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E
LECTRI
C
ALC
COMPLIANT NEC ®
®
P
RO
UPDATEABLE ELECTRICAL CODE CALCULATOR
Model 5065
User’s Guide
Introducing the
ElectriCalc
®
Now NEC
®
Updateable!
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 2005 (and 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 the following:
• Kirchhoff’s Law
• Ohm’s Law
• Volts, Amps, VoltAmps, 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 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!
Table of Contents
Key Definitions . . . . . . . . . . . . . . . . . . . .1
Preference Settings . . . . . . . . . . . . . . . .21
Default Settings . . . . . . . . . . . . . . . . . .22
Basic Math Operations . . . . . . . . . . . . . .23
Percent Calculations . . . . . . . . . . . . . . .23
Memory Operations . . . . . . . . . . . . . . . .24
Kirchhoff’s Law . . . . . . . . . . . . . . . . . . .26
Ohm’s Law . . . . . . . . . . . . . . . . . . . . . .29
Motor Horsepower . . . . . . . . . . . . . . . .31
Ampacity Wire Sizing . . . . . . . . . . . . . .34
Voltage Drop . . . . . . . . . . . . . . . . . . . .41
Ground Conductor Wire Size . . . . . . . . . .47
Equipment Grounding Conductor Wire Size . .
48
Fuse and Circuit Breaker Size . . . . . . . . .49
Starter Size . . . . . . . . . . . . . . . . . . . . .49
Overload Protection Size . . . . . . . . . . . .50
Conduit Size . . . . . . . . . . . . . . . . . . . . .51
Converting KWHR and BTU . . . . . . . . . .56
Parallel Resistance . . . . . . . . . . . . . . . .57
Error Codes . . . . . . . . . . . . . . . . . . . . .58
Battery Information . . . . . . . . . . . . . . . .58
2005 NEC References . . . . . . . . . . . . . .59
Updating Future Code Revisions . . . . . . .60
Settings . . . . . . . . . . . . . . . . . . . . . . . .60
Repair and Return . . . . . . . . . . . . . . . . .61
Warranty . . . . . . . . . . . . . . . . . . . . . . .62
FCC Class B . . . . . . . . . . . . . . . . . . . . .65
Legal Notices . . . . . . . . . . . . . . . . . . . .65
Your ElectriCalc Pro is now updateable for future National Electrical Code ® editions that are updated every three
(3) years. To upgrade your unit, follow the instructions below:
1) Purchase the NEC Update from CI
(see pricing / details from CI’s Web site: www.calculated.com or call form of a chip that contains the new
Code.
2) Once you receive the NEC Update chip, you need to install it in your
ElectriCalc Pro: a) Turn calculator off.
b) As a precaution, remove the battery (located back of calculator, top of unit) by sliding battery door out with your thumbnail. Set aside.
c) Using a screwdriver, pop out the square tab located in the middle section on the back of your calculator.
d) Replace it with the new update tab by inserting it into the slot. e) Replace the battery door. f) Turn calculator on. Your calculator is now updated and ready to use.
Key Definitions
Standard Calculator Functions
o — On/Clear
Turns on power. Pressing once clears the last entry and the display. Pressing twice clears all nonpermanent values.
O — Off
Turns all power off. Clears the Memory and most internal registers.
+  x Ö =
Arithmetic operation keys.
0 1 2 3 4 5 6 7 8 9 ¥
Used for keying in numbers.
% — Percent
Four 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 Function
Used to delete entries one keystroke at a time (unlike the o function, which deletes the entire entry).
S — Second Function
Used with other keys to access secondary functions.
s — Store
Used with function keys to store values.
Displays: STOR
User’s Guide — 1
r — Recall
Recalls 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 value from positive to negative or from negative to positive.
S % — x 2
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 must add a negative value to the cumulative
Memory (e.g., 1 0 s 0 , 5 S , s 0 , r 0 = 5). Clears when the calculator is shut off. r 0 — Memory Recall
Displays the value saved in ( M+).
r r — Display/Clear Memory (MR/C)
Displays and clears the value saved in
( M+).
S r — Clear Memory
Clears the value saved in ( M+) without changing displayed value.
2 — ElectriCalc Pro
s 1 9 — Memory Storage
When pressed after the s key, the 1 through 9 keys will store the displayed values into noncumulative Memory.
r 1

9
Recall M1 – M9.
Mode Setup Functions
S x — Clear All
Clears all values, including Memory.
Resets settings to default values, except preference settings which are retained.
S Ö — Preferences (Prefs)
Use to set default settings or modes
(see “Preference Settings”).
S 1 — SinglePhase (1Ø)
Sets calculator to singlephase mode.
Displays: 1Ø
S 3 — ThreePhase (3Ø)
Sets calculator to threephase mode.
This is the default setting. Displays: 3Ø
S 2
— Ambient Temperature (AMB°)
Permanently enters ambient temperature for determining ampacity derived wire sizes. Ambient temperature will only change when entering a new value or by resetting the calculator. Defaults to 30°C (86°F). Amb will display when the ambient temperature is other than
30°C (86°F). Displays: AMB°
(Cont’d)
User’s Guide — 3
(Cont’d)
NOTE: The temperature units can be displayed in Celsius (°C) or Fahrenheit
(°F) by using the preference function
S Ö .
S 4 — 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 S 4 will change 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 31017 for wire size calculations. Displays: FrAir
S 6 — 60°C Wire Insulation
Sets calculator to 60°C wire insulation type for wire size calculations. This is the default setting. Displays: 60
S 7
— 75°C Wire Insulation
Sets calculator to 75°C insulation type for wire size calculations. Displays: 75
S 9 — 90°C Wire Insulation
Sets calculator to 90°C insulation type for wire size calculations. Displays: 90
4 — ElectriCalc Pro
Electrical Functions
K — kilo
This key is used with Watts, Amps,
Volts, and Voltamps keys to identify
“kilo” values.
S K
— milli
This key sequence is used with Watts,
Amps, Volts, and Voltamps keys to identify “milli” values.
