Calculated Industries ElectriCalc Pro User`s guide

ELECTRICALC® PRO
The ElectriCalc ® Pro is an invaluable
calculator for today’s busy electrical
professional. It has intuitively labeled
“electrical keys” and conforms to 1996
through 2011 and future National
Electrical Codes. The most common
NEC tables are now at your fingertips!
The ElectriCalc ® Pro instantly
solves for:
•
Volts, Amps, Volt-Amps,
Watts, PF%, and EFF%
•
•
Cu and Al Wire Sizes
•
Voltage Drop Wire Sizes, and
Lengths
•
•
•
•
•
•
•
Kilowatt hours and BTU’s
Parallel and Derated Wire
Sizes
Parallel Resistance
Grounding Conductors
Motor FLC
Fuse/Breaker Sizes
Conduit Sizes
And much more!
Pocket Reference Guide — 1
Table of Contents
GETTING STARTED........................... 4
KEY DEFINITIONS...................................4
Basic Function Keys ..............................4
Mode Set-up Keys..................................6
Electrical Keys........................................6
Motor Keys..............................................8
Wire Sizing Keys.....................................8
Voltage Drop Keys..................................9
Grounding Conductor Keys...................10
Fuse/Breaker Keys...............................10
Conduit Sizing Keys.............................. 11
PREFERENCE SETTINGS.....................13
BASIC MATH OPERATIONS.............. 14
PERCENT CALCULATIONS............... 14
MEMORY OPERATIONS........................14
Using M+...............................................15
Using Memory Storage Keys
(M1- M9)...............................................15
using the electricalc pro ....... 15
KIRCHHOFF’S LAW...............................15
Finding Voltage.....................................16
Finding Amps........................................16
Finding Volt-Amps.................................17
Finding kW Rating ................................17
OHM’S LAW............................................18
Finding Volts.........................................18
Finding Amps........................................18
Finding Resistance (Ohms)..................19
MOTOR functions.............................20
Finding Full-Load Current.....................20
Finding Motor Wire Size .......................20
AMPACITY WIRE SIZING.......................21
Wire Sizing............................................21
Wire Sizing Based on Material Type.......22
Sizing Parallel Conductors....................23
Finding Derated Wire Size....................24
VOLTAGE DROP....................................25
Finding Voltage Drop............................25
Finding Voltage Drop Wire Size............26
Finding Voltage Drop Distance.............27
Finding Voltage Drop Resistance..........28
GROUND CONDUCTOR
WIRE SIZE..............................................29
EQUIPMENT GROUNDING
COUNDUCTOR WIRE SIZE...................29
FUSE AND CIRCUIT
BREAKER SIZE......................................30
STARTER SIZE.......................................31
OVERLOAD PROTECTION SIZE...........31
CONDUIT SIZE.......................................32
Finding Motor Branch-Circuit Wire Size
and Conduit Size —
Same Wire Type and Size....................33
Finding Conduit Size —
Multiple Conductors, Different Wire Sizes
and Types.............................................34
CONVERTING KILOWATT-HOUR
AND BTU................................................35
PARALLEL RESISTANCE.......................36
APPENDIX A —
DEFAULT SETTINGS........................... 37
APPENDIX B —
CARE INSTRUCTIONS........................ 38
APPENDIX C —
ACCURACY/ERRORS, AUTO
SHUT-OFF, BATTERIES, RESET......... 39
Repair and Return......................... 42
Pocket Reference Guide — 3
GETTING STARTED
KEY DEFINITIONS
Basic Function Keys

On/Clear Key — Turns on
power, clears the last entry
and clears all temporary
values.

Off — Turns all power off.

Arithmetic operation keys.

 -
and 
Keys used for entering
numbers.

Second Function —
Used to access secondary
functions.

Store — Stores values.

-
Storage Registers —
Store values in Memory.

Recall — Used to recall
stored values and settings.

Memory Clear — Clears
M+ and displays total.

M+ — Adds value to
Accumulative Memory.

Memory Recall —
Displays the value
saved in M+.

Memory Clear (M-R/C)
— Clears M+ without
changing current display.

Percentage — Standard
% function.

x 2 — Squares the value
on the display.

