Rain Bird WS-PRO LT User manual

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WS‐PROLTWeatherStation
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InstallationManual
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January 2012 GT27146
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WS-PRO LT weather station 1
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WSPROLTTableofContents
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1.0Installation ................................................................................................................ 2
1.1PowerSources ...................................................................................................................................... 2
1.2SiteSelection......................................................................................................................................... 2
1.3Grounding ............................................................................................................................................. 3
1.4WirelessCommunicationWeatherStation .......................................................................................... 3
1.4.1TransmissionsRanges ............................................................................................................ 3
1.4.2Line‐of‐Sight ........................................................................................................................... 3
1.4.3TestingRadioTransmissions.................................................................................................. 4
1.5DirectConnectWeatherStation ........................................................................................................... 4
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2.0QuickStartGuide....................................................................................................... 5
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2.1ComputerRequirements ...................................................................................................................... 5
2.2WeatherStationSetup ......................................................................................................................... 5
2.3WeatherStationConfiguration ............................................................................................................ 6
2.3VerifySerialCommunicationwithWeatherStation ............................................................................. 8
2.4RadioSetupforWirelessWeatherStations.......................................................................................... 9
2.5CommunicationWiringSetupforDirectConnectWeatherStations ................................................. 11
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3.0InstallationProcedure .............................................................................................. 13
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4.0SolarPanelInstallation............................................................................................. 15
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AppendixA–GroundingRecommendations................................................................... 16
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A.1.0GroundingSystemInstallation ........................................................................................................ 16
A.1.1GroundResistance............................................................................................................... 16
A.1.2InstallationRequirement..................................................................................................... 16
A.1.3groundRodStacking............................................................................................................ 17
A.2GroundingSystemDesigns ................................................................................................................. 18
A.2.1Design“Y” ............................................................................................................................ 18
A.2.2Design“Y”(Alternate).......................................................................................................... 19
A.2.3GroundingPlateDesign ....................................................................................................... 20
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2 WS-PRO LT weather station
1.0 Installation
ThismanualcoverstheprocedureforinstallingyourWSPROLTweatherstation,forbothdirect
connectandwirelesscommunicationandforsolarandDCpoweredoptions.Beforeinstallingthe
weatherstation(s)atyoursite,readoverthediscussionsofpowersources,siteselection,grounding,
wirelesscommunicationanddirectconnectweatherstations.
2.1 Power Sources
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Weatherstationshaveaninternalsealedrechargeablebatterythatmustberechargedto
assurecontinuedsystemfunction.Forrechargingthebattery,asolarpanelorausersupplied
externalDCpowersourcethathasanominalratingof18Vat1ampoutputisrequired.
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2.2 Site Selction
Theidealsiteisrepresentativeofthegeneralarea,islevel,andwellawayfrom
obstructionssuchasbuildings,trees,andsteepslopes.Ifobstructionsexist,usetheTen
TimestheHeightRule,whichisillustratedinFigure1.
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FIGURE1TenTimestheHeight Rule . 
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WS-PRO LT weather station 3
Forexample,iftheheightofthetreeTis8feetandtheheightoftheshedHis7feet,install
theweatherstationatleast80ftawayfromthetree(e.g.,10T=10x8=80ft)and70ftaway
fromtheshed(e.g.,10H=10x7=70ft).
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Donotplacetheweatherstationnearasprinklerwhereitislikelytobesprayedbywater,
asthiswillchangetherainreportedbyweatherstation.
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Note:Ifyourweatherstationwillbeinsideafencetodiscouragevandalism,thefencetop
mustbelowerthanthewindsensorsevenifthefenceischain‐link.
2.3 Grounding
Outdoorcablesmaybesubjecttoinducedcurrentsduetolightningorother
environmentalfactors.Therefore,propergroundingisimperativetoavoiddamageto
theweatherstationand/ortheHostcomputer.PleaseseeAppendixAforgrounding
recommendations.
2.4 Wireless Communication Weather Station
1.4.1 TransmissionsRanges
Wirelesscommunicationweatherstationsareavailableforinstallationswithinseveral
ranges.Typicaltransmissionrangesarelistedbelow:
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•Upto½mile(0.8km)fortheweatherstation916MHzandweatherstation
922MHz
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•Upto1/4mile(0.4km)fortheweatherstation2.40GHzofthecentral
controlcomputer.
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•Upto7milesifanoptionalhighergainantennaisinstalledonboththe
weatherstationandtheRFXXXBaseStation
1.4.2 Line‐of‐Sight
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Thisrangeassumesnoobstructionsareintheline‐of‐sight.Line‐of‐sightisdefinedas
astraightpathbetweenatransmittingandreceivingantennathatisunobstructedby
intermediatetopographyorobstructions.Aclearline‐of‐sightisrequiredtoachieve
theoptimumtransmissionrange.Theaffectofobstructionsonthetransmissionrange
canvary.Therefore,ifobstructionsliewithintheline‐of‐sight,youshouldtestyour
radiotransmissionsbeforepermanentlyinstallingyourweatherstation.

