Calculated Industries 5070 ElectriCalc Pro User Guide 66 Pages
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TABLE OF CONTENTS
ELECTRICALC ® PRO ..........................................................................3
GETTING STARTED ............................................................................4
KEY DEFINITIONS ...............................................................................4
Basic Function Keys ..........................................................................4
Mode Setup Keys ..............................................................................5
Electrical Keys ....................................................................................6
Motor Keys ..........................................................................................8
Wire Sizing Keys .................................................................................9
Voltage Drop Keys ............................................................................11
Grounding Conductor Keys ...............................................................12
Fuse/Breaker Keys ...........................................................................13
Conduit Sizing Keys ..........................................................................15
PREFERENCE SETTINGS ................................................................18
BASIC MATH OPERATIONS ..........................................................19
PERCENT CALCULATIONS ..........................................................19
MEMORY OPERATIONS ...................................................................19
Using M+ ...........................................................................................20
Using Memory Storage Keys (M1 M9) .............................................20
USING THE ELECTRICALC PRO .................................................21
KIRCHHOFF’S LAW ...........................................................................21
Finding Voltage .................................................................................21
Finding Amps ....................................................................................22
Finding Current Load ........................................................................22
Finding Amps From Kilowatts ...........................................................23
Finding VoltAmps .............................................................................23
Finding kVA Rating ...........................................................................24
Finding Wattage ...............................................................................24
Finding kW Rating ............................................................................25
OHM’S LAW .........................................................................................26
Finding Volts .....................................................................................26
Finding Amps ....................................................................................26
Finding Resistance (Ohms) ..............................................................27
MOTOR FUNCTIONS .........................................................................27
Finding SinglePhase FullLoad Current ...........................................28
Finding Motor Wire Size and Ampacity .............................................28
Finding Synchronous Motor Horsepower ..........................................29
Finding Direct Current Motor Horsepower ........................................30
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AMPACITY WIRE SIZING ....................................................................30
Wire Sizing Based on Insulation Rating ............................................31
ReSizing Wire Based on Different Insulation Ratings ......................32
Wire Sizing Based on Ambient Temperature ....................................32
Wire Sizing Based on Material Type .................................................34
Sizing Parallel Conductors ................................................................35
Finding Derated Wire Size ................................................................36
Sizing TemperatureAdjusted Derated Wires ....................................36
VOLTAGE DROP ..................................................................................38
Finding SinglePhase Voltage Drop ..................................................38
Finding ThreePhase Voltage Drop ...................................................39
Finding Voltage Drop Wire Size ........................................................40
Finding Voltage Drop Distance .........................................................41
Finding Voltage Drop Resistance ......................................................43
GROUND CONDUCTOR WIRE SIZE ..................................................44
EQUIPMENT GROUNDING COUNDUCTOR WIRE SIZE ...................45
FUSE AND CIRCUIT BREAKER SIZE .................................................45
STARTER SIZE ....................................................................................47
OVERLOAD PROTECTION SIZE .....................................................47
CONDUIT SIZE ...................................................................................48
Finding Motor BranchCircuit Wire Size and Conduit Size —
Same Wire Type and Size ................................................................49
Finding Conduit Sizes For Multiple Conductors —
Same Wire Type and Size ................................................................50
Finding Number of Wires in Existing Conduit —
Same Size, Various Types ..............................................................51
Finding Conduit Size —
Multiple Conductors, Different Wire Sizes and Types .......................52
CONVERTING KILOWATTHOUR AND BTU ...................................53
PARALLEL RESISTANCE ..................................................................54
APPENDIX A — DEFAULT SETTINGS .............................................55
APPENDIX B — PREFERENCE SETTINGS ..................................56
APPENDIX C — 2017 NEC REFERENCES ......................................57
APPENDIX D — CARE INSTRUCTIONS ..........................................57
APPENDIX E — ACCURACY/ERRORS,
AUTO SHUTOFF, BATTERIES, RESET ...........................................58
REPAIR AND RETURN ....................................................................60
WARRANTY ......................................................................................61
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ELECTRICALC
®
PRO
The ElectriCalc ® Pro is an invaluable calculator for today’s busy electrical professional. Unlike a regular calculator, it has intuitively labeled “electrical keys” and conforms to the 2017 (and 2014, 2011,
2008, 2005, 2002, 1999, 1996) and future National Electrical Codes, allowing you to solve Coderelated problems quickly and accurately.
The most common NEC tables are now at your fingertips.
An important feature of the ElectriCalc ® Pro is that it is programmed to accept future NEC changes, allowing you to conveniently install future Code editions in a few simple steps.
The ElectriCalc ® Pro instantly solves for:
• Kirchhoff’s Law
• Ohm’s Law
• Volts, Amps, VoltAmps, Watts, kVA, kW, PF%, EFF%, and Resistance
• Copper and Aluminum Wire Sizes
• Parallel and Derated Wire Sizes
• Voltage Drop Wire Sizes, % and Actual Voltage Drops,
Voltage Drop Distances and Wire Resistances
• Kilowatt hours and BTU’s
• Parallel Resistance
• Grounding Conductors Sizes
• Motor FullLoad Amps
• Overload Protection Sizes
• NEMA Starter Sizes
• Conduit Sizes
• And much more!
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GETTING STARTED
You may want to practice getting a feel for your calculator keys by reading through the key definitions and learning how to enter data, how to store values, etc., before proceeding to the examples.
KEY DEFINITIONS
Basic Function Keys
On/Clear Key — Turns on power. Pressing once clears the last entry and the display.
Pressing twice clears all temporary values.
Off — Turns all power off. Clears all nonpermanent values.

and
Arithmetic operation keys.
Keys used for entering numbers.
Set — Used with other keys to access secondary functions.
Store — Used for storing values.
Storage Registers M1 through M9 — Used to store values in Memory registers 1 through 9.
Recall — Used with other keys to recall stored values and settings.
Memory Clear — Clears Accumulative Memory and displays total.
Accumulative Memory (M+) — Adds displayed value to Accumulative Memory.
Memory Recall — Displays the value saved in the Accumulative Memory register.
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Memory Clear (MR/C) — Clears Accumulative
Memory without changing current display.
Percentage — Used to find a given percent of a number.
x 2 — Squares the value on the display.
Backspace Function — Used to delete entries one keystroke at a time (unlike the
function, which deletes the entire entry).
Square Root (
!
) — Calculates the Square
Root of the number on the display.
Reciprocal (1/ x ) — Finds the Reciprocal of a number (e.g., 0.125
).
Clear All — Returns all stored values to the default settings. Does not affect Preference Settings.
Change Sign (+/–) — Toggle displayed value between negative and positive value.
Pi — Displays value of
π
(3.1415927).
Mode Setup Keys
Preference Settings (Prefs) — Use to define calculator modes (see Preference
Settings section).
SinglePhase (1Ø) — Sets calculator to Single
Phase mode.
ThreePhase (3Ø) — Sets calculator to
ThreePhase mode. This is the default setting.
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Ambient Temperature (Amb°) — Temporarily enters ambient temperature for determining ampacityderived Wire Sizes. Ambient temperature will only change when entering a new value or by pressing . Defaults to 30°C (86°F).
Amb will display when the Ambient Temperature is other than 30°C (86°F).
Note: The temperature units can be displayed in
Celsius (°C) or Fahrenheit (°F) by changing the
Preference Setting (see Preference Settings section).
Copper/Aluminum (Cu/Al) — Used to toggle between Copper (default) and Aluminum
Wire Types. When the Wire Type is revised, any calculated Wire Size will be recalculated automatically. If a Wire Size is entered with the wrong Wire Type, pressing will change the material type without changing the size.
Free Air (FrAir) — Sets calculator to Free Air mode, which refers to NEC Table 310.15(B)(17) for Wire Size calculations.
60°C Wire Insulation — Sets calculator to 60°C
Wire Insulation Type for Wire Size calculations.
This is the default setting.
75°C Wire Insulation — Sets calculator to 75°C
Wire Insulation Type for Wire Size calculations.
90°C Wire Insulation — Sets calculator to 90°C
Wire Insulation Type for Wire Size calculations.
Electrical Keys
kilo — Used with Watts, Amps, Volts, and
VoltAmps keys to identify “kilo” values.
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milli — Used with Watts, Amps, Volts, and
VoltAmps keys to identify “milli” values.
Amps — Enters or calculates Amps (using Volts and VA or Watts).
Volts — Enters or calculates Volts (using
Amps, HPth, and VA or Watts). Default value is 240 Volts.
VoltAmps — Enters or calculates VoltAmps
(using Amps, Volts and Horsepower or Watts).
Watts — Enters or calculates Watts (using Amps,
Volts, and VA or Horsepower).
DC Amps (Idc) — Enters or calculates DC Amps
(using DC Volts and Resistance).
DC Volts (Vdc) — Enters or calculates DC Volts
(using DC Amps and Resistance).
