# User's Guide | Calculated Industries ElectriCalc Pro 5060 calculator User’s Guide

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Below you will find brief information for ElectriCalc Pro 5060. The ElectriCalc Pro 5060 makes quick work of complicated electrical calculations, helping you meet NEC requirements and complete your projects safely and efficiently. It features a user-friendly interface with easy-to-understand labels, and it’s pre-programmed with the 2002 National Electrical Code. It also includes the ability to update for future NEC revisions, giving you a tool designed to keep up with the times.

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**USER’S**

**GUIDE**

**E**

**LECTRI**

**C**

**AL**

**C ®**

**P**

**RO**

M

ODEL

5060

**3O 60**

**Cu**

**VD WIRE SIZE 125%**

C

ONSTRUCTION

M

ASTER

®

**E**

**LECTRI**

**C**

**ALC**

**®**

**Cond Type**

**P**

**RO Off**

**CondSz**

**Starter**

**HP motor**

**Eff%**

**#THW**

**SEFuse**

**DEFuse milli –**

**#XHHW**

**InsTrip**

**InvTime**

**EqGrnd**

**#THHN**

**M–Type**

**O-Load**

**D/R Size**

**ParSz HP th**

**PF%**

**Watts**

**Set**

**Stor**

**M–R/C**

Rcl x **2**

**% kilo–**

**VA**

75 °

**1**

**M +**

**0**

**7**

**Cu/Al**

**4**

**1Ø**

**Grnd**

**DC Res**

**Volts**

**Ind/Sync**

**8**

**FrAir**

**5**

Amb °

**2**

**Amps**

90 °

**9**

60 °

**6**

**3Ø**

**3**

**On/C**

**Prefs**

**AC**

π

**+ / –**

**VD%**

**Wire Res**

**Length**

**125%**

**WireSz**

√

*___ x*

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**Introducing the**

**ElectriCalc**

**®**

**Now NEC**

**®**

**-Updateable!**

**Pro**

The ElectriCalc ® Pro is an invaluable calculator for today’s busy electrical professional. Unlike a regular calculator, it has intuitively labeled “electrical keys” and conforms to the 2002 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 new feature of the ElectriCalc Pro is that it is now programmed to accept future NEC changes, allowing you to conveniently install future Code editions in a few simple steps.

**User’s Guide — 1**

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The ElectriCalc Pro instantly solves for the following:

♦ Volts, Amps, Volt-Amps, Watts, kVA, kW, PF%, EFF%, and DC

Resistance

♦ Copper or Aluminum Wire Sizes

♦ Parallel & Derated Wire Sizes

♦ Voltage Drop Wire Sizes, % and

Actual Voltage Drops, Voltage

Drop Distances and Wire Resistances

♦ Grounding Conductors Sizes

♦ Motor Full-Load Amps

♦ Overload Protection Sizes

♦ NEMA Starter Sizes

♦ Conduit Sizes

♦ And much more!

**2 — ElectriCalc Pro**

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**Table of Contents**

**Installing NEC Updates . . . . . . . . . . . . . .4**

**Key Definitions . . . . . . . . . . . . . . . . . . .5**

**Preference Settings . . . . . . . . . . . . . . .26**

**Default Settings . . . . . . . . . . . . . . . . .27**

**Basic Math Operations . . . . . . . . . . . . .28**

**Percent Calculations . . . . . . . . . . . . . .28**

**Memory Functions . . . . . . . . . . . . . . . .29**

**Kerchoff’s Law . . . . . . . . . . . . . . . . . .30**

**Motor Horsepower . . . . . . . . . . . . . . . .34**

**Ampacity Wire Sizing . . . . . . . . . . . . . .36**

**Voltage Drop . . . . . . . . . . . . . . . . . . .42**

**Ground Conductor Wire Size . . . . . . . . .48**

**Equip. Grounding Conductor Wire Size . .49**

**Fuse and Circuit Breaker Size . . . . . . . .50**

**Starter Size . . . . . . . . . . . . . . . . . . . .51**

**Overload Protection Size . . . . . . . . . . . .51**

**Conduit Size . . . . . . . . . . . . . . . . . . . .52**

**Error Codes . . . . . . . . . . . . . . . . . . . .57**

**Battery Information . . . . . . . . . . . . . . .57**

**2002 NEC References . . . . . . . . . . . . . .58**

**Updating Future Code Revisions . . . . . . .58**

**Settings . . . . . . . . . . . . . . . . . . . . . . .59**

**Warranty . . . . . . . . . . . . . . . . . . . . . .60**

**Legal Notices . . . . . . . . . . . . . . . . . . .64**

**User’s Guide — 3**

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**Installing NEC Updates**

Your ElectriCalc Pro is now updateable for future National Electrical Code ® editions that are updated every three

(3) years (next Code update is 2005).

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 battery (located back of calculator, top of unit) by sliding battery door out with your thumbnail. Set aside.

c) Using a screwdriver, pop out the square tab located in the middle section on the back of your calculator.

d) Replace it with the new Update tab by inserting it into the slot. e) Replace the battery door. f) Turn calculator on. Your calculator is now updated and ready to use.

**4 — ElectriCalc Pro**

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**Key Definitions**

**Standard Calculator Functions**

**[On/C] — On/Clear**

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

**[Off] — Off**

Turns all power off. Clears the memory and most internal registers.

**[+] [–] [x] [÷] [=]**

Arithmetic operation keys.

**[0] – [9] & [•]**

Used for keying in numbers.

**[%] — Percent**

Four function percent key.

**[ ] Back Space Function**

Used to delete entries one keystroke at a time (unlike the On/C function, which deletes the entire entry).

**User’s Guide — 5**

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**[Set] — Second Function**

Accesses the secondary functions shown above the keys when pressed prior to selection.

**[Stor] — Store**

Used to store values when pressed just before a storage register (i.e., M+,

AMPS, VOLTAGE, etc.).