A — Amps
Enters or calculates Amps (using Volts and VA or Watts). Displays: AMPS,
KAMP or mAMP
U — Volts
Enters or calculates Volts (using Amps,
HPth, and VA or Watts). Default value is
240 Volts. Displays: VOLT, KV, or mV
V — VoltAmps
Enters or calculates Voltamps (using
Amps, Volts and Horsepower or Watts).
Displays: VA, KVA, or mVA
W — Watts
Enters 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 DC
Volts and Resistance). Displays: Idc
User’s Guide — 5
S U — DC Volts (Vdc)
Enters or calculates DC Volts (using DC
Amps and Resistance). Displays: Vdc
S V — DC Resistance (R)
Calculates and displays DC resistance in Ohms (using DC Volts and DC Amps).
Displays: R
S W — Power Factor (PF%)
Enters or calculates power factor percentage (based on Watts and VA). Defaults to 100%. Entered or calculated power factors greater than 100% will result in an error. Displays: PF%
H — Horsepower (Theoretical)
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. Displays: HPth
S H — Efficiency (Eff%)
Enters or calculates the percent ratio between real power (Watts) and theoretical Horsepower. Default: 100%. Entered or calculated efficiencies greater than
100% will result in an error.
Displays: EFF%
S ¥ — Kilowatt–Hours to BTU
(Kwhr © Btu) Calculate BTU (British
Thermal Unit) based on an entered
KilowattHour value. Displays: KWH
6 — ElectriCalc Pro
S = — BTU to Kilowatt–Hours
(Btu © Kwhr) Calculate KilowattHours based on an entered BTU (British
Thermal Unit) value. Displays: BTU
S s
— Parallel Resistance
(Par Res) Calculate total resistance based on an entered series of resistance values. Displays: PRS
Motor Horsepower Functions
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 full load current values. Only HP motor and Voltage entries as defined by
NEC Tables 430247, 430248 and 430
250 can be used to determine motor loads.
S 8 — Induction/Synchronous/DC
Motor Toggle (Ind/Sync/DC)
Toggles between induction, synchronous, and direct current motor types. Displays:
IND (induction  default), SYNC (synchronous) 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).
User’s Guide — 7
Ampacity Tables
The ElectriCalc Pro uses NEC Table
31016 (31017 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); and 3) ambient temperature.
Standard AWG wire sizes and Circular
Mils are used by the ElectriCalc Pro.
Wire size entries less than or equal to
2000 are accepted as AWG wire sizes; entries greater than 2000 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 0 key (e.g., 0, 00,
000 and 0000).
w
— 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 ampacity rated wire size.
8 — ElectriCalc Pro
♦ 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.
Displays: CMIL
♦ 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.
Displays: NEC 310.16
S w — 125% Ampacity
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. Displays: 125%
P — 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 are displayed as “none” (display shows “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.
Displays: PAR WIRE SIZE
(Cont’d)
User’s Guide — 9
(Cont’d)
♦ Second Press
Displays the maximum adjusted ampacity of the calculated parallel wire size.
Displays: WIRE A
NOTE: No adjustments are made for deration.
S P — Derated Wire Size (D/R Size)
Used to calculate derated wire sizes and allowable ampacity based on the entered quantity of wires, NEC Table
31016 and NEC Table 31015(b)(2)(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, for example, 4 S P
Displays: D/R WIRE SIZE
♦ Second Press
Displays the maximum adjusted ampacity of the derated wire size.
Displays: D/R WIRE A
♦ Third Press
Displays the derated adjustment factor per the NEC Table 31015(b)(2)(a).
Displays: ADJ %
♦ Fourth Press
Displays the NEC table referenced for the calculation. Displays: NEC 310.15
10 — ElectriCalc Pro
Voltage Drop Solutions
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.
v — 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 (Displays: V DROP
%) or calculates actual Voltage drop
(Displays: V DROP).
♦ Second Press
Calculates actual percent Voltage drop.
Displays: V DROP % l — Length
Enters or calculates the length of a run for Voltage drop calculation.
Displays: FEET or MET
NOTE: Units of length can be set to
Feet or Meters by use of the Preference function S Ö .
User’s Guide — 11
S l — Wire Resistance (Wire Res)
Displays the actual resistance per
1,000 feet of the wire size in w based on NEC Chapter 9, Table 8.
Displays: OHMS WIRE
Ground Function Keys
G — Ground
An outputonly key used to find the grounding electrode conductor size for
AC systems based on NEC Table
25066 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.
Displays: GRND CU WIRE SIZE
♦ Second Press
Displays the aluminum grounding electrode conductor size.
Displays: GRND AL WIRE SIZE
♦ Third Press
Displays the Circular Mil area used to calculate the grounding electrode conductor size. Displays: CMIL WIRE
12 — ElectriCalc Pro
♦ Fourth Press
Displays the NEC table referenced for the calculation. Displays: NEC 250.66
S G
— Equipment Ground (EqGrnd)
This function uses NEC Table 250122 to calculate the minimum equipment grounding conductor size, given an entered amperage rating or setting for a overcurrent device up line (e.g., 300
S G
).
NOTE: This function deviates from the
NEC Table 250122 in that 1250 MCM
AL is used instead of 1200 as specified in NEC Table 250122.
♦ First Press
Displays the copper grounding conductor size for the entered Amp rating.
Displays: EQPG WIRE SIZE CU
♦ Second Press
Displays the aluminum grounding conductor size. Displays: EQPG WIRE SIZE AL
♦ Third Press
Displays the NEC table referenced for the calculation. Displays: NEC 250.122
User’s Guide — 13
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 Full
Load Current” multipliers listed in NEC
Table 43052.
You can also calculate the full Voltage starter size for nonplugging and nonjogging duty motors based on phase,
Voltage, motor HP and NEMA table specifications.
If a parameter is missing or invalid, the calculator will display “nonE.”
S L — Motor Type (MType)
Based on NEC Table 43052, this key 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
( S x ).
♦ First Press
Displays the current motor type. Note there is no motor type in singlephase mode.
14 — ElectriCalc Pro
♦ Second Press
In threephase mode only, subsequent presses of
L will select and display the next motor type from this list: SQC nonB (Squirrel Cage, non
Design B), SQC B (Squirrel Cage,
Design B), SYNC no codE (Synchronous), WND no codE (Wound Rotor).