Backspace Function
— Used to delete entries
one keystroke at a time.

! — Calculates the
Square Root of the
displayed value.

1/x — Finds the
Reciprocal of a number.

Clear All — Reset all
settings, other than
preferences to default.

+/– — Toggles sign of
value.

Pi — Displays value of
(3.1415927).
Pocket Reference Guide — 5
Mode Set-up Keys

Prefs — Use to
define calculator modes.

1Ø — Sets calculator to
Single-Phase mode.

3Ø — Sets calculator to
Three-Phase mode.

Amb° — Enters ambient
temperature for finding
Wire Sizes.

Copper/Aluminum
(Cu/Al) — Toggles
between Copper and
Aluminum Wire.

Free Air (FrAir) — Sets
calculator to Free Air
mode.

60°C Wire Insulation —
Sets to 60°C Wire.

75°C Wire Insulation —
Sets to 75°C Wire.

90°C Wire Insulation —
Sets to 90°C Wire.
Electrical Keys

kilo- — Used to identify
“kilo-” values.

milli- — Used to identify
“milli-” values.

Amps — Enters or calculates Amps.

Volts — Enters or
calculates Volts.

Volt-Amps — Enters or
calculates Volt-Amps.

Watts — Enters or
calculates Watts.
  DC Amps (Idc) — Enters
or calculates DC Amps.

DC Volts (Vdc) — Enters
or calculates DC Volts.

DC Resistance (R) —
Enters or calculates DC
Resistance in Ohms.

Power Factor (PF%)
— Enters or calculates
Power Factor.

Theoretical Horsepower
— Enters or calculates
Theoretical Horsepower.

Efficiency (Eff %) —
Enters or calculates the
Power Efficiencies.
(cont’d)
Pocket Reference Guide — 7
(cont’d)

Kw-hr ► Btu —
Converts Kw-hr to Btu.

BTU to Kilowatt–Hours
(Btu ► Kw-hr) —
Converts Btu to Kw-hr.

Parallel Resistance
(Par Res) — Calculates
total Resistance of
Parallel Resistors.
Motor Keys

Ind/Sync/DC — Toggles
between Motor Types.

Motor Horsepower —
Enters or calculates
Motor Horsepower.
  Starter Size (Starter) —
Displays the Starter Size.
Wire Sizing Keys

Wire Size/Ampacity —
Enters or calculates Wire
Size. Additional presses
show smaller wire size
(if Length defined),
Ampacity, Circular Mils,
and referenced table.
  125% Ampacity — Used
to calculate Wire Size
using 125% of Amps.
Also shows Ampacity,
Circular Mils and NEC
table reference with
repeated presses.

Parallel Size — Provides
Wire Sizes using Parallel
Conductors. A second
press displays the
Ampacity.

Derated Wire Size (D/R
Size) — Calculates
Derated Wire Sizes given
a number of wires in the
raceway. Also shows
Adjusted Ampacity,
Deration Factor and NEC
table reference.
Voltage Drop Keys

Percent Voltage Drop
— Toggles between
Actual Voltage Drop and
Percent Voltage Drop
with repeated presses.

Length — Enters or
calculates the Length
used for Voltage Drop.
(cont’d)
Pocket Reference Guide — 9
(cont’d)
  Wire Resistance
(Wire Res) — Displays
the Wire Resistance per
1,000 Feet.
Grounding Conductor Keys

Ground — Displays the
Copper and Aluminum
grounding electrode sizes
given an entered Wire
Size. Also shows Wire
Circular Mils and NEC
reference with additional
key presses.

Equipment Ground
(EqGrnd) — Provides
the Copper Equipment
Ground size given an
entered Wire Size.
Additional key presses
show Aluminum Ground
Size and the NEC
reference.
Fuse/Breaker Keys

Overload Protection
— Enters a percent
Overload Factor and
shows the Overload
required based on stored
Amps. The percent
multiplier is shown on the
second key press.
  Motor Type (M-Type)
— Displays the current
Motor Type for use with
Breaker/Fuse sizing.
Additional presses toggle
between Motor Types.

