Manual Calculadora UG5065E-B

ELECTRICALC ® PRONEC® COMPLIANT

UPDATEABLE ELECTRICAL CODE CALCULATOR

Model 5065

User’s Guide

The ElectriCalc® Pro is an invaluable calculator for today’s busy electrical professional. Unlike a regular calculator, ithas intuitively labeled “electrical keys” andconforms to the 2008 (and 2005, 2002,1999, 1996) and future National ElectricalCodes, allowing you to solve Code-relat-ed problems quickly and accurately. Themost common NEC tables are now atyour fingertips!

An important feature of the ElectriCalc Prois that it is programmed to accept futureNEC changes, allowing you to convenient-ly install future Code editions in a few sim-ple steps.

Introducing the

ElectriCalc® ProNow NEC®-Updateable!

The ElectriCalc Pro instantly solves forthe following:

• Kirchhoff’s Law• Ohm’s Law• Volts, Amps, Volt-Amps, Watts, kVA,

kW, PF%, EFF%, and Resistance• Copper or Aluminum Wire Sizes• Parallel and Derated Wire Sizes• Voltage Drop Wire Sizes, % and

Actual Voltage Drops, Voltage Drop Distances and Wire Resis-tances

• Kilowatt hours and BTU’s• Parallel Resistance• Grounding Conductors Sizes• Motor Full-Load Amps• Overload Protection Sizes• NEMA Starter Sizes• Conduit Sizes• And much more!

Table of ContentsKey Definitions . . . . . . . . . . . . . . . . . . . .1Preference Settings . . . . . . . . . . . . . . . .21Default Settings . . . . . . . . . . . . . . . . . .22Basic Math Operations . . . . . . . . . . . . . .23Percent Calculations . . . . . . . . . . . . . . .23Memory Operations . . . . . . . . . . . . . . . .24Kirchhoff’s Law . . . . . . . . . . . . . . . . . . .26Ohm’s Law . . . . . . . . . . . . . . . . . . . . . .29Motor Horsepower . . . . . . . . . . . . . . . .31Ampacity Wire Sizing . . . . . . . . . . . . . .34Voltage Drop . . . . . . . . . . . . . . . . . . . .41Ground Conductor Wire Size . . . . . . . . . .47Equipment Grounding Conductor Wire Size . .48Fuse and Circuit Breaker Size . . . . . . . . .49Starter Size . . . . . . . . . . . . . . . . . . . . .49Overload Protection Size . . . . . . . . . . . .50Conduit Size . . . . . . . . . . . . . . . . . . . . .51Converting KW-HR and BTU . . . . . . . . . .56Parallel Resistance . . . . . . . . . . . . . . . .57Error Codes . . . . . . . . . . . . . . . . . . . . .58Battery Information . . . . . . . . . . . . . . . .582008 NEC References . . . . . . . . . . . . . .59Updating Future Code Revisions . . . . . . .60Settings . . . . . . . . . . . . . . . . . . . . . . . .60Repair and Return . . . . . . . . . . . . . . . . .61Warranty . . . . . . . . . . . . . . . . . . . . . . .62FCC Class B . . . . . . . . . . . . . . . . . . . . .65Legal Notices . . . . . . . . . . . . . . . . . . . .65

Your ElectriCalc Pro is now updateablefor future National Electrical Code®

editions that are updated every three (3) years. To upgrade your unit, followthe instructions below:

1) Purchase the NEC Update from CI(see pricing / details from CI’s Website: www.calculated.com or call 1-800-854-8075). This Update is in theform of a chip that contains the newCode.

2) Once you receive the NEC Updatechip, you need to install it in yourElectriCalc Pro:

a)Turn calculator off.

b)As a precaution, remove the bat-tery (located back of calculator, topof unit) by sliding battery door outwith your thumbnail. Set aside.

c) Using a screwdriver, pop out thesquare tab located in the middle sec-tion on the back of your calculator.

d)Replace it with the new update tabby inserting it into the slot.

e)Replace the battery door.

f) Turn calculator on. Your calculatoris now updated and ready to use.

User’s Guide — 1

Standard Calculator Functionso — On/ClearTurns on power. Pressing once clearsthe last entry and the display. Pressingtwice clears all non-permanent values.

O — OffTurns all power off. Clears the Memoryand most internal registers.

+ - x ÷ =Arithmetic operation keys.

0 1 2 3 4 5 6 7 8 9 •Used for keying in numbers.

% — PercentFour function (+,-,x,÷) Percent key.

S v — Reciprocal (1/x)Finds the reciprocal of a number (e.g.,8 S v 0.125).

B — Back Space FunctionUsed to delete entries one keystroke ata time (unlike the o function, whichdeletes the entire entry).

S — Second FunctionUsed with other keys to access second-ary functions.

s — StoreUsed with function keys to store values.Displays: STOR

Key Definitions

2 — ElectriCalc Pro

r — RecallRecalls a value stored in a register (e.g.,to recall voltage drop % press r v).Displays: RCL

S + — Pi (π)Constant = 3.1415927

S - — Change Sign (+/–)Toggles the sign of the displayed valuefrom positive to negative or from nega-tive to positive.

S % — x2

Squares the displayed value.

S B — Square Root ( )Square Root function.

s 0 — Cumulative Memory (M+)Adds displayed value to Memory (e.g.,1 0 s 0, 2 0 s 0, r 0 =30). To subtract from Memory, you mustadd a negative value to the cumulativeMemory (e.g.,1 0 s 0, 5 S -,s 0, r 0 = 5). Clears when thecalculator is shut off.

r 0 — Memory RecallDisplays the value saved in (M+).

r r — Display/Clear Memory (M-R/C)Displays and clears the value saved in(M+).

S r — Clear MemoryClears the value saved in (M+) withoutchanging displayed value.


s 1 - 9 — Memory StorageWhen pressed after the s key, the 1through 9 keys will store the displayedvalues into non-cumulative Memory.

r 1 - 9 Recall M1 – M9.

Mode Set-up FunctionsS x — Clear AllClears all values, including Memory.Resets settings to default values, exceptpreference settings which are retained.

S ÷ — Preferences (Prefs)Use to set default settings or modes(see “Preference Settings”).

S 1 — Single-Phase (1Ø)Sets calculator to single-phase mode.Displays: 1Ø

S 3 — Three-Phase (3Ø)Sets calculator to three-phase mode.This is the default setting. Displays: 3Ø

S 2 — Ambient Temperature (AMB°)Permanently enters ambient tempera-ture for determining ampacity derivedwire sizes. Ambient temperature willonly change when entering a new valueor by resetting the calculator. Defaults to30°C (86°F). Amb will display when theambient temperature is other than 30°C(86°F). Displays: AMB°

(Cont’d)


(Cont’d)

NOTE: The temperature units can bedisplayed in Celsius (°C) or Fahrenheit(°F) by changing the preference setting(see “Preference Settings”).

S 4 — Copper/Aluminum (Cu/Al)Used to toggle between copper (de-fault) and aluminum wire types. Whenthe wire type is revised, any calculatedwire size will be re-calculated automati-cally. If a wire size is entered with thewrong wire type, pressing S 4 willchange the material type without changing the size. Displays: Al or Cu

S 5 — Free Air (FrAir)Sets calculator into Free Air mode,which refers to NEC Table 310-17 forwire size calculations. Displays: FrAir

S 6 — 60°C Wire InsulationSets calculator to 60°C wire insulationtype for wire size calculations. This isthe default setting. Displays: 60

S 7 — 75°C Wire InsulationSets calculator to 75°C insulation typefor wire size calculations. Displays: 75

S 9 — 90°C Wire Insulation Sets calculator to 90°C insulation typefor wire size calculations. Displays: 90


Electrical Functions

K — kilo-This key is used with Watts, Amps, Volts, and Volt-amps keys to identify“kilo-” values.

S K — milli-This key sequence is used with Watts,Amps, Volts, and Volt-amps keys toidentify “milli-” values.