4 WS-PRO LT weather station
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FIGURE2Line‐of‐sightexamples.Asthedottedlineindicates,Station1hasaclearline‐of‐sightwiththe
ComputerSite.ThemountainobstructsStation2’sline‐of‐sightandwouldreduceorpossiblyprevent
wirelesscommunications.
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Wirelessweatherstationsareequippedwithspreadspectrumradiosandincludea
secondspreadspectrumradiothatisinstalledatthecentralcontrolcomputer.
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1.4.3 TestingRadioTransmissions
Totesttheradiotransmissionofyourweatherstationcarrytheweatherstationto
thesitethenattempttocommunicatewiththecentralcontrolcomputer.If
obstructionsinthelineofsightarepreventingtheweatherstationfrom
communicating,trythefollowing:
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•Relocateyourweatherstationawayfromobstructions
•Removetheobstructions
•Mountthecomputerbasestationantennaoutsideofthebuildingby
runningtheantennacablethroughawindoworcablerun
•Useahighergainantenna(optional)attheweatherstationsite
•Installahighergainantenna(optional)ontheroofofthecomputerbase
stationbuildingandalignitabovetheobstructions.
2.5 Direct Connect Weather Station
Directconnectweatherstationsareavailableforinstallationsthatrequiretheweather
stationbeplacedmorethana½milelineofsightfromthecentralcontrolcomputer.
Withtheuseofshorthaulmodems,theweatherstationcanbeinstalledupto2.4miles
awayusinga24AWGcable.
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Note:DCE/DTEswitchesonthemodemsaresettoDCEatthecentralcontrolcomputer
andDTEattheweatherstation.

WS-PRO LT weather station 5
2.0 QuickStartGuide
2.1 Computer Requirements
•Cirrus,NimbusII,StratusII,orStratusLTcentralcontrolsystemwithAutomaticETand
MultipleWeatherStationmodules.ModulesareoptionalwithNimbusIIandStratusII
centralcontrolsystems.
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Note:TheMultipleWeatherStationsmoduleisonlyrequiredifmultipleweather
stationswillbeconnectedtoonecentralcontrolsystem.
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•Windows98/2000/XP,orWindows7OperatingSystem
•AvailableSerialPort/COMPort
2.2 Weather Station Setup
1. Removethetopfoampackingfromtheboxandverifyyouhaveallorderedequipment
(seeEquipmentList).ReportmissingordamagedequipmenttoyourlocalRainBird
distributorbeforeinstallingyoursystem.
Equipment List
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ModelsDirect
Connect
Direct 
Connect
Solar
Powered
Wireless
Wireless
Solar
Powered
Wireless 
2.4 GHz 
Solar 
Powered 
1.WSPROLTWeatherStation X  X  X  X  X 
2.
RS‐232,serial
communicationscable(9‐
pinto9‐pin)
X  X  X  X  X 
3.Twokeys X  X  X  X  X 
4.RF401‐seriesSpread
SpectrumRadio
X  X 
5.RF416‐seriesSpread
SpectrumRadio
X 
6.Antenna X  X X(whip)
7.RFXXXACAdapter X  X  X 
8.SolarPanel X  X  X 
9.SolarPanelMounting
Hardware
X  X  X 
10.RADModemforcomputer X  X 
11.RADmodem(inwhite
box)forweatherstation
X  X 

6 WS-PRO LT weather station
12.
Cableforconnection
betweenweatherstation
andRADmodemat
weatherstation
X  X 
13.
Cableforconnection
betweenRADmodemat
weatherstationandMSP‐1
(9720)
X  X 
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2. Usetheliftstrapstoremovetheweatherstation,sinceremovingthestationbylifting
onthesensorsmaydamagethesensors(seeFigure3)
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FIGURE3Lift Straps 
Note:Avoidrestingtheweatherstationonthewindspeedandwinddirectionsensors
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3. Connecttheserialcable(maleconnector)totheweatherstation’sRS‐232port.Be
suretoremovedustcoverfromtheweatherstationRS‐232portbeforeconnecting
thecable.
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4. Connecttheserialcable(femaleconnector)tocomputerserialCOMport
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5. Connectpowertotheweatherstation(e.g.solarpower,usersuppliedDCpower)
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6. TurnthekeytotheONposition.
2.3 Weather Station Configuration
1. RequestAutomaticETandMultipleWeatherStationsmodulekeycodesfromGlobal
ServicePlan(GSP)orfromyourlocalRainBirddistributor.