**Displays: STOR.**

**[Rcl] — Recall**

Recalls a value stored in a register

(e.g., to recall voltage drop % press

[Rcl] [VD%]). **Displays: RCL.**

**[Set] [ + ] — Pi (**

π

**)**

Constant = 3.141593

**[Set] [–] — Change Sign (+/–)**

Toggles the sign of the displayed value

(from positive to negative or from negative to positive).

**[Set] [%] — x 2**

Squares the displayed value.

**[Set] [ ] — Square Root ( x )**

Square root function.

**6 — ElectriCalc Pro**

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**[Stor] [0] — Cumulative Memory **

Adds displayed value to Memory (e.g.,

10 [M+], 20 [M+], [Rcl] [M+] = 30).

Clears when the calculator is shut off.

**[Rcl] [0] — Memory Recall**

Displays the value saved in (M+).

**[Rcl] [Rcl] — Display/Clear Memory**

Displays and clears the value saved in

(M+).

**[Set] [Rcl] — Clear Memory**

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

**Mode Set-up Functions**

**[Set] [x] — All-Clear (AC)**

Resets all settings and values to their default settings.

**[Set] [÷] — Preferences**

Use to set default settings or modes

(see “Preference Settings” page 26)

**[Set] [1] — Single-Phase (1Ø)**

Sets calculator to single-phase mode.

**Displays: 1Ø.**

**User’s Guide — 7**

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**[Set] [3] — Three-Phase (3Ø)**

Sets calculator to three-phase mode.

**Displays: 3Ø.**

**[Set] [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 (**[Set] [x]**).

Defaults to 30°C (86°F). **Amb° **will display when the ambient temperature is other than 30°C (86°F). **Displays:**

**Amb°.**

**NOTE: **The temperature units can be displayed in Celsius (°C) or Fahrenheit

(°F) by using the preference function

(**[Set][÷]**).

**[Set] [4] — Copper/Aluminum**

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 **[Set] [4] **will change the material type without changing the size.

**Displays: Al or Cu.**

**8 — ElectriCalc Pro**

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**[Set] [5] — Free Air (FrAir)**

Sets calculator into Free Air mode, which refers to NEC Table 310-17 for wire size calculations. **Displays: FrAir.**

**[Set] [6] — 60°C Wire Insulation **

Sets calculator to 60°C wire insulation type for wire size calculations. This is the default setting. **Displays: 60.**

**[Set] [7] — 75°C Wire Insulation **

Sets calculator to 75°C insulation type for wire size calculations.

**Displays: 75.**

**[Set] [9] — 90°C Wire Insulation **

Sets calculator to 90°C insulation type for wire size calculations.

**Displays: 90.**

**Electrical Functions**

**[kilo-] — Kilo-**

This key is used with watts, amps, volts, and volt-amps to identify “kilo-” values.

**[Set] [kilo-] — Milli-**

This key sequence is used with other keys watts, amps, volts, and volt-amps to identify “milli-” values.

**User’s Guide — 9**

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**[Amps] — Amps**

Enters or calculates amps (using volts and VA or watts). **Displays: AMPS,**

**KAMP or mAMP.**

**[Volts] — Volts**

Enters or calculates volts (using amps,

HPth, and VA or watts). Default value is

240 volts. **Displays: VOLT, KV, or mV.**

**[Set] [Volts] — DC Resistance**

Calculates and displays DC resistance.

**Displays: OHMS.**

**[VA] — Volt-Amps**

Enters or calculates volt-amps (using amps, volts and horsepower or watts).

**Displays: VA, KVA, or mVA.**

**[Watts] — Watts**

Enters or calculates watts (using amps, volts, and VA or horsepower).

**Displays: WATT, KW, or mW.**

**[Set] [Watts] —Power Factor**

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%.**

**10 — ElectriCalc Pro**

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**[HPth] — 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.**

**[Set] [HPth] — Efficiency**

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%.**

**Motor Horsepower Functions**

The ElectriCalc Pro can be used to determine motor full-load current

(amps) based on entries for motor horsepower (HP), phase and voltage.

You can also find an equivalent motor horsepower if you have entered voltage and full load current values. Only HP and voltage entries as defined by NEC

Tables 430-148 and 430-150 can be used to determine motor loads.

**User’s Guide — 11**

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**[Set] [8] — Induction/ **

**Synchronous Motor Toggle**

Toggles between induction and synchronous motor types. **Displays: SYNC**

(synchronous) or **IND **(induction - default).

**[HPmotor] — Motor Horsepower **

Enters or calculates motor horsepower.

**Displays: SYNC HP **(synchronous) or

**HP IND **(induction - default).

**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.

Only standard AWG wire sizes are used by the ElectriCalc Pro.

**NOTE: **1/0, 2/0, 3/0 and 4/0 wires are entered using the [0] key (i.e., 0, 00,

000 and 0000).

**[WireSz] — Wire Size/Ampacity**

Enters or calculates wire size based on ampacity and voltage drop, if a voltage drop length has been entered.

**12 — ElectriCalc Pro**

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♦ 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.

♦ 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

If a wire length has been entered, displays the minimum wire ampacity rating.

**[Set] [WireSz] — 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%.**

**User’s Guide — 13**

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**[ParSz] — Parallel Size**

Used to find the size of parallel conductors using amperage and an entered quantity of wires. Parallel wire size computations 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.**

♦ Second Press

Displays the maximum adjusted ampacity of the calculated parallel wire size. **Displays: WIRE A.**

**NOTE: **No adjustments are made for deration.

**[Set] [ParSz] — Derated Wire 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 4 wires, or when the unit is in Free Air mode.

**14 — ElectriCalc Pro**

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♦ First Press

Calculates the derated wire size, if you have entered the number of wires, for example, 4 [Set] [ParSz]).

**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 %.**

**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.

**User’s Guide — 15**

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**[VD%] — 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 %.**

**[Length] — Length**

Enters or calculates the length of a run for voltage drop computation.

**Displays: FEET or MET.**

**NOTE: **Units of length can be set to

Feet or Meters by use of the Preference function (**[Set] [÷]**).