A — AmpsEnters or calculates Amps (using Voltsand VA or Watts). Displays: AMPS,KAMP or mAMP

U — VoltsEnters or calculates Volts (using Amps,HPth, and VA or Watts). Default value is240 Volts. Displays: VOLT, KV, or mV

V — Volt-AmpsEnters or calculates Volt-amps (usingAmps, Volts and Horsepower or Watts).Displays: VA, KVA, or mVA

W — WattsEnters or calculates Watts (using Amps,Volts, and VA or Horsepower).Displays: WATT, KW, or mW

S A — DC Amps (Idc)Enters or calculates DC Amps (using DCVolts and Resistance). Displays: Idc


S U — DC Volts (Vdc)Enters or calculates DC Volts (using DCAmps and Resistance). Displays: Vdc

S V — DC Resistance (R)Calculates and displays DC resistancein Ohms (using DC Volts and DC Amps).Displays: R

S W — Power Factor (PF%)Enters or calculates power factor per-centage (based on Watts and VA).Defaults to 100%. Entered or calculatedpower factors greater than 100% willresult in an error. Displays: PF%

H — Horsepower (Theoretical)Enters or calculates theoretical Horse-power (based on Amps, VA, Watts, efficiency%, PF%, and/or Volts). 1.0HPth correlates to 746 Watts at 100%efficiency. Displays: HPth

S H — Efficiency (Eff%)Enters or calculates the percent ratiobetween real power (Watts) and theoreti-cal Horsepower. Default: 100%. Enteredor calculated efficiencies greater than100% will result in an error. Displays: EFF%

S • — Kilowatt–Hours to BTU(Kw-hr � Btu) Calculate BTU (BritishThermal Unit) based on an enteredKilowatt-Hour value. Displays: KW-H


S = — BTU to Kilowatt–Hours(Btu � Kw-hr) Calculate Kilowatt-Hoursbased on an entered BTU (BritishThermal Unit) value. Displays: BTU

S s — Parallel Resistance (Par Res) Calculate total resistancebased on an entered series of resist-ance values. Displays: P-RS

Motor Horsepower Functions

The ElectriCalc Pro can be used to deter-mine motor full-load current (Amps)based on entries for motor Horsepower(HPmotor), Phase and Voltage.

You can also find an equivalent motorHorsepower if you have entered Voltageand full load current values. Only HPmotor and Voltage entries as defined byNEC Tables 430-247, 430-248 and 430-250 can be used to determine motorloads.

S 8 — Induction/Synchronous/DCMotor Toggle (Ind/Sync/DC)Toggles between induction, synchronous,and direct current motor types. Displays:IND (induction - default), SYNC (synchro-nous) or DC (direct current).

h — Motor Horsepower Enters or calculates motor Horsepower.Displays: IND HP (induction – default),SYNC HP (synchronous) or DC HP(direct current).


Ampacity TablesThe ElectriCalc Pro uses NEC Table310-16 (310-17 for Free Air) to find wiresizes and ampacity ratings of wires. The calculator uses the following data to calculate wire size: 1) insulation temperature rating (60°C, 75°C and90°C); 2) wire material (copper or aluminum); and 3) ambient temperature.Standard AWG wire sizes and CircularMils are used by the ElectriCalc Pro.Wire size entries less than or equal to2000 are accepted as AWG wire sizes;entries greater than 2000 are acceptedas Circular Mil entries and display thecorresponding AWG wire size. Entriesmust match the standard wire sizes orCircular Mils; otherwise, “nonE” will bedisplayed (Invalid entry).

NOTE: 1/0, 2/0, 3/0 and 4/0 wires areentered using the 0 key (e.g., 0, 00, 000 and 0000).

w — Wire Size/AmpacityEnters or calculates wire size based onampacity and Voltage drop, if a Voltagedrop length has been entered.

♦ First PressIf a wire length has been entered, thefirst press will show the larger of theampacity or voltage drop derived wiresize. The calculator will use the largervalue when calculations require a wiresize. If no Voltage drop length has beenentered, the calculator will display thecalculated ampacity rated wire size.


♦ Second PressIf a wire length has been entered, the sec-ond press displays the smaller of the twowire sizes. If not solving for Voltage dropwire size, then displays the maximumampacity.

♦ Third PressDisplays the wire size in Circular Mils.Displays: CMIL

♦ Fourth PressIf a wire length has been entered, displaysthe minimum wire ampacity rating. If nowire length has been entered, displays theNEC table referenced for the calculation.Displays: NEC 310.16

S w — 125% AmpacityUsed for motor wire sizing when the wiremust not exceed 80% of its rated ampacity(125%A). This keystroke calculates wiresize based on 125% of the entered or cal-culated Amps value. Displays: 125%

P — Parallel SizeUsed to find the size of parallel conductorsusing amperage and an entered quantity ofwires. Parallel wire size calculations small-er than 1/0 are displayed as “none” (displayshows “nonE”) as the NEC does not allowparallel wire runs smaller than 1/0.

♦ First PressWhen preceded by a number, calcu-lates the applicable wire size for thatquantity of wires in parallel. Displays: PAR WIRE SIZE

(Cont’d)


(Cont’d)

♦ Second PressDisplays the maximum adjusted ampacityof the calculated parallel wire size.Displays: WIRE A

NOTE: No adjustments are made forderation.

S P — Derated Wire Size (D/R Size)Used to calculate derated wire sizes and allowable ampacity based on theentered quantity of wires, NEC Table310-16 and NEC Table 310-15(b)(2)(a).Derated wire sizes are not calculatedwhen there are less than four wires, orwhen the unit is in Free Air mode.

♦ First PressCalculates the derated wire size, if youhave entered the number of wires, forexample, 4 S PDisplays: D/R WIRE SIZE

♦ Second PressDisplays the maximum adjusted am-pacity of the derated wire size. Displays: D/R WIRE A

♦ Third PressDisplays the derated adjustment factorper the NEC Table 310-15(b)(2)(a).Displays: ADJ %

♦ Fourth PressDisplays the NEC table referenced forthe calculation. Displays: NEC 310.15


Voltage Drop SolutionsThe ElectriCalc Pro will calculate maximum lengths, minimum wire sizesor actual voltage drops given the othertwo values. Voltage drop solutions arebased on the DC resistance valuesfound in NEC Chapter 9, Table 8.

NOTE: Voltage drop solutions may varyslightly from actual AC circuit values asthe calculator does not incorporate factors such as inductive reactance,skin effect, raceway material, etc.

v — Percent Voltage DropUsed to enter or calculate voltage drop.The default voltage drop is 3%. If wire sizeor wire length values are not available,“nonE” will display since the voltage dropcannot be found.

♦ First PressEnters a maximum allowable voltagedrop percentage (Displays: V DROP %) or calculates actual Voltage drop(Displays: V DROP).

♦ Second PressCalculates actual percent Voltage drop.Displays: V DROP %

l — LengthEnters or calculates the length of a runfor Voltage drop calculation. Displays: FEET or MET

NOTE: Units of length can be set to Feetor Meters by changing the preferencesetting (see “Preference Settings”).


S l — Wire Resistance (Wire Res)Displays the actual resistance per 1,000 feet of the wire size in wbased on NEC Chapter 9, Table 8. Displays: OHMS WIRE

Ground Function Keys

G — GroundAn output-only key used to find thegrounding electrode conductor size forAC systems based on NEC Table 250-66 and an entered or calculatedservice-entrance conductor (largestsize). Only actual wire sizes are con-sidered valid entries.

♦ First PressCalculates the copper grounding elec-trode conductor size if you have en-tered a valid wire size. Displays: GRND CU WIRE SIZE

♦ Second PressDisplays the aluminum grounding elec-trode conductor size. Displays: GRND AL WIRE SIZE

♦ Third PressDisplays the Circular Mil area used tocalculate the grounding electrode con-ductor size. Displays: CMIL WIRE


♦ Fourth PressDisplays the NEC table referenced forthe calculation. Displays: NEC 250.66

S G — Equipment Ground (EqGrnd)This function uses NEC Table 250-122to calculate the minimum equipmentgrounding conductor size, given anentered amperage rating or setting for aover-current device up line (e.g., 300S G).