2. StartRainBirdcentralcontrolsoftware(e.g.Cirrus,NimbusIIorStratusII)

WS-PRO LT weather station 7
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3. EnteryourkeycodebyclickingontheSoftwareModulesOptionsbuttonandentering
thekeycode(s)inthecorrespondingbox(seeFigure4)
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FIGURE4KeycodeDialog Box 
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4. ClickApplybutton
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5. ClickClosebutton
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6. ClickonToday’sET/WeatherDatabutton
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7. ClickonWeatherStationConfigurationbutton
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8. Selectweatherstationfromdropdownmenu(see
Figure5)
FIGURE5WeatherStationConfigurations
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9. SelectStationTypeRainBirdTurf‐CR200
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10. Enterlatitudeandelevationwhereweatherstationwillbeinstalled
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11. AssignportbyclickingonTestandSetPort(seeFigure6)
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Figure6TestandSet Port
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12. Selectweatherstation
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13. SelectCOMPort(assigntoavailableCOMport)

8 WS-PRO LT weather station
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14. ClickAssignbutton
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15. ClickOKbutton
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16. Enterdownloadtime
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17. Repeatsteps8‐16for2nd,3rd,…,5thweatherstations
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18. ClickOKwhenyouhavecompletethesetup
2.4 Verify Serial Communication with Weather Station
1. ClickonWeatherProgrambutton

2. Note:ToaccessWeatherProgramfrommainmenu,firstselectToday’sET/WeatherData
button
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3. ClickonMonitorCurrentDatabutton

4. Monitorthesensordisplays.Withinacoupleofminutes,numericalvaluesshouldappearon
thescreenandindicatorlightsonthebottomoftheweatherstation,labeledScan/Receive,will
blinkeverytenseconds,confirmingcommunicationbetweentheweatherstationandthe
computer.
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5. SynchronizetheweatherstationtimetothecomputertimebyclickingonSynchronizeWSTime
6. button
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7. Closethemonitoringwindow
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8. Disconnecttheserialcablefromtheweatherstationandplacethedustcoverbackontheserial
port.
9. ContinuewithRadioSetupforWirelessWeatherStationorfordirectconnectweather
stations,refertoCommunicationWiring…instructions.
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WS-PRO LT weather station 9
2.5 Radio Setup for Wireless Weather Station
1. AttachantennatotheradioconnectorlabeledAntenna
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FIGURE7Theradioantennamaybeasurfacemountantenna(left),awhipantenna(right)thatconnectsdirectly
totheradio,orotheroptionalantennas(notshown).

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FIGURE8TheconnectormarkedAntennaonanRFXXX‐seriesradioiswheretheantennasattach.
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2. ConnecttheserialcablemaleconnectortotheradioconnectorlabeledRS‐232

10 WS-PRO LT weather station
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FIGURE9Radioconnections.Theserialcable(left)connectstothe
portmarkedRS232andtheACadapterconnectstotheportmarked
DCPWRinput.

3. ConnecttheserialcablefemaleconnectortoacomputerserialCOMport

4. PlugtheRF401ACadaptertotheRF401connectorlabeledDCPWRinput
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5. PlugtheotherendoftheRF401ACadapterintoagroundedACwalloutlet.Thered
PWR/Txstatuslightshouldilluminate

6. ClickonWeatherProgrambutton

Note:ToaccessWeatherProgramfrommainmenu,firstselectToday’sET/WeatherDatabutton

7. ClickonMonitorCurrentDatabutton
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8. Monitorthesensordisplays.Withinacoupleofminutes,numericalvaluesshouldappearon
thescreenandindicatorlightsonthebottomoftheweatherstation,labeledScan/Receive,
willblinkeverytenseconds,confirmingcommunicationbetweentheweatherstationandthe
computer.