**[Set] [Length] — Wire Resistance**

Displays the actual resistance per

1,000 feet of the wire size in [WireSz] based on NEC Chapter 9, Table 8.

**16 — ElectriCalc Pro**

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**Ground Function Keys**

**[Grnd] — 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 — 17**

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**[Set] [Grnd] **

**— Equipment Ground (EqGrnd)**

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

[Set] [Grnd]).

**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.

♦ Second Press

Displays the aluminum grounding conductor size.

**Displays: EQPG WIRE SIZE AL.**

**18 — ElectriCalc Pro**

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**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 Full-

Load Current” multipliers listed in NEC

Table 430-152.

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**.”

**[Set] [O-Load] — Motor Type **

Based on NEC Table 430-152, 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 an all clear (**[Set] [x]**).

**User’s Guide — 19**

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♦ First Press

Displays the current motor type. Note there is no motor type in single-phase mode.

♦ Second Press

In three-phase mode only, subsequent presses of [O-Load] will select and display the next motor type from this list: **SQ-C non-E **(Squirrel Cage, non-

Design E), **SQ-C E **(Squirrel Cage,

Design E), **SYNC no codE **(Synchronous), **WND no codE **(Wound Rotor).

**[DEFuse] — 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.**

**[Set] [DEFuse]**

**— Single Element Fuse (SEFuse) **

♦ First Press

Displays the minimum amp rating based on phase, motor type, and amperage. **Displays: AMPS SE.**

**20 — ElectriCalc Pro**

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♦ Second Press

Displays the full-load current percent multiplier value used to determine fuse size. Subsequent presses repeat this cycle. **Displays: %FLC.**

**[Set] [InvTime] — Instantaneous**

**Trip Circuit Breaker**

♦ 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.**

**[InvTime] — 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.**

**User’s Guide — 21**

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**[O-Load] — 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 [Amps] registers) by 115% or the value you enter. Conforms to NEC Section 430-

32 (a)(1) value of 115% unless you enter another value. For example, entering 125 [O-Load] 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 [O-Load] repeat the cycle. **Displays: %FLC.**

**[Set] [HPmotor] — Starter Size**

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

**22 — ElectriCalc Pro**

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**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 (i.e., 1-1/2” is entered as 1.5, 3/4” is entered as .75, etc.).

**[#THW], [#XHHW], [#THHN]**

**— 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).

**User’s Guide — 23**

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♦ Third Press

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

**[CondSz] — 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 entered or calculated, or an invalid conduit size is entered, the calculator will display “**nonE**.”

♦ Second Press

Shows total number of wires in the conduit for calculated conduit size.

Shows the conduit internal area for an entered conduit. **Displays: TTL WIRES**

(calculated) or **CONDAREA **(entered).

**NOTE: **Third through fifth presses display only for calculated conduit sizes.

**24 — ElectriCalc Pro**

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♦ 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.**

♦ 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.**

**[Set] [CondSz] — Conduit Type**

♦ First Press

Displays the currently selected conduit type.

♦ Second Press

Subsequent presses will display and select the next conduit type from this list: 1) EMT 2) ENT 3) FMC 4) IMC

5) LFNB 6) LFNA 7) LFMC 8) RMC

9) 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 [Set] [CondSz]. If you press this keystroke without entering a number, the calculator will switch to the next conduit type on the list.

**User’s Guide — 25**

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**Preference Settings**

Your calculator has the following Preference Settings that you can access and change at any time.

Reach the Preference Function by pressing **[Set] [÷]**. Then, to access each category, press the **[÷] **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 clear preferences, you must either reset using keystrokes below, or perform an

All-Clear (**[Set] [x]**).

The Preference Settings are (default settings shown first):

**To Set 1999 or 1996 NEC Code:**

[Set] [÷] (1st press of [÷])

[+]

**CODE 99**

**CODE 96**

**To Set Ambient Temp. to °C or °F:**

**[÷] (2nd press of [÷]) AMB° 30 °C**

**[+] AMB° 86 °F**

**To Set Length to Feet or Meter:**

**[÷] (3rd press of [÷]) FEET 1.**

**[+] MET 1.**

**26 — ElectriCalc Pro**

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**Default Settings**

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 with an All-Clear (**[Set] [x]**).

**Ambient Temperature 30°C**

**Insulation Rating 60°C**

**Material Copper (Cu)**

**Phase**

**Volts**

**Efficiency**

**Power Factor**

**3Ø**

**240 V**

**100%**

**100%**

**Length Units**

**Voltage Drop Percent**

**Wire Environment**

**(vs Free Air)**

**Feet**

**3%**

**Raceway**

**User’s Guide — 27**

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**Basic Math Operations**

This calculator uses standard chaining logic, which simply means that you enter your first value, the operator (+, –, x, ÷), the second value and then the equals sign (=).

A.

3 [+] 2 [=] 5

B.

3 [–] 2 [=] 1

C.

3 [x] 2 [=] 6

D.

3 [÷] 2 [=] 1.5

**Percent Calculations**

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 [%]

250 [+] 6.5

[%]

25 [–] 5 [%]

100 [÷] 50 [%]

53.25

266.25

23.75

200.

The percent key also allows you to change percentages to decimals (e.g.,

25 [%] 0.25).

**28 — ElectriCalc Pro**

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**Memory Functions**

Whenever the **[Stor] [0] (M+) **keys are pressed, the displayed value will be added to memory. A list of memory keystrokes/functions is provided below:

**Function Keystrokes**

Add to memory

Display total in memory

**[Stor] [0]**

**[Rcl] [0]**

**Display & clear memory [Rcl] [Rcl]**

**Clear memory, no display [Set] [Rcl]**

**Replace memory with displayed value [Set] [Rcl] [Stor] [0]**

The memory is semi-permanent; it will be cleared when you:

1) turn off the calculator;

2) press **[Rcl] [Rcl]**;

3) press **[Set] [Rcl]**;

4) press **[Set] [x] **(all clear).