NOTE: This function deviates from theNEC Table 250-122 in that 1250 MCMAL is used instead of 1200 as specifiedin NEC Table 250-122.

♦ First PressDisplays the copper grounding conduc-tor size for the entered Amp rating.Displays: EQPG WIRE SIZE CU

♦ Second PressDisplays the aluminum grounding conduc-tor size. Displays: EQPG WIRE SIZE AL

♦ Third PressDisplays the NEC table referenced forthe calculation. Displays: NEC 250.122


Fuse/Breaker Keys

The ElectriCalc Pro has special keysthat automatically calculate the Amp ratings of the following over-current protection devices: Dual Element Fuses(Time Delay), Single Element Fuses(Non-Time Delay), Instantaneous TripBreakers (Type 1), Inverse TimeBreakers (Type 2), and OverloadProtection Devices.

These fuse and circuit breaker sizes are derived using the “Percent of Full-Load Current” multipliers listed in NECTable 430-52.

You can also calculate the full Voltagestarter size for non-plugging and non-jogging duty motors based on phase,Voltage, motor HP and NEMA tablespecifications.

If a parameter is missing or invalid, thecalculator will display “nonE.”

S L — Motor Type (M-Type)Based on NEC Table 430-52, this keyselects the motor type used to define the percent factors for breakers/fuses.Once set, the motor type remains fixeduntil you change it or perform a Clear All(S x).

♦ First PressDisplays the current motor type. Notethere is no motor type in single-phasemode.


♦ Second PressIn three-phase mode only, subsequentpresses of L will select and display the next motor type from this list: SQ-C non-B (Squirrel Cage, non-Design B), SQ-C B (Squirrel Cage,Design B), SYNC no codE (Synchro-nous), WND no codE (Wound Rotor).

D — Dual Element Fuse

♦ First PressCalculates the minimum Amp rating for a Dual Element Fuse.Displays: AMPS dE.

♦ Second PressDisplays the full-load current percentmultiplier used to determine fuse size.Displays: %FLC

S D — Single Element Fuse(SEFuse)

♦ First PressDisplays the minimum Amp rating basedon Phase, motor type, and amperage.Displays: AMPS SE

♦ Second PressDisplays the full-load current percentmultiplier value used to determine fusesize. Subsequent presses repeat thiscycle. Displays: %FLC


S I — InstantaneousTrip Circuit Breaker (InsTrip)

♦ First Press Displays the minimum Amp rating for an Instantaneous Trip Circuit Breaker,based on the phase, motor type, andamperage. Displays: AMPS b1

♦ Second PressDisplays the full-load current percentmultiplier value used to determinebreaker size. Displays: %FLC

I — Inverse Time Breaker

♦ First PressCalculates the minimum Amp rating foran Inverse Time Breaker, based on thephase, motor type, and amperage.Displays: AMPS b2

♦ Second PressDisplays the full-load current percentmultiplier value used to determinebreaker size. Displays: %FLC

L — Overload Protection

♦ First PressDisplays the overload amperage require-ment based on the full-load current shownon the motor nameplate. Multiplies theentered motor nameplate full-load current(stored in the A registers) by 115% orthe value you enter.


Conforms to NEC Section 430-32 (a)(1)value of 115% unless you enter anothervalue. For example, entering 125 Lwould calculate overload protectionbased on 125% of the entered amperage. Displays: AMPS ol

♦ Second PressDisplays the full-load current percentmultiplier value used to determine theoverload current protection size. Sub-sequent presses of L repeat thecycle. Displays: %FLC

S h — Starter Size (Starter)Displays the starter size (from NEMApublication ICS 2-1988 Tables 2-327-1and 2-327-2) based on the phase, Volt-age, and motor Horsepower settings.Displays: STAR SIZE

NOTE: Horsepower values not identi-fied in NEMA tables will cause the cal-culator to round up to the next largerstarter size in the table.


Conduit Sizing Keys

The ElectriCalc Pro calculates conduitsize using NEC Tables 1, 3, 4, and 5 ofChapter 9 (given insulation type, wiresize, and quantity of wires). It will alsocalculate the number of wires of a specified insulation type and wire sizethat will fit in a defined conduit size.Acceptable conduit sizes (depending on the type of conduit used) are as follows: 1/2”, 3/4”, 1”, 1-1/4”, 1-1/2”, 2”,2-1/2”, 3”, 3-1/2”, 4”, 5”, and 6”. Conduitsizes are entered using decimal equiva-lents (e.g., 1-1/2” is entered as 1.5, 3/4”is entered as .75, etc.).

†, ≈, ∑ — Number of WiresUsed to enter or calculate the number of wires in a raceway and calculatecross-sectional wire area.

♦ First PressEnters number of wires or calculatesmaximum number of wires in conduit.Displays: TTL WIRES (calculated) orWIRES (entered).

♦ Second PressShows total cross-sectional area for allentered wires. Displays: WIRE AREA(entered) or TTL WIRE AREA (calculated).

♦ Third PressShows total cross-sectional area of allentered wires of the selected wire insu-lation. Displays: TTL WIRE AREA


C — Conduit SizeUsed to find conduit sizes based on thetotal area of the entered wire types andsizes (up to 15 at one time). If the quantity and insulation type has not been entered, the calculator will assume 2THHN wires for single-phase or 3 THHNwires for three-phase calculations.

♦ First PressEnters or calculates conduit size.Displays: COND SIZE

NOTE: If a wire size has not been en-tered or calculated, or an invalid con-duit size is entered, the calculator willdisplay “nonE.”

♦ Second PressShows total number of wires in the conduit for calculated conduit size.Shows the conduit internal area for anentered conduit. Displays: TTL WIRES(calculated) or COND AREA (entered).

NOTE: Third through fifth presses dis-play only for calculated conduit sizes.

♦ Third PressShows fill percentage for the calculatedconduit size as determined by Table 1,Chapter 9. Displays: COND FILL %

♦ Fourth PressShows the total wire area for all enteredwires. Displays: FILL TTL WIRE AREA

(Cont’d)


(Cont’d)

♦ Fifth PressShows remaining fill area. This valuemay be negative if all wires are thesame size due to Note 7 in NEC Chap-ter 9, Table 1. Displays: REM WIRE AREA

S C — Conduit Type (Cond Type)

♦ First PressDisplays the currently selected conduittype.

♦ Second PressSubsequent presses will display andselect the next conduit type from this list:

1) EMT2) ENT3) FMC 4) IMC 5) LFNB 6) LFNA7) LFMC 8) RMC 9) P-80

10) P-40 11) P-A12) P-EB

To select a specific conduit type, enterthe corresponding number of the con-duit and then press S C. If youpress this keystroke without entering anumber, the calculator will switch to thenext conduit type on the list.


Your calculator has the following Pref-erence Settings that you can access andchange at any time.

Access the Preference Settings bypressing S ÷. Then, to access each category, press the ÷ key until the desired setting is reached. Withineach category, press the + or - keys to toggle between individual selections(note: the + will advance, the - willback-up).

You can change these settings at anytime by repeating the above, and settingin a new preference.

NOTE: To return the Preferences to thedefault settings, perform a full reset (pressO, hold down x, and press o), ormanually set them back using the key-strokes below.

The Preference Settings are (defaultsettings shown first):

To Set 2008, 2005, 2002, 1999, or 1996NEC code:S ÷ (1st press of ÷) NEC 2008+ NEC 1996+ NEC 1999+ NEC 2002+ NEC 2005

Preference Settings


To Set Ambient Temp. to °C or °F:

÷ (2nd press of ÷) AMB° 30 °C+ AMB° 86 °F

To Set Length to Feet or Meter:

÷ (3rd press of ÷) FEET 1.+ MET 1.