DC Resistance (R) — Calculates and displays
DC Resistance in Ohms (using DC Volts and
DC Amps).
Power Factor (PF%) — Enters or calculates
Power Factor percentage (based on Watts and VA). Default value is 100%. Entered or calculated Power Factors greater than 100% will result in an error.
Theoretical Horsepower — Enters or calculates
Theoretical Horsepower (based on Amps, VA,
Watts, Efficiency%, PF%, and/or Volts). 1.0 HPth correlates to 746 Watts at 100% Efficiency.
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Efficiency (Eff%) — Enters or calculates the percent ratio between real power (Watts) and
Theoretical Horsepower. Default value is 100%.
Entered or calculated Efficiencies greater than
100% will result in an error.
Kilowatt–Hours to BTU (Kwhr ► Btu) —
Calculates BTU (British Thermal Unit) based on an entered KilowattHour value.
BTU to Kilowatt–Hours (Btu ► Kwhr) —
Calculates KilowattHours based on an entered
BTU (British Thermal Unit) value.
Parallel Resistance (Par Res) — Calculates total Resistance based on an entered series of
Parallel Resistor values.
Motor Keys
The ElectriCalc Pro can be used to determine motor FullLoad Current
(Amps) based on entries for Motor Horsepower (HPmotor), Phase and Voltage. You can also find an equivalent Motor Horsepower if you have entered Voltage and FullLoad Current values. Only HP Motor and Voltage entries as defined by NEC Tables 430.247, 430.248 and
430.250 can be used to determine motor loads.
Induction/Synchronous/DC Motor Toggle (Ind/
Sync/DC) — Used to scroll though Induction,
Synchronous, and Direct Current Motor Types.
Motor Horsepower — Enters or calculates
Motor Horsepower.
Starter Size (Starter) — Displays the Starter
Size (from NEMA publication ICS 21988 Tables
23271 and 23272) based on the Phase,
Voltage, and Motor Horsepower settings.
Note: Horsepower values not identified in NEMA tables will cause the calculator to round up to the next larger Starter Size in the table.
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Wire Sizing Keys
The ElectriCalc Pro uses NEC Table 310.15(B)(16) (310.15(B)(17) for Free Air) to find Wire Sizes and Ampacity ratings of wires. The calculator uses the following data to calculate Wire Size:
1) Insulation temperature rating (60°C, 75°C and 90°C)
2) Wire material (Copper or Aluminum)
3) Ambient Temperature
Standard AWG Wire Sizes and Circular Mils are used by the
ElectriCalc Pro . Wire Size entries less than or equal to 2,000 are accepted as AWG Wire Sizes; entries greater than 2,000 are accepted as Circular Mil entries and display the corresponding AWG
Wire Size. Entries must match the standard Wire Sizes or Circular
Mils; otherwise, nonE will be displayed (invalid entry).
Note: 1/0, 2/0, 3/0 and 4/0 wires are entered using the key
(e.g., 0, 00, 000 and 0000).
Wire Size/Ampacity — Enters or calculates Wire
Size based on Ampacity and Voltage Drop, if a
Voltage Drop Length has been entered.
♦ First Press
If a Wire Length has been entered, the first press will show the larger of the Ampacity or
Voltage Drop derived Wire Size. The calculator will use the larger value when calculations require a Wire Size. If no Voltage Drop Length has been entered, the calculator will display the calculated Ampacityrated Wire Size.
♦ Second Press
If a Wire Length has been entered, the second press displays the smaller of the two Wire
Sizes. If not solving for Voltage Drop Wire Size, then displays the maximum Ampacity.
♦ Third Press
Displays the Wire Size in Circular Mils.
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♦ Fourth Press
If a Wire Length has been entered, displays the minimum Wire Ampacity rating. If no Wire
Length has been entered, displays the NEC table referenced for the calculation.
125% Ampacity (125%) — Used for Motor Wire
Sizing when the Wire must not exceed 80% of its rated Ampacity (125%A). This keystroke calculates
Wire Size based on 125% of the entered or calculated Amps value.
Parallel Size — Used to find the size of parallel conductors using Amperage and an entered quantity of Wires. Parallel Wire Size calculations smaller than 1/0 will display nonE , as the NEC does not allow Parallel Wire runs smaller than 1/0.
♦ First Press
When preceded by a number, calculates the applicable Wire Size for that quantity of
Wires in parallel.
♦ Second Press
Displays the maximum adjusted Ampacity of the calculated Parallel Wire Size.
Note: No adjustments are made for deration.
Derated Wire Size (D/R Size) — Used to calculate Derated Wire Sizes and allowable
Ampacity based on the entered quantity of wires,
NEC Table 310.15(B)(16) and NEC Table
310.15(B)(3)(a). Derated Wire Sizes are not calculated when there are less than four Wires, or when the unit is in Free Air mode.
♦ First Press
Calculates the Derated Wire Size, if you have entered the number of Wires.
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♦ Second Press
Displays the maximum adjusted Ampacity of the Derated Wire Size.
♦ Third Press
Displays the Derated Adjustment Factor per the NEC Table 310.15(B)(3)(a).
♦ Fourth Press
Displays the NEC table referenced for the calculation.
Voltage Drop Keys
The ElectriCalc Pro will calculate maximum Lengths, minimum Wire
Sizes or actual Voltage Drops given the other two values. Voltage
Drop solutions are based on the DC Resistance values found in
NEC Chapter 9, Table 8.
Note: Voltage Drop solutions may vary slightly from actual AC circuit values as the calculator does not incorporate factors such as inductive reactance, skin effect, raceway material, etc.
Percent Voltage Drop — Used to enter or calculate Voltage Drop. The default Voltage Drop is 3%. If Wire Size or Wire Length values are not available, nonE will display, since the Voltage
Drop cannot be found.
♦ First Press
Enters a maximum allowable Voltage Drop percentage or calculates actual Voltage Drop.
♦ Second Press
Calculates actual percent Voltage Drop.
Length — Enters or calculates the Length of a run for Voltage Drop calculation.
Note: Units of Length can be set to Feet or
Meters by changing the Preference Setting (see
Preference Settings section).
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Wire Resistance (Wire Res) — Displays the actual Resistance per 1,000 Feet of the Wire Size in
based on NEC Chapter 9, Table 8.
Grounding Conductor Keys
Ground — Used to find the Grounding electrode conductor size for AC systems based on NEC
Table 250.66 and an entered or calculated serviceentrance conductor (largest size). Only actual Wire Sizes are considered valid entries.
♦ First Press
Calculates the copper Grounding electrode conductor size if you have entered a valid
Wire Size.
♦ Second Press
Displays the aluminum Grounding electrode conductor size.
♦ Third Press
Displays the Circular Mil area used to calculate the Grounding electrode conductor size.
♦ Fourth Press
Displays the NEC table referenced for the calculation.
Equipment Ground (EqGrnd) — This function uses NEC Table 250.122 to calculate the minimum equipment Grounding conductor size, given an entered Amperage rating or setting for an overcurrent device up line.
Note: This function deviates from the NEC Table
250.122 in that 1250 MCM AL is used instead of
1200 as specified in NEC Table 250.122.
♦ First Press
Displays the copper Grounding conductor size for the entered Amp rating.
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♦ Second Press
Displays the aluminum Grounding conductor size.
♦ Third Press
Displays the NEC table referenced for the calculation.
Fuse/Breaker Keys
The ElectriCalc Pro has special keys that automatically calculate the
Amp ratings of the following overcurrent protection devices: Dual
Element Fuses (Time Delay), Single Element Fuses (NonTime
Delay), Instantaneous Trip Breakers (Type 1), Inverse Time Breakers
(Type 2), and Overload Protection Devices.
These Fuse and Circuit Breaker sizes are derived using the “Percent of FullLoad Current” multipliers listed in NEC Table 430.52.
If a parameter is missing or invalid, the calculator will display nonE .
Overload Protection —
♦ First Press
Displays the Overload Amperage requirement based on the FullLoad Current shown on the motor nameplate. Multiplies the entered motor nameplate FullLoad Current
(stored in the
register) by 115% or the value you enter.
Conforms to NEC Section 430.32(A)(1) value of 115%, unless you enter another value. For example, entering 125
would calculate
Overload protection based on 125% of the entered Amperage.
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♦ Second Press
Displays the FullLoad Current percent multiplier value used to determine the Overload current protection size. Subsequent presses of
repeat the cycle.
Motor Type (MType) — Based on NEC Table
430.52, this function selects the Motor Type used to define the percent factors for Breakers/Fuses.
Once set, the Motor Type remains fixed until you change it or perform a Clear All
( ).
♦ First Press
Displays the current Motor Type. Note there is no Motor Type in SinglePhase mode.