9. Iftheradioisnotcommunicatingproperly,youmaybeexperiencinginterferencefrom
nearbyequipmentsuchaswirelessphones,otherspreadspectrumradios,oranother
weatherstation.Changethelocationoftheweatherstation.

10. Ifyourradioisworkingproperly,closetheweathersoftwareandturnthekeytotheoff
position.Youarenowreadytoinstallyourweatherstationatasitewithin½milefromthe
centralcomputer.
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WS PRO LT weather station 11
2.6 Communication Wiring Setup for Direct Connect Weather Stations
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1.FurnishandinstallaBelden#9883DirectBurialType,communicationcable
betweentheweatherstationandthecentralcontrolcomputer(nottoexceed
20,000ft./3.8mileswiththespecified20AWGBelden#9883cable).

Note:TheBeldencableshouldconsistofthree(3)twistedpairsofwires(20gauge),
abarecopperdrainwireandanaluminumshield.Thethree(3)twistedpairsshall
becolorcodedasfollows:one(1)blackandgreenpair,one(1)blackandredpair,
andone(1)blackandwhitepair.Theblackandwhitepairshallnotbeused,but
keptasasparepair.

Attheweatherstation…

2.ConnecttheBlack(‐xmt)andGreen(+xmt)pairofwires(ofthecommunicationcable)tothe
BlackandRedwiresrespectivelyonthe“Field”endofthefirstMSP‐1.

3.ConnecttheBlackandRedwiresonthe“Equipment”endofthefirstMSP‐1totheWhite
(‐xmt)andGreen(+xmt)wiresofthecable(9720)furnishedwiththeweatherstation.

4.ConnecttheRed(+rcv)andBlack(‐rcv)pairofwires(ofthecommunicationcable)totheRed
andBlackwiresrespectivelyonthe“Field”endofthesecondMSP‐1.

5. ConnecttheRedandBlackwiresonthe“Equipment”endofthesecondMSP‐1totheRed
(+rcv)andBlack(‐rcv)wiresofthecable(9720)furnishedwiththeweatherstation.


CommunicationWire
fromCentral
CommunicationWireat
WeatherStation



Black(‐xmt)
Green(+xmt)
Red(+rcv)
Black(‐rcv)

Black
Red
Red
Black
FIELD





FIELD

MSP‐1




MSP‐1


EQUIP
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


EQUIP
Black
Red
Red
Black
White(‐xmt)
Green(+xmt)
Red(+rcv)
Black(‐rcv)

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FIGURE10Communicationwiringatweatherstation
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12 WS-PRO LT weather station
6. GroundthebarecopperdrainwireoftheBeldencablealongwiththegreenground
wiresofbothMSP‐1surgepipestothegroundingrodusingabrassgroundwireclamp.

Note:Donotgroundthedrainwireatthecentralendofthecable.Leaveitunused.

7.LeavetheBlackandWhitepairofwiresasspares

8.Connecttheotherendofthecable(9720)totheComputerconnectiononthewhitebox
(containingRADmodem).

9.ConnecttheRS232endofthesecondcable(9721)totheRS232portoftheweatherstation.

10.Connecttheotherendofthecable(9721)totheWXStationconnectiononthewhitebox.

11.InstallthewhiteboxjustbelowtheweatherstationusingfurnishedUbolt.

Atthecomputer…
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12. FurnishandinstallaBelden#9883orequivalent,directburialtype,communicationcable
betweentheRADmodeminstallednearthecentralcontrolcomputerandtheaccessboxatthe
centralvalveboxlocation.Specificationsofthiscablearelistedearlierinsection2.5.
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13. ConnecttheBLACK(‐XMT)&GREEN(+XMT)pairoftheBelden#9883cablecomingfromthe
weatherstationtotheBLACK&REDwiresrespectively,atthe“FIELD”endofoneoftheMSP‐1
surgearrestors.TheBLACK(‐XMT)&GREEN(+XMT)wiresoftheBelden#9883communication
cablegoingtotheRADmodeminstallednearthecentralcomputershallbeconnectedtothe
BLACK&REDwiresrespectively,atthe“EQUIPMENT”endofthesameMSP‐1surgearrestor.