When you first receive your calculator, it is pre-set to the default settings listedbelow. You can always return your calculator to these default values byperforming a Clear All (S x).

Ambient Temperature 30°CInsulation Rating 60°CMaterial Copper (Cu)Phase 3ØVolts 240 VEfficiency 100%Power Factor 100%Voltage Drop Percent 3%Wire Environment Raceway(vs Free Air)

Default Settings


This calculator uses standard chaininglogic, which simply means that you enter your first value, the operator (+,-, x, ÷), the second value and thenthe equals sign =.

A. 3 + 2 = 5.B. 3 - 2 = 1.C. 3 x 2 = 6.D. 3 ÷ 2 = 1.5

The Percent key % can be used for find-ing a given percentage of a number orfor working add-on, discount or divisionpercentage calculations.

3 5 5 x 1 5 % 53.252 5 0 + 6 • 5 % 266.252 5 - 5 % 23.751 0 0 ÷ 5 0 % 200.

The Percent key also allows you tochange percentages to decimals (e.g.,2 5 % 0.25).

Percent Calculations

Basic Math Operations


Whenever the s 0 keys are pressed,the displayed value will be added to theMemory. Other Memory functions:FUNCTION KEYSTROKES

Add to Memory s 0Subtract from Memory S - s 0Recall total in Memory r 0Display/Clear Memory r rClear Memory S r

Memory is semi-permanent, clearingonly when you:

1) turn off the calculator;2) press r r;3) press S r;4) press S x (Clear All).

When Memory is recalled (r 0), consecutive presses of r 0 will display the calculated average and totalcount of the accumulated values.

Using M+KEYSTROKES DISPLAY

3 5 5 s 0 M+ 355.2 5 5 s 0 M+ 255.7 4 5 S - s 0 M+ – 745.r 0 TTL – 135.r 0 AVG – 45.r 0 CNT 3.r r – 135.

M

M

M

M

M

M

Memory Operations


Using Memory Storage Keys (M1 - M9)

In addition to the standard cumulativeMemory (as previously described), yourcalculator has nine independent StorageRegisters – M1 through M9 – that canbe used to permanently store single,noncumulative values. The followingexample shows the use of M1 (s 1).To use M2 through M9, replace thepresses of the 1 key with presses ofthe corresponding number key (2through 9).

You can replace a value in one of theseMemory registers by storing a new valuein place of the stored value.

FUNCTION KEYSTROKES

Store single value in M1 s 1Clear M1 0 s 1Recall M1 r 1

Examples:

Store 175 into M1, recall the value, andthen clear the value.

KEYSTROKES DISPLAY

1 7 5 s 1 M-1 175.O o 0.r 1 M-1 175.0 s 1 M-1 0.


The ElectriCalc Pro utilizes Kirchhoff’sLaw in finding Volts, Amps, Volt-amps,Watts, Horsepower (theoretical), effi-ciency and power factor.

Finding VoltageFind the Voltage supply to a single-phase load drawing 14,605 Volt-ampsand 115 Amps.Steps Keystrokes DisplayClear calculator o o 0.Set to 1-phase S 1 1 PHEnter VA 1 4 6 0 5 V

VA 14,605.Enter Amps 1 1 5 A AMPS 115.Solve for Volts U VOLT 127.

Finding AmpsWhat is the current (Amps) for a loaddrawing 8,250 Volt-Amps on a 240 Volt,three-phase circuit?Steps Keystrokes DisplayClear calculator o o 0.Set to 3-phase S 3 3 PHEnter VA 8 2 5 0 V VA 8,250.Enter Volts 2 4 0 U VOLT 240. Solve for Amps A AMPS 19.846416

Kirchhoff’s Law


Finding Current LoadA building with 120/240 Volt 1Ø servicehas the following loads:

Range = 7,800 VA Heating = 15,100 VADryer = 5,100 VA Appliances = 8,900 VALighting = 6,470 VA

What is the service load (Amps) of thecircuit supplying this building?

Steps Keystrokes DisplayClear calculator o o 0.Set to 1-phase S 1 1 PHAdd VA loads: 7 8 0 0 +

1 5 1 0 0 +5 1 0 0 +8 9 0 0 +6 4 7 0 = 43,370.

Enter as VA V VA 43,370. Enter Volts 2 4 0 U VOLT 240. Solve for Amps A AMPS 180.70833

Finding Amps from KilowattsWhat is the amperage for a 75 kW loadconnected in a 120/208 Volt, 3Ø circuit?

Steps Keystrokes DisplayClear calculator o o 0.Set to 3-phase S 3 3 PHEnter kilowatts 7 5 K W KW 75.Enter Volts 2 0 8 U VOLT 208. Solve for Amps A AMPS 208.17918


Finding Volt-AmpsWhat is the VA rating for a 120 Volt, 22Amp, 1Ø circuit? What is the kVA rating?

Steps Keystrokes DisplayClear calculator o o 0.Set to 1-phase S 1 1 PHEnter Volts 1 2 0 U VOLT 120. Enter Amps 2 2 A AMPS 22. Solve Volt-amps V VA 2,640. Solve for kVA K V KVA 2.64

Finding kVA RatingWhat is the kVA rating for a 120/208Volt, three-phase, 65 Amp transformer?

Steps Keystrokes DisplayClear calculator o o 0.Set to 3-phase S 3 3 PHEnter Volts 2 0 8 U VOLT 208.Enter Amps 6 5 A AMPS 65. Solve for kVA K V KVA 23.417327

Finding WattageA 120 Volt, single-phase, 45 Amp electri-cal motor has an 87% power factor.What is its wattage?

Steps Keystrokes DisplayClear calculator o o 0.Set to 1-phase S 1 1 PHEnter Volts 1 2 0 U VOLT 120. Set power factor 8 7 S W PF% 87. Enter Amps 4 5 A AMPS 45. Solve for Watts W WATT 4,698.


Finding kW RatingWhat’s the kW rating for a 90 Amp, 208Volt, three-phase broiler with 100%power factor?

Steps Keystrokes DisplayClear calculator o o 0.Set to 3-phase S 3 3 PHSet power factor 1 0 0 S W

PF%100.Enter Amps 9 0 A AMPS 90. Enter Volts 2 0 8 U VOLT 208. Solve for kW K W KW 32.423991

The ElectriCalc Pro’s built-in Ohm’s Lawfunctions allow you to easily solve forVoltage (Volts), current (Amps), or resist-ance (Ohms) by entering in any two vari-ables (e.g, Volts and Amps) and solvingfor the third (e.g., Ohms).

Ohm’s Law: V = I x R

The Ohm’s Law functions on theElectriCalc Pro are identified as follows:

• Vdc = Voltage, in Volts• Idc = current, in Amps• R = resistance, in Ohms

Ohm’s Law


Finding VoltsThe current in a circuit is 0.0125 Amps,and the total resistance is 480 Ohms.Find the Voltage.Steps Keystrokes DisplayClear calculator o o 0.Enter current • 0 1 2 5 S A

Idc 0.0125 AEnter resistance 4 8 0 S V

OHMS 480. Find Voltage S U Vdc 6. V

Finding AmpsAn 120k electrical resistor is plugged intoa 12 volt circuit. Find the current (in Amps).Steps Keystrokes DisplayClear calculator o o 0.Enter resistance 1 2 0 K S V

KOHM 120.Enter Voltage 1 2 S U Vdc 12. VFind current S A Idc 0.0001 A

Finding OhmsAn electrical circuit operating at 240 Voltshas a current of 14.6 Amperes. Find thetotal resistance (in Ohms) of the circuit.Steps Keystrokes DisplayClear calculator o o 0.Enter Voltage 2 4 0 S U

Vdc 240. VEnter current 1 4 • 6 S A

Idc 14.6 AFind resistance S V OHMS 16.438356


The ElectriCalc Pro can calculate the full load current (Amps) of a motor,based on phase, Voltage and motor(synchronous, induction, or DC). It uses NEC Tables 430-247, 430-248 and 430-250 to determine the motor full loadcurrent. (If you enter a value for HP orVoltage that does not correspond tothese tables, the unit will display nonE).