♦ Second Press
In ThreePhase mode only, subsequent presses of
will select and display the next Motor Type from this list: SQC nonb
(Squirrel Cage, nonDesign B), SQC b
(Squirrel Cage, Design B), SYNC no codE
(Synchronous), WND no codE (Wound Rotor).
Dual Element Fuse —
♦ First Press
Calculates the minimum Amp rating for a
Dual Element Fuse.
♦ Second Press
Displays the FullLoad Current percent multiplier used to determine Fuse size.
Single Element Fuse (SEFuse) —
♦ First Press
Displays the minimum Amp rating based on
Phase, Motor Type, and Amperage.
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♦ Second Press
Displays the FullLoad Current percent multiplier value used to determine Fuse size.
Subsequent presses repeat this cycle.
Inverse Time Breaker —
♦ First Press
Displays the minimum Amp rating for an
Inverse Time Breaker, based on the Phase,
Motor Type, and Amperage.
♦ Second Press
Displays the FullLoad Current percent multiplier value used to determine Breaker Size.
Instantaneous Trip Circuit Breaker (InsTrip) —
♦ First Press
Displays the minimum Amp rating for an
Instantaneous Trip Circuit Breaker, based on the Phase, Motor Type, and Amperage.
♦ Second Press
Displays the FullLoad Current percent multiplier value used to determine Breaker Size.
Conduit Sizing Keys
The ElectriCalc Pro calculates Conduit Size using NEC Tables 1, 4 and 5 of Chapter 9 (given Insulation Type, Wire Size, and quantity of Wires). It will also calculate the Number of Wires of a specified
Insulation Type and Wire Size that will fit in a defined Conduit Size.
Acceptable Conduit Sizes (depending on the type of Conduit used) are as follows: 3/8", 1/2", 3/4", 1", 11/4", 11/2", 2", 21/2", 3", 31/2",
4", 5", and 6". Conduit Sizes are entered using decimal equivalents
(e.g., 11/2" is entered as 1.5, 3/4" is entered as 0.75, etc.).
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, ,
Number of Wires — Used to enter or calculate the Number of Wires in a raceway and calculate crosssectional Wire Area.
♦ First Press
Enters Number of Wires or calculates maximum Number of Wires in Conduit.
♦ Second Press
Shows total crosssectional area for all entered Wires.
♦ Third Press
Shows total crosssectional area of all entered
Wires of the selected Wire Insulation.
Conduit Size — Used to find Conduit Sizes based on the total area of the entered Wire
Types and Wire Sizes (up to 10 at one time). If the quantity and Insulation Type have not been entered, the calculator will assume 2 THHN Wires for SinglePhase or 3 THHN Wires for Three
Phase calculations.
♦ First Press
Enters or calculates Conduit Size.
Note: If a Wire Size has not been entered or calculated, or an invalid Conduit Size is entered, the calculator will display nonE .
♦ Second Press
Shows Total Number of Wires in the Conduit for calculated Conduit Size. Shows the Conduit internal Area for an entered Conduit.
Note: Third through fifth presses will only be displayed for calculated Conduit Sizes.
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♦ Third Press
Shows Fill Percentage for the calculated
Conduit Size as determined by NEC
Table 1, Chapter 9.
♦ Fourth Press
Shows the Total Wire Area for all entered Wires.
♦ Fifth Press
Shows Remaining Fill Area. This value may be negative if all Wires are the same size due to
Note 7 in NEC Chapter 9, Table 1.
Conduit Type (Cond Type) — Used to select the desired Conduit Type. Pressing these keys with a value between 1 and 12 will select the corresponding Conduit Type, as specified in the list below (i.e.,
selects the EMT
Conduit).
♦ First Press
Displays the currently selected Conduit Type.
Continuous presses of
scroll through the available Conduit Types.
1) EMT (Electrical Metal Tubing)
2) ENT (Electrical Nonmetallic Tubing)
3) FMC (Flexible Metal Conduit)
4) IMC (Intermediate Metal Conduit)
5) LFNB (Liquidtight Flexible Nonmetallic
ConduitB)
6) LFNA (Liquidtight Flexible Nonmetallic
ConduitA)
7) LFMC (Liquidtight Flexible Metal Conduit)
8) RMC (Rigid Metal Conduit)
9) P80 (Rigid PVC Conduit, Schedule 80)
10) P40 (Rigid PVC Conduit, Schedule 40)
11) PA (Rigid PVC Conduit, Type A)
12) PEB (Rigid PVC Conduit, Type EB)
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PREFERENCE SETTINGS
Press
, then
to access the Preferences menu. Continue pressing
to scroll through different Preferences. Press
or
keys to scroll through options of the different Preferences. Press
to exit Preferences. Your calculator will keep your Preference
Settings until a Full Reset alters your settings to the default values
(see Appendix for more information).
KEYSTROKE DISPLAY
(Prefs )
(NEC Code)
(repeats options)
Second press of :
(Ambient Temperature Units)
NEC 2017
NEC 1996
NEC 1999
NEC 2002
NEC 2005
NEC 2008
NEC 2011
NEC 2014
NEC 2017
AMBº 30. ºC*
AMBº 86. ºC*
(repeats options) AMBº 30. ºC*
* These values will differ if you have changed the Ambient Temperature.
Third press of
(Length Units)
:
FEET 1.
(repeats options)
MET 1.
FEET 1.
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BASIC MATH OPERATIONS
This calculator uses standard chaining logic, which simply means that the entered mathematical string is evaluated from left to right without any priority given to different operators.
KEYSTROKE
DISPLAY
6.
1.5
5.
1.
PERCENT CALCULATIONS
The key can be used for finding a given percentage of a number or for working addon, discount or division percentage calculations.
KEYSTROKE
DISPLAY
53.25
266.25
23.75
200.
The key also allows you to change percentages to decimals
(e.g., displays 0.25
).
MEMORY OPERATIONS
Whenever the
keys are pressed, the displayed value will be added to the Cumulative Memory. Other Memory functions:
FUNCTION
Add to Memory
Subtract from Memory
Recall total in Memory
Display/Clear Memory
Clear Memory
KEYSTROKE
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Memory is semipermanent, clearing only when you do one of the following:
– turn off the calculator
– press
– press
– press (Clear All).
When memory is recalled (
), consecutive presses of
will display the calculated Average and total Count of the accumulated values.
Using M+
KEYSTROKE DISPLAY
(M+)
(M+)
(M)
M+ 355.
M+ 255.
&
&
M 745. &
TTL – 135. &
AVG – 45.
CNT 3.
&
&
– 135.
Using Memory Storage Keys (M1 M9)
In addition to the standard cumulative Memory (as previously described), your calculator has nine independent Storage
Registers – M1 through M9 – that can be used to permanently store single, noncumulative values. The following example shows the use of M1 ( ). To use M2 through M9, replace the presses of the key with presses of the corresponding number key ( through ).
You can replace a value in one of these Memory registers by storing a new value in place of the stored value.
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FUNCTION
Store single value in M1
Clear M1
Recall M1
KEYSTROKE
Store 175 into M1, recall the value, and then clear the value.
KEYSTROKE DISPLAY
M1 175.
0.
M1 175.
M1 0.
USING THE ELECTRICALC PRO
KIRCHHOFF’S LAW
The ElectriCalc Pro utilizes Kirchhoff’s Law in finding Volts, Amps,
VoltAmps, Watts, Horsepower (theoretical), Efficiency and Power Factor.
Finding Voltage
Find the Voltage supply to a SinglePhase load drawing 14,605 Voltamps and 115 Amps.
KEYSTROKE DISPLAY
0.
1. Set to 1Phase:
(1Ø) 1 Ø
1 PH
2. Enter VA:
VA 14,605.
3. Enter Amps:
AMPS 115.
4. Solve for Volts:
VOLT 127.
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Finding Amps
What is the current (Amps) for a load drawing 8,250 VoltAmps on a 240 Volt, ThreePhase circuit?
KEYSTROKE DISPLAY
0.
1. Set to 3Phase:
(3Ø) 3Ø
3 PH
2. Enter VA:
VA 8,250.
3. Enter Volts:
4. Solve for Amps:
AMPS 19.846416
Finding Current Load
A building with 120/240 Volt 1Ø service has the following loads:
Range = 7,800 VA Heating = 15,100 VA
Dryer = 5,100 VA Appliances = 8,900 VA
Lighting = 6,470 VA
What is the service load (Amps) of the circuit supplying this building?
KEYSTROKE
DISPLAY
0.
1. Set to 1Phase:
(1Ø)
2. Add VA loads:
VOLT 240.
1 Ø 1 PH
7,800.
22,900.
28,000.
36,900.
43,370.
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KEYSTROKE
3. Enter as VA:
4. Enter Volts:
5. Solve for Amps:
DISPLAY
VA 43,370.
VOLT 240.
AMPS 180.70833
Finding Amps From Kilowatts
What is the Amperage for a 75 kW load connected in a 120/208 Volt,
3Ø circuit?