Dual Element Fuse
  Single Element Fuse
(SEFuse)

Inverse Time Breaker
  Instantaneous Trip
Circuit Breaker (InsTrip)
— Displays the minimum
Amp rating and percent
multipier.
Conduit Sizing Keys
,
,

Number of Wires —
Used to enter or calculate
the Number of Wires in
a raceway and calculate
Wire Area. Also shows
total Number of Wires
and the total area of all
wires entered.
(cont’d)
Pocket Reference Guide — 11
(cont’d)

Conduit Size — Enters
or calculates Conduit
Size. Additional presses
show the total number of
Wires, Percent Fill, Total
Wire Area and remaining
Wire Area when Conduit
Size is calculated.
  Conduit Type (Cond
Type) — Defines
Conduit Type by
entering the number
correlating to the Types
shown below. Repeated
presses of  
also toggles through the
Conduit Types.
1) EMT
7) LFMC
2) ENT
8) RMC
3) FMC
9) P-80
4) IMC
10) P-40
5) LFNB
11) P-A
6) LFNA
12) P-EB
PREFERENCE SETTINGS
Press , then  to access the
Preferences. Continue pressing 
to toggle through different settings.
Press  or  keys to toggle between
options. Press any other key to
exit Preferences.
KEYSTROKE
  (Prefs)
(NEC Code)





 (repeats options)
Second press of :
(Ambient
Temperature Units)

 (repeats options)
Third press of :
(Length Units)

 (repeats options)
DISPLAY
NEC
NEC
NEC
NEC
NEC
NEC
NEC
2011
1996
1999
2002
2005
2008
2011
AMBº 30. ºC
AMBº 86. ºC
AMBº 30. ºC
FEET 1.
MET 1.
FEET 1.
Pocket Reference Guide — 13
basic math operations
This calculator uses standard
chaining logic, calculating values in
order entered.
KEYSTROKE
DISPLAY
5.
1.
6.
1.5




percent calculations
The  key can be used for finding a
given percentage of a number or for
working add-on, discount or division
percentage calculations.
KEYSTROKE





DISPLAY
53.25
266.25
23.75
200.
MEMORY OPERATIONS
The Cumulative Memory is located
above . Single value storage
positions can also be found within
digits 1 through 9.
Using M+
KEYSTROKE
DISPLAY
1. Add to Memory:
     (M+)

   (M+)
M+ 355. &
M+ –255. &
2. Recall Total:
TTL 100. &



AVG 50. &
CNT 2. &
3. Display/Clear Memory:
100.

Using Memory Storage Keys (M1- M9)
KEYSTROKE



DISPLAY
M-1 175.
0.
M-1 175.
using the electricalc pro
KIRCHHOFF’S LAW
The ElectriCalc Pro can easily find
Volts, Amps, VA, Watts, HP (theoretical),
Efficiency and Power Factor.
Pocket Reference Guide — 15
Finding Voltage
Find the Voltage supply to a 1Ø load
drawing 14,605 VA and 115 Amps.
KEYSTROKE
DISPLAY
0.

1. Set to 1-Phase:
  (1Ø)
2. Enter VA:
1Ø

3. Enter Amps:

4. Solve for Volts:

1 PH
VA 14,605.
AMPS 115.
VOLT 127.
Finding Amps
What is the current for a load drawing
8,250 VA on a 240V, 3Ø circuit?
KEYSTROKE
DISPLAY
0.

1. Set to 3-Phase:
  (3Ø)
2. Enter VA:

3. Enter Volts:

4. Solve for Amps:

3Ø
3 PH
VA 8,250.
VOLT 240.
AMPS 19.846416
Finding Volt-Amps
What is the VA rating for a 120 Volt,
22 Amp, 1Ø circuit?
KEYSTROKE
DISPLAY
0.

1. Set to 1-Phase:
  (1Ø)
2. Enter Volts:

3. Enter Amps:

4. Solve for Volt-Amps:

1Ø
1 PH
VOLT 120.
AMPS 22.
VA 2,640.
Finding kW Rating
What’s the kW rating for a 90 Amp,
208V, 3Ø boiler with 100% Power
Factor?
KEYSTROKE
DISPLAY
0.