The ElectriCalc Pro can also calculatean equivalent Horsepower for an induc-tion, synchronous or direct current motorbased on a Voltage, phase and full loadcurrent. When calculating motor HP froman entered amperage, a result not directly matching a value in NEC Table430-247, 430-248 or 430-250 will causethe calculator to choose the next highertable value for motor Horsepower.

Finding Single-Phase Full LoadCurrentA 2 HP induction motor operates on 230Volt, single-phase power. What is the fullload current for this motor?

Steps Keystrokes DisplayClear calculator o o 0.Set to 1-phase S 1 1 PHEnter Volts 2 3 0 U VOLT 230.Enter HP 2 h IND 2. HP Find full load Amps A FLC 12. A

Motor Horsepower


Finding Motor Wire Size andAmpacityFind the wire size required to connect acontinuous run, 3Ø, 3 HP induction motorinto a 230V circuit.

Steps Keystrokes DisplayClear calculator o o 0.Set to 3-phase S 3 3 PHEnter Volts 2 3 0 U VOLT 230. Enter HP 3 h IND 3. HP Find load current A FLC 9.6 AFind 125% A size S w AWG 14 CU

WIRE SIZE 125%Find max ampacity w 14* 20.0

WIRE A125%

*Display will show wire size in the upper leftwhen displaying wire ampacity rating.

Finding Synchronous MotorHorsepowerA synchronous motor is defined as havinga 27 Amp load on a 240 Volt, 3Ø circuit.What is its Horsepower?

Steps Keystrokes DisplayClear calculator o o 0.Set to 3-phase S 3 3 PHSet to synch. S 8 SYNC 0. Enter Volts 2 4 0 U VOLT 240.Enter Amps 2 7 A AMPS 27. Solve for HP h SYNC 25. HPSet to ind. motor S 8 S 8 IND 0.


Finding Direct Current MotorHorsepowerA direct current motor is defined as havinga 10 Amp load on a 180 Volt circuit. Whatis its horsepower?

Steps Keystrokes DisplayClear calculator o o 0.Set to DC motor S 8 S 8 DC 0. Enter Volts 1 8 0 U VOLT 180.Enter Amps 1 0 A AMPS 10. Solve for HP h DC 2. HPSet to ind. motor S 8 IND 0.


The required wire size of a service con-ductor can be determined based on thespecified electrical requirements and thew key. The wire size is automaticallyrecalculated whenever the wire insulation(temperature) ratings or wire material (cop-per or aluminum) types are revised. Wiresizing is based on the requirementsdefined in NEC Tables 310-16 and 310-17.

Wire Sizing Based on Insulation RatingWiring is being installed in a 240 Volt,single-phase system rated at 30 kVA.What is the wire size needed if you use60°C copper wire?

Steps Keystrokes DisplayClear calculator o o 0.Set to 1-phase S 1 1 PHEnter kVA 3 0 K V KVA 30. Enter Volts 2 4 0 U VOLT 240. Find Amps A AMPS 125. Find wire size w AWG 0 CU

WIRE SIZEDisplay Wire Ampacity w 0 125.0 Cu WIRE ADisplay CMIL w CMIL 105,600 WIREDisplay NEC Table w NEC 310.16

Ampacity Wire Sizing


Re-sizing Wire Based on Different Insulation RatingsWhat wire size is required for a 3Ø, 75°Ccopper branch circuit carrying a load of260 Amps? What would the wire size beif 90°C copper is used?

Steps Keystrokes DisplayClear calculator o o 0.Set to 3-phase S 3 3 PHSet to 75°C S 7 3Ø 75 Cu 3 PHEnter Amps 260 A AMPS 260. Find wire size w AWG 300 CU

WIRE SIZEChange to 90˚ S 9 AWG 0000 CU

WIRE SIZEReset to 60˚ S 6 o 3Ø 60 Cu 0.

and Clear

Wire Sizing Basedon Ambient TemperatureFind the 90°C copper wire size neededto connect a 47,700 Volt-amp load to a240 Volt, single-phase source. What isthe adjusted wire size, if the ambienttemperature rating is changed from thedefault 30°C to 40°C?

Steps Keystrokes DisplayClear calculator o o 0.Set to 1-phase S 1 1 PHSet to 90°C S 9 1Ø 90 Cu 1 PHEnter VA 4 7 7 0 0 V

VA 47,700.(Cont’d)


(Cont’d)

Steps Keystrokes DisplayEnter Volts 2 4 0 U VOLT 240. Find Amps A AMPS 198.75 Find wire size w AWG 000 CU

WIRE SIZEChange ambient

temperature 2 0 S 2 AMB° 20.˚CFind adjusted

wire size w AWG 00 CUAmb WIRE SIZE

Display Wire w 00 202.8 Ampacity Amb WIRE A

Display CMIL w CMIL 133,100. WIREDisplay NEC Table w NEC 310.16 Reset ambient

temperature 3 0 S 2 AMB° 30.˚C

NOTE: See “Settings” for a list of PermanentValues/settings. Changing these settingsmay affect your calculations.


Wire 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 aluminum wiresize?

Steps Keystrokes DisplayClear calculator o o 0.Set to 3-phase S 3 3 PHSet to 75°C S 7 3Ø 75 Cu 3 PHEnter Amps 2 6 5 A

AMPS 265.Find wire size w AWG 300 CU

WIRE SIZEChange to alum. S 4 AWG 400 AL

WIRE SIZEDisplay Wire w 400 270.0

Ampacity AI WIRE ADisplay CMIL w CMIL 400,000 WIREDisplay NEC Table w NEC 310.16Reset to copper S 4 o 3Ø 75 Cu 0.

and ClearNOTE: See “Settings” for a list of PermanentValues/settings. Changing these settingsmay affect your calculations.


Sizing Parallel ConductorsWhat size 60°C insulated copper wire isrequired for a single conductor carrying a500 Amp load in a Free Air environment(30°C amb. temp.)? What size for 2 par-allel conductors? For 3 conductors?

Steps Keystrokes DisplayClear calculator o o 0.Set to 60°C S 6 3Ø 60 Cu 0Set free air mode S 5 3Ø 60 FrAir Cu 0.Enter Amps 5 0 0 A AMPS 500.Find 1 wire size w AWG 500 CU

FrAir WIRE SIZEFind 2 wire size 2 P PAR 000 CU

FrAir WIRE SIZEFind 3 wire size 3 P PAR 0 CU

FrAir WIRE SIZEExit Free Air Mode S 5 o 3Ø 60 Cu 0.

and Clear

NOTE: Parallel wire sizes smaller than 1/0will be displayed as nonE.



Finding Derated Wire SizeWhat is the derated wire size requiredfor nine 75°C copper wires, each carry-ing a maximum load of 65 Amps?

Steps Keystrokes Display

Clear calculator o o 0.Set to 75°C S 7 3Ø 75 Cu 0.Enter Amps 6 5 A AMPS 65. Find normal

wire size w AWG 6 CUWIRE SIZE

Find deratedwire size 9 S P D/R 3 CU

WIRE SIZEDisplay Wire P D/R 45.5

Ampacity WIRE ADisplay Adjustment P ADJ 70. %

FactorDisplay NEC Table P NEC 310.15



Sizing Temperature-Adjusted Derated WiresA circuit was built with 60°C copper wireconnecting a 47,650 Volt-amp load to a240 Volt, three-phase source. Ambienttemperature is 50°C. What is the deratedwire size required if eight current-carryingTHHN wires were installed in the race-way?Steps Keystrokes DisplayClear calculator o o 0.Set to 60°C S 6 3Ø 60 Cu 0.Enter Volt-amps 4 7 6 5 0 V

VA 47,650. Enter Volts 2 4 0 U VOLT 240. Set to 50°C amb 5 0 S 2 AMB° 50. °CFind adj. wire size w AWG 250 CU

Amb WIRE SIZEFind derated 8 S P D/R 500 CU

wire size Amb WIRE SIZEDisplay Wire P D/R 46.5

Ampacity Amb WIRE ADisplay Adjust. P ADJ 41. %

Factor AmbDisplay NEC Table P NEC 310.15Set to 30°C 3 0 S 2 o 0.

and ClearNOTE: All Settings should be changedback to default to avoid conflicts inanswers throughout the rest of this manu-al. See “Settings” for a list of PermanentValues/settings. Changing these settingsmay affect your calculations.