D
— Dual Element Fuse
♦ First Press
Calculates the minimum Amp rating for a Dual Element Fuse.
Displays: AMPS dE.
♦ Second Press
Displays the fullload current percent multiplier used to determine fuse size.
Displays: %FLC
S D — Single Element Fuse
(SEFuse)
♦ First Press
Displays the minimum Amp rating based on Phase, motor type, and amperage.
Displays: AMPS SE
♦ Second Press
Displays the fullload current percent multiplier value used to determine fuse size. Subsequent presses repeat this cycle. Displays: %FLC
User’s Guide — 15
S I — 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. Displays: AMPS b1
♦ Second Press
Displays the fullload current percent multiplier value used to determine breaker size. Displays: %FLC
I
— Inverse Time Breaker
♦ First Press
Calculates the minimum Amp rating for an Inverse Time Breaker, based on the phase, motor type, and amperage.
Displays: AMPS b2
♦ Second Press
Displays the fullload current percent multiplier value used to determine breaker size. Displays: %FLC
L
— 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 A registers) by 115% or the value you enter.
16 — ElectriCalc Pro
Conforms to NEC Section 43032 (a)(1) value of 115% unless you enter another value. For example, entering 125 L would calculate overload protection based on 125% of the entered amperage.
Displays: AMPS ol
♦ Second Press
Displays the fullload current percent multiplier value used to determine the overload current protection size. Subsequent presses of L repeat the cycle. Displays: %FLC
S h — 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.
Displays: STAR SIZE
NOTE: Horsepower values not identified in NEMA tables will cause the calculator to round up to the next larger starter size in the table.
User’s Guide — 17
Conduit Sizing Keys
The ElectriCalc Pro calculates conduit size using NEC Tables 1, 3, 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: 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 .75, etc.).
, Å , · — 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.
Displays: TTL WIRES (calculated) or
WIRES (entered).
♦ Second Press
Shows total crosssectional area for all entered wires. Displays: WIRE AREA
(entered) or TTL WIRE AREA (calculated).
♦ Third Press
Shows total crosssectional area of all entered wires of the selected wire insulation. Displays: TTL WIRE AREA
18 — ElectriCalc Pro
C
— Conduit Size
Used to find conduit sizes based on the total area of the entered wire types and sizes (up to 15 at one time). If the quantity and insulation type has not been entered, the calculator will assume 2
THHN wires for singlephase or 3 THHN wires for threephase calculations.
♦ First Press
Enters or calculates conduit size.
Displays: COND 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. Displays: TTL WIRES
(calculated) or COND AREA (entered).
NOTE: Third through fifth presses display only for calculated conduit sizes.
♦ Third Press
Shows fill percentage for the calculated conduit size as determined by Table 1,
Chapter 9. Displays: COND FILL %
♦ Fourth Press
Shows the total wire area for all entered wires. Displays: FILL TTL WIRE AREA
(Cont’d)
User’s Guide — 19
(Cont’d)
♦ 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.
Displays: REM WIRE AREA
S C — Conduit Type (Cond Type)
♦ First Press
Displays the currently selected conduit type.
♦ Second Press
Subsequent presses will display and select the next conduit type from this list:
1) EMT
2) ENT
3) FMC
4) IMC
5) LFNB
6) LFNA
7) LFMC
8) RMC
9) P80
10) P40
11) PA
12) PEB
To select a specific conduit type, enter the corresponding number of the conduit and then press S C . If you press this keystroke without entering a number, the calculator will switch to the next conduit type on the list.
20 — ElectriCalc Pro
Preference Settings
Your calculator has the following Preference Settings that you can access and change at any time.
Access the Preference Settings by pressing S Ö . Then, to access each category, press the
Ö key until the desired setting is reached. Within each category, press the
+ or
keys to toggle between individual selections
(note: the
+ will advance, the
will backup).
You can change these settings at any time by repeating the above, and setting in a new preference.
NOTE: To return the Preferences to the default settings, perform a full reset (press
O , hold down x , and press o ), or manually set them back using the keystrokes below.
The Preference Settings are (default settings shown first):
To Set 2005, 2002, 1999, or 1996 NEC code:
S Ö (1st press of Ö ) NEC 2005
+ NEC 1996
+
+
NEC 1999
NEC 2002
User’s Guide — 21
To Set Ambient Temp. to °C or °F:
Ö (2nd press of Ö )
+
AMB° 30 °C
AMB° 86 °F
To Set Length to Feet or Meter:
Ö (3rd press of Ö )
+
FEET 1.
MET 1.
Default Settings
When you first receive your calculator, it is preset to the default settings listed below. You can always return your calculator to these default values by performing a Clear All ( S x ).
Ambient Temperature 30°C
Insulation Rating 60°C
Material
Phase
Copper (Cu)
3Ø
Volts
Efficiency
240 V
100%
Power Factor 100%
Voltage Drop Percent 3%
Wire Environment
(vs Free Air)
Raceway
22 — ElectriCalc Pro
Basic Math Operations
This calculator uses standard chaining logic, which simply means that you enter your first value, the operator ( + ,

, x
,
Ö
), the second value and then the equals sign = .
A.
3 + 2 = 5.
B.
3 2 = 1.
C.
3 x 2 = 6.
D.
3 Ö 2 = 1.5
Percent Calculations
The Percent key
% can be used for finding a given percentage of a number or for working addon, discount or division percentage calculations.
3 5 5 x 1 5 % 53.25
2 5 0 + 6 ¥ 5 %
266.25
2 5  5 %
1 0 0 Ö 5 0 %
23.75
200.
The Percent key also allows you to change percentages to decimals (e.g.,
2 5 % 0.25).
User’s Guide — 23
Memory Operations
Whenever the s 0 keys are pressed, the displayed value will be added to the
Memory. Other Memory functions:
FUNCTION KEYSTROKES
Add to Memory s 0
Subtract from Memory S  s 0
Recall total in Memory r 0
Display/Clear Memory r r
Clear Memory
S r
Memory is semipermanent, clearing only 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 total count of the accumulated values.