14. TheRED(+RCV)&BLACK(‐RCV)pairoftheBelden#9883cablecomingfromtheweather
stationshallbeconnectedtotheRED&BLACKwiresrespectively,atthe“FIELD”endofthe
otherMSP‐1surgearrestor.TheRED(+RCV)&BLACK(‐RCV)wiresoftheBelden#9883
communicationcablegoingtotheRADmodemshallbeconnectedtotheRED&BLACKwires
respectively,atthe“EQUIPMENT”endofthesameMSP‐1surgearrestor.
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15. Connecttheblack(‐xmt)wiretothe(‐xmt)portoftheRadmodemfurnishedwiththeweather
stationkit.Useasmallscrewdrivertoopenthehole,insertthewireandthentightenwiththe
screwdriver.

16. Continuewiththegreen(+xmt),red(+rcv)andblack(‐rcv)wiresrespectively.
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17. ConnecttheRADmodemtoaCOMportonyourcomputer(itmightbenecessarytousea9to
25pinconnector).
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WS PRO LT weather station 13
3.0 InstallationProcedure
1. Mountamast/pole1.25”ODand8to10feet(312cm)highoncementbase.
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2. Placeyourweatherstationassemblyontopofthemast/polewiththebasefirmlyseatedon
thetopedgeofthemast/poleof(seeFigure11)
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FIGURE11 Installation at Pole
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3. LooselytightentheU‐boltnutssothattheweatherstationisstablebutcanberotatedonthe
mast/pole.
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FIGURE12U‐Bolt Nuts
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4. Asareference,useacompassandrotatetheweatherstationassemblyuntilthereferenceline
onthewinddirectionsensorisalignedwiththeMagneticNorth(seeFigure13).
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14 WS-PRO LT weather station
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N
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
N 

FIGURE13WindDirectionAlignment
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5. FirmlytightentheU‐Boltnuts
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6. Confirmtheweatherstationislevelbyviewingthebull’slevelontopoftheweatherstation
(seeFigure 14).Minoradjustmentscanbemadebyplacingshimsbetweentheweatherstation
baseandthetopofthepole.









Bull’slevel 
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FIGURE14Bull'sLevelontopoftheweatherstation
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7. Connectthepowersourcethatwillrechargetheinternalsealedrechargeablebattery.For
SolarPoweredweatherstationsfollowinstructionsbelow.

8. Removetheredcapfromthesolarradiationsensor(Figure15).



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FIGURE15Solar Radiation 
Sensor
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9. Properlygroundtheweatherstationbyconnectinga#10gaugeorlargerwiretotheearth
groundluglocatedonthebaseoftheweatherstation.ReferAppendixA
forgrounding 
recommendations.

10. Refertosection2.5CommunicationWiringfordirectconnectweatherstations.

WS PRO LT weather station 15
11. TurnthekeytotheONpositionandreturntothecomputersitetoconfirmtheweather
stationisworkingproperly.

4.0 SolarPanelInstallation
Thesolarpanelrechargestheweatherstationinternalbattery.Ithasa72sq.inchsurfacearea
andproduces5watts,atapeakof17.1volts.


 
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FIGURE165WSolar Panel 
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1. Placethesolarpanelonthemastbelowthestationtothemaximumdistanceallowed
bythesolarpanelcable.

2. LooselytightentheU‐boltsothatthesolarpanelisstablebutcanberotatedonthemastor
pole.

3. Useacompasstoproperlyalignthesolarpanel.Ifyoursiteisinthenorthernhemisphere,
theglasssurfaceofthepanelshouldfacesouth.Ifyoursiteisinthesouthernhemisphere,
theglasssurfaceofthepanelshouldfacenorth.

4. ConnectthecabletotheweatherstationconnectorlabeledSolarPanel

5. TightenthethumbscrewandtheU‐bolt
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16 WS-PRO LT weather station
AppendixA–GroundingRecommendations
A.1 Grounding System Installation

Topreventlightningdamagetoyourequipment,RainBirdrecommendsinstallingagrounding
systemfortheequipment(includingcontrollers,weatherstations,andcentralcontrolsystems).
Thegroundingsystemdischargeslightning‐inducedelectricalcurrentintotheearthratherthan
allowthesurgetopassthroughpowerwiresorfieldwirestoyourequipment’selectronic
components.

A.1.1 GroundResistance

Groundresistanceoccurswhengroundingsystemcomponents,orthesoilitself,oppose
theflowofelectricityintotheearth.Groundresistanceismeasuredinunitscalled
“ohms”(Ω).Thehigherthegroundresistance(higherohmreadings),thelesschancethe
surgewillbeshuntedtogroundratherthantotheequipment’selectroniccomponents.