1. Set to 3-Phase:
  (3Ø)
3Ø
3 PH
2. Set Power Factor:
     (PF%) PF% 100.
3. Enter Amps:

AMPS 90.
(cont’d)
Pocket Reference Guide — 17
(cont’d)
KEYSTROKE
4. Enter Volts:

5. Solve for kW:

DISPLAY
VOLT 208.
KW 32.423991
OHM’S LAW
The ElectriCalc Pro uses Ohm’s Law
solve for DC Voltage, Current, or
Resistance.
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)
Idc 0.0125
A
2. Enter Resistance:

  (R)
3. Find Voltage:
  (Vdc)
OHMS 480.
Vdc 6.
V
Finding Amps
A 120k electrical resistor is plugged
into a 12 volt circuit. Find the Current.
KEYSTROKE
DISPLAY
0.

1. Enter Resistance:

  (R)
KOHM 120.
2. Enter Voltage:

  (Vdc)
Vdc 12.
V
3. Find Current:
  (Idc)
Idc 0.0001
A
Finding Resistance (Ohms)
An electrical circuit operating at 240
Volts has a Current of 14.6 Amperes.
Find the total Resistance.
KEYSTROKE
DISPLAY
0.

1. Enter Voltage:

  (Vdc)
Vdc 240.
V
Idc 14.6
A
2. Enter Current:

  (Idc)
3. Find Resistance:
  (R)
OHMS 16.438356
Pocket Reference Guide — 19
MOTOR functions
The ElectriCalc Pro can calculate
the Full-Load Current (Amps) of a
motor, based on Phase, Voltage and
Motor (Synchronous, Induction, or
DC) Horsepower using NEC Tables
430.247, 430.248 and 430.250.
Finding Full-Load Current
A 2 HP Induction motor operates on
230 Volt, Single-Phase power. What is
the Full-Load Current for this motor?
KEYSTROKE
DISPLAY
0.

1. Set to 1-Phase:
  (1Ø)
2. Enter Volts:

3. Enter HP:

1Ø
1 PH
VOLT 230.
IND* 2. HP
* Press   until IND is displayed in the
upper left area of the display.
4. Find Full-Load Current:

FLC 12.
A
Finding Motor Wire Size
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 3-Phase:
  (3Ø)
2. Set to 60º C:
  (60º)
3Ø
3 PH
3Ø 60
3 PH
3. Set to Copper (if necessary):
  (Cu/Al)
3Ø 60 Cu 3 PH
4. Enter Volts:
VOLT 230.

5. Enter HP:
10 
IND* 10. HP
* Press   until IND is displayed in the
upper left area of the display.
6. Find Full-Load Current:

FLC 28.
A
7. Find 125% Ampacity Wire Size:
AWG 8 CU
  (125%)
WIRE SIZE 125%
AMPACITY WIRE SIZING
Wire Sizing is based on Ampacity
requirements used in NEC Tables
310.15(B)(16) and 310.15(B)(17).
Wire Sizing
Wiring is being installed for a 240V,
1Ø system rated at 30 kVA. What is
the 60° C Copper Wire Size?
(cont’d)
Pocket Reference Guide — 21
(cont’d)
KEYSTROKE
DISPLAY
0.

1. Set to 1-Phase:
  (1Ø)
2. Set to 60º C:
  (60º)
1Ø
1 PH
1 Ø 60
1 PH
3. Set to Copper (if necessary):
  (Cu/Al)
1 Ø 60 Cu 1 PH
4. Enter kVA:
KVA 30.

5. Enter Volts:

6. Find Amps:

VOLT 240.
AMPS 125.
7. Find Wire Size:

AWG 0 CU
WIRE SIZE
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 3-Phase:
  (3Ø)
2. Set to 75º C:
  (75º)
3Ø
3 PH
3Ø 75
3 PH
3. Set to Copper (if necessary):
  (Cu/Al)
3Ø 75 Cu 3 PH
4. Enter Amps:

AMPS 265.
5. Find Wire Size:

AWG 300 CU
WIRE SIZE
6. Change to Aluminum:
  (Cu/Al) AWG 400 AL
WIRE SIZE
Sizing Parallel Conductors (Free Air)
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?
KEYSTROKE
DISPLAY
0.