KEYSTROKE
DISPLAY
0.
1. Set to 3Phase:
(3Ø)
2. Enter kilowatts:
3Ø PH
KW 75.
3. Enter Volts:
VOLT 208.
4. Solve for Amps:
AMPS 208.17918
Finding VoltAmps
What is the VA rating for a 120 Volt, 22 Amp, 1Ø circuit? What is the kVA rating?
KEYSTROKE
DISPLAY
0.
1. Set to 1Phase:
(1Ø)
1 Ø
1 PH
(cont’d)
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(cont’d)
KEYSTROKE
2. Enter Volts:
3. Enter Amps:
4. Solve for VoltAmps:
5. Solve for kVA:
DISPLAY
VOLT 120.
AMPS 22.
VA 2,640.
KVA 2.64
Finding kVA Rating
What is the kVA rating for a 120/208 Volt, ThreePhase,
65 Amp transformer?
KEYSTROKE
1. Set to 3Phase:
(3Ø)
2. Enter Volts:
DISPLAY
0.
3Ø
3 PH
VOLT 208.
3. Enter Amps:
AMPS 65.
4. Solve for kVA:
KVA 23.417327
Finding Wattage
A 120 Volt, SinglePhase, 45 Amp electrical motor has an 87%
Power Factor. What is its Wattage?
KEYSTROKE DISPLAY
0.
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KEYSTROKE
1. Set to 1Phase:
(1Ø)
2. Enter Volts:
3. Set Power Factor:
(PF%)
4. Enter Amps:
5. Solve for Watts:
DISPLAY
1 Ø 1 PH
VOLT 120.
PF% 87.
AMPS 45.
WATT 4,698.
Finding kW Rating
What’s the kW rating for a 90 Amp, 208 Volt, ThreePhase boiler with
100% Power Factor?
KEYSTROKE DISPLAY
0.
1. Set to 3Phase:
(3Ø)
2. Set Power Factor:
(PF%)
3. Enter Amps:
3Ø 3 PH
PF% 100.
AMPS 90.
4. Enter Volts:
VOLT 208.
5. Solve for kW:
KW 32.423991
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OHM’S LAW
The ElectriCalc Pro ’s builtin Ohm’s Law functions allow you to easily solve for Voltage (Volts), Current (Amps), or Resistance (Ohms) by entering in any two variables (e.g, Volts and Amps) and solving for the third (e.g., Ohms).
Ohm’s Law: V = I x R
The Ohm’s Law functions on the ElectriCalc Pro are identified as follows:
• Vdc = Voltage, in Volts
• Idc = Current, in Amps
• R = Resistance, in Ohms
Finding Volts
The Current in a circuit is 0.0125 Amps, and the total Resistance is
480 Ohms. Find the Voltage.
KEYSTROKE DISPLAY
0.
1. Enter Current:
(Idc)
2. Enter Resistance:
(R)
3. Find Voltage:
(Vdc)
Idc 0.0125
A
OHMS 480.
Vdc 6.
V
Finding Amps
A 120k electrical resistor is plugged into a 12 volt circuit. Find the
Current (in Amps).
KEYSTROKE DISPLAY
0.
1. Enter Resistance:
(R) KOHM 120.
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KEYSTROKE DISPLAY
2. Enter Voltage:
(Vdc)
3. Find Current:
(Idc)
Finding Resistance (Ohms)
Vdc 12.
V
Idc 0.0001
A
An electrical circuit operating at 240 Volts has a Current of 14.6
Amperes. Find the total Resistance (in Ohms) of the circuit.
KEYSTROKE DISPLAY
0.
1. Enter Voltage:
(Vdc)
2. Enter Current:
(Idc)
3. Find Resistance:
(R)
Vdc 240.
V
Idc 14.6
A
OHMS 16.438356
MOTOR FUNCTIONS
The ElectriCalc Pro can calculate the FullLoad Current (Amps) of a motor, based on Phase, Voltage and Motor (Synchronous, Induction, or DC) Horsepower. It uses NEC Tables 430.247, 430.248 and
430.250 to determine the motor FullLoad current. (If you enter a value for HP or Voltage that does not correspond to these tables, the unit will display nonE ).
The ElectriCalc Pro can also calculate an equivalent Horsepower for an Induction, Synchronous or Direct Current motor based on a
Voltage, Phase and FullLoad Current. When calculating Motor HP from an entered Amperage, a result not directly matching a value in
NEC Table 430.247, 430.248 or 430.250 will cause the calculator to choose the next higher table value for Motor Horsepower.
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Finding SinglePhase FullLoad Current
A 2 HP Induction motor operates on 230 Volt, SinglePhase power.
What is the FullLoad Current for this motor?
KEYSTROKE DISPLAY
0.
1. Set to 1Phase:
(1Ø)
2. Enter Volts:
1 Ø 1 PH
VOLT 230.
3. Enter HP:
IND* 2. HP
* If IND is not shown, press until IND is displayed in the upper left area of the display.
4. Find FullLoad Current:
FLC 12.
A
Finding Motor Wire Size and Ampacity
Find the Wire Size required to connect a continuous run, 3Ø, 10 HP
Induction motor into a 230V circuit.
KEYSTROKE DISPLAY
0.
1. Set to 3Phase:
(3Ø) 3Ø 3 PH
2. Set to 60º C:
(60º)
3. Set to Copper (if necessary):
(Cu/Al)
4. Enter Volts:
3Ø 60 3 PH
3Ø 60 Cu 3 PH
VOLT 230.
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KEYSTROKE
6. Find FullLoad Current:
DISPLAY
5. Enter HP:
IND* 10. HP
* If IND is not shown, press until IND is displayed in the upper left area of the display.
FLC 28.
A
7. Find 125% Ampacity Wire Size:
(125%) AWG 8 CU WIRE SIZE 125%
8. Find max Ampacity:
8* 40.0
WIRE A125%
* The Wire Size will be shown in the upper left area of the display when displaying the Wire Ampacity rating.
Finding Synchronous Motor Horsepower
A Synchronous motor is defined as having a 27 Amp load on a 240
Volt, 3Ø circuit. What is its Horsepower?
KEYSTROKE DISPLAY
0.
1. Set to 3Phase:
(3Ø) 3Ø 3 PH
2. Set to Synchronous motor:
*(Ind/Sync/DC) SYNC 0.
* If necessary, continue pressing until the desired Motor Type is displayed.
3. Enter Volts:
VOLT 240.
4. Enter Amps:
AMPS 27.
(cont’d)
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(cont’d)
KEYSTROKE DISPLAY
5. Solve for HP:
SYNC 25. HP
6. Set to Induction motor:
(Ind/Sync/DC)
Finding Direct Current Motor Horsepower
IND 0.
A Direct Current motor is defined as having a 10 Amp load on a 180
Volt circuit. What is its Horsepower?
KEYSTROKE
DISPLAY
0.
1. Set to DC motor:
*(Ind/Sync/DC) DC 0.
* If necessary, continue pressing until the desired Motor Type is displayed.
2. Enter Volts:
VOLT 180.
3. Enter Amps:
AMPS 10.
4. Solve for HP:
DC 2. HP
5. Set to Induction motor:
(Ind/Sync/DC) IND 0.
AMPACITY WIRE SIZING
The required Wire Size of a service conductor can be determined based on the specified electrical requirements and the key. The
Wire Size is automatically recalculated whenever the Wire Insulation
(temperature) ratings or Wire material (Copper or Aluminum) types are revised. Wire Sizing is based on the requirements defined in NEC
Tables 310.15(B)(16) and 310.15(B)(17).
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Wire Sizing Based on Insulation Rating
Wiring is being installed in a 240 Volt, SinglePhase system rated at
30 kVA. What is the Wire Size needed if you use 60° C Copper wire?
KEYSTROKE DISPLAY
0.
1. Set to 1Phase:
(1Ø) 1 Ø 1 PH
2. Set to 60º C:
(60º)
3. Set to Copper (if necessary):
(Cu/Al)
4. Enter kVA:
1 Ø 60 1 PH
1 Ø 60 Cu 1 PH
KVA 30.
5. Enter Volts:
VOLT 240.
6. Find Amps:
AMPS 125.
7. Find Wire Size:
AWG 0 CU WIRE SIZE
8. Display Wire Ampacity:
Ø* 125.0
WIRE A
* The Wire Size will be shown in the upper left area of the display when displaying the Wire Ampacity rating.
9. Display CMIL:
CMIL 105,600. WIRE
10. Display NEC Table:
NEC 310.15.b.16
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ReSizing Wire Based on Different Insulation Ratings
What Wire Size is required for a 3Ø, 75°C Copper branch circuit carrying a load of 260 Amps? What would the Wire Size be if 90°C Copper is used?
KEYSTROKE DISPLAY
0.
