Calculated Industries ElectriCalc Pro User's Guide Page 1

USER’SGUIDEELECTRICALC®PROMODEL5060ELECTRICALC® PROM–R/CCONSTRUCTION MASTER®M+AC+/–πDC ResWire Resmilli– EqGrnd D/R SizeInsTripSEFuseStarterCond TypeM

8 — ElectriCalc Pro[Set] [3] — Three-Phase (3Ø)Sets calculator to three-phase mode.Displays: 3Ø.[Set] [2] — Ambient Temperature (Amb°)Permanently ente

User’s Guide — 9[Set] [5] — Free Air (FrAir)Sets calculator into Free Air mode,which refers to NEC Table 310-17 forwire size calculations. Displays: F

10 — ElectriCalc Pro[Amps] — AmpsEnters or calculates amps (using voltsand VA or watts). Displays: AMPS,KAMP or mAMP.[Volts] — VoltsEnters or calculat

User’s Guide — 11[HPth] — Horsepower (Theoretical)Enters or calculates theoretical horse-power (based on Amps, VA, watts, efficiency%, PF%, and/or vol

12 — ElectriCalc Pro[Set] [8] — Induction/ Synchronous Motor ToggleToggles between induction and syn-chronous motor types. Displays: SYNC(synchronous)

User’s Guide — 13♦First PressIf a wire length has been entered, thefirst press will show the larger of theampacity or voltage drop derived wiresize. T

14 — ElectriCalc Pro[ParSz] — Parallel SizeUsed to find the size of parallel conduc-tors using amperage and an enteredquantity of wires. Parallel wire

User’s Guide — 15♦First PressCalculates the derated wire size, if youhave entered the number of wires, forexample, 4 [Set] [ParSz]). Displays: D/R WIR

16 — ElectriCalc Pro[VD%] — Percent Voltage DropUsed to enter or calculate voltage drop.The default voltage drop is 3%. If wiresize or wire length val

User’s Guide — 17Ground Function Keys[Grnd] — GroundAn output-only key used to find thegrounding electrode conductor size forAC systems based on NEC T

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18 — ElectriCalc Pro[Set] [Grnd] — Equipment Ground (EqGrnd)This function uses NEC Table 250-122to compute the minimum equipmentgrounding conductor si

User’s Guide — 19Fuse/Breaker KeysThe ElectriCalc Prohas special keysthat automatically calculate the Amp ratings of the following over-current protec

20 — ElectriCalc Pro♦First PressDisplays the current motor type. Notethere is no motor type in single-phasemode.♦Second PressIn three-phase mode only,

User’s Guide — 21♦Second PressDisplays the full-load current percentmultiplier value used to determine fusesize. Subsequent presses repeat thiscycle.

22 — ElectriCalc Pro[O-Load] — Overload Protection♦First PressDisplays the overload amperage re-quirement based on the full-load cur-rent shown on the

User’s Guide — 23Conduit Sizing KeysThe ElectriCalc Procalculates conduitsize using NEC Tables 1, 3, 4, and 5 ofChapter 9 (given insulation type, wire

24 — ElectriCalc Pro♦Third PressShows total cross-sectional area of allentered wires of the selected wire insu-lation. Displays:TTL WIRE AREA.[CondSz]

User’s Guide — 25♦Third PressShows fill percentage for the calculatedconduit size as determined by Table 1,Chapter 9. Displays: COND FILL %.♦Fourth Pr

26 — ElectriCalc ProPreference SettingsYour calculator has the following Pref-erence Settings that you can accessand change at any time. Reach the Pre

User’s Guide — 27Default SettingsWhen you first receive your calculator, it is pre-set to the default settings listedbelow. You can always return you

User’s Guide — 1Introducing theElectriCalc®ProNow NEC®-Updateable!The ElectriCalc®Prois an invaluablecalculator for today’s busy electrical profession

28 — ElectriCalc ProBasic Math OperationsThis calculator uses standard chaininglogic, which simply means that you enter your first value, the operator

User’s Guide — 29Memory FunctionsWhenever the [Stor] [0] (M+) keys arepressed, the displayed value will beadded to memory. A list of memory keystrokes

30 — ElectriCalc ProKerchoff’s LawThe ElectriCalc Proutilizes Kerchoff’sLaw in finding volts, amps, volt-amps,watts, horsepower (theoretical), effi-ci

User’s Guide — 31Finding Current LoadA building with 120/240 volt 1Ø servicehas the following loads:Range = 7,800 VA Heating = 15,100 VADryer = 5,100

32 — ElectriCalc ProFinding Volt-AmpsWhat is the VA rating for a 120 volt, 22amp, 1Ø circuit? What is the kVA rat-ing?Steps Keystrokes DisplayClear ca

User’s Guide — 33Finding WattageA 120 volt single-phase 45 amp electri-cal motor has an 87% power factor.What is its wattage?Steps Keystrokes DisplayC

34 — ElectriCalc ProMotor HorsepowerThe ElectriCalc Procan calculate the full load current (amps) of a motor,based on phase, voltage and motor(synchro

User’s Guide — 35Finding Single-Phase Full LoadCurrentA 2 HP induction motor operates on 230volt, single-phase power. What is the fullload current for

36 — ElectriCalc ProFinding Synchronous MotorHorsepowerA synchronous motor is defined as having a 27 amp load on a 240 volt, 3Øcircuit. What is its ho

User’s Guide — 37Wire Sizing Based on Insulation RatingWiring is being installed in a 240 volt,single-phase system rated at 30 kVA.What is the wire si