1. Set to 60º C:
  (60º)
60
0.
2. Set to Copper (if necessary):
  (Cu/Al)
60 Cu 0.
3. Set to Free Air mode:
  (FrAir)
4. Enter Amps:

60 Cu FrAir
0.
AMPS 500.
5. Find Wire Size for one conductor:

AWG 500 CU WIRE SIZE
(cont’d)
Pocket Reference Guide — 23
(cont’d)
KEYSTROKE
DISPLAY
6. Find Wire Size for two conductors:

PAR 000 CU WIRE SIZE
7. Exit Free Air Mode and Clear:

60 Cu
0.
Finding Derated Wire Size
A circuit was built with 60°C Copper
wire connecting a 47,650 VA load
to a 240 Volt, 3Ø source. Ambient
Temperature is 50°C. What is the
Derated Wire Size required if eight
current-carrying THHN wires are
installed in the raceway?
KEYSTROKE
DISPLAY
0.

1. Set to 3-Phase:
  (3Ø)
2. Set to 60º C:
  (60º)
3Ø
3 PH
3Ø 60
3 PH
3. Set to Copper (if necessary):
  (Cu/Al)
3Ø 60 Cu 3 PH
4. Enter Volt-Amps:

5. Enter Volts:

6. Find Amps:
A
VA 47,650.
VOLT 240.
AMPS 114.62808.
7. Set to 50º C Ambient Temperature:

(Ambº)
Amb
AMB° 50. ºC
8. Find Derated Wire Size:

(D/R Size)
D/R 500 CU
WIRE SIZE
9. Reset Ambient Temperature
and Clear:

3Ø 60 Cu
0.
VOLTAGE DROP
The ElectriCalc Pro uses Resistance
values found in NEC Table 8 Chapter
9 to determine Voltage Drop, Wire
Lengths or Wire Sizes given a
maximum Voltage Drop percentage.
Finding 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?
KEYSTROKE
DISPLAY
0.

1. Set to 1-Phase:
  (1Ø)
2. Set to 75 º C:
  (75º)
1Ø
1 PH
1 Ø 75
1 PH
(cont’d)
Pocket Reference Guide — 25
(cont’d)
KEYSTROKE
DISPLAY
3. Set to Copper (if necessary):
  (Cu/Al)
1 Ø 75 Cu 1 PH
4. Enter Amps:

5. Enter Volts:

6. Enter Length:

AMPS 11.
VOLT 208.
FEET 175.
7. Enter Wire Size:

AWG 8 CU
8. Solve Voltage Drop:
WIRE SIZE
DROP 3.0
V
9. Solve percent Voltage Drop:

DROP 1.4 %
V

Finding Voltage Drop Wire Size
A 20 Amp, 3Ø 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?
KEYSTROKE
DISPLAY
0.

1. Set to 3-Phase:
  (3Ø)
2. Set to 75º C:
  (75º C)
3Ø PH
3Ø 75
3 PH
3. Set to Copper (if necessary):
  (Cu/Al)
3Ø 75 Cu 3 PH
4. Enter Amps:

5. Enter Volts:

6. Enter Length:

AMPS 20.
VOLT 208.
FEET 175.
7. Enter allowable VD%:

DROP 3.0 %
8. Find Wire Size:

AWG 8 CU
V
VD WIRE SIZE
Finding Voltage Drop Distance
How far from a Three-Phase 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
DISPLAY
0.

1. Set to 3-Phase:
  (3Ø)
2 Set to 60º C:
  (60º)
3Ø
3 PH
3Ø 60
3 PH
3. Set to Copper (if necessary):
  (Cu/Al)
3Ø 60 Cu 3 PH
(cont’d)
Pocket Reference Guide — 27
(cont’d)
KEYSTROKE
DISPLAY
4. Enter Amps:

5. Enter Volts:

AMPS 15.
VOLT 240.
6. Enter Wire Size:
   * AWG 10 CU
WIRE SIZE
7. Enter 3% allowable Voltage Drop:

DROP 3.0 % V
8. Find distance:

FEET 234.86987
Finding Voltage Drop Resistance
What is the Resistance per 1,000 Ft.
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)
90 Cu 0.
3. Enter Wire Size:
*
AWG 2 CU
WIRE SIZE
4. Find Resistance:

(Wire Res)
OHMS 0.2033993
WIRE
GROUND CONDUCTOR
WIRE SIZE
The ElectriCalc Pro uses NEC Table
250.66 to find the Grounding Electric
Conductor Size for an entered Feeder
Size.
Find the Grounding electrode
conductor Wire Size required when
a 2/0 Copper service-entrance
conductor is being used.
KEYSTROKE
DISPLAY
0.

