Calculated Industries 5065 User Manual

E

LECTRICALC

®

P

RO

NEC®COMPLIANT

UPDATEABLE ELECTRICAL CODE CALCULATOR

Model 5065

User’s Guide

The

ElectriCalc®Pro

is an invaluable
calculator for today’s busy electrical
professional. Unlike a regular calculator, it
has intuitively labeled “electrical keys” and
conforms to the 2005 (and 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 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.

Introducing the

ElectriCalc®Pro

Now NEC®-Updateable!

The

ElectriCalc Pro

instantly solves for

the following:

• Kirchhoff’s Law

• Ohm’s Law

• Volts, Amps, Volt-Amps, Watts, kVA,

kW, PF%, EFF%, and Resistance

• Copper or Aluminum Wire Sizes

• Parallel and Derated Wire Sizes

• Voltage Drop Wire Sizes, % and

Actual Voltage Drops, Voltage
Drop Distances and Wire 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!

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 KW-HR 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
1-800-854-8075). This Update is in the
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 bat-

tery (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.

User’s Guide — 1

Standard Calculator Functions

o —

On/Clear

Turns on power. Pressing once clears
the last entry and the display. Pressing
twice clears all non-permanent 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

Key Definitions

2 — ElectriCalc Pro

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 (M-R/C)

Displays and clears the value saved in
(

M+

).

S r —

Clear Memory

Clears the value saved in (M+) without
changing displayed value.

User’s Guide — 3

s 1 - 9 —

Memory Storage

When pressed after the s key, the 1
through 9 keys will store the displayed
values into non-cumulative Memory.

r 1 - 9

Recall M1 – M9.

Mode Set-up 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 —

Single-Phase (1Ø)

Sets calculator to single-phase mode.

Displays: 1Ø
S 3 —

Three-Phase (3Ø)

Sets calculator to three-phase mode.
This is the default setting. Displays: 3Ø

S 2 —

Ambient Temperature (AMB°)

Permanently enters ambient 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)

4 — ElectriCalc Pro

(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 re-calculated 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 310-17 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

User’s Guide — 5

Electrical Functions

K —

kilo-

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

S K —

milli-

This key sequence is used with Watts,
Amps, Volts, and Volt-amps keys 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 —

Volt-Amps

Enters or calculates Volt-amps (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

6 — ElectriCalc Pro

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 V olts 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

(Kw-hr

©

Btu)

Calculate BTU (British
Thermal Unit) based on an entered
Kilowatt-Hour value. Displays: KW-H

User’s Guide — 7

S = —

BTU to Kilowatt–Hours

(Btu

©

Kw-hr)

Calculate Kilowatt-Hours
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: P-RS

Motor Horsepower Functions

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 find an equivalent motor
Horsepower if you have entered V oltage
and full load current values. Only HP
motor and Voltage entries as defined by
NEC Tables 430-247, 430-248 and 430­250 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(synchro-
nous) or DC (direct current).

h —

Motor Horsepower

Enters or calculates motor Horsepower.

Displays: IND HP (induction – default),
SYNC HP (synchronous) or DC HP

(direct current).

8 — ElectriCalc Pro

Ampacity Tables

The

ElectriCalc Pro

uses NEC Table
310-16 (310-17 for Free Air) to find wire
sizes and ampacity ratings of wires.
The calculator uses the following data
to calculate wire size: 1) insulation
temperature rating (60°C, 75°C and
90°C); 2) wire material (copper or
aluminum); 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.

User’s Guide — 9

♦

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)

10 — ElectriCalc Pro

(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
310-16 and NEC Table 310-15(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 310-15(b)(2)(a).

Displays: ADJ %

♦

Fourth Press

Displays the NEC table referenced for
the calculation. Displays: NEC 310.15

User’s Guide — 11

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

.

12 — ElectriCalc Pro

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 output-only key used to find the
grounding electrode conductor size for
AC systems based on NEC Table
250-66 and an entered or calculated
service-entrance 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

User’s Guide — 13

♦

Fourth Press

Displays the NEC table referenced for
the calculation. Displays: NEC 250.66

S G —

Equipment Ground (EqGrnd)

This function uses NEC Table 250-122
to calculate the minimum equipment
grounding conductor size, given an
entered amperage rating or setting for a
over-current device up line (e.g., 300
S G).