2 — ElectriCalc ProThe ElectriCalc Proinstantly solves forthe following:♦ Volts, Amps, Volt-Amps, Watts, kVA, kW, PF%, EFF%, and DCResistance♦ Copper

38 — ElectriCalc ProWire Sizing Basedon Ambient TemperatureFind the 90°C aluminum wire size needed to connect a 47,700 volt-ampload to a 240 volt, sin

User’s Guide — 39Wire Sizing Based on Material TypeFind the wire size for a 75°C copper wire carrying a 3Ø load of 265 amps.What is the equivalent alu

40 — ElectriCalc Pro(Cont’d)Steps Keystrokes DisplayReset calculator [Set] [x] [On/C] 0.Set free air mode [Set] [5] 3Ø 60 FrAir Cu 0.Enter amps 500 [

User’s Guide — 41Sizing Temperature-AdjustedDerated WiresA circuit was built with 90°C aluminumwire connecting a 47,650 volt-amp loadto a 240 volt, si

42 — ElectriCalc ProVoltage DropThe reduction in voltage between thepower source and the load can be de-termined by entering the phase, volts,amps, wi

User’s Guide — 43IMPORTANT NOTE ON VOLTAGE DROP CALCULATIONSThe ElectriCalc Procalculates voltagedrop and wire size using DC resistanceas defined by t

44 — ElectriCalc ProFinding Three-Phase Voltage DropA 20-amp three-phase load is being fedby a 230-volt source located 150 feetaway. The installation

User’s Guide — 45Finding Voltage Drop Wire SizeA 20-amp single-phase 208-volt load willbe located 175 feet away from thesource. Assuming a 3% allowabl

46 — ElectriCalc ProFinding Voltage Drop DistanceHow far from a single-phase 240-voltsource can you install a 15 amp loadusing 60°C #10 Al branch circ

User’s Guide — 47Finding Voltage DropResistanceWhat is the resistance of 85 feet of #290°C copper conductor?Steps Keystrokes DisplayReset calculator [

User’s Guide — 3Table of ContentsInstalling NEC Updates . . . . . . . . . . . . . .4Key Definitions . . . . . . . . . . . . . . . . . . .5Preference

48 — ElectriCalc ProGround Conductor Wire SizeYou can use single or multiple serviceentrance conductor(s) to find thegrounding electrode conductor for

User’s Guide — 49Equip. Grounding ConductorWire SizeThe [Set] [Grnd] keystroke can be used to find the grounding conductor size forraceways and “over-

50 — ElectriCalc ProFuse and Circuit Breaker SizeWhat is the computed dual element and single element fuse size for a 230volt, 3-phase, 50 HP inductio

User’s Guide — 51Starter SizeWhat NEMA size starter is required for a 575 volt, 3Ø, 20 HP induction motor?Steps Keystrokes DisplayReset calculator [On

52 — ElectriCalc ProConduit SizeThe ElectriCalc Procan calculate thesize of conduit required when runningsingle or multiple wires using the[CondSz] ke

User’s Guide — 53Finding Motor Branch-CircuitWire Size & Conduit Size —Same Wire Type & SizeWhat size THHN copper wire & RMCconduit are ne

54 — ElectriCalc ProNOTE: If a wire size has been calculated orstored, and the wire type/quantity is not defined,the calculator will assume 2 THHN wi

User’s Guide — 55Finding Number of Wires in Ex-isting Conduit — Same Size,Various TypesFind the maximum number of #10 THHN copper wires that can be pu

56 — ElectriCalc Prosectional area of wires, conduit size and actual fill area? (Use [THHN] forTHWN; the cross-sectional areas arethe same.)Steps Keys

User’s Guide — 57Error CodesThe error codes for the ElectriCalc Proare listed below (Note: To clear an error, simply press any key):Error Description1

4 — ElectriCalc ProInstalling NEC UpdatesYour ElectriCalc Prois now updateablefor future National Electrical Code®editions that are updated every thre

58 — ElectriCalc Pro2002 NEC ReferencesTable 250-66 Table 250-122Table 310-15(b)(2)(a)Table 310-16 Table 310-17Chapter 9, Table 1, 4, 5 and 8Section 4

User’s Guide — 59SettingsPermanent Values/SettingsValues and settings maintained in per-manent memory can only be changed(1) by pressing [Set] [x] (re

60 — ElectriCalc ProWarrantyWarranty Repair Service – U.S.A.Calculated Industries, Inc. (“CI”) war-rants this product against defects inmaterials and

User’s Guide — 61Please provide an explanation of theservice requirement, your name, ad-dress, day phone number and datedproof of purchase (typically

62 — ElectriCalc ProRepair Service – Outside the U.S.A.Not all countries have CI AuthorizedService Providers or the same warrantyand service policies.

User’s Guide — 63INCIDENTAL, OR CONSEQUENTIALDAMAGES RESULTING FROM ANYDEFECT IN THE PRODUCT OR ITSDOCUMENTATION.The warranty, disclaimer, and remedie

64 — ElectriCalc ProLegal NoticesSoftware copyrighted and licensed toCalculated Industries, Inc. by SpecialtyCalculator Technologies, LLC, 2002.User’s

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User’s Guide — 5Key DefinitionsStandard Calculator Functions[On/C] — On/ClearTurns on power. Pressing once clearsthe last entry and the display. Press

6 — ElectriCalc Pro[Set] — Second FunctionAccesses the secondary functionsshown above the keys when pressedprior to selection.[Stor] — StoreUsed to st

User’s Guide — 7[Stor] [0] — Cumulative Memory Adds displayed value to Memory (e.g.,10 [M+], 20 [M+], [Rcl] [M+] = 30).Clears when the calculator is s