FigureA.1‐1showspointswheregroundingsystemscandevelopresistance.Todecrease
groundresistance,RainBirdrecommendsirrigatingthesoilaroundthegrounding
system.Eachgroundingsystemshouldhaveadedicatedirrigationzonewithsprinkler
headsanditsownwateringprogramtomaintainsoilmoisturearoundthegrounding
system.

Aproperlyinstalledgroundingsystemshouldmaintainamaximumgroundresistanceof
10ohms,orless.Ifyouareunabletoreacharesistanceof10ohmsorless,youcan
decreaseresistancebysurroundingthegroundingrodsorplateswithground
enhancementmaterial,suchasPOWERSETfromPaigeElectricCorporation(P/N
1820058),orGEMfromERICO(P/NGEM‐25A).

Ifgroundresistancestillmeasureshigherthan10ohms,youcanextendthegroundrod
lengthasdescribedin“GroundRodStacking,”oruseadditionalgroundingrods,as
showningroundingsystemdesign“Y”(Alternate).

A.1.2 InstallationRequirement
Thefollowingrequirementsapplytoallgroundingsystemdesigns(designYandthe
“GroundingPlate”design).Allgroundingrodsorplatesmustbeconnectedtogether
belowgradewith#6AWGorlargersolidbarecopperwire.
Installtheconnectingwireinasstraightalineaspossible.Ifyoumustmakeaturnor
bendinthewire,maketheturninasweepingcurvewithaminimumradiusofeight
inchesandaminimumincludedangleof90o.

WS PRO LT weather station 17
Tominimizeresistance,thecopperwiremustbepre‐weldedtothegrounding
rods/plates,orweldedtotherods/platesusinganexothermicweldingprocessatthe
site.
Makesureallweldsaresecurebeforeburyingthegroundingrods.Rodsandplateswith
weldedjointsdonotneedperiodicvisualinspectionandcanbefullyburied(novalve
boxrequired).Measurethegroundresistancearoundthegroundingsystemafter
installation,andonceeveryyearafterthat.

Note:Thegroundwirefromtheequipmenttothegroundingsystemshould
beasshortaspossibleandhavenobends,kinks,orcoilsinthewire.

Inspectthegroundingsystem’sclampedconnectionstotheequipment(notthewelded
groundingsystemconnections)onceayeartomakesuretheyaresecureandcorrosion‐
free. 
FIGUREA.1‐1Groundingsystemscandevelopresistanceatmanypoints\


A.1.3 GroundRodStacking

Threadedcouplers(showninFigureA.1‐2)aregroundrodsplices.Ifasinglegrounding
rodfailstoproduce10‐ohmgroundresistance(maximum),threadedcouplerscanbe
usedto“stack”groundingrods.

Note:Usethreadedcouplersmadeofthesamematerialasyourgroundingrods.

Stackinggroundrodsincreasesthetotaleffectiverodlength,decreasingground
resistance.Joiningtherodstogetherwiththreadedcouplersformsasecureconnection
sothegroundingrodscanbeassembledquicklyandeasily.

18 WS-PRO LT weather station

FIGUREA.1‐2Stackinggroundingsrodswiththreadedcouplerscanhelpdecreasegroundresistance

A.2 Grounding System Designs
A.2.1 Design“Y”

Design“Y”Design“Y”(showninFiguresA.2‐1andA.2‐2)consistsofthree,
5/8”‐diameterx8‐foot‐long,copper‐cladgroundingrods.Installtherodsinaradial1200
star(“Y”)configuration.Eachrodmustbeinstalledinatrueverticalposition,atleast16feet
fromtheequipment

Note:Allgroundingsystemdiagramsarenottoexactscale

FIGUREA.2‐1Design“Y”usesthreegroundingsrodsimnstalledinradial120degress“Y‐shaped”configuration

WS PRO LT weather station 19

FIGUREA.2‐2Groundingsystem“Ycanbeinstalledasshown,orwithgroundenchancementmaterialtoreducegroundresistance
evenfurther.
A.2.2 Design“Y”(Alternate)

Analternatedesign“Y”(showninFiguresA.2‐3andA.2‐4)usesthreeradialsina120
degreestar(“Y”)arrangement.Eachradialconsistsofthree,5/8”‐diameterx8‐footlong
copper‐cladgroundingrods.Thefirstrodineachradialmustbeatleasteightfeetfrom
theequipment.Therestoftherodsmustbeatleast16feetfromanyotherrod.

FIGUREA.2‐3Desing“Y”(Altrenate)usesninecopper‐cladgroundingrodsinstalledina120degreestarconfiguration