Using M+
KEYSTROKES DISPLAY
3 5 5 s 0
2 5 5 s 0
M+ 355.
M+ 255.
7 4 5 S  s 0 M+ – 745.
r 0 r 0 r 0 r r
TTL – 135.
AVG – 45.
CNT 3.
M
M
M
M
M
M
– 135.
24 — ElectriCalc Pro
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 ( s 1
).
To use M2 through M9, replace the presses of the 1 key with presses of the corresponding number key ( 2 through ).
You can replace a value in one of these
Memory registers by storing a new value in place of the stored value.
FUNCTION
Store single value in M1
Clear M1
Recall M1
KEYSTROKES s 1
0 s 1 r 1
Examples:
Store 175 into M1, recall the value, and then clear the value.
KEYSTROKES
1 7 5 s 1
O o r 1
0 s 1
DISPLAY
M1 175.
0.
M1 175.
M1 0.
User’s Guide — 25
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.
Steps Keystrokes Display
Clear calculator o o
Set to 1phase S 1
Enter VA 1 4 6 0 5 V
0.
1 PH
VA 14,605.
Enter Amps 1 1 5 A AMPS 115.
Solve for Volts U VOLT 127.
Finding Amps
What is the current (Amps) for a load drawing 8,250 VoltAmps on a 240 Volt, threephase circuit?
Steps Keystrokes Display
Clear calculator o o
Set to 3phase S 3
Enter VA
Enter Volts
Solve for Amps A
0.
3 PH
8 2 5 0 V VA 8,250.
2 4 0 U VOLT 240.
AMPS 19.846416
26 — ElectriCalc Pro
Finding Current Load
A building with 120/240 Volt 1Ø service has the following loads:
Range = 7,800 VA
Dryer = 5,100 VA
Lighting = 6,470 VA
Heating = 15,100 VA
Appliances = 8,900 VA
What is the service load (Amps) of the circuit supplying this building?
Steps Keystrokes Display
Clear calculator o o
Set to 1phase S 1
Add VA loads: 7 8 0 0 +
1 5 1 0 0 +
Enter as VA
0.
1 PH
5 1 0 0 +
8 9 0 0 +
V
6 4 7 0 = 43,370.
VA 43,370.
Enter Volts 2 4 0 U VOLT 240.
Solve for Amps A AMPS 180.70833
Finding Amps from Kilowatts
What is the amperage for a 75 kW load connected in a 120/208 Volt, 3Ø circuit?
Steps Keystrokes Display
Clear calculator o o
Set to 3phase S 3
Solve for Amps A
0.
3 PH
Enter kilowatts 7 5 K W KW 75.
Enter Volts 2 0 8 U VOLT 208.
AMPS 208.17918
User’s Guide — 27
Finding VoltAmps
What is the VA rating for a 120 Volt, 22
Amp, 1Ø circuit? What is the kVA rating?
Steps Keystrokes Display
Clear calculator o o
Set to 1phase S 1
Enter Volts
Enter Amps
0.
1 PH
1 2 0 U VOLT 120.
2 2 A AMPS 22.
Solve Voltamps V
Solve for kVA K V
VA 2,640.
KVA 2.64
Finding kVA Rating
What is the kVA rating for a 120/208
Volt, threephase, 65 Amp transformer?
Steps Keystrokes Display
Clear calculator o o
Set to 3phase S 3
Enter Volts
Enter Amps
0.
3 PH
2 0 8 U VOLT 208.
6 5 A AMPS 65.
Solve for kVA K V KVA 23.417327
Finding Wattage
A 120 Volt, singlephase, 45 Amp electrical motor has an 87% power factor.
What is its wattage?
Steps Keystrokes Display
Clear calculator o o
Set to 1phase S 1
0.
1 PH
Enter 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.
28 — ElectriCalc Pro
Finding kW Rating
What’s the kW rating for a 90 Amp, 208
Volt, threephase broiler with 100% power factor?
Steps Keystrokes Display
Clear calculator o o
Set to 3phase S 3
Set power factor 1 0 0 S W
Enter Amps
Enter Volts
Solve for kW
0.
3 PH
PF%100.
9 0 A AMPS 90.
2 0 8 U VOLT 208.
K W KW 32.423991
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
User’s Guide — 29
Finding Volts
The current in a circuit is 0.0125 Amps, and the total resistance is 480 Ohms.
Find the Voltage.
Steps Keystrokes Display
Clear calculator o o
Enter current
0.
¥ 0 1 2 5 S A
Idc 0.0125
Enter resistance 4 8 0 S V
OHMS 480.
Find Voltage S U Vdc 6.
Finding Amps
An 120k electrical resistor is plugged into a 12 volt circuit. Find the current (in Amps).
Steps Keystrokes Display
Clear calculator o o
Enter resistance 1 2 0 K S V
0.
Enter Voltage
Find current
KOHM 120.
1 2 S U Vdc 12.
S A Idc 0.0001
Finding Ohms
An electrical circuit operating at 240 Volts has a current of 14.6 Amperes. Find the total resistance (in Ohms) of the circuit.
Steps Keystrokes Display
Clear calculator o o
Enter Voltage 2 4 0 S U
Enter current
0.
Vdc 240.
1 4 ¥ 6 S A
Idc 14.6
Find resistance S V OHMS 16.438356
30 — ElectriCalc Pro
Motor Horsepower
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 430247, 430248 and
430250 to determine the motor full load 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 full load current. When calculating motor HP from an entered amperage, a result not directly matching a value in NEC Table
430247, 430248 or 430250 will cause the calculator to choose the next higher table value for motor Horsepower.
Finding SinglePhase Full Load
Current
A 2 HP induction motor operates on 230
Volt, singlephase power. What is the full load current for this motor?
Steps Keystrokes Display
Clear calculator o o
Set to 1phase S 1
Enter Volts
Enter HP
Find full load Amps A
0.
1 PH
2 3 0 U VOLT 230.
2 h IND 2. HP
FLC 12. A
User’s Guide — 31
Finding Motor Wire Size and
Ampacity
Find the wire size required to connect a continuous run, 3Ø, 3 HP induction motor into a 230V circuit.