1. Set to 3Phase:
(3Ø) 3Ø 3 PH
2. Set to 75º C:
(75º)
3. Set to Copper (if necessary):
(Cu/Al)
4. Enter Amps:
3Ø 75 3 PH
3Ø 75 Cu 3 PH
AMPS 260.
5. Find Wire Size:
AWG 300 CU WIRE SIZE
6. Change to 90º C:
(90º) 3Ø 90 Cu AWG 0000 CU WIRE SIZE
Wire Sizing Based on Ambient Temperature
Find the 90°C Copper Wire Size needed to connect a 47,700
VoltAmp load to a 240 Volt, SinglePhase source. What is the adjusted Wire Size, if the Ambient temperature rating is changed from the default 30°C to 20°C?
KEYSTROKE DISPLAY
0.
1. Set to 1Phase:
(1Ø) 1 Ø 1 PH
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KEYSTROKE DISPLAY
2. Set to 90º C:
(90º)
3. Set to Copper (if necessary):
(Cu/Al)
1 Ø 90 1 PH
1 Ø 90 Cu 1 PH
4. Enter VA:
VA 47,700.
5. Enter Volts:
VOLT 240.
6. Find Amps:
AMPS 198.75
7. Find Wire Size:
AWG 000 CU WIRE SIZE
8. Change Ambient temperature:
(Ambº) 1Ø 90 Cu Amb AMB° 20. ºC
9. Find adjusted Wire Size:
AWG 00 CU WIRE SIZE
10. Display Wire Ampacity:
ØØ* 210.6 WIRE A
* The Wire Size will be shown in the upper left area of the display when displaying the Wire Ampacity rating.
11. Display CMIL:
12. Display NEC table:
13. Reset Ambient Temperature and Clear:
CMIL 133,100.
WIRE
NEC 310.15.b.16
1Ø 90 Cu 0.
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Wire Sizing Based on Material Type
Find the Wire Size for a 75°C Copper Wire carrying a 3Ø load of 265
Amps. What is the equivalent Aluminum Wire Size?
KEYSTROKE DISPLAY
0.
1. Set to 3Phase:
(3Ø) 3Ø 3 PH
2. Set to 75º C:
(75º)
3. Set to Copper (if necessary):
(Cu/Al)
4. Enter Amps:
3Ø 75 3 PH
3Ø 75 Cu 3 PH
AMPS 265.
5. Find Wire Size:
AWG 300 CU WIRE SIZE
6. Change to Aluminum:
(Cu/Al) 3Ø 75 Al AWG 400 AL WIRE SIZE
7. Display Wire Ampacity:
4ØØ* 270.0 WIRE A
* The Wire Size will be shown in the upper left area of the display when displaying the Wire Ampacity rating.
8. Display CMIL:
CMIL 400,000. WIRE
9. Display NEC Table:
NEC 310.15.b.16
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Sizing Parallel Conductors
What size 60°C insulated Copper Wire is required for a single conductor carrying a 500 Amp load in a Free Air environment (30°C
Ambient Temperature)? What size for two Parallel conductors? For three conductors?
KEYSTROKE DISPLAY
0.
1. Set to 60º C:
(60º) 60 0.
2. Set to Copper (if necessary):
(Cu/Al)
3. Set to Free Air mode:
(FrAir)
4. Enter Amps:
60 Cu 0.
60 Cu FrAir 0.
AMPS 500.
5. Find Wire Size for one conductor:
AWG 500 CU WIRE SIZE
6. Find Wire Size for two conductors:
PAR 000 CU WIRE SIZE
7. Find Wire Size for three conductors:
PAR 0 CU WIRE SIZE
8. Exit Free Air Mode and Clear:
60 Cu
0.
Note: Parallel Wire Sizes smaller than 1/0 will be displayed as nonE .
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Finding Derated Wire Size
What is the Derated Wire Size required for nine 75°C Copper wires, each carrying a maximum load of 65 Amps?
KEYSTROKE DISPLAY
0.
1. Set to 75º C:
(75º)
2. Set to Copper (if necessary):
(Cu/Al)
3. Enter Amps:
75 0.
75 Cu 0.
AMPS 65.
4. Find normal Wire Size:
AWG 6 CU WIRE SIZE
5. Find Derated Wire Size:
(D/R Size)
6. Display Wire Ampacity:
D/R 3 CU WIRE SIZE
D/R 45.5 WIRE A
7. Display Adjustment Factor:
ADJ 70. %
8. Display NEC Table:
Sizing TemperatureAdjusted Derated Wires
NEC 310.15.b.3
A circuit was built with 60°C Copper wire connecting a 47,650 Volt
Amp load to a 240 Volt, ThreePhase source. Ambient Temperature is 50°C. What is the Derated Wire Size required if eight currentcarrying THHN wires are installed in the raceway?
KEYSTROKE DISPLAY
0.
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KEYSTROKE
1. Set to 3Phase:
(3Ø)
2. Set to 60º C:
(60º)
3. Set to Copper (if necessary):
(Cu/Al)
4. Enter VoltAmps:
DISPLAY
3Ø
3 PH
3Ø 60 3 PH
3Ø 60 Cu 3 PH
VA 47,650.
5. Enter Volts:
7. Find Adjusted Wire Size:
VOLT 240.
6. Set to 50º C Ambient Temperature:
(Ambº) 3Ø 60 Cu Amb AMB° 50. ºC
AWG 250 CU WIRE SIZE
8. Find Derated Wire Size:
(D/R Size)
9. Display Wire Ampacity:
D/R 500 CU WIRE SIZE
D/R 46.5 WIRE A
10. Display Adjustment Factor:
ADJ 41. %
11. Display NEC Table:
NEC 310.15.b.3
12. Reset Ambient Temperature and Clear:
3Ø 60 Cu 0.
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VOLTAGE DROP
The reduction in Voltage between the power source and the load can be determined by entering the Phase, Volts, Amps,
Wire material, Voltage Drop Wire Size and Length of run.
The calculator determines Resistance and then the Voltage reduction. Voltage Drop can be displayed as Volts dropped, or as a percent reduction of potential load.
This calculator also finds Voltage Drop Wire Size once you have entered or calculated the Phase, Volts, Amps, Length,
Wire Type, and allowable VD percentage. It will solve for the distance (
) once you have entered or calculated the
Phase, Volts, Amps, Wire Type, Voltage Drop Wire Size, and allowable VD percentage. The ElectriCalc Pro uses Resistance values found in NEC Table 8 Chapter 9 to determine Voltage
Drop.
Note: Voltage Drop solutions may vary slightly from actual AC circuit measurements, as the calculator does not incorporate factors such as inductive reactance, skin effect, raceway material, etc. In most situations, the DC Voltage Drop calculation method is sufficient to meet safety standards for AC systems.
IMPORTANT NOTE ON VOLTAGE
DROP CALCULATIONS
The ElectriCalc Pro calculates Voltage Drop and Wire Size using DC
Resistance as defined by the 2017 NEC. To find the Voltage Drop for a specific Wire Size, you must first enter Amps and the oneway wire Length (and other required variables), entering the specific Wire
Size last. Otherwise, for your safety, the calculator will recalculate the Wire Sizes based on the NEC Ampacity Tables and maximum allowable Voltage Drop.
Finding SinglePhase Voltage Drop
You are installing 175 Feet of 75°C, #8 THW branch circuit Copper conductors to supply an 11A load on a 208V 1Ø system. What is the source Voltage Drop at the load?
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KEYSTROKE
DISPLAY
0.
1. Set to 1Phase:
(1Ø)
2. Set to 75 º C:
(75º)
3. Set to Copper (if necessary):
(Cu/Al)
4. Enter Amps:
1 Ø 1 PH
1 Ø 75 1 PH
1 Ø 75 Cu
1 PH
AMPS 11.
5. Enter Volts:
VOLT 208.
6. Enter Length:
FEET 175.
7. Enter Wire Size:
*
8. Solve Voltage Drop:
AWG 8 CU WIRE SIZE
DROP 3.0 V
9. Solve percent Voltage Drop:
DROP 1.4 % V
* Wire size can also be entered in Circular Mils (e.g.,
enters 16,510 CMILs and displays
8 AWG Wire Size).
Finding ThreePhase Voltage Drop
A 20 Amp, ThreePhase load is being fed by a 230 Volt source located 150 Feet away. The installation specifications require 75°C
#10 THW stranded Copper conductor. What is the Voltage Drop on this branch circuit?
(cont’d)
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(cont’d)
KEYSTROKE
1. Set to 3Phase:
(3Ø)
2. Set to 75 º C:
(75º)
3. Set to Copper (if necessary):
(Cu/Al)
4. Enter Amps:
DISPLAY
0.
3Ø 3 PH
3Ø 75 3 PH
3Ø 75 Cu 3 PH
AMPS 20.
5. Enter Volts:
VOLT 230.
6. Enter Length (Feet):
FEET 150.
