hoses,shut-offvalves,etc.,shallbeprovidedbythepackagerto facilitatelubeoilandradiatordrainingthroughoneofthemandoorsoftheenclosure.In addition,enginesequippedwithcrankcasebreathertubesshallhavethis tubeterminate throughtheradiatorplenum.
2.12 ENCLOSUREFLOORING
A.Theflooroftheenclosureshallbedesignedandconstructedinsuchamannerasto prevent the entrance of rodents. This shall be accomplished with solid metal or “diamondplate”but,inanyevent, mustbecapableoffullysupporting anyancillary equipment specifiedwhichmay besecuredtoitplustheanticipatedweightof maintenancepersonnelandtheirtools.
2.13 SKIDBASEMOUNTING
A.Thegenerator setandenclosure shallbemountedandshippedtothecustomeronthe structuralsteelskidbasemanufacturedbythepackager.Provisionsfor craneunloading of thecompletepackageshallbedesignedintothebaseof theunit.
2.14 WEIGHT
A.Theweightoftheentireunitconsistingofgeneratorset,base,enclosureandother specifieditemsincludingshallbecalculated bythepackagerutilizingmanufacturer’s data.Thebaseoftheunitshallbedesignedand manufacturedasaheavyduty, structuralsteelconstructionwithliftingprovisionstosupportthecalculatedweight.
2.15 BASETANK
A.FuelOilStorage:Provideasub-basefueltankforthegeneratorsetofsufficientcapacity torun thegenerator foraminimumof10-hours.The sub-basefueltank shallbeUL142 listed and labeled. Installationshallbe incompliance toNFPA37. The siderailsofthe beamsmustbesandblastedtoaSSPC-5.“Tapetests”mustbemaintainedtoguarantee thequality ofthesandblastprocess. 3-5milpaintthicknessmustbeapplied totheentire base. The fuel tank shallbeadouble-walled,steelconstruction and include the following features:
1. Lockable FillCap
2. Emergencytankand basin vents.
3. Mechanicallevelgauge.
4.Fuelsupplyandreturnlines,connectedtogeneratorsetwithflexiblefuellinesas recommended by the engine manufacturer and in compliance to UL2200 and
NFPA37 requirements.
5.Leakdetectionprovisions,wiredtothegeneratorsetcontrolforlocalandremote alarmindication.
6. Lowlevelfloatswitchestoindicatefuellevel. Wireswitchestogeneratorcontrol
forlocaland remote indication of fuellevel.
7. Removable liftingprovisions
8.Aonepiecerainweldedrainskirtshallbeprovidedbetweenthetopofthebase tankand the enclosure wallpanels.
2.16 CONTAINMENTBASIN:
A. Theunitshallbeequippedwithafuelcontainmentbasinwithanormalcapacityof
110%ofthemainfueltankandshallbesuppliedwithaleakagedetectorswitchinthe basinandwiredto anindicatinglightonthegeneratorcontrolpanel.
2.17 PAINT
A.Thebasetankshallbepowdercoatedorprimepaintedwithaminimumoftwo(2)coats ofrust-inhibiting primerandfinishedwithaminimumoftwo(2)coatsofpolyurethane. Thebasetankshallbepowdercoatedorwetpaintedtomatchcolorof theenclosure.
2.18 LOWFUELINDICATOR
A.Thefueltankshallbefittedwithalowfuellevelalarm,whichshallbewiredtoan indicating lightonthegenerator controlpanelofthegenerator set.Thisswitchshall activatewheneverthefuellevelinthetank is 40%orlessremaining.
2.19 HIGHFUELINDICATOR
A.Thefueltankshallbefittedwithahighfuellevelalarm,whichshallbewiredtoan indicating lightonthegenerator controlpanelofthegenerator set.Thisswitchshall activatewheneverthefuellevelinthetank is 100%ormoreremaining.
2.20 RUPTUREBASINLEAKINDICATOR
A.Thefueltankshallbefittedwitharupturebasinleakalarm,whichshallbewiredtoan indicating lightonthegenerator controlpanelofthegenerator set.Thisswitchshall activatewheneverthefuellevelintherupturetank is 5%ormoreremaining.