The reduction in Voltage between thepower source and the load can be de-termined by entering the Phase, Volts,Amps, wire material, Voltage drop wiresize and length of run. The calculatordetermines resistance and then the Voltage reduction. Voltage drop can bedisplayed as Volts dropped, or as a percent reduction of potential load.

This calculator also finds Voltage dropwire size once you have entered or calculated the phase, Volts, Amps,Length, wire type, and allowable VD percentage. It will solve for the distance(l) once you have entered or calculated the phase, Volts, Amps, wiretype, Voltage drop wire size, and allow-able VD percentage. The ElectriCalcPro uses resistance values found inNEC Table 8 Chapter 9 to determineVoltage drop.

NOTE: Voltage drop solutions may varyslightly from actual AC circuit meas-urements as the calculator does not incorporate factors such as inductivereactance, skin effect, raceway material,etc. In most situations, the DC VoltageDrop calculation method is sufficient tomeet safety standards for AC systems.

Voltage Drop


IMPORTANT NOTE ON VOLTAGE DROP CALCULATIONS

The ElectriCalc Pro calculates Voltagedrop and wire size using DC resistance asdefined by the 2008 NEC. To find theVoltage drop for a specific wire size, youmust first enter Amps and the one-waywire Length (and other required variables),entering the specific wire size last.

Otherwise, for your safety the calculatorwill recalculate the wire sizes based onthe NEC Ampacity Tables and maximumallowable Voltage drop.

Finding Single-Phase Voltage DropYou are installing 175 Feet of 75°C, #8 THWbranch circuit copper conductors to supplyan 11A load on a 208V 1Ø system. What isthe source Voltage drop at the load?

Steps Keystrokes DisplayClear calculator o o 0.Set to 1-phase S 1 1 PHSet to 75°C S 7 1Ø 75 Cu 1 PHEnter Amps 1 1 A AMPS 11. Enter Volts 2 0 8 U VOLT 208. Enter Length 1 7 5 l FEET 175. Enter wire size* 8 w AWG 8 CU

WIRE SIZESolve volt. drop v DROP 3.0 VSolve % v.drop v DROP 1.4 V %

* Wire size can also be entered in Circular Mils (e.g., 1 6 5 1 0 wenters 16,510 CMILs and displays 8 AWG wire size).


Finding Three-Phase Voltage DropA 20 Amp, three-phase load is being fedby a 230 Volt source located 150 Feetaway. The installation specificationsrequire 75°C #10 THW stranded copperconductor. What is the Voltage drop onthis branch circuit?

Steps Keystrokes DisplayClear calculator o o 0.Set to 75°C S 7 3Ø 75 Cu 0.Set to 3-phase S 3 3Ø 75 Cu 3 PHEnter Amps 2 0 A AMPS 20. Enter Volts 2 3 0 U VOLT 230. Enter Length(feet) 1 5 0 l FEET 150. Find VD wire size w AWG 10 CU

VD WIRE SIZESolve volt. drop v DROP 6.4 VSolve % v.drop v DROP 2.8 V %

NOTE: See “Settings” for a list ofPermanent Values/settings. Changingthese settings may affect your calculations.


Finding Voltage Drop Wire SizeA 20 Amp, three-phase 208 Volt load willbe located 175 Feet away from thesource. Assuming a 3% allowable Voltagedrop, what is the size of 75°C conductorrequired for this branch circuit?

Steps Keystrokes DisplayClear calculator o o 0.Set to 75°C S 7 3Ø 75 Cu 0.Enter Amps 2 0 A AMPS 20. Enter Volts 2 0 8 U VOLT 208. Enter distance 1 7 5 l FEET 175. Enter allow. VD% 3 v DROP 3.0 V %Find wire size w AWG 8 CU

VD WIRE SIZEFind actual

Voltage drop v DROP 4.7 VFind % v.drop v DROP 2.3 V %NOTE: See “Settings” for a list ofPermanent Values/settings. Changingthese settings may affect your calculations.


Finding Voltage Drop DistanceHow far from a three-phase 240 Voltsource can you install a 15 Amp loadusing 60°C #10 copper branch circuitconductors? Assume a 3% allowableVoltage drop.

Steps Keystrokes DisplayClear calculator o o 0.Set to 60°C S 6 3Ø 60 Cu 0.Enter Amps 1 5 A AMPS 15. Enter Volts 2 4 0 U VOLT 240.Enter wire size* 1 0 w AWG 10 Cu

WIRE SIZEEnter 3% VD 3 v DROP 3.0 V %Find distance l FEET 234.86987 Find actual

Voltage drop v DROP 7.2 VFind % v.drop v DROP 3.0 V %

* Wire size can also be entered in CircularMils (e.g., 1 0 3 8 0 w enters10,380 CMILs and displays 10 AWGwire size).NOTE: The calculator automaticallymakes adjustments for resistance usingNEC Chapter 9, Table 8, if the insulationtype is other than 75°C.

See “Settings” for a list of PermanentValues/settings. Changing these settingsmay affect your calculations.


Finding Voltage Drop ResistanceWhat is the resistance of 85 Feet of #290°C copper conductor?

Steps Keystrokes DisplayClear calculator o o 0.Set to 90°C S 9 3Ø 90 Cu 0.Enter wire size* 2 w AWG 2 CU

WIRE SIZEFind resistance S lOHMS 0.2033993

WIREFind 85 ft resist** ÷ 1 0 0 0 x

8 5 = 0.0172889

* Wire size can also be entered in CircularMils (e.g., 6 6 3 6 0 w enters66,360 CMILs and displays 2 AWG wiresize).

**Given resistance per 1000 Feet,divide by 1000 to get a per Foot resist-ance, then multiply by 85.


Finding DC ResistanceWhat is the equivalent resistance of a 12 Volt DC circuit pulling 5 Amps?

Steps Keystrokes DisplayClear calculator o o 0.Enter Voltage 1 2 S U Vdc 12. Enter Amps 5 S A Idc 5. Find resistance S V OHMS 2.4


You can use single or multiple serviceentrance conductor(s) to find thegrounding electrode conductor for ACsystems. When using multiple conduc-tors, the ElectriCalc Pro uses the equivalent Circular Mils to find thegrounding electrode conductor (basedon NEC Table 250-66).

Find the grounding electrode conductorwire size required when 2/0 is the larg-est 3-phase 75°C copper service-entrance conductor being used. What is the equivalent aluminum size? What isthe equivalent Circular Mils?

Steps Keystrokes DisplayClear calculator o o 0.Set to 3-phase S 3 3 PHSet to 75º C S 7 3Ø 75 Cu 3 PHEnter wire size* 0 0 w AWG 00 CU

WIRE SIZEFind ground wire G GRND 4 CU

size WIRE SIZEFind aluminum sizeG GRND 2 AL

WIRE SIZEFind Circular Mils G CMIL 133,100.

WIREDisplay NEC Table G NEC 250.66

* Wire size can also be entered in CircularMils (e.g., 1 3 3 1 0 0 w enters133,100 CMILs and displays 00 AWGwire size).

Ground Conductor Wire Size


The S G keystroke can be used tofind the grounding conductor size forraceways and “over-current devices incircuit ahead” equipment. The calcula-tor uses the displayed amperage valueto solve for the equipment groundingconductor based on NEC Table 250-122.