**How To Use Memory Functions:**

**Steps Keystrokes Display**

Reset calculator [On/C]

Add to M+ 355 [Stor] [0]

Add to M+

Recall total M+

Sub. from M+

255 [Stor] [0]

[Rcl] [0]

745 [Set]

Recall & clear

[Stor] [0]

[Rcl] [Rcl]

0.

355. M

255. M

610. M

745. M

– 135.

**User’s Guide — 29**

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**Kerchoff’s Law**

The ElectriCalc Pro utilizes Kerchoff’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**

Clear calculator [On/C] [On/C]

Set to 1-phase

Enter VA

[Set] [1]

14605 [VA]

Enter amps

Solve for volts

115 [Amps]

[Volts]

**Display**

0.

1 PH

14,605. VA

115. AMPS

127. VOLT

**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 [On/C] [On/C]

Set to 3-phase

Enter VA

[Set] [3]

8250 [VA]

0.

3 PH

8,250. VA

Enter volts 240 [Volts] 240. VOLT

Solve for amps [Amps] 19.846416 AMPS

**30 — ElectriCalc Pro**

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**Finding Current Load**

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

Range = 7,800 VA

Dryer = 5,100 VA

Lighting = 6,470 VA

Heating = 15,100 VA

Appliances = 8,900 VA

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

**Steps Keystrokes Display**

Clear calculator [On/C] [On/C]

Set to 1-phase [Set] [1]

Add VA loads: 7,800 + 15,100 +

5,100 + 8,900 +

6,470 [=]

0.

1 PH

43,370.

Enter as VA

Enter volts

[VA]

240 [Volts]

43,370. VA

240. VOLT

Solve for amps [Amps] 180.70833 AMPS

**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 [On/C] [On/C]

Set to 3-phase [Set] [3]

0.

3 PH

Enter kilowatts

Enter volts

75 [kilo-] [Watts]

208 [Volts]

75. KW

208. VOLT

Solve for amps [Amps] 208.17918 AMPS

**User’s Guide — 31**

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**Finding Volt-Amps**

What is the VA rating for a 120 volt, 22 amp, 1Ø circuit? What is the kVA rating?

**Steps Keystrokes**

Clear calculator [On/C] [On/C]

Set to 1-phase [Set] [1]

Enter volts

Enter amps

120 [Volts]

22 [Amps]

Solve volt-amps [VA]

Solve for kVA [kilo-] [VA]

**Display**

0.

1 PH

120. VOLT

22. AMPS

2,640. VA

2.64 KVA

**Finding kVA Rating**

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

**Steps Keystrokes Display**

Reset calculator [Set] [x] [On/C]

Enter volts

Enter amps

Solve for kVA

208 [Volts]

65 [Amps]

0.

208. VOLT

65. AMPS

[kilo-] [VA] 23.417327 KVA

**32 — ElectriCalc Pro**

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**Finding Wattage**

A 120 volt single-phase 45 amp electrical motor has an 87% power factor.

What is its wattage?

**Steps Keystrokes Display**

Clear calculator [On/C] [On/C]

Set to 1-phase [Set] [1]

0.

1 PH

Enter volts 120 [Volts] 120. VOLT

Set power fact % 87 [Set] [Watts] 87. PF%

Enter amps

Solve for watts

45 [Amps]

[Watts]

45. AMPS

4,698. WATT

**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 [On/C] [On/C]

Set to 3-phase [Set] [3]

0.

3 PH

Set power factor 100 [Set] [Watts] 100. PF%

Enter amps 90 [Amps] 90. AMPS

Enter volts 208 [Volts] 208. VOLT

Solve for kW [kilo-] [Watts] 32.423991 KW

**User’s Guide — 33**

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**Motor Horsepower**

The ElectriCalc Pro can calculate the full load current (amps) of a motor, based on phase, voltage and motor

(synchronous or induction). It uses

NEC Tables 430-148 and 430-150 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 Error 8).

The ElectriCalc Pro can also calculate an equivalent horsepower for either an induction or a synchronous 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

430-148 or 430-150 will cause the calculator to choose the next higher table value for motor horsepower.

**34 — ElectriCalc Pro**

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**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**

Reset calculator [On/C]

Set to 1-phase [Set] [1]

Enter volts

Enter HPind

230 [Volts]

2 [HPmotor]

Find full load amps [Amps]

0.

1 PH

230. VOLT

2. HP IND

12. FLC A

**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**

Reset calculator [Set] [x] [On/C]

Enter volts

Enter HPind

230 [Volts]

3 [HPmotor]

0.

230. VOLT

3. HP IND

Find load current [Amps] 9.6 FLC A

Find 125% A size [Set] [WireSz] 14 CU AWG

WIRE SIZE 125%

Find max ampacity [WireSz] 14 20.0

WIRE A125%

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

**User’s Guide — 35**

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**Finding Synchronous Motor**

**Horsepower**

A synchronous motor is defined as having a 27 amp load on a 240 volt, 3Ø circuit. What is its horsepower?

**Steps Keystrokes Display**

Reset calculator [On/C]

Set to synch.

Enter volts

Enter amps

Solve for Hp

[Set] [8]

240 [Volts]

27 [Amps]

[HPmotor]

0.

0. SYNC

240. VOLT

27. AMPS

25. HP SYNC

**Ampacity Wire Sizing**

The required wire size of a service conductor can be determined based on the specified electrical requirements and the [WireSz] 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.

**36 — ElectriCalc Pro**

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**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 [On/C] [On/C]

Set to 1-phase

Set to 60˚C

[Set] [1]

0.

1 PH

[Set] [6] 1Ø 60 Cu 1 PH

Enter kVA

Enter volts

Find amps

30 [kilo-] [VA]

240 [Volts]

[Amps]

Find CU wire size [WireSz]

30. KVA

240. VOLT

125. AMPS

0 CU

AWG WIRE SIZE

**Re-sizing Wire Based on **

**Different Insulation Ratings**

What wire size is required for a 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**

Reset calculator [Set] [x] [On/C]

Set to 75°C

Enter amps

Find wire size

[Set] [7]

260 [Amps]

[WireSz]

0.