1. Enter Wire Size and find Ground
Wire Size:
00  GRND 4 CU WIRE SIZE
2. Find Aluminum size:

GRND 2 AL
WIRE SIZE
EQUIPMENT GROUNDING
COUNDUCTOR WIRE SIZE
The ElectriCalc Pro uses an external
amperage to find 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.
(cont’d)
Pocket Reference Guide — 29
(cont’d)
KEYSTROKE
DISPLAY
0.

1. Find Equipment Ground Wire Size:
45 
 (EqGrnd) EQPG 10 CU
WIRE SIZE
2. Find Aluminum size:

EQPG 8 AL
WIRE SIZE
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 Full-Load Current
amperage value can be used to find
the Fuse Breaker Sizes.
What is the Dual Element Fuse
size for a 230 Volt, 3-Phase, 50 HP
Induction motor?
KEYSTROKE
DISPLAY
0.

1. Set to 3-Phase:
  (3Ø)
2. Enter Volts:

3. Enter HP:

3Ø
3 PH
VOLT 230.
IND* 50. HP
* Press   until IND is displayed in the
upper left area of the display.
4. Find Full-Load Current:

FLC 130.
A
5. Find Dual Element Fuse size:

AMPS 227.5 dE
STARTER SIZE
What size NEMA Starter is
required for a 575 Volt, 3Ø, 20 HP
Induction motor?
KEYSTROKE
DISPLAY
0.

1. Set to 3-phase:
  (3Ø)
2. Enter Volts:

3. Enter HP:

3Ø
3 PH
VOLT 575.
IND* 20. HP
* Press   until IND is displayed in the
upper left area of the display.
4. Solve for Starter Size:
  (Starter)
STAR
SIZE
2
OVERLOAD PROTECTION SIZE
What Overload Protection device size
is required for an Induction motor
with a nameplate rating of 19.2 Amps
and a 1.0 service factor? What is the
required Overload at 125% (for a 1.15
service factor)?
(cont’d)
Pocket Reference Guide — 31
(cont’d)
KEYSTROKE
DISPLAY
0.

1. Enter nameplate Current:

AMPS
19.2
2. Find Overload size:

AMPS 22.08 o l
3. Display percent used:

%FLC 115. %
4. Find 125% Load:

AMPS 24. o l
5. Display percent used:

%FLC 125. %
6. Reset Overload rating and Clear:

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. To select a specific Conduit
Type, enter the corresponding number
of the Conduit as shown below and
then press  .
1) EMT
4) IMC
2) ENT
5) LFNB 8) RMC
7) LFMC 10) P-40
11) P-A
3) FMC
6) LFNA 9) P-80
12) P-EB
Finding Motor Branch-Circuit 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 1-Phase:
  (1Ø)
2. Set to 60º C:
  (60º)
1Ø
1 PH
1 Ø 60
1 PH
3. Set to Copper (if necessary):
  (Cu/Al)
1 Ø 60 Cu 1 PH
4. Enter Volts:
VOLT 115.

5. Enter Horsepower:

IND 10. HP
* Press   until IND is displayed in the
upper left area of the display.
6. Display Full-Load Amps:

FLC 100.
A
7. Find Wire Size at 125% Ampacity:
AWG 0 CU
  (125%)
WIRE SIZE 125%
8. Find Wire Ampacity:

Ø 125.0
WIRE A125%
(cont’d)
Pocket Reference Guide — 33
(cont’d)
KEYSTROKE
DISPLAY
9. Enter Conduit Type and find
Conduit Size:
8S 
(Cond Type)
RMC 1.25 in
COND SIZE
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
Finding Conduit Size —
Multiple Conductors, Different Wire
Sizes and Types
Three 1/0 THWN conductors and one
#2 XHHW conductor are to connect to
a panel board using a single Conduit.
What is Conduit Size needed and
actual Fill Area?
KEYSTROKE
DISPLAY
0.