Find the equipment grounding conduc-tor size required when the circuit-breaker is rated at 45 Amps and 90°copper is being used in the installation.What is the equivalent aluminum size?

Steps Keystrokes DisplayClear calculator o o 0.Set to 90˚C S 9 3Ø 90 Cu 0.Enter Amp rating 4 5 A AMPS 45. Find equipment

ground wire size S G EQPG 10 CUWIRE SIZE

Find aluminum sizeG EQPG 8 ALWIRE SIZE

Display NEC Table G NEC 250.122Reset to 60˚C S 6 o 3Ø 60 Cu 0.

and Clear

Equipment GroundingConductor Wire Size


What is the calculated dual element andsingle element fuse size for a 230 Volt, 3-phase, 50 HP induction motor? Whatare the Instantaneous Trip and InverseTime Circuit Breaker requirements?

Steps Keystrokes DisplayClear calculator o o 0.Set to 3-phase S 3 3 PHEnter Volts 2 3 0 U VOLT 230.Enter HP 5 0 h IND 50. HPFind full current A FLC 130. AFind DE fuse size D AMPS 227.5 dE Display % used D %FLC 175. Find SE fuse size S D AMPS 390. SE Display % used D %FLC 300. Find inv. time brkr I AMPS 325. b2 Display % used I %FLC 250. Find ins. trip

breaker size S I AMPS 1,040. b1 Display % used I %FLC 800.

What NEMA size starter is required for a 575 volt, 3Ø, 20 HP induction motor?


Clear calculator o o 0.Set to 3-phase S 3 3 PHEnter Volts 5 7 5 U VOLT 575.Enter HP 2 0 h IND 20. HP Solve for

starter size S h STAR 2 SIZE

Starter Size

Fuse and Circuit Breaker Size


What overload protection device size isrequired for a 460 Volt, 3-phase, 15 HPinduction motor with a nameplate currentrating of 19.2 Amps and a 1.0 service fac-tor? What is the required overload ratingat 125% (for a 1.15 service factor)?

Steps Keystrokes DisplayClear calculator o o 0.Set to 3-phase S 3 3 PHEnter Volts 4 6 0 U VOLT 460. Enter Horsepower 1 5 h IND 15. HP Enter nameplate

current 1 9 • 2 AAMPS 19.2

Find overload size L AMPS 22.08 ol Display % used L %FLC 115. Find 125% load 1 2 5 L AMPS 24. ol Display % used L %FLC 125.Reset overload

rating and clear 1 1 5 L o 0.

Overload Protection Size


The ElectriCalc Pro can calculate the sizeof conduit required when running single ormultiple wires using the C key and thecalculator’s internal tables. The calculatoruses NEC values for area of THW/THHW,XHH/XHHW, and THHN/THWN wires.When using the actual wire areas (and fol-lowing the guidelines in NEC Chapter 9,Tables 1, 3, 4 and 5), the calculator cancalculate a conduit size based on the con-duit type and the same or different wiretypes and sizes.

To select a specific conduit type, enterthe corresponding number of the conduitand then press S C. The numbersand types are:

1) EMT 2) ENT 3) FMC 4) IMC5) LFNB 6) LFNA 7) LFMC 8) RMC9) P-80 10) P-40 11) P-A 12) P-EB

When you enter a new conduit type orscroll through the types, you will see the updated conduit size (if you have entered the wire type and quantity).

Conduit Size


Finding Motor Branch-CircuitWire Size and Conduit Size —Same Wire Type & SizeWhat size THHN copper wire and RMCconduit are needed to connect a 10 HP1Ø induction motor to a 115 Volt source?

Steps Keystrokes DisplayClear calculator o o 0.Set to 1-phase S 1 1 PHSet to 60º C S 6 1Ø 60 Cu 1 PHEnter Volts 1 1 5 U VOLT 115. Enter Horsepower 1 0 h IND 10. HP Enter cond. type 8 S C RMC nonE

CONDDisplay full load

Amps A FLC 100. AFind wire size S w AWG 0 CU

WIRE SIZE 125%Find wire ampacityw 0 125.0*

WIRE A125%Find conduit size C RMC 1.25 in

COND SIZEFind total # wires C 2. TTL WIRESFind conduit fill % C FILL 24.3

COND %Find act. fill area C FILL 0.3710

TTL WIRE AREAFind rem. area C REM 0.1021

WIRE AREASet to 3-phase S 3 o 3Ø 60 Cu 0.and Clear


* If a wire size has been calculated or stored, andthe wire type/quantity is not defined, the calculatorwill assume 2 THHN wires for 1Ø and 3 THHNwires for 3Ø when calculating conduit size.Display will also show wire size in upper left whendisplaying maximum ampacity rating.


Finding Conduit Sizes for MultipleConductors — Same Wire Typeand SizeFind the minimum IMC conduit size foreleven #6 THHN copper wires.

Steps Keystrokes DisplayClear calculator o o 0.Enter cond. type 4 S C IMC nonE

CONDEnter wire size* 6 w AWG 6 CU

WIRE SIZEEnter # THHN 1 1 ∑ THHN 11.

WIRESFind conduit size C IMC 1.25 in

COND SIZE

* Wire size can also be entered in CircularMils (e.g., 2 6 2 4 0 w enters26,240 CMILs and displays 6 AWG wiresize).


Finding Number of Wires in Existing Conduit — Same Size,Various TypesFind the maximum number of #10 THHNcopper wires that can be pulled through anexisting 3 Inch EMT conduit. How manyXHHW wires? How many THW wires?

Steps Keystrokes DisplayClear calculator o o 0.Enter cond. type 1 S C EMT nonE

COND Enter wire size* 1 0 w AWG 10 CU

WIRE SIZEEnter conduit size 3 C EMT 3.00 in

COND SIZEFind max THHN # ∑ THHN 167.

TTL WIRESFind max XHHW# ≈ XHHW 145.

TTL WIRESFind max THW # † THW 145.

TTL WIRES

* Wire size can also be entered in Circular Mils (e.g., 1 0 3 8 0 wenters 10,380 CMILs and displays 10AWG wire size).


Finding Conduit Size - MultipleConductors Different Wire Sizesand Types

Three 1/0 THWN 75°C conductors andone #2 XHHW 75°C copper conductorare to connect to a panel board using asingle conduit. What is the cross-sectional area of wires, conduit size and actual fill area? (Note: The cross-sectional areas are the same for bothTHHN and THWN; display will show asTHHN.)Steps Keystrokes Display

Clear calculator o o 0.Set to 75° S 7 3Ø Cu 75 0.Enter cond. type 3 S C FMC nonE

CONDEnter 1st wire sz* 0 w AWG 0 CU

WIRE SIZEEnter #, type wire 3 ∑ THHN 3.

WIRESFind cross-section

wire area ∑ THHN 0.5565WIRE AREA

Enter 2nd wire sz*2 w AWG 2 CUWIRE SIZE

Enter #, type wire 1 ≈ XHHW 1.WIRE

Find cross-sect. ≈ XHHW 0.1146WIRE AREA

Find conduit size C FMC 1.50 inCOND SIZE

(Cont’d)


(Cont’d)


Find total # wires C 4.TTL WIRES

Find conduit fill % C FILL 36.1COND %

Find actual fill area C FILL 0.6711 TTL WIRE AREA

Find remaining area C REM 0.0717WIRE AREA

* Wire size can also be entered in CircularMils (e.g., 1 0 5 6 0 0 w enters105,600 CMILs and displays 0 AWG wiresize; 6 6 3 6 0 w enters 66,360CMILs and displays 2 AWG wire size).


Find the equivalent BTU rating of a 3.5kw-hr rated furnace.

Steps Keystrokes DisplayClear calculator o o 0.Enter Kilowatt 3 • 5 3.5

HoursFind Equivalent S • BTU 11,953.552

BTU

Converting KW-HR and BTU


What is the kw-hr rating for a 4,500 BTUheater?