7. Enter Wire Size:
AWG 10 CU WIRE SIZE
8. Solve Voltage Drop:
DROP 6.4 V
9. Solve percent Voltage Drop:
DROP 2.8 % V
Finding Voltage Drop Wire Size
A 20 Amp, ThreePhase 208 Volt load will be located 175 Feet away from the source. Assuming a 3% allowable Voltage Drop, what is the size of 75°C conductor required for this branch circuit? What is the resulting voltage drop?
KEYSTROKE DISPLAY
0.
1. Set to 3Phase:
(3Ø)
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3Ø
PH
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KEYSTROKE
2. Set to 75º C:
(75º C)
3. Set to Copper (if necessary):
(Cu/Al)
4. Enter Amps:
DISPLAY
3Ø 75 3 PH
3Ø 75 Cu
3 PH
AMPS 20.
5. Enter Volts:
VOLT 208.
6. Enter Length:
FEET 175.
7. Enter allowable VD%:
DROP 3.0 % V
8. Find Wire Size:
AWG 8 CU VD WIRE SIZE
9. Find actual Voltage Drop:
10. Find percent Voltage Drop:
DROP 2.3 % V
Finding Voltage Drop Distance
How far from a ThreePhase 240 Volt source can you install a 15 Amp load using 60°C #10 Copper branch circuit conductors? Assume a 3% allowable Voltage Drop.
KEYSTROKE
1. Set to 3Phase:
(3Ø)
DROP 4.7 V
DISPLAY
0.
3Ø 3 PH
(cont’d)
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(cont’d)
KEYSTROKE
2 Set to 60º C:
(60º)
3. Set to Copper (if necessary):
(Cu/Al)
4. Enter Amps:
5. Enter Volts:
6. Enter Wire Size:
*
7. Enter 3% allowable Voltage Drop:
8. Find distance:
9. Find actual Voltage Drop:
10. Find percent Voltage Drop:
DISPLAY
3Ø 60 3 PH
3Ø 60 Cu 3 PH
AMPS 15.
VOLT 240.
AWG 10 CU WIRE SIZE
DROP 3.0 % V
FEET 234.86987
DROP 7.2 V
DROP 3.0 % V
* Wire size can also be entered in Circular Mils (e.g.,
enters 10,380 CMILs and displays 10 AWG
Wire Size).
Note: The calculator automatically makes adjustments for Resistance using NEC Chapter 9, Table 8, if the Insulation Type is other than 75°C.
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Finding Voltage Drop Resistance
What is the Resistance of 85 Feet of #2 90° C Copper conductor?
KEYSTROKE DISPLAY
0.
1. Set to 90º C:
(90º) 90 0.
2. Set to Copper (if necessary):
(Cu/Al)
3. Enter Wire Size:
*
90 Cu 0.
AWG 2 CU WIRE SIZE
4. Find Resistance:
(Wire Res)
5. Find 85foot Resistance**:
OHMS 0.2033993 WIRE
0.0172889
* Wire size can also be entered in Circular Mils (e.g.,
enters 10,380 CMILs and displays 10 AWG
Wire Size).
** Given Resistance per 1,000 Feet, divide by 1,000 to get a per
Foot Resistance, then multiply by 85.
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GROUND CONDUCTOR WIRE SIZE
You can use single or multiple service entrance conductor(s) to find the grounding electrode conductor for AC systems. When using multiple conductors, the ElectriCalc Pro uses the equivalent Circular
Mils to find the Grounding electrode conductor (based on NEC
Table 250.66).
Find the Grounding electrode conductor Wire Size required when
2/0 is the largest 3Phase 75°C Copper serviceentrance conductor being used. What is the equivalent Aluminum size? What is the equivalent Circular Mils?
KEYSTROKE DISPLAY
0.
1. Enter Wire Size and find Ground Wire Size:
GRND 4 CU WIRE SIZE
2. Find Aluminum size:
GRND 2 AL WIRE SIZE
3. Find Circular Mils:
CMIL 133,100. WIRE
4. Display NEC Table:
NEC 250.66
* Wire size can also be entered in Circular Mils (e.g.,
enters 133,100 CMILs and displays 4 GRND
Wire Size). If Wire Size is not entered using the key, the calculation will be based on the Wire Size stored in the key.
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EQUIPMENT GROUNDING COUNDUCTOR WIRE SIZE
The
keystroke can be used to find the Grounding conductor size for raceways and “overcurrent devices in circuit ahead” equipment. The calculator assumes the displayed value as
Amperage to solve for the Equipment Grounding conductor based on NEC Table 250.122.
Find the Equipment Grounding conductor size required when the circuit breaker is rated at 45 Amps. What is the equivalent
Aluminum size?
KEYSTROKE
DISPLAY
0.
1. Find Equipment Ground Wire Size:
(EqGrnd)
2. Find Aluminum size:
EQPG 10 CU WIRE SIZE
EQPG 8 AL WIRE SIZE
3. Display NEC Table:
NEC 250.122
FUSE AND CIRCUIT BREAKER SIZE
Fuse and Breaker sizing is determined by NEC Table 430.52.
Once the Motor Type is defined via
L
, a FullLoad
Current amperage value can be used to find the Fuse Breaker Sizes.
What is the calculated Dual Element and Single Element Fuse size for a 230 Volt, 3Phase, 50 HP Induction motor? What are the Instantaneous Trip and Inverse Time Circuit
Breaker requirements?
KEYSTROKE
DISPLAY
0.
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(cont’d)
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(cont’d)
KEYSTROKE
1. Set to 3Phase:
(3Ø)
2. Enter Volts:
DISPLAY
3Ø
3 PH
VOLT 230.
3. Enter HP:
IND* 50. HP
* If IND is not shown, press until IND is displayed in the upper left area of the display.
4. Find FullLoad Current:
5. Find Dual Element Fuse size:
FLC 130. A
AMPS 227.5 dE
6. Display percent used:
7. Find Single Element Fuse size:
(SEFuse)
8. Display percent used:
%FLC 175. %
AMPS 390. SE
%FLC 300.
%
9. Find Inverse Time Circuit Breaker size:
10. Display percent used:
AMPS 325. b2
%FLC 250.
%
11. Find Instantaneous Trip Circuit Breaker size:
(InsTrip)
12. Display percent used:
AMPS 1,040. b1
%FLC 800.
%
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STARTER SIZE
What NEMA size Starter is required for a 575 Volt, 3Ø, 20 HP
Induction motor?
KEYSTROKE
DISPLAY
0.
1. Set to 3phase:
(3Ø)
2. Enter Volts:
3Ø 3 PH
4. Solve for Starter Size:
(Starter)
VOLT 575.
3. Enter HP:
IND* 20. HP
* If IND is not shown, press until IND is displayed in the upper left area of the display.
STAR SIZE 2
OVERLOAD PROTECTION SIZE
What Overload Protection device size is required for an Induction motor with a nameplate Current rating of 19.2 Amps and a 1.0 service factor? What is the required Overload rating at 125% (for a
1.15 service factor)?
KEYSTROKE
1. Enter nameplate Current:
DISPLAY
0.
AMPS 19.2
2. Find Overload size:
AMPS 22.08 o l
3. Display percent used:
%FLC 115. %
(cont’d)
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(cont’d)
KEYSTROKE
4. Find 125% Load:
5. Display percent used:
6. Reset Overload rating and Clear:
DISPLAY
AMPS 24. o l
%FLC 125.
%
0.
CONDUIT SIZE
The ElectriCalc Pro can calculate the size of Conduit required when running single or multiple Wires using the
key and the calculator’s internal tables. The calculator uses NEC values for area of THW/THHW, XHH/XHHW, and THHN/THWN wires. When using the actual Wire areas (and following the guidelines in NEC Chapter
9, Tables 1, 4 and 5), the calculator can calculate a Conduit Size based on the Conduit Type and the same or different Wire Types and Sizes.
To select a specific Conduit Type, enter the corresponding number of the Conduit as shown below and then press
.
The types and their corresponding numbers are:
1) EMT
2) ENT
4) IMC
5) LFNB
7) LFMC
8) RMC
10) P40
11) PA
3) FMC 6) LFNA 9) P80 12) PEB
When you enter a new Conduit Type or scroll through the types, you will see the updated Conduit Size (if you have entered the
Wire Type and quantity).
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Finding Motor BranchCircuit Wire Size and Conduit Size —
Same Wire Type and Size
What size THHN Copper Wire and RMC Conduit are needed to connect a 10 HP 1Ø Induction motor to a 115 Volt source?
KEYSTROKE DISPLAY
0.
1. Set to 1Phase:
(1Ø)
2. Set to 60º C:
(60º)
1 Ø
1 PH
1 Ø 60
1 PH
3. Set to Copper (if necessary):
(Cu/Al)
4. Enter Volts:
1 Ø 60 Cu 1PH
VOLT 115.