Steps Keystrokes Display
Clear calculator o o
Set to 3phase S 3
Enter Volts
Enter HP
0.
3 PH
2 3 0 U VOLT 230.
3 h IND 3. HP
Find load current A
Find 125% A size S w
FLC 9.6 A
AWG 14 CU
WIRE SIZE 125%
Find max ampacity w 14* 20.0
WIRE A125%
*Display will show wire size in the upper left when displaying 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?
Steps Keystrokes Display
Clear calculator o o
Set to 3phase S 3
Set to synch.
Enter Volts
0.
3 PH
S 8 SYNC 0.
2 4 0 U VOLT 240.
Enter Amps
Solve for HP
2 7 A AMPS 27. h SYNC 25. HP
Set to ind. motor S 8 S 8 IND 0.
32 — ElectriCalc Pro
Finding Direct Current Motor
Horsepower
A direct current motor is defined as having a 10 Amp load on a 180 Volt circuit. What is its horsepower?
Steps Keystrokes Display
Clear calculator o o 0.
Set to DC motor S 8 S 8 DC 0.
Enter Volts
Enter Amps
1 8 0 U VOLT 180.
1 0 A AMPS 10.
Solve for HP h
Set to ind. motor S 8
DC 2. HP
IND 0.
User’s Guide — 33
Ampacity Wire Sizing
The required wire size of a service conductor can be determined based on the specified electrical requirements and the w 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 31016 and 31017.
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?
Steps Keystrokes Display
Clear calculator o o
Set to 1phase S 1
Enter kVA
Enter Volts
Find Amps
0.
1 PH
3 0 K V KVA 30.
2 4 0 U VOLT 240.
A
Find wire size w
AMPS 125.
AWG 0 CU
WIRE SIZE
Display Wire
Ampacity
Display CMIL w
0 125.0 Cu WIRE A w CMIL 105,600 WIRE
Display NEC Table w NEC 310.16
34 — ElectriCalc Pro
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?
Steps Keystrokes Display
Clear calculator o o
Set to 3phase
Set to 75°C
Enter Amps
S 3
S 7
260 A AMPS 260.
Find wire size w
0.
3 PH
3Ø 75 Cu 3 PH
AWG 300 CU
WIRE SIZE
Change to 90˚ S 9 AWG 0000 CU
Reset to 60˚
WIRE SIZE
S 6 o 3Ø 60 Cu 0.
and Clear
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 40°C?
Steps Keystrokes Display
Clear calculator o o
Set to 1phase S 1
Set to 90°C
Enter VA
0.
1 PH
S 9 1Ø 90 Cu 1 PH
4 7 7 0 0 V
VA 47,700.
(Cont’d)
User’s Guide — 35
(Cont’d)
Steps Keystrokes Display
Enter Volts
Find Amps
2 4 0 U VOLT 240.
A AMPS 198.75
Find wire size w AWG 000 CU
WIRE SIZE
Change ambient temperature 2 0 S 2 AMB° 20.˚C
Find adjusted wire size w AWG 00 CU
Amb WIRE SIZE
Display Wire w
00 202.8
Ampacity Amb WIRE A
Display CMIL w CMIL 133,100. WIRE
Display NEC Table w NEC 310.16
Reset ambient temperature 3 0 S 2 AMB° 30.˚C
NOTE: See “Settings” on page 62 for a list of Permanent Values/settings.
Changing these settings may affect your calculations.
36 — ElectriCalc Pro
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?
Steps Keystrokes Display
Clear calculator o o
Set to 3phase S 3
Set to 75°C
Enter Amps
0.
3 PH
S 7 3Ø 75 Cu 3 PH
2 6 5 A
AMPS 265.
Find wire size w AWG 300 CU
WIRE SIZE
Change to alum.
S 4 AWG 400 AL
WIRE SIZE
Display Wire w
400 270.0
Ampacity AI WIRE A
Display CMIL w CMIL 400,000 WIRE
Display NEC Table w NEC 310.16
Reset to copper S 4 o 3Ø 75 Cu 0.
and Clear
NOTE: See “Settings” on page 62 for a list of Permanent Values/settings.
Changing these settings may affect your calculations.
User’s Guide — 37
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 amb. temp.)? What size for 2 parallel conductors? For 3 conductors?
Steps Keystrokes Display
Clear calculator o o
Set to 60°C S 6
Find 1 wire size w
0.
3Ø 60 Cu 0
Set free air mode S 5 3Ø 60 FrAir Cu 0.
Enter Amps 5 0 0 A AMPS 500.
AWG 500 CU
FrAir WIRE SIZE
Find 2 wire size 2 P PAR 000 CU
FrAir WIRE SIZE
Find 3 wire size 3 P PAR 0 CU
FrAir WIRE SIZE
Exit Free Air Mode S 5 o 3Ø 60 Cu 0.
and Clear
NOTE: Parallel wire sizes smaller than
1/0 will be displayed as nonE.
NOTE: See “Settings” for a list of
Permanent Values/settings. Changing these settings may affect your calculations.
38 — ElectriCalc Pro
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?
Steps Keystrokes Display
Clear calculator o o
Set to 75°C S 7
Enter Amps
0.
3Ø 75 Cu 0.
6 5 A AMPS 65.
Find normal wire size w AWG 6 CU
WIRE SIZE
Find derated wire size 9 S P
D/R 3 CU
WIRE SIZE
Display Wire P
D/R 45.5
WIRE A Ampacity
Display Adjustment P
Factor
Display NEC Table P
ADJ 70. %
NEC 310.15
NOTE: See “Settings” for a list of
Permanent Values/settings. Changing these settings may affect your calculations.
User’s Guide — 39
Sizing TemperatureAdjusted
Derated Wires
A circuit was built with 60°C copper wire connecting a 47,650 Voltamp load to a
240 Volt, threephase source. Ambient temperature is 50°C. What is the derated wire size required if eight currentcarrying
THHN wires were installed in the raceway?
Steps Keystrokes Display
Clear calculator o o
Set to 60°C S 6
0.