NOTE: This function deviates from the
NEC Table 250-122 in that 1250 MCM
AL is used instead of 1200 as specified
in NEC Table 250-122.

♦

First Press

Displays the copper grounding conduc­tor size for the entered Amp rating.

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

14 — ElectriCalc Pro

Fuse/Breaker Keys

The

ElectriCalc Pro

has special keys
that automatically calculate the Amp
ratings of the following over-current
protection devices: Dual Element Fuses
(Time Delay), Single Element Fuses
(Non-Time Delay), Instantaneous Trip
Breakers (Type 1), Inverse Time
Breakers (Type 2), and Overload
Protection Devices.

These fuse and circuit breaker sizes
are derived using the “Percent of Full­Load Current” multipliers listed in NEC
Table 430-52.

You can also calculate the full Voltage
starter size for non-plugging 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 (M-Type)

Based on NEC Table 430-52, 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 single-phase
mode.

User’s Guide — 15

♦

Second Press

In three-phase mode only, subsequent
presses of L will select and
display the next motor type from this
list: SQ-C non-B (Squirrel Cage, non-
Design B), SQ-C B (Squirrel Cage,
Design B), SYNC no codE (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 full-load 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 full-load current percent
multiplier value used to determine fuse
size. Subsequent presses repeat this
cycle. Displays: %FLC

16 — ElectriCalc Pro

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 full-load 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 full-load current percent
multiplier value used to determine
breaker size. Displays: %FLC

L —

Overload Protection

♦

First Press

Displays the overload amperage require­ment based on the full-load current shown
on the motor nameplate. Multiplies the
entered motor nameplate full-load current
(stored in the A registers) by 115% or
the value you enter.

User’s Guide — 17

Conforms to NEC Section 430-32 (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 full-load 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 2-1988 Tables 2-327-1
and 2-327-2) based on the phase, Volt­age, and motor Horsepower settings.

Displays: STAR SIZE

NOTE: Horsepower values not identi-

fied in NEMA tables will cause the cal­culator to round up to the next larger
starter size in the table.

18 — ElectriCalc Pro

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”, 1-1/4”, 1-1/2”, 2”,
2-1/2”, 3”, 3-1/2”, 4”, 5”, and 6”. Conduit
sizes are entered using decimal equiva­lents (e.g., 1-1/2” 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
cross-sectional 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 cross-sectional area for all
entered wires. Displays: WIRE AREA
(entered) or TTL WIRE AREA (calculated).

♦

Third Press

Shows total cross-sectional area of all
entered wires of the selected wire insu­lation. Displays: TTL WIRE AREA

User’s Guide — 19

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 single-phase or 3 THHN
wires for three-phase calculations.

♦

First Press

Enters or calculates conduit size.

Displays: COND SIZE

NOTE: If a wire size has not been en-

tered 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)

20 — ElectriCalc Pro

(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 T ype)

♦

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) P-80

10) P-40

11) P-A

12) P-EB
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.

User’s Guide — 21

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

back-up).
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

Preference Settings

22 — ElectriCalc Pro

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.

When you first receive your calculator,
it is pre-set 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 Copper (Cu)
Phase 3Ø
Volts 240 V
Efficiency 100%
Power Factor 100%
Voltage Drop Percent 3%
Wire Environment Raceway

(vs Free Air)

Default Settings

User’s Guide — 23

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

The Percent key % can be used for find­ing a given percentage of a number or
for working add-on, discount or division
percentage calculations.

355 x 15% 53.25
250 + 6¥5% 266.25
25 - 5% 23.75
100 Ö 50% 200.

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

Percent Calculations

Basic Math Operations

24 — ElectriCalc Pro

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 semi-permanent, 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 M+ 355.
2 5 5 s 0 M+ 255.
7 4 5 S - s 0 M+ – 745.
r 0 TTL – 135.
r 0 AVG – 45.
r 0 CNT 3.
r r – 135.

M

M

M

M

M

M

Memory Operations

User’s Guide — 25

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 9).

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

FUNCTION KEYSTROKES

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

Examples:
Store 175 into M1, recall the value, and

then clear the value.

KEYSTROKES DISPLAY

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

r 1 M-1 175.
0 s 1 M-1 0.