2.21 INTERNALWIRING
A.Allwiringwithintheenclosureshallbeinconduitsmadefromrigidmetal,EMT,or liquid-tightmaterialspecifically manufacturedforelectricaluse.Allconnectionsatthe generatorsetshallbeflexible.Toavoidexcessiveconduitrunningthroughout the enclosure, awireraceway shallbeusedforallACandDCwiring.EMTConduitruns shallbeprovidedwhereneededsuchasdeparturesfrom thewire way.
2.22 LOADCENTER
A.Theenclosureshallbeequippedwith aSqD100amp120/208-volt3phase4wire load centerforthebatterycharger,jacketwaterheater(s),lighting,receptacles, etc.,as specified andasshownonthedrawings. Theloadcentershallbemountedwithinthe enclosureandallowforasingleentrypointforcommercial powersupply conduitand wiringbytheinstalling contractor.Theplacement ofthisloadcentershallbeshownon thesubmittaldrawings.All internalconduitandwiringto thevariousancillaryequipment suppliedwiththepackageandshallbepre-wiredbythepackagerin accordancewithall governingcodespursuanttothisapplication.Theloadcentershallbeconsideredas partoftheemergencyloadand shallderiveitspowersourcedownstreamfromtheload transferswitchspecifiedelsewhere.Ifastep-downtransformerisrequired,tobeplaced aheadofthisloadcenter,ittogetherwithaproperly sizedprotectivedeviceshallbe suppliedandinstalledbythepackagerwithintheenclosure.
2.23 INTERIORFLUORESCENTLIGHTING:(AC)
A.Two-tube, F32T8 fluorescent lights shall be installed within the enclosure and strategically locatedoneithersideofthegeneratorset.Theyshallbeceilingmounted andparalleltothelengthoftheunit.TheirACpowersourceshallbetakenfromthe
commercialpower supply at the job-site and wired-in by way of the load center specifiedelsewhere.Thelightswitchbox,locatedbyoneoftheentranceway doors, shallhave itsown-groundedduplexreceptaclemountedthereinforusebymaintenance personnel.
2.24 EXTERIORLIGHTING
A.Theenclosureshallbeequippedwitha70WHPSlightontheexteriorofthebuilding aboveeachdoor,wiredintothecommercial powersupplyloadcenter,andactivated automaticallybywayofaphotoelectriccellwhichwillswitch thelightonduring evening hoursandoffduring daylight hours.The fixtureforthelightshallbeofvandal-proof design,mountedaboveoneof thesidedoors.
2.25 EMERGENCYLIGHTING
A.Theenclosureshallbeequippedwith(2)dualheademergencylightswithbattery backuppowersupply,meetingUL924,NFPA101andOSHAilluminationstandards.
2.26 EXHAUSTFAN
A. Theenclosureis tobefitted witha 120-voltshuttermountedexhaustfanwithcontrol
2.27 SPACEHEATER
A.Theenclosureistobefittedwith(2)5kW,240V,singlephasespaceheaterscomplete witha thermostat.
2.28 CLEARANCE
A.Thebaseandenclosureassemblyshallallowroomwithinthepackagetomountand maintainthe specifiedbatterycharger,enginestartingbatteries,racksand cables,main linecircuitbreaker,engine-generator controlpanel,andotheritemsasspecifiedoras shownonthedrawings.
2.29 BATTERYTRAY
A. AbatterytrayshallbeprovidedforthebatteriesandshallconformtoNEC480-7 (b).Itshallbeconstructed andsotreatedastoberesistanttodeteriorationby batteryelectrolyte.Further,constructionshallbesuchthatany spillageorboil-over ofbatteryelectrolyte shallbecontainedwithinthetraytopreventadirectpathto ground.A separatetrayshallbeprovidedforeachbatterybankandplacedoneach sideoftheengineonalldualstartermotorequippedunits.
2.30 BATTERYCHARGER
A. A currentlimiting,automaticDCbatterychargershallbefurnishedto automatically re-chargethebatteries.
2.31 FIREDETECTIONANDSUPPRESSIONSYSTEMS
A. Availablefiresuppressionsystemoptionsaremicromist,CO2,orFE-227.
1. AMicromistfiresuppressionsystemshallbedesignedinaccordancewithNFPA
750. Itshallhave awater tankandnitrogencylinderthatareproperlysizedforthe enclosure. Thesystemshallhavethenecessary numberofweatherproof strobe/hornunits,manualpullstations,dischargenozzlesandheatdetectors.