3Ø 75 Cu 0.

260. AMPS

300 CU

Change to 90˚ [Set] [9]

AWG WIRE SIZE

0000 CU

AWG WIRE SIZE

**User’s Guide — 37**

5060-UG-B-Composite 4/4/03 12:37 PM Page 40

**Wire Sizing Based on Ambient Temperature**

Find the 90°C aluminum 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 [On/C] [On/C]

Set to 1-phase

Set to 90°C

[Set] [1]

0.

1 PH

[Set] [9] 1 Ø 90 Cu 1 PH

Set toAl

Enter VA

Enter volts

[Set] [4] 1 Ø 90 Al 1 PH

47700 [VA] 47,700. VA

240 [Volts] 240. VOLT

Find amps

Find wire size

[Amps]

[WireSz]

198.75 AMPS

0000 AL

AWG WIRE SIZE

Change ambient temperature

Find adjusted wire size

40 [Set] [2] AMB° 40.˚C

[WireSz] 250 AL

Reset amb. temp 30 [Set] [2]

AWG WIRE SIZE

AMB° 30.˚C

***NOTE: **Ambient temperature will remain at 40°C unless you change it or perform an ALL CLEAR (**[Set] [x]**).

**38 — ElectriCalc Pro**

5060-UG-B-Composite 4/4/03 12:37 PM Page 41

**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**

Reset calculator [Set] [x] [On/C]

Set to 75°C [Set] [7]

0.

3Ø 75 Cu 0.

Enter amps 265 [Amps] 265. AMPS

Find wire size [WireSz]

Change to alum.

[Set] [4]

300 CU

AWG WIRE SIZE

400 AL

AWG WIRE SIZE

**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?

**User’s Guide — 39**

5060-UG-B-Composite 4/4/03 12:37 PM Page 42

(Cont’d)

**Steps Keystrokes Display**

Reset calculator [Set] [x] [On/C]

Find 2 wire size 2 [ParSz]

0.

Set free air mode [Set] [5] 3Ø 60 FrAir Cu 0.

Enter amps 500 [Amps] 500. AMPS

Find 1 wire size [WireSz] 500 CU

AWG WIRE SIZE

000 CU

Find 3 wire size 3 [ParSz]

PAR WIRE SIZE

0 CU

PAR WIRE SIZE

**NOTE: **Parallel wire sizes smaller than

1/0 will be displayed as nonE.

**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**

Reset calculator [Set] [x] [On/C]

Set to 75°C

Enter amps

[Set] [7]

65 [Amps]

0.

3Ø 75 Cu 0.

65. AMPS

Find normal wire size [WireSz] 6 CU

AWG WIRE SIZE

Find derated wire size 9 [Set] [ParSz] 3 CU

D/R WIRE SIZE

**40 — ElectriCalc Pro**

5060-UG-B-Composite 4/4/03 12:37 PM Page 43

**Sizing Temperature-Adjusted**

**Derated Wires**

A circuit was built with 90°C aluminum wire connecting a 47,650 volt-amp load to a 240 volt, single-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**

Reset calculator [On/C]

Set to 1-phase [Set] [1]

0.

1 PH

Set to 90°C [Set] [9] 1Ø 90 Cu 1 PH

Toggle to alum.

[Set] [4] 1Ø 90 Al 1 PH

Enter volt-amps 47650 [VA] 47,650. VA

Enter volts 240 [Volts] 240. VOLT

Set to 50°C amb 50 [Set] [2] AMB° 50˚ C

Find adjst wire sz. [WireSz]

Find derated

300 AL

AWG WIRE SIZE

8 [Set] [ParSz] 500 AL wire size D/R WIRE SIZE

**NOTE: **Ambient temperature should be changed back to 30°C to avoid conflicts in answers through out the rest of this manual.

Reset to 30°C 30 [Set] [2] AMB° 30˚ C

**User’s Guide — 41**

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**Voltage Drop**

The reduction in voltage between the power source and the load can be determined by entering the phase, volts, amps, wire material, voltage drop wire size and length of run. The calculator determines resistance and then the voltage reduction. Voltage drop can be displayed as volts dropped, or as a percent reduction of potential load.

This calculator also finds voltage drop wire size once you have entered or calculated the phase, volts, amps, length, wire type, and allowable VD percentage. It will solve for the distance

([Length]) 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 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.

**42 — ElectriCalc Pro**

5060-UG-B-Composite 4/4/03 12:37 PM Page 45

**IMPORTANT NOTE ON **

**VOLTAGE DROP CALCULATIONS**

The ElectriCalc Pro calculates voltage drop and wire size using DC resistance as defined by the 2002 NEC. To find the voltage drop for a specific wire size, you must first enter amps and the oneway wire length (and other required variables), entering the specific wire size last. Otherwise, for your safety the calculator will recalculate the wire sizes based on the ‘99 NEC Ampacity Tables and maximum allowable voltage drop.

### Finding 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**

Reset calculator [Set] [x] [On/C]

Set to 1-phase

Set to 75°C

[Set] [1]

0.

1 PH

[Set] [7] 1Ø 75 Cu 1 PH

Enter amps

Enter volts

Enter length

Enter wire size

11 [Amps]

208 [Volts]

175 [Length]

8 [WireSz]

11. AMPS

208. VOLT

175. FEET

8 CU

Solve volt. drop

Solve % v.drop

[VD%]

[VD%]

AWG WIRE SIZE

3.0 DROP V

1.4 DROP V %

**User’s Guide — 43**

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**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 conduc-tor. What is the voltage drop on this branch circuit?

**Steps Keystrokes Display**

Reset calculator [Set] [x] [On/C]

Set to 75°C

Enter amps

[Set] [7]

20 [Amps]

0.

3Ø 75 Cu 0.