26 — ElectriCalc Pro

The

ElectriCalc Pro

utilizes Kirchhoff’s
Law in finding Volts, Amps, Volt-amps,
Watts, Horsepower (theoretical), efficien­cy and power factor.

Finding Voltage

Find the Voltage supply to a single­phase load drawing 14,605 Volt-amps
and 115 Amps.

Steps Keystrokes Display

Clear calculator

o o

0.

Set to 1-phase

S 1

1 PH

Enter VA

1 4 6 0 5 V

VA 14,605.

Enter Amps

1 1 5 A

AMPS 115.

Solve for Volts

U

VOLT 127.

Finding Amps

What is the current (Amps) for a load
drawing 8,250 Volt-Amps on a 240 Volt,
three-phase circuit?

Steps Keystrokes Display

Clear calculator

o o

0.

Set to 3-phase

S 3

3 PH

Enter VA

8 2 5 0 V

VA 8,250.

Enter Volts

2 4 0 U

VOLT 240.

Solve for Amps

A

AMPS 19.846416

Kirchhoff’s Law

User’s Guide — 27

Finding Current Load

A building with 120/240 Volt 1Ø service
has the following loads:

Range = 7,800 VA Heating = 15,100 VA
Dryer = 5,100 VA Appliances = 8,900 VA
Lighting = 6,470 VA

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

Steps Keystrokes Display

Clear calculator

o o

0.

Set to 1-phase

S 1

1 PH

Add VA loads:

7 8 0 0 +

1 5 1 0 0 +

5 1 0 0 +
8 9 0 0 +
6 4 7 0 =

43,370.

Enter as VA

V

VA 43,370.

Enter Volts

2 4 0 U

VOLT 240.

Solve for Amps

A

AMPS 180.70833

Finding Amps from 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

0.

Set to 3-phase

S 3

3 PH

Enter kilowatts

7 5 K W

KW 75.

Enter Volts

2 0 8 U

VOLT 208.

Solve for Amps

A

AMPS 208.17918

28 — ElectriCalc Pro

Finding Volt-Amps

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

0.

Set to 1-phase

S 1

1 PH

Enter Volts

1 2 0 U

VOLT 120.

Enter Amps

2 2 A

AMPS 22.

Solve Volt-amps

V

VA 2,640.

Solve for kVA

K V

KVA 2.64

Finding kVA Rating

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

Steps Keystrokes Display

Clear calculator

o o

0.

Set to 3-phase

S 3

3 PH

Enter Volts

2 0 8 U

VOLT 208.

Enter Amps

6 5 A

AMPS 65.

Solve for kVA

K V

KVA 23.417327

Finding Wattage

A120 Volt, single-phase, 45 Amp electri­cal motor has an 87% power factor.
What is its wattage?

Steps Keystrokes Display

Clear calculator

o o

0.

Set to 1-phase

S 1

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.

User’s Guide — 29

Finding kW Rating

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

Steps Keystrokes Display

Clear calculator

o o

0.

Set to 3-phase

S 3

3 PH

Set power factor

1 0 0 S W

PF%100.

Enter Amps

9 0 A

AMPS 90.

Enter Volts

2 0 8 U

VOLT 208.

Solve for kW

K W

KW 32.423991

The

ElectriCalc Pro’s

built-in Ohm’s 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

Ohm’s Law

30 — ElectriCalc Pro

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

0.

Enter current ¥ 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

0.

Enter resistance

1 2 0 K S V

KOHM 120.

Enter Voltage

1 2 S U

Vdc 12.

Find current

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

0.

Enter Voltage

2 4 0 S U

Vdc 240.

Enter current

1 4 ¥ 6 S A

Idc 14.6

Find resistance

S V

OHMS 16.438356

User’s Guide — 31

The

ElectriCalc Pro

can calculate the
full load current (Amps) of a motor,
based on phase, Voltage and motor
(synchronous, induction, or DC). It uses
NEC Tables 430-247, 430-248 and
430-250 to determine the motor full 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
430-247, 430-248 or 430-250 will cause
the calculator to choose the next higher
table value for motor Horsepower.

Finding Single-Phase Full Load
Current

A 2 HP induction motor operates on 230
Volt, single-phase power. What is the full
load current for this motor?

Steps Keystrokes Display

Clear calculator

o o

0.