Steps Keystrokes DisplayClear calculator o o 0.Enter BTU 4 5 0 0 4,500.

RatingFind Equivalent S = KW-H 1.3176

Kilowatt Hours

Find the equivalent resistane for 10Ohm, 20 Ohm, and 50 Ohm resistorsplaced in parallel.

Steps Keystrokes DisplayClear calculator o o 0.Enter 1st Resistor 1 0 S s P-RS 10. Enter 2nd Resistor 2 0 S s

P-RS 6.6666667 Enter 3rd Resistor 5 0 S s

P-RS 5.8823529

NOTE: The total is recalculated with eachadditional resistor value entered.

Parallel Resistance


The error codes for the ElectriCalc Proare listed below (Note: To clear an error, perform a Clear All S x):

DISPLAY ERROR DESCRIPTION

OFLO Answer too large to display ENT Error Invalid or out-of-scale entryPOWR Error PF or EFF calculated above 100%nonE Conduit Size beyond limits of table

Unable to calculate Voltage Dropwire Size(Amps/Length too high)Temperature setting out of rangefor wire calculation.

HP Error Invalid HP entry per NEC tableFULL Error Entered or calculated more than

15 different wires sizesEROM Error Bad EROMMATH Error Math error (i.e., divide by zero)

The calculator is powered by a single 3-Volt Lithium CR-2032 battery. Thisshould last upwards of 800 hours ofactual use (One year plus for most peo-ple). If the display becomes very dim orerratic, replace the battery.

NOTE: Please use caution when dispos-ing of your old batteries as they containhazardous chemicals.

Battery Information

Error Codes


Battery Replacement Instructions:

1) Hold calculator upright with back ofcalculator toward you.2) Lift battery holder out from the top ofthe calculator.3) Remove the old battery.4) Place new battery with positive sideagainst the bottom of the holder.5) Insert holder into calculator with positive side of battery facing back ofcalculator.

Table 250.66 Table 250.122Table 310.15(b)(2)(a)Table 310.16 Table 310.17Chapter 9, Table 1, 4, 5 and 8Section 430.32 Table 430.148Table 430.150 Table 430.152Appendix C

National Electrical Code® and NEC® are registeredtrademarks of the National Fire ProtectionAssociation, Inc., Quincy, MA 02269

All listed table references are based on NEC2008. Previous code years may have differenttable references.

2008 NEC References


This model is updateable for future NECEditions. For information on future codes,contact the dealer where this calculatorwas purchased or you may contactCalculated Industries, Inc. in the fall of theyear prior.

Permanent Values/SettingsValues and settings maintained in perma-nent Memory can only be changed (1) bypressing S x (resets calculator todefault settings), or (2) by changing eachone or all of these settings. The followingare permanent values:

(1) Selectable (60°C/75°C/90°C) insulationratings and CU/AL wire type ratings

(2) Phase setting (1Ø/3Ø)(3) The entered values for Volts, Volt-

age Drop %, Power Factor % and Efficiency %

(4) Ambient Temperature setting(5) Feet/Meters setting

Semi-Permanent ValuesThe following semi-permanent valuesare cleared to default settings when thecalculator is shut-off:

(1) Cumulative Memory (M+)(2) Free Air mode

Settings

Updating Future CodeRevisions


Return Guidelines

1. Please read the Warranty in thisUser's Guide to determine if yourCalculated Industries productremains under warranty beforecalling or returning any device forevaluation or repairs.

2. If your product will not turn on,check the battery as outlined inthe User's Guide.

3. If you need more assistance,please go to the website listedbelow.

4. If you believe you need to returnyour product, please call aCalculated Industries’ representa-tive between the hours of 7:00amand 4:00pm Pacific Time for addi-tional information and a ReturnMerchandise Authorization (RMA).

Call Toll Free: 1-800-854-8075

Outside USA: 1-775-885-4900

www.calculated.com/warranty

Repair and Return


Warranty Repair Service –U.S.A.Calculated Industries (“CI”) warrants thisproduct against defects in materials andworkmanship for a period of one (1) yearfrom the date of original consumerpurchase in the U.S. If a defect existsduring the warranty period, CI, at itsoption, will either repair (using new orremanufactured parts) or replace (with anew or remanufactured calculator) theproduct at no charge.

THE WARRANTY WILL NOT APPLY TO THEPRODUCT IF IT HAS BEEN DAMAGED BYMISUSE, ALTERATION, ACCIDENT, IMPROP-ER HANDLING OR OPERATION, OR IFUNAUTHORIZED REPAIRS ARE ATTEMPTEDOR MADE. SOME EXAMPLES OF DAMAGESNOT COVERED BY WARRANTY INCLUDE,BUT ARE NOT LIMITED TO, BATTERY LEAK-AGE, BENDING, A BLACK “INK SPOT” ORVISIBLE CRACKING OF THE LCD, WHICHARE PRESUMED TO BE DAMAGES RESULT-ING FROM MISUSE OR ABUSE.

To obtain warranty service in the U.S.,please go to the website.

A repaired or replacement productassumes the remaining warranty of theoriginal product or 90 days, whichever islonger.

Warranty


Non-Warranty Repair Service– U.S.A.Non-warranty repair covers servicebeyond the warranty period, or servicerequested due to damage resulting frommisuse or abuse.

Contact Calculated Industries at the num-ber listed above to obtain current productrepair information and charges. Repairsare guaranteed for 90 days.

Repair Service – Outside U.S.A.To obtain warranty or non-warranty repairservice for goods purchased outside theU.S., contact the dealer through whichyou initially purchased the product. If youcannot reasonably have the productrepaired in your area, you may contact CIto obtain current product repair informa-tion and charges, including freight andduties.


DisclaimerCI MAKES NO WARRANTY OR REPRESEN-TATION, EITHER EXPRESS OR IMPLIED,WITH RESPECT TO THE PRODUCT’SQUALITY, PERFORMANCE, MER-CHANTABILITY, OR FITNESS FOR A PAR-TICULAR PURPOSE. AS A RESULT, THISPRODUCT, INCLUDING BUT NOT LIMITEDTO, KEYSTROKE PROCEDURES, MATHE-MATICAL ACCURACY AND PREPRO-GRAMMED MATERIAL, IS SOLD “AS IS,”AND YOU THE PURCHASER ASSUME THEENTIRE RISK AS TO ITS QUALITY ANDPERFORMANCE. IN NO EVENT WILL CI BELIABLE FOR DIRECT, INDIRECT, SPECIAL,INCIDENTAL, OR CONSEQUENTIAL DAM-AGES RESULTING FROM ANY DEFECT INTHE PRODUCT OR ITS DOCUMENTATION.

The warranty, disclaimer, and remediesset forth above are exclusive andreplace all others, oral or written,expressed or implied. No CI dealer,agent, or employee is authorized tomake any modification, extension, oraddition to this warranty.

Some states do not allow the exclusionor limitation of implied warranties or lia-bility for incidental or consequentialdamages, so the above limitation orexclusion may not apply to you. Thiswarranty gives you specific rights, andyou may also have other rights, whichvary from state to state.


This equipment has been certified tocomply with the limits for a Class B cal-culating device, pursuant to Subpart J ofPart 15 of FCC rules.

Software copyrighted and licensed to Calculated Industries by

Specialty Calculator Technologies, LLC, 2008.

User’s Guide copyrighted by CalculatedIndustries, Inc., 2008.

ElectriCalc® and Calculated Industries® are

registered trademarks of Calculated Industries, Inc.

4840 Hytech DriveCarson City, NV 89706 U.S.A.

1-800-854-8075 • Fax: 1-775-885-4949E-mail: [email protected]

www.calculated.com

ALL RIGHTS RESERVEDDesigned in the U.S.A.

Legal Notices

FCC Class B

Manual Calculadora UG5065E-B

Documents

grounding

allowable

dual element

inverse time

minimum amp

derated wire

determine

actual voltage