Calculated Industries ElectriCalc Pro User manual

User'sGUide — 1
TABLE OF CONTENTS
ELECTRICALC®PRO..........................................................................3
GETTING STARTED............................................................................4
KEY DEFINITIONS.................................................................................4
Basic Function Keys ..........................................................................4
Mode Set-up 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 Volt-Amps.............................................................................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 Single-Phase Full-Load Current...........................................28
Finding Motor Wire Size and Ampacity.............................................28
Finding Synchronous Motor Horsepower..........................................29
Finding Direct Current Motor Horsepower ........................................30
(cont’d)

2 — electricalc®Pro
AMPACITY WIRE SIZING ....................................................................30
Wire Sizing Based on Insulation Rating............................................31
Re-Sizing 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 Temperature-Adjusted Derated Wires....................................36
VOLTAGE DROP..................................................................................38
Finding Single-Phase Voltage Drop..................................................38
Finding Three-Phase 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 Branch-Circuit 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 KILOWATT-HOUR AND BTU.......................................53
PARALLEL RESISTANCE ....................................................................54
APPENDIX A — DEFAULT SETTINGS.............................................55
APPENDIX B — PREFERENCE SETTINGS ....................................56
APPENDIX C — 2011 NEC REFERENCES ......................................57
APPENDIX D — CARE INSTRUCTIONS..........................................57
APPENDIX E — ACCURACY/ERRORS,
AUTO SHUT-OFF, BATTERIES, RESET...........................................58
REPAIR AND RETURN......................................................................60
WARRANTY.......................................................................................61
(cont’d)

User'sGUide — 3
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 2011 (and 2008, 2005,
2002, 1999, 1996) and future National Electrical Codes, allowing you
to solve Code-related problems quickly and accurately. The most
common NEC tables are now at your ngertips!
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, Volt-Amps, 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 Full-Load Amps
• Overload Protection Sizes
• NEMA Starter Sizes
• Conduit Sizes
• And much more!

4 — electricalc®Pro
GETTING STARTED
You may want to practice getting a feel for your calculator keys by
reading through the key denitions 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 non-
permanent values.


Arithmetic operation keys.
-
and 
Keys used for entering numbers.

Second Function — 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 — Adds displayed value
to Accumulative Memory.

Memory Recall — Displays the value saved in
the Accumulative Memory register.

User'sGUide — 5
(cont’d)

Memory Clear (M-R/C) — Clears Accumulative
Memory without changing current display.

Percentage — Used to nd a given percent
of a number.

x2— 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 Set-up Keys

Preference Settings (Prefs) — Use to
dene calculator modes (see Preference
Settings section).

Single-Phase (1Ø) — Sets calculator to Single-
Phase mode.

Three-Phase (3Ø) — Sets calculator to
Three-Phase mode. This is the default setting.

6 — electricalc®Pro
(cont’d)

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).
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 re-calculated
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
Volt-Amps keys to identify “kilo-” values.

User'sGUide — 7
(cont’d)

milli- — Used with Watts, Amps, Volts, and
Volt-Amps 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.

Volt-Amps — Enters or calculates Volt-Amps
(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, Efciency%, PF%, and/or Volts). 1.0 HPth
correlates to 746 Watts at 100% Efciency.

8 — electricalc®Pro
(cont’d)

Efficiency (Eff %) — Enters or calculates the
percent ratio between real power (Watts) and
Theoretical Horsepower. Default value is 100%.
Entered or calculated Efciencies greater than
100% will result in an error.

Kilowatt–Hours to BTU (Kw-hr ►Btu) —
Calculates BTU (British Thermal Unit) based on
an entered Kilowatt-Hour value.

BTU to Kilowatt–Hours (Btu ►Kw-hr) —
Calculates Kilowatt-Hours 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 Full-Load Current
(Amps) based on entries for Motor Horsepower (HPmotor), Phase
and Voltage. You can also nd an equivalent Motor Horsepower if you
have entered Voltage and Full-Load Current values. Only HP Motor
and Voltage entries as dened 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) — Toggles between 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 2-1988 Tables
2-327-1 and 2-327-2) based on the Phase,
Voltage, and Motor Horsepower settings.
Note: Horsepower values not identied in NEMA
tables will cause the calculator to round up to the
next larger Starter Size in the table.

User'sGUide — 9
Wire Sizing Keys
The ElectriCalc Pro uses NEC Table 310.15(B)(16) (310.15(B)(17)
for Free Air) to nd 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 rst
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.
♦ 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.
(cont’d)