Set to 1-phase

S 1

1 PH

Enter Volts

2 3 0 U

VOLT 230.

Enter HP

2 h

IND 2. HP

Find full load Amps

A

FLC 12. A

Motor Horsepower

32 — ElectriCalc Pro

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

0.

Set to 3-phase

S 3

3 PH

Enter Volts

2 3 0 U

VOLT 230.

Enter HP

3 h

IND 3. HP

Find load current

A

FLC 9.6 A

Find 125% A size

S w

AWG 14 CU

WIRE SIZE 125%

Find max ampacity

w

14* 20.0

WIRE A125%

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

Finding Synchronous Motor
Horsepower

Asynchronous 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

0.

Set to 3-phase

S 3

3 PH

Set to synch.

S 8

SYNC 0.

Enter Volts

2 4 0 U

VOLT 240.

Enter Amps

2 7 A

AMPS 27.

Solve for HP

h

SYNC 25. HP

Set to ind. motor

S 8 S 8

IND 0.

User’s Guide — 33

Finding Direct Current Motor
Horsepower

Adirect 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

1 8 0 U

VOLT 180.

Enter Amps

1 0 A

AMPS 10.

Solve for HP

h

DC 2. HP

Set to ind. motor

S 8

IND 0.

34 — ElectriCalc Pro

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 310-16 and 310-17.

Wire Sizing Based on
Insulation Rating

Wiring is being installed in a 240 Volt,
single-phase 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

0.

Set to 1-phase

S 1

1 PH

Enter kVA

3 0 K V

KVA 30.

Enter Volts

2 4 0 U

VOLT 240.

Find Amps

A

AMPS 125.

Find wire size

w

AWG 0 CU

WIRE SIZE

Display Wire
Ampacity

w

0 125.0 Cu WIRE A

Display CMIL

w

CMIL 105,600 WIRE

Display NEC Table

w

NEC 310.16

Ampacity Wire Sizing

User’s Guide — 35

Re-sizing 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

0.

Set to 3-phase

S 3

3 PH

Set to 75°C

S 7

3Ø 75 Cu 3 PH

Enter Amps

260 A

AMPS 260.

Find wire size

w

AWG 300 CU

WIRE SIZE

Change to 90˚

S 9

AWG 0000 CU

WIRE SIZE

Reset to 60˚

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 Volt-amp load to a
240 Volt, single-phase 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

0.

Set to 1-phase

S 1

1 PH

Set to 90°C

S 9

1Ø 90 Cu 1 PH

Enter VA

4 7 7 0 0 V

VA 47,700.

(Cont’d)

36 — ElectriCalc Pro

(Cont’d)

Steps Keystrokes Display

Enter Volts

2 4 0 U

VOLT 240.

Find Amps

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.

User’s Guide — 37

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

0.

Set to 3-phase

S 3

3 PH

Set to 75°C

S 7

3Ø 75 Cu 3 PH

Enter Amps

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.

38 — ElectriCalc Pro

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

0.

Set to 60°C

S 6

3Ø 60 Cu 0

Set free air mode

S 5

3Ø 60 FrAir Cu 0.

Enter Amps

5 0 0 A

AMPS 500.

Find 1 wire size

w

AWG 500 CU

FrAir WIRE 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.

User’s Guide — 39

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

0.

Set to 75°C

S 7

3Ø 75 Cu 0.

Enter Amps

6 5 A

AMPS 65.

Find normal

wire size

w

AWG 6 CU

WIRE SIZE

Find derated

wire size

9 S P

D/R 3 CU

WIRE SIZE

Display Wire

P

D/R 45.5

Ampacity WIRE A

Display Adjustment

P

ADJ 70. %

Factor

Display NEC Table

P

NEC 310.15

NOTE: See “Settings” for a list of
Permanent Values/settings. Changing
these settings may affect your calculations.

40 — ElectriCalc Pro

Sizing Temperature-Adjusted
Derated Wires

A circuit was built with 60°C copper wire
connecting a 47,650 Volt-amp load to a
240 Volt, three-phase source. Ambient
temperature is 50°C. What is the derated
wire size required if eight current-carrying
THHN wires were installed in the race­way?

Steps Keystrokes Display

Clear calculator

o o

0.