2.ACO2firesuppressionsystemshallbedesigned inaccordancewithNFPA-12. It shallhave aCO2tankproperlysizedfortheenclosure. Thesystem shallhave the necessary numberofweatherproof strobe/horn units,manualpullstations, dischargenozzlesandthermaldetectors. ThesystemshallalsohaveUV/IR detectorsifrequired.
3. AFE-227firesuppressionsystemshallbedesignedinaccordancewithNFPA-
2001. Itshallhave aFE-227cylinderproperlysizedfortheenclosure. Thesystem shallhavethenecessarynumberofhorns,strobes,manualpullstations,discharge nozzles,IR detectorsandthermaldetectors.
2.32 GASDETECTIONSYSTEMS:
a. Providegas detectionsystemifrequired.
2.33 REMOTEEMERGENCYSTOP SWITCH
A.The enclosure shall be equipped with exterior emergency breakglass stations to shutdownthegenerator. Aminimumof2arerequired,oneperside. Nameplateof eachbreakglassstationtoread“EMERGENCYSTOPOFGENERATOR”.
2.34 STRIPHEATER
A.Thermostaticallycontrolledunitarranged tomaintainstatorwindingabovedewpointto preventanti-condensation.
2.35 JACKETWATERHEATER
A.Onejacketwaterheater9,000W,208volt,singlephase,withthermostaticcontroland oilpressuredisconnectswitchtomaintainengineatconstanttemperatureof90°Fto
120°F. Jacketwaterheatershallbefurnishedwithballvalveshut-offsattheinletand outletandfactorywiredrelaystodisconnectpowerduringengineoperation.
2.36 WIRINGANDCONNECTORS:
A.All conduits, wire, cables, interconnections,etc., entering or exiting the generator enclosureshallbefurnishedandinstalledbytheinstallingcontractor.Allwiring shallbe inconduitssizedinaccordance withtheNEC.Allpowerandcontrolwiringshallbe THHN/THWNcopper,installedforacompleteandoperatingsystem.
2.37 GENERATOROVERCURRENTANDFAULT PROTECTION:
A.GeneratorCircuitBreaker: Moldedor Insulatedcasecase,LSItrip,100%rated, complyingwithUL489
(1) 24VDCSHUNTTRIP:Connectedtotripbreakerupongeneratorshutdownby otherprotectivedevices.
(2) AUXILLIARY SWITCHES: 2A/2B aux contacts for customer use for remote breakerstatusmonitoring.
(3) BELLALARM: 1formCcontactforcustomerusetomonitorcircuitbreaker
“Tripped”status
B.GroundFaultIndication: ComplywithNFPA,“EmergensySystem”signalsforground- fault. AfromCdrycontactwillbeprovidedtoallowcustomerannunciationupona groundfaultcondition. GroundfaultalarmmoduletobeWOKAGFA300modelor approvedequal.
PART3- EXECUTION
3.01 LOADBANKTESTING
A. Provide load bank testing. The load bank will be capable of definite and precise incrementalloadingand shallnotbedependentonthegeneratorcontrolinstrumentationto readamperage,voltage,orfrequency.Rather,thetestinstrumentationwillserveasa checkofthegeneratorsetmeters.Further,the load bankshallbe power factor matchedto theratingofthegeneratorsetasshowninthemanufacturer’s publisheddataandas specifiedforthisproject.
3.02 WARRANTY
A.Equipmentfurnishedunder thisSectionshallbeguaranteedagainstdefectivepartsand workmanshipunderthetermsandconditionsofthemanufactureranddealers standard warranty.But,innoeventshallitbeforaperiodoflessthanoneyearfromdateof initialstart-upof thesystemandshallincludelaborandtraveltimefornecessaryrepairs atthejob-site.Submittal start-up datareceivedwithoutwrittenwarrantiesasspecified willberejectedin theirentirety.
ENDOFSECTION