3Ø 60 Cu 0.
Enter Voltamps 4 7 6 5 0 V
Enter Volts
VA 47,650.
2 4 0 U VOLT 240.
Set to 50°C amb 5 0 S 2 AMB° 50. °C
Find adj. wire size w AWG 250 CU
Find derated
Amb WIRE SIZE
8 S P D/R 500 CU wire size
Display Wire P
Amb WIRE SIZE
D/R 46.5
Ampacity
Display Adjust.
P
Factor
Amb WIRE A
ADJ 41. %
Amb
Display NEC Table P
Set to 30°C
NEC 310.15
3 0 S 2 o 0.
and Clear
NOTE: All Settings should be changed back to default to avoid conflicts in answers throughout the rest of this manual. See “Settings” for a list of Permanent
Values/settings. Changing these settings may affect your calculations.
40 — ElectriCalc Pro
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
( l ) 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 is sufficient to meet safety standards.
User’s Guide — 41
IMPORTANT NOTE ON
VOLTAGE DROP CALCULATIONS
The ElectriCalc Pro calculates Voltage drop and wire size using DC resistance as defined by the 2005 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 ‘99 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?
Steps Keystrokes Display
Clear calculator o o
Set to 1phase S 1
Set to 75°C
0.
1 PH
S 7 1Ø 75 Cu 1 PH
1 1 A AMPS 11. Enter Amps
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 SIZE
Solve volt. drop v
Solve % v.drop
v
DROP 3.0 V
DROP 1.4 V %
* Wire size can also be entered in Circular
Mils (e.g., 1 6 5 1 0 w enters
16,510 CMILs and displays 8 AWG wire size).
42 — ElectriCalc Pro
NOTE: See “Settings” for a list of
Permanent Values/settings. Changing these settings may affect your calcula tions.
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?
Steps Keystrokes Display
Clear calculator o o
Set to 75°C S 7
Set to 3phase S 3
Enter Amps
Enter Volts
0.
3Ø 75 Cu 0.
3Ø 75 Cu 3 PH
2 0 A AMPS 20.
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 SIZE
Solve volt. drop v
Solve % v.drop
v
DROP 6.4 V
DROP 2.8 V %
NOTE: See “Settings” for a list of
Permanent Values/settings. Changing these settings may affect your calculations.
User’s Guide — 43
Finding Voltage Drop Wire Size
A 20 Amp, threephase 208 Volt load will be located 175 Feet away from the drop, what is the size of 75°C conductor required for this branch circuit?
Steps Keystrokes
Find actual
Voltage drop v
Find % v.drop
v
Display
Clear calculator o o
Set to 75°C S 7
0.
3Ø 75 Cu 0.
Enter Amps
Enter Volts
2 0 A AMPS 20.
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 SIZE
DROP 4.7 V
DROP 2.3 V %
NOTE: See “Settings” for a list of
Permanent Values/settings. Changing these settings may affect your calculations.
44 — ElectriCalc Pro
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.
Steps Keystrokes Display
Clear calculator o o
Set to 60°C S 6
0.
3Ø 60 Cu 0.
Enter Amps
Enter Volts
1 5 A AMPS 15.
2 4 0 U VOLT 240.
Enter wire size* 1 0 w AWG 10 Cu
Enter 3% VD
Find distance
WIRE SIZE
3 v DROP 3.0 V % l FEET 234.86987
Find actual
Voltage drop v
Find % v.drop
v
DROP 7.2 V
DROP 3.0 V %
* Wire size can also be entered in Circular
Mils (e.g., 1 0 3 8 0 w 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.
See “Settings” for a list of Permanent
Values/settings. Changing these settings may affect your calculations.
User’s Guide — 45
Finding Voltage Drop Resistance
What is the resistance of 85 Feet of #2
90°C copper conductor?
Steps Keystrokes Display
Clear calculator o o
Set to 90°C S 9
Enter wire size* 2 w
0.
3Ø 90 Cu 0.
AWG 2 CU
WIRE SIZE
Find resistance S lOHMS 0.2033993
WIRE
Find 85 ft resist** Ö 1 0 0 0 x
8 5 = 0.0172889
* Wire size can also be entered in Circular
Mils (e.g., 6 6 3 6 0 w enters
66,360 CMILs and displays 2 AWG wire size).
**Given resistance per 1000 Feet, divide by 1000 to get a per Foot resistance, then multiply by 85.
NOTE: See “Settings” for a list of
Permanent Values/settings. Changing these settings may affect your calculations.
Finding DC Resistance
What is the equivalent resistance of a 12
Volt DC circuit pulling 5 Amps?
Steps Keystrokes Display
Clear calculator o o
Enter Voltage
0.
1 2 S U Vdc 12.
Enter Amps 5 S A
Find resistance S V
Idc 5.
OHMS 2.4
46 — ElectriCalc Pro
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 25066).
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?
Steps Keystrokes Display
Clear calculator o o
Set to 3phase
Set to 75º C
S 3
S 7
0.
3 PH
3Ø 75 Cu 3 PH
Enter wire size* 0 0 w AWG 00 CU
WIRE SIZE
Find ground wire G GRND 4 CU size
Find aluminum size G
WIRE SIZE
GRND 2 AL
WIRE SIZE
Find Circular Mils G CMIL 133,100.
WIRE
Display NEC Table G NEC 250.66
* Wire size can also be entered in Circular
Mils (e.g., 1 3 3 1 0 0 w enters
133,100 CMILs and displays 00 AWG wire size).
User’s Guide — 47
Equipment Grounding
Conductor Wire Size
The S G keystroke can be used to find the grounding conductor size for raceways and “overcurrent devices in circuit ahead” equipment. The calculator uses the displayed amperage value to solve for the equipment grounding conductor based on NEC Table
250122.
Find the equipment grounding conductor size required when the circuitbreaker is rated at 45 Amps and 90° copper is being used in the installation.
What is the equivalent aluminum size?
Steps Keystrokes Display
Clear calculator o o
Set to 90º C S 9
0.
3Ø 90 Cu 0.
Enter Amp rating 4 5 A AMPS 45.