Set to 60°C

S 6

3Ø 60 Cu 0.

Enter Volt-amps

4 7 6 5 0 V

VA 47,650.

Enter Volts

2 4 0 U

VOLT 240.

Set to 50°C amb

5 0 S 2

AMB° 50. °C

Find adj. wire size

w

AWG 250 CU

Amb WIRE SIZE

Find derated

8 S P

D/R 500 CU

wire size Amb WIRE SIZE

Display Wire

P

D/R 46.5

Ampacity Amb WIRE A

Display Adjust.

P

ADJ 41. %

Factor Amb

Display NEC Table

P

NEC 310.15

Set to 30°C 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.

User’s Guide — 41

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.

Voltage Drop

42 — ElectriCalc Pro

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 one-way

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 Single-Phase 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

0.

Set to 1-phase

S 1

1 PH

Set to 75°C

S 7

1Ø 75 Cu 1 PH

Enter Amps

1 1 A

AMPS 11.

Enter Volts

2 0 8 U

VOLT 208.

Enter Length

1 7 5 l

FEET 175.

Enter wire size*

8 w

AWG 8 CU

WIRE SIZE

Solve volt. drop

v

DROP 3.0 V

Solve % v.drop

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).

User’s Guide — 43

N

OTE: See “Settings” for a list of

Permanent Values/settings. Changing
these settings may affect your calcula

tions.

Finding Three-Phase
Voltage Drop

A 20 Amp, three-phase 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

0.

Set to 75°C

S 7

3Ø 75 Cu 0.

Set to 3-phase

S 3

3Ø 75 Cu 3 PH

Enter Amps

2 0 A

AMPS 20.

Enter Volts

2 3 0 U

VOLT 230.

Enter Length(feet)

1 5 0 l

FEET 150.

Find VD wire size

w

AWG 10 CU

VD WIRE SIZE

Solve volt. drop

v

DROP 6.4 V

Solve % v.drop

v

DROP 2.8 V %

NOTE: See “Settings” for a list of
Permanent Values/settings. Changing
these settings may affect your calculations.

44 — ElectriCalc Pro

Finding Voltage Drop Wire Size

A 20 Amp, three-phase 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?

Steps Keystrokes Display

Clear calculator

o o

0.

Set to 75°C

S 7

3Ø 75 Cu 0.

Enter Amps

2 0 A

AMPS 20.

Enter Volts

2 0 8 U

VOLT 208.

Enter distance

1 7 5 l

FEET 175.

Enter allow. VD%

3 v

DROP 3.0 V %

Find wire size

w

AWG 8 CU

VD WIRE SIZE

Find actual

Voltage drop

v

DROP 4.7 V

Find % v.drop

v

DROP 2.3 V %

NOTE: See “Settings” for a list of
Permanent Values/settings. Changing
these settings may affect your calculations.

User’s Guide — 45

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.

Steps Keystrokes Display

Clear calculator

o o

0.

Set to 60°C

S 6

3Ø 60 Cu 0.

Enter Amps

1 5 A

AMPS 15.

Enter Volts

2 4 0 U

VOLT 240.

Enter wire size*

1 0 w

AWG 10 Cu

WIRE SIZE

Enter 3% VD

3 v

DROP 3.0 V %

Find distance

l

FEET 234.86987

Find actual

Voltage drop

v

DROP 7.2 V

Find % v.drop

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.

46 — ElectriCalc Pro

Finding Voltage Drop Resistance

What is the resistance of 85 Feet of #2
90°C copper conductor?

Steps Keystrokes Display

Clear calculator

o o

0.

Set to 90°C

S 9

3Ø 90 Cu 0.

Enter wire size*

2 w

AWG 2 CU

WIRE SIZE

Find resistance

S l

OHMS 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

0.

Enter Voltage

1 2 S U

Vdc 12.

Enter Amps

5 S A

Idc 5.

Find resistance

S V

OHMS 2.4

User’s Guide — 47

You can use single or multiple service
entrance conductor(s) to find the
grounding electrode conductor for AC
systems. When using multiple conduc­tors, the

ElectriCalc Pro

uses the
equivalent Circular Mils to find the
grounding electrode conductor (based
on NEC Table 250-66).

Find the grounding electrode conductor
wire size required when 2/0 is the larg­est 3-phase 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

0.