5. Enter Horsepower:
IND* 10. HP
* If IND is not shown, press until IND is displayed in the upper left area of the display.
6. Display FullLoad Amps:
FLC 100. A
7. Find Wire Size at 125% Ampacity:
(125%) AWG 0 CU WIRE SIZE 125%
8. Find Wire Ampacity:
Ø* 125.0 WIRE A 125%
* The Wire Size will be shown in the upper left area of the display when displaying the Wire Ampacity rating.
9. Enter Conduit Type and find Conduit Size:
(Cond Type) RMC 1.25 in COND SIZE
(cont’d)
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(cont’d)
KEYSTROKE DISPLAY
10. Find total number of Wires:
2. TTL WIRES
11. Find Conduit Fill Percent:
FILL 24.3
% COND
12. Find actual Fill Area:
FILL 0.3710
TTL WIRE AREA
13. Find Remaining Area:
REM 0.1021
WIRE AREA
Note: If a Wire Size has been calculated or stored, and the Wire Type/ quantity is not defined, the calculator will assume 2 THHN wires for
1Ø and 3 THHN wires for 3Ø when calculating Conduit Size.
Finding Conduit Sizes For Multiple Conductors —
Same Wire Type and Size
Find the minimum IMC Conduit Size for eleven #6 THHN Copper wires.
KEYSTROKE DISPLAY
0.
1. Set to Copper (if necessary):
(Cu/Al)
2. Enter Conduit Type:
(Cond Type)
3. Enter Wire Size:
*
Cu 0.
IMC nonE COND
AWG 6 CU WIRE SIZE
4. Enter # THHN:
THHN 11. WIRES
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KEYSTROKE DISPLAY
5. Find Conduit Size:
IMC 1.25 in COND SIZE
* Wire Size can also be entered in Circular Mils (e.g.,
enters 26,420 CMILs and displays 6 AWG
Wire Size).
Finding Number of Wires in Existing Conduit —
Same Size, Various Types
Find the maximum number of #10 THHN Copper wires that can be pulled through an existing 3 inch EMT Conduit. How many XHHW wires? How many THW wires?
KEYSTROKE DISPLAY
0.
1. Set to Copper (if necessary):
(Cu/Al)
2. Enter Conduit Type:
(Cond Type)
Cu 0.
EMT nonE COND
3. Enter Wire Size:
* AWG 10 CU WIRE SIZE
4. Enter Conduit Size:
EMT 3.00 in COND SIZE
5. Find maximum THHN #:
THHN 167. TTL WIRES
6. Find maximum XHHW #:
XHHW 145. TTL WIRES
7. Find maximum THW #:
THW 145. TTL WIRES
* Wire Size can also be entered in Circular Mils (e.g.,
enters 10,380 CMILs and displays 10 AWG
Wire Size).
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Finding Conduit Size —
Multiple Conductors, Different Wire Sizes and Types
Three 1/0 THWN 75°C conductors and one #2 XHHW 75°C Copper conductor are to connect to a panel board using a single Conduit.
What is the crosssectional area of Wires, Conduit Size and actual fill Area?
Note : The crosssectional Areas are the same for both THHN and
THWN; display will show as THHN.
KEYSTROKE DISPLAY
0.
1. Set to 75º C:
(75º) 75 0.
2. Set to Copper (if necessary):
(Cu/Al)
3. Enter Conduit Type:
(Cond Type)
4. Enter first Wire Size:
*
75 Cu 0.
FMC nonE COND
AWG 0 CU WIRE SIZE
5. Enter number of THWN Wires:
THHN 3. WIRES
6. Find crosssection Wire Area:
THHN 0.5565 WIRE AREA
7. Enter second Wire Size:
* AWG 2 CU WIRE SIZE
8. Enter number of XHHW Wires:
9. Find crosssectional Wire Area:
XHHW 1. WIRE
XHHW 0.1146 WIRE AREA
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KEYSTROKE
10. Find Conduit Size:
11. Find total number of Wires:
12. Find Conduit Fill Percent:
13. Find actual Fill Area:
14. Find Remaining Area:
DISPLAY
FMC 1.50 in COND SIZE
4. TTL WIRES
FILL 36.1 % COND
FILL 0.6711
TTL WIRE AREA
REM 0.0721
WIRE AREA
* Wire size can also be entered in Circular Mils (e.g.,
5 enters 105,600 CMILs and displays 0 AWG
Wire Size; enters 66,360 CMILs and displays 2
AWG Wire Size).
CONVERTING KILOWATTHOUR AND BTU
Find the equivalent BTU rating of a 3.5 kilowatthour rated furnace.
KEYSTROKE
1. Enter kilowatt hours:
DISPLAY
0.
3.5
2. Find equivalent BTU:
(Kwhr ► Btu) BTU 11,953.552
What is the kilowatthour rating for a 4,500 BTU heater?
KEYSTROKE
DISPLAY
0.
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(cont’d)
KEYSTROKE
1. Enter BTU rating:
2. Find equivalent kilowatt hours:
(Btu ► Kwhr)
DISPLAY
4,500.
KWH 1.3176
PARALLEL RESISTANCE
Find the equivalent Resistance for 10 Ohm, 20 Ohm, and 50 Ohm resistors placed in parallel.
KEYSTROKE
DISPLAY
0.
1. Enter first Resistor:
(Par Res) PRS 10.
2. Enter second Resistor:
(Par Res) PRS 6.6666667
3. Enter third Resistor:
(Par Res) PRS 5.8823529
Note: The total is recalculated with each additional Resistor value entered.
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APPENDIX A — DEFAULT SETTINGS
After a Clear All ( ), your calculator will return to the following settings:
STORED VALUES
Insulation Rating
Wire Type Rating
Phase
DEFAULT VALUE
60º C
Copper
3Ø
30º C (86º F) Ambient Temperature
Volts
Voltage Drop %
Power Factor %
Efficiency %
Motor Type
240V
3%
100%
100%
Induction
Conduit Type
Fuse/Breaker Motor Type
EMT
Squirrel Cage non Design E
Overload FLC% 115%
Free Air Mode* Off
* This setting will also return to its default upon turning the calculator off and back on.
If you replace your batteries or perform a Full Reset* (Press
, hold down
and press
) your calculator will return to the following settings (in addition to those listed above):
PREFERENCE SETTINGS DEFAULT VALUE
NEC Code
Ambient Tempurature Units
Length Units
2017
°C
FEET
* Depressing the Reset button located below the perform a Full Reset.
key will also
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APPENDIX B – PREFERENCE SETTINGS
The ElectriCalc Pro has Preference Settings that allow you to set calculator modes. If you replace your batteries or perform a Full
Reset* (press , hold down , and press ), your calculator will return to the following settings (in addition to those listed on the previous page), with the default setting for each preference listed first:
* Depressing the Reset button located below the form a Full Reset.
key will also per
PREFERENCE OPTIONS
1) NEC Code – 2017: Sets the calculator to 2017 NEC
Code Year
– 2014: Sets the calculator to 2014 NEC
Code Year
– 2011: Sets the calculator to 2011 NEC
Code Year
– 2008: Sets the calculator to 2008 NEC
Code Year
– 2005: Sets the calculator to 2005 NEC
Code Year
– 2002: Sets the calculator to 2002 NEC
Code Year
– 1999: Sets the calculator to 1999 NEC
Code Year
– 1996: Sets the calculator to 1996 NEC
Code Year
2) Ambient
Temperature
Units
– °C: Ambient Temperature is stored and displayed as °C.
– °F: Ambient Temperature is stored and displayed as °F.
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3) Length Units – FEET: Length values stored or calculated using the key are displayed as Feet.
– METERS: Length values stored or calculated using the key are displayed as Meters.
APPENDIX C — 2017 NEC REFERENCES
Table 250.66
Table 250.122
Table 310.15(B)(2)(a)
Table 310.15(B)(3)(a)
Table 310.15(B)(16)
Table 310.15(B)(17)
Chapter 9, Tables 1, 4, 5 and 8
Table 430.247
Table 430.248
Table 430.250
Table 430.52
Appendix C
National Electrical Code ® and NEC ® are registered trademarks of the National Fire Protection Association, Inc.,
Quincy, MA 02269.
All listed table references are based on NEC 2017. Previous code years may have different table references.
APPENDIX D — CARE INSTRUCTIONS
Please follow the guidelines listed in this section for proper care and operation of your calculator. Not following the instructions listed below may result in damage not covered by your warranty. Refer to the Warranty section on page 61 for more details.
Do not expose calculator to temperatures outside the operating temperature range of 32ºF – 104ºF (0ºC – 40ºC).
Do not expose calculator to high moisture such as submersion in water, heavy rain, etc.
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APPENDIX E — ACCURACY/ERRORS, AUTO
SHUTOFF, BATTERIES, RESET
ACCURACY/ERRORS
Accuracy/Display Capacity — Your calculator has an eightdigit display. You may enter or calculate values up to 99,999,999. Each calculation is carried out internally to 12 digits.
