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NewsletterMay2007ElectricalSystemsRulesofThumb
XCELEnergyLightingRebates
EnergyComplianceforCommercial
Buildings
LEEDInnovationinDesignPoints
PlugIntotoIndustryEvents
ElectricalSystemsRulesofThumb
Daylighting
ELECTRICALSYSTEMSRULESOFTHUMB:
1.ElectricalRoomRequirements
a.
Onlargerfacilities,themainroomtypicallyneedstwodoors,oneateachendofroom(notdoubledoorsatonelocation).
b. Doorsmustopeninthedirectionofegressfromtheroom.c.
Doorsmusthavepanichardware.d.
RatedConstruction:Itisnottypicalthatthisroomberequiredtohavea1hour
rating.Iftheelectricalengineerneedsalargetransformer(atransformerwitharatingover112.5KVA)inthisroom,theyshouldnotifytheArchitectthattheroomwillberequiredtohavea1hourratingduetotheNationalElectricalCoderequirements.
2.ElectricalRoomSizingforTypicalFacilities(recreationcenters,multifamily,generalcommercial)
SizeofFacility
MainElecRoom RemoteElecRoomsRqd?
RemoteElecRoomSize Notes
020,000sf,onelevel
10x20 Typicallynot N/A (1)
20,00040,000sfmultilevels
15x20 Oneonmainlevelandoneper20,000sfonupperlevel(s)
8x10each (1)
+40,000sf 15x20 Oneachlevel,oneper20,000sfandspace200apart
8x10each (1)
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(1)Additionalremoteelectricalroomsshouldbeconsideredforbuildingswithdistinctspacelayoutswhichmaybenefitfromadditionallocalizeddistributionequipment.(i.e.Anindividualwingofbuildingthatisseparatedfromthemainbuildingbymultistoryopenatrium).
3.ExteriorServiceTransformer(notethatallspecificelectricalutilitytransformerrequirementsaretobecoordinatedwiththelocalutilityengineerfortheprojectasmostutilitycompaniesvarytheirrequirements)
a. Lessexpensiveiftransformerislocatednearelectricalroom.b.
Formediumtolargefacilitiesanticipate8x8padsize.c.
Provide36cleararoundthreesides,and12ofclearanceonfrontside.d.
Typicallydriveupaccessisrequiredfortheutilitycompany.e.
Itisdesirabletolocatetheelectricalroomonanexteriorwall,nearthefinal
utilitytransformerlocation.
4.Phone/dataRooms
a.
Typicallyatleastoneperlevelofanybuildingtype.Cablecanberouted300fromdevicetoroom,soadditionalroomswouldberequiredforbuildingslongerthan300inanydirection.
b.
RoomsizesvarybasedupontheITdepartmentsneeds,butanticipate10x10formaintelephoneroomsand6x6forremoterooms.
5.Wallsthroughoutthefacilitycontainingrecessedelectricalpanelboardsshouldbeaminimumof6deep.
LIGHTINGSYSTEMSRULESOFTHUMB:
1.Lightingis30%oftheoverallbuildingpowerusage.Savingsintheoverallwatts/sfusedforlightingcanhaveasignificantimpact.
2.Typical2x4lightingfixturespacingis8x10.
3.Wallmountedlightingfixturescanonlybemountedbelow68iftheyproject4orlessfromthewall.
4.Atypicalbuildingwillendupwithanoveralllightingloadof1.01.5wattspersquarefoot.
5.Energyefficiencyoftypicallamps
a.
One32wattfluorescentT8hastheequivalentlightoutputtothree60wattincandescentALamps(thestandardhouseholdscrewinlamp)ortwo60watthalogenMR16lamps.
b.
FluorescentHighOutputT5similarefficiencytotheT8fluorescentbutitssmallersizecanleadtomoreefficientfixturedesign.
c. MetalHalideisapproximately15%lessefficientthanfluorescent.d.
LEDactuallyhasaverylowlightoutputperwatt.Itsoverallenergyefficiencyis
similartostandardhalogen,farlessthanfluorescentlamps.ThereasonLEDtechnologyissaidtobesoefficientisbecauseitdirectsmostofthelightinonedirectionsoitisgoodforsigns,stoplights,wayfinders,andotherdirectionallighting,butnotnecessarilyefficientforoverallroomillumination.
6.Typicallamplife
a. FluorescentT820,000hours,or3yearsat18hours/dayb.
FluorescentHighOutputT520,000hours,or3yearsat18hours/dayc.
MetalHalide20,000hours,or3yearsat18hours/dayd.
IncandescentALamp750hours,or2monthsat18hours/day
e.
IncandescentMR16Halogen10,000hours(withspeciallamp),or11/2years
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at18hours/dayf. LED100,000hours,or+15yearsat18hours/day
7.Tohelpwithpreliminarysitebudgetcosts,beforeanengineermaybeinvolvedonaproject,thetypicalspacingofpolelightsinaparkinglotisapproximately100oncenterwithananticipatedinstalledcostfornondecorativepolesof$2,000each.Decorativepoleswilltypicallybeapproximately$3,000installed.
8.DuetotheadoptionoftheInternationalBuildingCodes,compliancewiththeInternationalEnergyConservationCodeisalsotypicallyrequired.Uponsubmissionofthe100%CDdrawingstothebuildingdepartment,itshouldbeanticipatedthatstampedcopiesofthecomplianceformsbesubmittedbytheelectricalandmechanicalengineers.
DownloadElectricalSystemsRulesofThumbprintablesheetforreference.
DownloadLightingSystemsRulesofThumbprintablesheetforreference.
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