20. AMPS

Enter volts 230 [Volts]

Enter length(feet) 150 [Length]

Enter VD wire size10 [WireSz]

230. VOLT

150. FEET

10 CU

Solve volt. drop

Solve % v.drop

[VD%]

[VD%]

AWG WIRE SIZE

6.4 DROP V

2.8 DROP V %

**44 — ElectriCalc Pro**

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**Finding Voltage Drop Wire Size**

A 20-amp single-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 re-quired for this branch circuit?

**Steps Keystrokes Display**

Reset calculator [On/C]

Set to 75°C [Set] [7]

Set to 1-phase

Enter amps

Enter volts

[Set] [1]

20 [Amps]

208 [Volts]

0.

3Ø 75 Cu 0.

1 PH

20. AMPS

208. VOLT

Enter distance 175 [Length]

Enter allow. VD% 3 [VD%]

Find wire size [WireSz]

175. FEET

3.0 DROP V %

8 CU

AWG VD WIRE SIZE

Find actual voltage drop

Find % v.drop

[VD%]

[VD%]

5.4 DROP V

2.6 DROP V %

**User’s Guide — 45**

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**Finding Voltage Drop Distance**

How far from a single-phase 240-volt source can you install a 15 amp load using 60°C #10 Al branch circuit conductors? Assume a 3% allowable voltage drop.

**Steps Keystrokes Display**

Reset calculator [Set] [x] [On/C]

Set to 1-phase [Set] [1]

Set to aluminum [Set] [4] 1Ø 60 Al 1 PH

Enter amps 15 [Amps] 15. AMPS

Enter volts 240 [Volts] 240. VOLT

Enter wire size

0.

1 PH

Enter 3% VD

Find distance

Find actual

10 [WireSz] 10 AL

AWG WIRE SIZE

3 [VD%] 3.0 DROP V %

[Length] 123.77387 FEET voltage drop

Find % v.drop

[VD%] 7.2 DROP AL V

[VD%] 3.0 DROP AL V %

**NOTE: **The calculator automatically makes adjustments for resistance using

NEC Chap 9, Table 8, if the insulation type is other than 75°C.

**46 — ElectriCalc Pro**

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**Finding Voltage Drop**

**Resistance**

What is the resistance of 85 feet of #2

90°C copper conductor?

**Steps Keystrokes Display**

Reset calculator [Set] [x] [On/C]

Set to 90°C mode [Set] [9]

0.

3Ø 90 Cu 0.

Enter wire size

Find resistance

2 [WireSz] 2 CU

AWG WIRE SIZE

[Set] [Length] 0.2033993

OHMS WIRE

Find 85 ft resist* [÷] 1000 [x] 85 [=] 0.0172889

***NOTE: **Given resistance per 1000 feet, divide by 1000 to get a per foot resistance, then multiply by 85.

**Finding DC Resistance**

What is the equivalent resistance of a

12 volt DC circuit pulling 5 amps?

**Steps Keystrokes**

Reset calculator [On/C]

Enter voltage

Enter amps

Find resistance

12 [Volts]

5 [Amps]

[Set] [Volts]

**Display**

0.

12. VOLT

5. AMPS

2.4 OHMS

**User’s Guide — 47**

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**Ground Conductor Wire Size**

You can use single or multiple service entrance conductor(s) to find the grounding electrode conductor for AC systems. When using multiple conductors, the ElectriCalc Pro uses the equivalent circular mils to find the grounding electrode conductor (based on NEC Table 250-66).

Find the grounding electrode conductor wire size required when 2/0 is the largest 3-phase 75°C copper serviceentrance conductor being used. What is the equivalent aluminum size? What is the equivalent circular mils?

**Steps Keystrokes Display**

Reset calculator [On/C]

Set cond. temp.

[Set] [7]

Enter wire size 00 [WireSz]

Find grnd wire sz [Grnd]

0.

3Ø 75 Cu 0.

00 CU

AWG WIRE SIZE

4 CU

Find alum size

Find circular mils

[Grnd]

[Grnd]

GRND WIRE SIZE

2 AL

GRND WIRE SIZE

133,100.

CMIL WIRE

**48 — ElectriCalc Pro**

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**Equip. Grounding Conductor**

**Wire Size**

The [Set] [Grnd] 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**

Reset calculator [On/C]

Set cond. temp.

[Set] [9]

Enter amp rating 45 [Amps]

Find equip. grnd.

wire size

Find alum size

0.

3Ø 90 Cu 0.

45. AMPS

[Set] [Grnd] 10 CU

EQPG WIRE SIZE

[Grnd] 8 AL

EQPG WIRE SIZE

**User’s Guide — 49**

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**Fuse and Circuit Breaker Size**

What is the computed 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**

Reset calculator [On/C]

Enter volts 230 [Volts]

Enter hp 50 [HPmotor] 50. HP IND

Find full current [Amps] 130. FLC A

Find DE fuse size [DEFuse]

0.

230. VOLT

Display % used [DEFuse]

Find SE fuse size [Set] [DEFuse]

227.5

dE AMPS

175. %FLC

390.

SE AMPS

Display % used [DEFuse] 300. %FLC

Find inv. time brkr [InvTime] 325. b2 AMPS

Display % used [InvTime] 250. %FLC

Find ins. trip breaker sz.

[Set] [InvTime]

Display % used [InvTime]

1,040.

b1 AMPS

800. %FLC

**50 — ElectriCalc Pro**

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**Starter Size**

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

**Steps Keystrokes Display**

Reset calculator [On/C]

Enter volts 575 [Volts]

Enter hp

Solve for

0.

575. VOLT

20 [HPmotor] 20. HP IND starter size [Set] [HPmotor] 2

STAR SIZE

**Overload Protection Size**

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**

Reset Calculator [On/C]

Enter volts 460 [Volts]

0.

460. VOLT

Enter horsepower 15 [HPmotor] 15. HP IND

Enter nameplate current 19.2 [Amps] 19.2 AMPS

Find overload size [O-Load] 22.08 ol AMPS

Display % used [O-Load]

Find 125% load 125 [O-Load]

115. %FLC

24.