Find equipment ground wire size S G EQPG 10 CU
WIRE SIZE
Find aluminum size G EQPG 8 AL
WIRE SIZE
Display NEC Table G NEC 250.122
Reset to 60˚C S 6 o 3Ø 60 Cu 0.
and Clear
48 — ElectriCalc Pro
Fuse and Circuit Breaker Size
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?
Steps Keystrokes Display
Clear calculator o o
Set to 3phase
Enter Volts
Enter HP
S 3
0.
3 PH
2 3 0 U VOLT 230.
5 0 h IND 50. HP
Find full current A FLC 130. A
Find DE fuse size D
Display % used D
AMPS 227.5 dE
%FLC 175.
Find SE fuse size S D AMPS 390. SE
Display % used D
Find inv. time brkr I
Display % used I
%FLC 300.
AMPS 325. b2
%FLC 250.
Find ins. trip breaker size S I AMPS 1,040. b1
Display % used I %FLC 800.
Starter Size
What NEMA size starter is required for a 575 volt, 3Ø, 20 HP induction motor?
Steps Keystrokes Display
Clear calculator o o
Set to 3phase
Enter Volts
Enter HP
S 3
0.
3 PH
5 7 5 U VOLT 575.
2 0 h IND 20. HP
Solve for starter size S h STAR 2 SIZE
User’s Guide — 49
Overload Protection Size
What overload protection device size is required for a 460 Volt, 3phase, 15 HP 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)?
Steps Keystrokes Display
Clear calculator o o
Set to 3phase S 3
0.
3 PH
Enter Volts 4 6 0 U VOLT 460.
Enter Horsepower 1 5 h IND 15. HP
Enter nameplate current 1 9 ¥ 2 A
AMPS 19.2
Find overload size L
Display % used L
AMPS 22.08 ol
%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.
50 — ElectriCalc Pro
Conduit Size
The ElectriCalc Pro can calculate the size of conduit required when running single or multiple wires using the C 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, 3, 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 and then press S C . The numbers and types are:
1) EMT 2) ENT 3) FMC 4) IMC
5) LFNB 6) LFNA 7) LFMC 8) RMC
9) P80 10) P40 11) PA 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).
User’s Guide — 51
Finding Motor BranchCircuit
Wire Size and Conduit Size —
Same Wire Type & Size
What size THHN copper wire and RMC conduit are needed to connect a 10 HP
1Ø induction motor to a 115 Volt source?
Steps Keystrokes Display
Clear calculator o o
Set to 1phase S 1
Set to 60º C
Enter Volts
0.
1 PH
S 6 1Ø 60 Cu 1 PH
1 1 5 U VOLT 115.
Enter Horsepower 1 0 h IND 10. HP
Enter cond. type 8 S C RMC nonE
Display full load
Amps A
Find wire size S w
FLC 100. A
AWG 0 CU
WIRE SIZE 125%
Find wire ampacity w 0 125.0*
WIRE A125%
Find conduit size C RMC 1.25 in
COND SIZE
Find total # wires C
Find conduit fill % C
2. TTL WIRES
FILL 24.3
COND %
Find act. fill area C FILL 0.3710
TTL WIRE AREA
Find rem. area C REM 0.1021
WIRE AREA
Set to 3phase S 3 o 3Ø 60 Cu 0.
and Clear
52 — ElectriCalc Pro
* 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.
Display will also show wire size in upper left when displaying maximum ampacity rating.
NOTE: See “Settings” for a list of
Permanent Values/settings. Changing these settings may affect your calculations.
Finding Conduit Sizes for Multiple
Conductors — Same Wire Type and Size
Find the minimum IMC conduit size for eleven #6 THHN copper wires.
Steps Keystrokes Display
Clear calculator o o 0.
Enter cond. type 4 S C IMC nonE
Enter wire size* 6 w AWG 6 CU
Enter # THHN
WIRE SIZE
1 1 · THHN 11.
WIRES
Find conduit size C IMC 1.25 in
COND SIZE
* Wire size can also be entered in Circular
Mils (e.g., 2 6 2 4 0 w enters
26,240 CMILs and displays 6 AWG wire size).
User’s Guide — 53
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?
Steps Keystrokes Display
Clear calculator o o 0.
Enter cond. type 1 S C EMT nonE
COND
Enter wire size* 1 0 w AWG 10 CU
WIRE SIZE
Enter conduit size 3 C EMT 3.00 in
COND SIZE
Find max THHN # · THHN 167.
TTL WIRES
Find max XHHW# Å XHHW 145.
TTL WIRES
Find max THW # THW 145.
TTL WIRES
* Wire size can also be entered in Circular
Mils (e.g., 1 0 3 8 0 w enters
10,380 CMILs and displays 10 AWG wire size).
54 — ElectriCalc Pro
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.)
Steps Keystrokes Display
Clear calculator o o
Set to 75° S 7
0.
3Ø Cu 75 0.
Enter cond. type 3 S C FMC nonE
COND
Enter 1st wire sz* 0 w AWG 0 CU
WIRE SIZE
Enter #, type wire 3 · THHN 3.
WIRES
Find crosssection wire area · THHN 0.5565
Enter 2nd wire sz* 2 w
WIRE AREA
AWG 2 CU
WIRE SIZE
Enter #, type wire 1 Å XHHW 1.
WIRE
Find crosssect.
Å XHHW 0.1146
WIRE AREA
Find conduit size C FMC 1.50 in
COND SIZE
(Cont’d)
User’s Guide — 55
(Cont’d)
Steps Keystrokes
Find total # wires C
Find conduit fill %
Find actual fill area
Find remaining area
C
C
C
Display
4.
TTL WIRES
FILL 36.1
COND %
FILL 0.6711
TTL WIRE AREA
REM 0.0717
WIRE AREA
* Wire size can also be entered in Circular
Mils (e.g., 1 0 5 6 0 0 w enters
105,600 CMILs and displays 0 AWG wire size; 6 6 3 6 0 w enters 66,360
CMILs and displays 2 AWG wire size).
NOTE: See “Settings” for a list of
Permanent Values/settings. Changing these settings may affect your calculations.