1. Enter Conduit Type:

(Cond Type)
FMC nonE
2. Enter first Wire Size:
 *
AWG 0 CU
COND
WIRE SIZE
3. Enter number of THWN Wires:

THHN 3. WIRES
4. Enter second Wire Size:
 *
AWG 2 CU
WIRE SIZE
5. Enter number of XHHW Wires:

XHHW 1. WIRE
6. Find Conduit Size:

FMC 1.50 in
COND SIZE
7. Find total number of Wires:

4. TTL
WIRES
8. Find Conduit Fill Percent:

FILL 36.1 %
COND
9. Find actual Fill Area:

FILL 0.6711 TTL
WIRE AREA
10. Find Remaining Area:

REM 0.0717
WIRE AREA
CONVERTING KILOWATT-HOUR
AND BTU
Find the equivalent BTU rating of a
3.5 kilowatt-hour rated furnace.
KEYSTROKE
DISPLAY

1. Enter kilowatt hours:

0.
3.5
2. Find equivalent BTU:
  (Kw-hr►Btu) BTU 11,953.552
(cont’d)
Pocket Reference Guide — 35
(cont’d)
What is the kilowatt-hour rating for a
4,500 BTU heater?
KEYSTROKE
DISPLAY
0.

1. Enter BTU rating:
4,500.

2. Find equivalent kilowatt hours:
  (Btu►Kw-hr) KW-H 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:

P-RS 10.
(Par Res)
2. Enter second Resistor:

(Par Res)
P-RS 6.6666667
3. Enter third Resistor:

(Par Res)
P-RS 5.8823529
Note: The total is recalculated with each
additional Resistor value entered.
APPENDIX A —
DEFAULT SETTINGS
After a Clear All ( ), your
calculator will return to the following
settings:
STORED VALUES
Insulation Rating
Wire Material
Phase
Ambient
Temperature
Volts
Voltage Drop %
Power Factor %
Efficiency %
Motor Type
Conduit Type
Fuse/Breaker
Motor Type
Overload FLC%
Free Air Mode*
DEFAULT VALUE
60º C
Copper
3Ø
30º C (86º F)
240V
3%
100%
100%
Induction
EMT
Squirrel Cage
non Design E
115%
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 O,
hold down x and press o) your
calculator will return to the following
settings (in addition to those listed
above):
(cont’d)
Pocket Reference Guide — 37
(cont’d)
Preference
Settings
DEFAULT
VALUE
NEC Code
2011
Temperature Units
°C
Length Units
FEET
* Depressing the Reset button located
above the C key will also perform a
Full Reset.
APPENDIX B —
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 of the
User's Guide 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.
APPENDIX C —
ACCURACY/ERRORS, AUTO
SHUT-OFF, BATTERIES, RESET
Accuracy/Errors
Accuracy/Display Capacity — Your
calculator has an eight-digit 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 re-key
the problem.
Error Codes
DISPLAY
ERROR TYPE
OFLO
Overflow; answer too large
to display
ENT Error
Invalid entry
POWR Error
Power Factor
(PF) or Efficiency (EFF)
calculated
above 100%
(cont’d)
Pocket Reference Guide — 39
(cont’d)
nonE
Unable to
calculate or not
available
HP Error
Invalid Horsepower entry per
NEC table
FULL Error
Entered or
calculated more
than 15 different
Wires Sizes
EROM Error
Bad EPROM
MATH Error
Math error (i.e.,
divide by zero)
Auto Shut-Off
Your calculator is designed to shut
itself off after about 8-12
minutes of non-use.
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 1-775-885-4900 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.
Pocket Reference Guide — 41
Repair and Return
Return Guidelines
1.
Please read the Warranty in the
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 7:00am to 4:30pm
Pacific Time for additional
information and a Return
Merchandise Authorization
(RMA).
Call Toll Free: 1-800-854-8075
Outside USA: 775-885-4900
www.calculated.com/warranty
4840 Hytech Drive
Carson City, NV 89706 U.S.A.
1-800-854-8075
Fax: 1-775-885-4949
E-mail: info@calculated.com
www.calculated.com
Pocket Reference Guide — 43