Display % used [O-Load] ol AMPS

125 %FLC

**User’s Guide — 51**

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**Conduit Size**

The ElectriCalc Pro can calculate the size of conduit required when running single or multiple wires using the

[CondSz] key and the calculator’s internal tables. The calculator uses NEC values for area of THW, THHN, and

XHHW 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 [Set] [CondSz]. 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).

**52 — ElectriCalc Pro**

5060-UG-B-Composite 4/4/03 12:37 PM Page 55

**Finding Motor Branch-Circuit**

**Wire Size & Conduit Size —**

**Same Wire Type & Size**

What size THHN copper wire & RMC conduit are needed to connect a 10 HP

1Ø induction motor to a 115 volt source?

**Steps Keystrokes Display**

Reset calculator [Set] [x] [On/C] 0.

Set to 1-phase

Enter volts

[Set] 1

115 [Volts]

1 PH

115. VOLT

Enter horsepower 10 [HPmotor] 10. HP IND

Enter cond. type 8 [Set] [CondSz] nonE

RMC

Display full load amps

Find wire size

[Amps]

[Set] [WireSz]

100. FLC A

0 CU

AWG WIRE SIZE 125%

Find wire ampacity [WireSz] 0 125.0*

Find conduit size [CondSz]

WIRE A125%

1.25 in

RMC COND SIZE

Find total # wires [CondSz] 2. TTL WIRES

Find conduit fill % [CondSz] 24.3

Find act. fill area [CondSz]

FILL COND %

0.3710

FILL TTL WIRE AREA

Find rem. area [CondSz] 0.1021

REM WIRE AREA

**NOTE: **Display will also show wire size in upper left when displaying maximum ampacity rating.

**User’s Guide — 53**

5060-UG-B-Composite 4/4/03 12:37 PM Page 56

**NOTE: **If a wire size has been calculated or stored, and the wire type/quantity is not defined, the calculator will assume 2 THHN wires for 1Ø and 3 THHN wires for 3Ø when calculating conduit size.

**Finding Conduit Sizes for Multiple Conductors — Same Wire**

**Type & Size**

Find the minimum IMC conduit size for eleven #6 THHN copper wires.

**Steps Keystrokes Display**

Clear calculator

Enter cond. type

Enter wire size

Enter # THHN

[On/C] [On/C]

4 [Set] [CondSz]

0.

nonE

IMC

6 [WireSz]

11 [#THHN]

6 CU

AWG WIRE SIZE

11.

Find conduit size [CondSz]

THHN WIRES

1.25 in

IMC COND SIZE

**54 — ElectriCalc Pro**

5060-UG-B-Composite 4/4/03 12:37 PM Page 57

**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” EMT conduit.

How many XHHW wires? How many

THW wires?

**Steps Keystrokes Display**

Clear calculator [On/C] [On/C]

Enter cond. type 1 [Set] [CondSz]

Enter wire size 10 [WireSz]

0.

EMT nonE COND

10 CU

Enter conduit size 3 [CondSz]

AWG WIRE SIZE

3.00 in

EMT COND SIZE

Find max THHN # [#THHN] 167.

THHN TTL WIRES

Find max XHHW# [#XHHW] 145.

XHHW TTL WIRES

Find max THW # [#THW] 145.

THW TTL WIRES

**Finding Conduit Size - Multiple**

**Conductors Different Wire Sizes**

**& 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 cross-

**User’s Guide — 55**

5060-UG-B-Composite 4/4/03 12:37 PM Page 58 sectional area of wires, conduit size and actual fill area? (Use [THHN] for

THWN; the cross-sectional areas are the same.)

**Steps Keystrokes Display**

Clear calculator [On/C] [On/C]

Set to 75° [Set] [7]

0.

1Ø Cu 75 0.

Enter cond. type 3 [Set] [CondSz] nonE

FMC COND

Enter 1st wire sz 0 [WireSz] 0 CU

AWG WIRE SIZE

Enter #, type wire 3 [#THHN] 3.

THHN WIRES

Find cross-sect.

wire area [#THHN] 0.5565

Enter 2nd wire sz 2 [WireSz]

THHN WIRE AREA

2 CU

Enter #, type wire 1 [#XHHW]

AWG WIRE SIZE

1.

Find cross-sect.

[#XHHW]

XHHW WIRE

0.1146

Find conduit size [CondSz]

XHHW WIRE AREA

1.50 in

Find total # wires [CondSz]

Find conduit fill % [CondSz]

FMC COND SIZE

4.

TTL WIRES

36.1

Find act. fill area

Find rem. area

[CondSz]

[CondSz]

FILL COND %

0.6711 FILL

TTL WIRE AREA

0.0717

REM WIRE AREA

**56 — ElectriCalc Pro**

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**Error Codes**

The error codes for the ElectriCalc Pro are listed below (Note: To clear an error, simply press any key):

2

3

**Error Description**

1 Display register overflow

(Answer too large to fit display)

Invalid or out-of-scale entry

PF or EFF calculated above 100%

4

5

Conduit Size beyond limits of table

Unable to calculate VDWire Size

(Amps/Length too high)

Invalid HP entry per NEC table 8

9 Entered or calculated more than 15 different wires sizes

11 Temperature setting out of range for wire computation.

**Battery Information**

The calculator is powered by a single 3-

Volt Lithium CR-2032 battery. This should last upwards of 800 hours of actual use (1 year plus for most people). If the display becomes very dim or erratic, replace the battery.

**NOTE: **Please use caution when dispos-ing of your old batteries as they contain hazardous chemicals.

**User’s Guide — 57**

5060-UG-B-Composite 4/4/03 12:37 PM Page 60

**2002 NEC References**

**Table 250-66 **

**Table 250-122**

**Table 310-15(b)(2)(a)**

**Table 310-16 **

**Table 310-17**

**Chapter 9, Table 1, 4, 5 and 8**

**Section 430-32 **

**Table 430-148**

**Table 430-150 **

**Table 430-152**

**Appendix C**

**Updating Future Code **

**Revisions**

This model is updateable for future

NEC Editions. For information on 2005 and 2008 Codes, contact the dealer where this calculator was purchased or you may contact Calculated Industries,

Inc. in the fall of the year prior.