Converting KWHR and BTU
Find the equivalent BTU rating of a 3.5
kwhr rated furnace.
Steps Keystrokes Display
Clear calculator o o
Enter Kilowatt 3 ¥ 5
0.
3.5
Hours
Find Equivalent S ¥ BTU 11,953.552
BTU
56 — ElectriCalc Pro
What is the kwhr rating for a 4,500 BTU heater?
Steps Keystrokes
Clear calculator o o
Enter BTU 4 5 0 0
Rating
Find Equivalent S =
Kilowatt Hours
Display
0.
4,500.
KWH 1.3176
Parallel Resistance
Find the equivalent resistane for 10
Ohm, 20 Ohm, and 50 Ohm resistors placed in parallel.
Steps Keystrokes Display
Clear calculator o o
Enter 1
Enter 2 st nd Resistor 2 0 S s
0.
Resistor 1 0 S s PRS 10.
Enter 3 rd
PRS 6.6666667
Resistor 5 0 S s
PRS 5.8823529
NOTE: The total is recalculated with each additional resistor value entered.
User’s Guide — 57
Error Codes
The error codes for the ElectriCalc Pro are listed below (Note: To clear an error, perform a Clear All S x ):
DISPLAY
OFLO
ERROR DESCRIPTION
Answer too large to display
ENT Error Invalid or outofscale entry
POWR Error PF or EFF calculated above 100% nonE 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 HP entry per NEC table HP Error
FULL Error Entered or calculated more than
15 different wires sizes
EROM Error Bad EROM
MATH Error Math error (i.e., divide by zero)
Battery Information
The calculator is powered by a single
3Volt Lithium CR2032 battery. This should last upwards of 800 hours of actual use (One year plus for most people). If the display becomes very dim or erratic, replace the battery.
NOTE: Please use caution when disposing of your old batteries as they contain hazardous chemicals.
58 — ElectriCalc Pro
Battery Replacement Instructions:
1) Hold calculator upright with back of calculator toward you.
2) Lift battery holder out from the top of the calculator.
3) Remove the old battery.
4) Place new battery with positive side against the bottom of the holder.
5) Insert holder into calculator with positive side of battery facing back of calculator.
2005 NEC References
Table 250.66
Table 250.122
Table 310.15(b)(2)(a)
Table 310.16
Table 310.17
Chapter 9, Table 1, 4, 5 and 8
Section 430.32
Table 430.148
Table 430.150
Table 430.152
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
2005. Previous code years may have different table references.
User’s Guide — 59
Updating Future Code
Revisions
This model is updateable for future
NEC Editions. For information on future codes, contact the dealer where this calculator was purchased or you may contact Calculated Industries, Inc. in the fall of the year prior.
Settings
Permanent Values/Settings
Values and settings maintained in permanent Memory can only be changed
(1) by pressing
S x
(resets calculator to default settings), or (2) by changing each one or all of these settings. The following are permanent values:
(1) Selectable (60°C/75°C/90°C) insulation ratings and CU/AL wire type ratings
(2) Phase setting (1Ø/3Ø)
(3) The entered values for Volts, Voltage Drop %, Power Factor % and
Efficiency %
(4) Ambient Temperature setting
SemiPermanent Values
The following semipermanent values are cleared to default settings when the calculator is shutoff:
(1) Cumulative Memory (M+)
(2) Free Air mode
60 — ElectriCalc Pro
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 will not 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 7:00am and 4:00pm Pacific Time for additional information and a Return
Merchandise Authorization (RMA).
Call Toll Free: 18008548075
Outside USA: 17758854900 www.calculated.com/warranty
User’s Guide — 61
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 DAM
AGED BY MISUSE, ALTERATION, ACCI
DENT, IMPROPER HANDLING OR OPERA
TION, OR IF UNAUTHORIZED REPAIRS
ARE ATTEMPTED OR MADE. SOME
EXAMPLES OF DAMAGES NOT COVERED
BY WARRANTY INCLUDE, BUT ARE NOT
LIMITED TO, BATTERY LEAKAGE, BEND
ING, 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.
62 — ElectriCalc Pro
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 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.
User’s Guide — 63
Disclaimer
CI MAKES NO WARRANTY OR REPRESEN
TATION, EITHER EXPRESS OR IMPLIED,
WITH RESPECT TO THE PRODUCT’S
QUALITY, PERFORMANCE, MER
CHANTABILITY, OR FITNESS FOR A PAR
TICULAR PURPOSE. AS A RESULT, THIS
PRODUCT, INCLUDING BUT NOT LIMITED
TO, KEYSTROKE PROCEDURES, MATHE
MATICAL ACCURACY AND PREPRO
GRAMMED 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 DAM
AGES 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.
64 — ElectriCalc Pro
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.
Legal Notices
Software copyrighted and licensed to Calculated Industries by
Specialty Calculator Technologies,
LLC, 2006.
User’s Guide copyrighted by Calculated
Industries, Inc., 2006.
ElectriCalc® and
Calculated Industries® are registered trademarks of
Calculated Industries, Inc .
4840 Hytech Drive
Carson City, NV 89706 U.S.A.
18008548075 • Fax: 17758854949
Email: [email protected]
www.calculated.com
ALL RIGHTS RESERVED
Designed in the U.S.A.
User’s Guide — 65
Printed in China
04/06
UGL5065EA
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Table of contents
 6 Key Definitions
 26 Preference Settings
 27 Default Settings
 28 Basic Math Operations
 28 Percent Calculations
 29 Memory Operations
 31 Kirchhoff’s Law
 34 Ohm’s Law
 36 Motor Horsepower
 39 Ampacity Wire Sizing
 46 Voltage Drop
 52 Ground Conductor Wire Size
 54 Fuse and Circuit Breaker Size
 54 Starter Size
 55 Overload Protection Size
 56 Conduit Size
 61 Converting KWHR and BTU
 62 Parallel Resistance
 63 Error Codes
 63 Battery Information
 64 2005 NEC References
 65 Updating Future Code Revisions
 65 Settings
 66 Repair and Return
 67 Warranty
 70 FCC Class B
 70 Legal Notices