Set to 3-phase

S 3

3 PH

Set to 75º C

S 7

3Ø 75 Cu 3 PH

Enter wire size*

0 0 w

AWG 00 CU

WIRE SIZE

Find ground wire

G

GRND 4 CU

size WIRE SIZE

Find aluminum size

G

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).

Ground Conductor Wire Size

48 — ElectriCalc Pro

The S G keystroke can be used
to find the grounding conductor size for
raceways and “over-current devices in
circuit ahead” equipment. The calcula­tor uses the displayed amperage value
to solve for the equipment grounding
conductor based on NEC Table
250-122.

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

0.

Set to 90º C

S 9

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

Equipment Grounding
Conductor Wire Size

User’s Guide — 49

What is the calculated dual element and
single element fuse size for a 230 Volt,
3-phase, 50 HP induction motor? What
are the Instantaneous Trip and Inverse
Time Circuit Breaker requirements?

Steps Keystrokes Display

Clear calculator

o o

0.

Set to 3-phase

S 3

3 PH

Enter Volts

2 3 0 U

VOLT 230.

Enter HP

5 0 h

IND 50. HP

Find full current

A

FLC 130. A

Find DE fuse size

D

AMPS 227.5 dE

Display % used

D

%FLC 175.

Find SE fuse size

S D

AMPS 390. SE

Display % used

D

%FLC 300.

Find inv. time brkr

I

AMPS 325. b2

Display % used

I

%FLC 250.

Find ins. trip

breaker size

S I

AMPS 1,040. b1

Display % used

I

%FLC 800.

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

Steps Keystrokes Display

Clear calculator

o o

0.

Set to 3-phase

S 3

3 PH

Enter Volts

5 7 5 U

VOLT 575.

Enter HP

2 0 h

IND 20. HP

Solve for

starter size

S h

STAR 2 SIZE

Starter Size

Fuse and Circuit Breaker Size

50 — ElectriCalc Pro

What overload protection device size is
required for a 460 Volt, 3-phase, 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

0.

Set to 3-phase

S 3

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

AMPS 22.08 ol

Display % used

L

%FLC 115.

Find 125% load

1 2 5 L

AMPS 24. ol

Display % used

L

%FLC 125.

Reset overload

rating and clear

1 1 5 L

o 0.

Overload Protection Size

User’s Guide — 51

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) P-80 10) P-40 11) P-A 12) P-EB

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).

Conduit Size

52 — ElectriCalc Pro

Finding Motor Branch-Circuit
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

0.

Set to 1-phase

S 1

1 PH

Set to 60º C

S 6

1Ø 60 Cu 1 PH

Enter Volts

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

FLC 100. A

Find wire size

S w

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

2. TTL WIRES

Find conduit fill %

C

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 3-phase

S 3 o

3Ø 60 Cu 0.

and Clear

User’s Guide — 53

* 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

WIRE SIZE

Enter # THHN

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).

54 — ElectriCalc Pro

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).

User’s Guide — 55

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

0.

Set to 75°

S 7

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 cross-section

wire area

·

THHN 0.5565

WIRE AREA

Enter 2nd wire sz*

2 w

AWG 2 CU

WIRE SIZE

Enter #, type wire

1 Å

XHHW 1.

WIRE

Find cross-sect.

Å

XHHW 0.1146

WIRE AREA

Find conduit size

C

FMC 1.50 in

COND SIZE

(Cont’d)

56 — ElectriCalc Pro

(Cont’d)

Steps Keystrokes Display

Find total # wires

C

4.

TTL WIRES

Find conduit fill %

C

FILL 36.1

COND %

Find actual fill area

C

FILL 0.6711

TTL WIRE AREA

Find remaining area

C

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.

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

Steps Keystrokes Display

Clear calculator

o o

0.

Enter Kilowatt

3 ¥ 5

3.5

Hours

Find Equivalent

S ¥

BTU 11,953.552

BTU

Converting KW-HR and BTU

User’s Guide — 57

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

Steps Keystrokes Display

Clear calculator

o o

0.

Enter BTU

4 5 0 0

4,500.

Rating

Find Equivalent

S =

KW-H 1.3176

Kilowatt Hours

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

Steps Keystrokes Display

Clear calculator

o o

0.