**58 — ElectriCalc Pro**

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**Settings**

**Permanent Values/Settings**

Values and settings maintained in permanent memory can only be changed

(1) by pressing **[Set] [x] **(resets calculator to default settings), or (2) by changing each one or all of these settings.

The following are permanent values:

**(1) Selectable (60°C/75°C/90°C) insulation ratings and CU/AL wire type ratings**

**(2) Phase setting (1Ø/3Ø)**

**(3) The entered values for volts, voltage drop %, power factor % and efficiency %**

**Semi-Permanent Values**

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

**(1) Independent User Memory**

**(2) Free Air mode**

**User’s Guide — 59**

5060-UG-B-Composite 4/4/03 12:37 PM Page 62

**Warranty**

**Warranty Repair Service – **

**U.S.A.**

Calculated Industries, Inc. (“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 unit) the product at no charge.

THE WARRANTY WILL NOT APPLY TO

THE PRODUCT IF IT HAS BEEN DAM-

AGED BY MISUSE, ALTERA-

DLING OR OPERATION, OR IF UN-

AUTHORIZED REPAIRS ARE AT-

TEMPTED OR MADE. SOME EXAM-

PLES OF DAMAGES NOT COVERED

BY WARRANTY INCLUDE, BUT ARE

NOT LIMITED TO, BATTERY LEAK-

AGE, BENDING, OR VISIBLE CRACK-

ING OF THE LCD, WHICH ARE PRE-

SUMED TO BE DAMAGES RESULT-

ING FROM MISUSE OR ABUSE.

To obtain warranty service in the U.S., ship the product postage paid to the CI

Authorized Service Provider listed on the back page of the User’s Guide.

**60 — ElectriCalc Pro**

5060-UG-B-Composite 4/4/03 12:37 PM Page 63

Please provide an explanation of the service requirement, your name, address, day phone number and dated proof of purchase (typically a sales receipt). If the product is over 90 days old, include payment of $6.95 for return shipping and handling within the contiguous 48 states. (Outside the contiguous 48 states, please call CI for return shipping costs.)

A repaired or replacement product assumes the remaining warranty of the original product or 90 days, whichever is longer.

**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 the CI Authorized Service Provider listed on the back page of the

User’s Guide to obtain current product repair information and charges. Repairs are guaranteed for 90 days.

**User’s Guide — 61**

5060-UG-B-Composite 4/4/03 12:37 PM Page 64

**Repair Service – **

**Outside the U.S.A.**

Not all countries have CI Authorized

Service Providers or the same warranty and service policies. 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.

**Disclaimer**

CI MAKES NO WARRANTY OR REP-

RESENTATION, EITHER EXPRESS

OR IMPLIED, WITH RESPECT TO

THE PRODUCT’S QUALITY, PER-

FORMANCE, MERCHANTABILITY,

OR FITNESS FOR A PARTICULAR

PURPOSE. AS A RESULT, THIS

PRODUCT, INCLUDING BUT NOT

LIMITED TO, KEYSTROKE PROCE-

DURES, MATHEMATICAL ACCU-

RACY AND PREPROGRAMMED MA-

TERIAL, 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,

**62 — ElectriCalc Pro**

5060-UG-B-Composite 4/4/03 12:37 PM Page 65

INCIDENTAL, OR CONSEQUENTIAL

DAMAGES RESULTING FROM ANY

DEFECT IN THE PRODUCT OR ITS

DOCUMENTATION.

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

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

**FCC Class B**

This equipment has been certified to comply with the limits for a Class B computing device, pursuant to Subpart

J of Part 15 of FCC rules.

**User’s Guide — 63**

5060-UG-B-Composite 4/4/03 12:37 PM Page 66

**Legal Notices**

Software copyrighted and licensed to

Calculated Industries, Inc. by Specialty

Calculator Technologies, LLC, 2002.

User’s Guide is copyrighted by Calculated Industries, Inc., 2002.

ElectriCalc and Calculated Industries are registered trademarks of Calculated

Industries, Inc.

**ALL RIGHTS RESERVED**

**Calculated Industries, Inc.**

**4840 Hytech Drive**

**Carson City, NV 89706 U.S.A**

**775/885-4975 o Fax: 775/885-4949**

**E-mail: [email protected]**

**http://www.calculated.com**

File: 5060-UG-B

**64 — ElectriCalc Pro**

5060-UG-B-Composite 4/4/03 12:37 PM Page 67

5060-UG-B-Composite 4/4/03 12:37 PM Page 68

Printed in China

5060-UG-B • 2/02

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### Key Features

- NEC-Updateable
- Solves for volts, amps, VA, watts, kVA, kW, PF%, EFF%, and DC resistance
- Determines copper or aluminum wire sizes
- Calculates parallel and derated wire sizes
- Calculates voltage drop wire sizes, % and actual voltage drops
- Finds grounding conductors sizes
- Calculates motor full-load amps
- Calculates overload protection sizes
- Calculates NEMA starter sizes
- Calculates conduit sizes

### Related manuals

### Frequently Answers and Questions

###### How do I install the NEC update chip?

###### How do I set the ambient temperature?

###### How do I calculate the voltage drop?

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#### Table of contents

- 6 Installing NEC Updates
- 7 Key Definitions
- 28 Preference Settings
- 29 Default Settings
- 30 Basic Math Operations
- 30 Percent Calculations
- 31 Memory Functions
- 32 Kerchoff’s Law
- 36 Motor Horsepower
- 38 Ampacity Wire Sizing
- 44 Voltage Drop
- 50 Ground Conductor Wire Size
- 51 Equip. Grounding Conductor Wire Size
- 52 Fuse and Circuit Breaker Size
- 53 Starter Size
- 53 Overload Protection Size
- 54 Conduit Size
- 59 Error Codes
- 59 Battery Information
- 60 2002 NEC References
- 60 Updating Future Code Revisions
- 61 Settings
- 62 Warranty
- 66 Legal Notices