Errors — When an incorrect entry is made, or the answer is beyond the range of the calculator, an error message will display. To clear an error condition, press the
button once. At this point, you can determine what caused the error and rekey the problem.
Error Codes
DISPLAY
OFLO
ENT Error
ERROR TYPE
Overflow; answer too large to display
Invalid entry
POWR Error nonE
HP Error
FULL Error
EROM Error
MATH Error
Power Factor (PF) or Efficiency (EFF) calculated above 100%
Conduit Size beyond limits of table
Unable to calculate Voltage Drop Wire Size
(Amps/Length too high)
Temperature setting out of range for
Wire calculation
Invalid Horsepower entry per NEC table
Entered or calculated more than 10 different
Wire Sizes
Bad EPROM
Math error (i.e., divide by zero)
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AUTO SHUTOFF
Your calculator is designed to shut itself off after about 812 minutes of nonuse.
BATTERY
The ElectriCalc Pro uses one CR2016 battery. Should your calculator display become dim or erratic, replace the battery.
NOTE: Please use caution when disposing of your old battery as it contains hazardous chemicals.
Replacement batteries are available at most discount or electronics stores. You may also call Calculated Industries at
17758854900 or go to www.calculated.com.
Battery Replacement Instructions
While the calculator is off, turn the calculator over and use a
#1 Phillips screwdriver to remove the battery holder screw located near the center at the top. With the screw removed, pull battery holder out, remove old battery, and slide new battery into holder.
The negative side of the battery should be facing you as you insert the battery holder into the calculator. Replace screw using a
#1 Phillips screwdriver.
RESET
If your calculator should ever “lock up,” press Reset — a small hole located below the
key — to perform a total reset.
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REPAIR AND RETURN
RETURN GUIDELINES
1. Please read the Warranty in this User’s Guide to determine if your Calculated Industries product remains under warranty before calling or returning any device for evaluation or repairs.
2. If your product won’t turn on, check the battery as outlined in the User’s Guide.
3. If you need more assistance, please go to the website listed below.
4. If you believe you need to return your product, please call a
Calculated Industries representative between the hours of
7 a.m. to 4 p.m. Pacific Time for additional information and a
Return Merchandise Authorization (RMA).
Call Toll Free: 18008548075
Outside USA: 7758854900 www.calculated.com/warranty
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WARRANTY
Warranty Repair Service – U.S.A.
Calculated Industries (“CI”) warrants this product against defects in materials and workmanship for a period of one (1) year from the date of original consumer purchase in the U.S. If a defect exists during the warranty period, CI at its option will either repair (using new or remanufactured parts) or replace (with a new or remanufactured calculator) the product at no charge.
THE WARRANTY WILL NOT APPLY TO THE PRODUCT IF IT
HAS BEEN DAMAGED BY MISUSE, ALTERATION, ACCIDENT,
IMPROPER HANDLING OR OPERATION, OR IF
UNAUTHORIZED REPAIRS ARE ATTEMPTED OR MADE. SOME
EXAMPLES OF DAMAGES NOT COVERED BY WARRANTY
INCLUDE, BUT ARE NOT LIMITED TO, BATTERY LEAKAGE,
BENDING, A BLACK “INK SPOT” OR VISIBLE CRACKING OF
THE LCD, WHICH ARE PRESUMED TO BE DAMAGES
RESULTING FROM MISUSE OR ABUSE.
To obtain warranty service in the U.S., please go to the website.
A repaired or replacement product assumes the remaining warranty of the original product or 90 days, whichever is longer.
NonWarranty Repair Service – U.S.A.
Nonwarranty repair covers service beyond the warranty period, or service requested due to damage resulting from misuse or abuse.
Contact Calculated Industries at the number listed above to obtain current product repair information and charges. Repairs are guaranteed for 90 days.
Repair Service – Outside the U.S.A.
To obtain warranty or nonwarranty repair service for goods purchased outside the U.S., contact the dealer through which you initially purchased the product. If you cannot reasonably have the product repaired in your area, you may contact CI to obtain current product repair information and charges, including freight and duties.
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Disclaimer
CI MAKES NO WARRANTY OR REPRESENTATION, EITHER
EXPRESS OR IMPLIED, WITH RESPECT TO THE PRODUCT’S
QUALITY, PERFORMANCE, MERCHANTABILITY, OR FITNESS
FOR A PARTICULAR PURPOSE. AS A RESULT, THIS PRODUCT,
INCLUDING BUT NOT LIMITED TO, KEYSTROKE PROCEDURES,
MATHEMATICAL ACCURACY AND PREPROGRAMMED
MATERIAL, IS SOLD “AS IS,” AND YOU THE PURCHASER
ASSUME THE ENTIRE RISK AS TO ITS QUALITY AND
PERFORMANCE.
IN NO EVENT WILL CI BE LIABLE FOR DIRECT, INDIRECT,
SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
RESULTING FROM ANY DEFECT IN THE PRODUCT OR ITS
DOCUMENTATION.
The warranty, disclaimer, and remedies set forth above are exclusive and replace all others, oral or written, expressed or implied. No CI dealer, agent, or employee is authorized to make any modification, extension, or addition to this warranty.
Some states do not allow the exclusion or limitation of implied warranties or liability for incidental or consequential damages, so the above limitation or exclusion may not apply to you. This warranty gives you specific rights, and you may also have other rights, which vary from state to state.
FCC Class B
This equipment has been certified to comply with the limits for a
Class B calculating device, pursuant to Subpart J of Part 15 of
FCC rules.
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Legal Notes
Software copyrighted and licensed by Calculated Industries, Inc., 2017.
User’s Guide copyrighted by Calculated Industries, Inc., 2017.
ElectriCalc ® Pro is a trademark and Calculated Industries ® is a registered trademark of Calculated Industries, Inc. © 2017.
ALL RIGHTS RESERVED
Designed in the U.S.A.
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Looking for New Ideas
Calculated Industries, a leading manufacturer of specialfunction calculators and digital measuring instruments, is always looking for new product ideas in these areas.
If you have a new product idea, please visit our “Bright Idea” page at www.calculated.com/brightidea.asp. For suggestions about improving this product or other products, please visit us at www.calculated.com under “Contact Us”. Thank You.
4840 Hytech Drive
Carson City, NV 89706 U.S.A.
18008548075 • Fax: 17758854949
Email: [email protected]
www.calculated.com
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CMY
K
MY
CY
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CM
C
M
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Table of contents
 5 KEY DEFINITIONS
 5 Basic Function Keys
 6 Mode Setup Keys
 7 Electrical Keys
 9 Motor Keys
 10 Wire Sizing Keys
 12 Voltage Drop Keys
 13 Grounding Conductor Keys
 14 Fuse/Breaker Keys
 16 Conduit Sizing Keys
 19 PREFERENCE SETTINGS
 20 BASIC MATH OPERATIONS
 20 PERCENT CALCULATIONS
 20 MEMORY OPERATIONS
 21 Using M
 21 Using Memory Storage Keys (M1 M9)
 22 KIRCHHOFF’S LAW
 22 Finding Voltage
 23 Finding Amps
 23 Finding Current Load
 24 Finding Amps From Kilowatts
 24 Finding VoltAmps
 25 Finding kVA Rating
 25 Finding Wattage
 26 Finding kW Rating
 27 OHM’S LAW
 27 Finding Volts
 27 Finding Amps
 28 Finding Resistance (Ohms)
 28 MOTOR FUNCTIONS
 29 Finding SinglePhase FullLoad Current
 29 Finding Motor Wire Size and Ampacity
 30 Finding Synchronous Motor Horsepower
 31 Finding Direct Current Motor Horsepower
 31 AMPACITY WIRE SIZING
 32 Wire Sizing Based on Insulation Rating
 33 ReSizing Wire Based on Different Insulation Ratings
 33 Wire Sizing Based on Ambient Temperature
 35 Wire Sizing Based on Material Type
 36 Sizing Parallel Conductors
 37 Finding Derated Wire Size
 37 Sizing TemperatureAdjusted Derated Wires
 39 VOLTAGE DROP
 39 Finding SinglePhase Voltage Drop
 40 Finding ThreePhase Voltage Drop
 41 Finding Voltage Drop Wire Size
 42 Finding Voltage Drop Distance
 44 Finding Voltage Drop Resistance
 45 GROUND CONDUCTOR WIRE SIZE
 46 EQUIPMENT GROUNDING COUNDUCTOR WIRE SIZE
 46 FUSE AND CIRCUIT BREAKER SIZE
 48 STARTER SIZE
 48 OVERLOAD PROTECTION SIZE
 49 CONDUIT SIZE
 54 CONVERTING KILOWATTHOUR AND BTU
 55 PARALLEL RESISTANCE