Enter 1

st

Resistor

1 0 S s

P-RS 10.

Enter 2

nd

Resistor

2 0 S s

P-RS 6.6666667

Enter 3

rd

Resistor

5 0 S s

P-RS 5.8823529

NOTE: The total is recalculated with each
additional resistor value entered.

Parallel Resistance

58 — ElectriCalc Pro

The error codes for the

ElectriCalc Pro

are listed below (Note: To clear an
error, perform a Clear All S x):

DISPLAY ERROR DESCRIPTION

OFLO Answer too large to display
ENT Error Invalid or out-of-scale 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.
HP Error Invalid HP entry per NEC table
FULL Error Entered or calculated more than

15 different wires sizes
EROM Error Bad EROM
MATH Error Math error (i.e., divide by zero)

The calculator is powered by a single
3-Volt Lithium CR-2032 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.

Battery Information

Error Codes

User’s Guide — 59

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.

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.

2005 NEC References

60 — ElectriCalc Pro

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.

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, Volt-

age Drop %, Power Factor % and

Efficiency %
(4) Ambient Temperature setting

Semi-Permanent Values

The following semi-permanent values
are cleared to default settings when the
calculator is shut-off:

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

Settings

Updating Future Code
Revisions

User’s Guide — 61

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: 1-800-854-8075

Outside USA: 1-775-885-4900

www.calculated.com/warranty

Repair and Return

62 — ElectriCalc Pro

Warranty Repair Service –
U.S.A.

Calculated Industries (“CI”) warrants
this product against defects in materials
and workmanship for a period of one

(1) year from the date of original
consumer purchase in the U.S. If a

defect exists during the warranty peri­od, CI, at its option, will either repair
(using new or remanufactured parts) or
replace (with a new or remanufactured
calculator) the product at no charge.

THE WARRANTY WILL NOT APPLY TO
THE PRODUCT IF IT HAS BEEN DAM­AGED BY MISUSE, ALTERATION, ACCI­DENT, IMPROPER HANDLING OR OPERA­TION, OR IF UNAUTHORIZED REPAIRS
ARE ATTEMPTED OR MADE. SOME
EXAMPLES OF DAMAGES NOT COVERED
BY WARRANTY INCLUDE, BUT ARE NOT
LIMITED TO, BATTERY LEAKAGE, BEND­ING, ABLACK “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.

Warranty

User’s Guide — 63

Non-Warranty Repair Service
– U.S.A.

Non-warranty 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 non-warranty
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.

64 — ElectriCalc Pro

Disclaimer

CI MAKES NO WARRANTYOR REPRESEN­T ATION, EITHER EXPRESS OR IMPLIED,
WITH RESPECT TO THE PRODUCT’S
QUALITY, PERFORMANCE, MER­CHANTABILITY, OR FITNESS FOR A PAR­TICULAR PURPOSE. AS A RESULT, THIS
PRODUCT, INCLUDING BUT NOT LIMITED
TO, KEYSTROKE PROCEDURES, MATHE­MATICAL ACCURACY AND PREPRO­GRAMMED MATERIAL, IS SOLD “AS IS,”
AND YOU THE PURCHASER ASSUME THE
ENTIRE RISK AS TO ITS QUALITY AND
PERFORMANCE. IN NO EVENT WILL CI BE
LIABLE FOR DIRECT, INDIRECT, SPECIAL,
INCIDENTAL, OR CONSEQUENTIAL DAM­AGES RESULTING FROM ANY DEFECT IN
THE PRODUCT OR ITS DOCUMENTATION.

The warranty, disclaimer, and remedies
set forth above are exclusive and
replace all others, oral or written,
expressed or implied. No CI dealer,
agent, or employee is authorized to
make any modification, extension, or
addition to this warranty.

Some states do not allow the exclusion
or limitation of implied warranties or lia­bility for incidental or consequential
damages, so the above limitation or
exclusion may not apply to you. This
warranty gives you specific rights, and
you may also have other rights, which
vary from state to state.

User’s Guide — 65

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.

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.

1-800-854-8075 • Fax: [phone]

E-mail: [e-mail]

www.calculated.com

ALL RIGHTS RESERVED

Designed in the U.S.A.

Legal Notices

FCC Class B

Printed in China

04/06

UGL5065E-A