Calculated Industries ElectriCalc LT Manuale utente

ElectriCalc

An Electrician's Utility for Wiring

User's Guide

IMPORTANT NOTE ON

USER RESPONSIBILITY

Due to the serious nature of electrical

installations, the user of this calculator

must be certain that he or she is using it

correctly, i.e., in accordance with both

the following instructions and National

Electrical Code®requirements.

This tool was designed to work with the

1999 NEC®, not replace it. Users, espe-

cially those unfamiliar with the Code,

should exercise appropriate caution.

If questions arise as to the correctness

of an answer given by the calculator, or

if an answer appears to conflict with the

Code, the user should always defer to

the Code.

If used responsibly and correctly, this

tool will save the user hours of tedious

calculation and look-up time, reduce

material costs, and provide safe, accu-

rate, Code-legal answers.

National Electrical Code and NEC are

registered trademarks of the National

Fire Protection Association, Inc.,

Quincy, MA 02269

User's Guide — 1

Introducing the

ElectriCalc®LT

The

ElectriCalc

is an invaluable

calculator for today’s busy electrical

professional. Unlike a regular calculator,

it has intuitively labeled “electrical keys”

and conforms to the 1999

National

Electrical Code,

allowing you to solve

Code-related problems quickly and

accurately. Common NEC tables are

built in, providing instant solutions 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 Resis-

tances

♦Grounding Conductors Sizes

♦And much more!

2 — ElectriCalc LT

Table of Contents

Key Definitions

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.................

Default Settings

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..............

Basic Math Operations

................................

Percent Calculations

................................

......

Memory Functions

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.........

Kerchoff’s Law

................................

................

Ampacity Wire Sizing

................................

.....

Voltage Drop

................................

...................

Error Codes

................................

.....................

1999 NEC References

................................

.....

Battery Information

................................

........

Settings

................................

...........................

Warranty

................................

..........................

Legal Notices

................................

..................

User's Guide — 3

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.

[Set] — Second Function

Accesses the secondary functions

shown above the keys when pressed

prior to selection.

[Rcl] — Recall

Recalls a value stored in a register

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

[Rcl] [VD%]).

[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.

4 — ElectriCalc LT

[M+] — Cumulative Memory

Adds displayed value to Memory (e.g.,

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

Clears when the calculator is shut off.

[Set] [M+] — Memory Minus (M−)

Subtracts the displayed value from

Memory.

[+] [–] [x] [÷] [=]

Arithmetic operation keys.

[Set] [–] — Change Sign (+/–)

Toggles the sign of the displayed value

(from positive to negative or from nega-

tive to positive).

[Set] [÷] — Reciprocal (1/x)

Reciprocal, or 1/x function.

[0] – [9] & [ • ]

Digits used for keying in numbers.

[Set] [ . ] — x2

Squares the displayed value.

[%] — Percent

Four function percent key.

[Set] [%] — Square Root ( x )

Square root function.

User's Guide — 5

Mode "Set-Up" Functions

[Set] [x] — All-Clear (AC)

Resets all settings and values to their

default settings.

[CU/AL] — 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 [CU/AL] will change

the material type without changing the

size.

Displays: Al or Cu

[Set] [1] — Single-Phase (1Ø)

Sets calculator to single-phase mode.

Displays: 1Ø.

[Set] [3] — Three-Phase (3Ø)

Sets calculator to three-phase mode.

Displays: 3Ø.

[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.

6 — ElectriCalc LT

[Set] [9] — 90°C Wire Insulation

Sets calculator to 90°C insulation type

for wire size calculations. Displays: 90.

[Set] [2] — Ambient Temperature

Permanently enters ambient tempera-

ture 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 dis-

play when the ambient temperature is

other than 30°C (86°F).

Displays: Amb°.

[Set] [4] — Feet/Meters Toggle

Toggles between feet and meters.

Displays: FEET or MET.

[Set] [5] — Free Air (FrAir)

Sets calculator into Free Air mode,

which refers to NEC Table 310-17 for

wire size calculations. Revises back to

Raceway mode when calculator is pow-

ered down. Displays: FrAir.

[Set] [+] — °C/°F Toggle

Toggles ambient temperature format

between °C and °F. Converts displayed

temperature value automatically.

Displays: °C or °F.

User's Guide — 7

Electrical Functions

[kilo-] — Kilo-

This key is used with watts, amps, volts,

and volt-amps to identify "kilo-" values.

[Set] [kilo-] — Milli-

This key is used with other keys watts,

amps, volts, and volt-amps to identify

"milli-" values.

[Amps] — Amps

Enters or calculates amps (using volts

and VA or watts). Displays: AMPS,

KAMP.

[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.

8 — ElectriCalc LT

[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 per-

centage (based on watts and VA). De-

faults to 100%. Entered or calculated

power factors greater than 100% will

result in an error. Displays: PF%.

[HPth] — Horsepower (Theoretical)

Enters or calculates theoretical horse-

power (based on Amps, VA, watts, effi-

ciency%, PF%, and/or volts). 1.0 HPth

correlates to 746 watts at 100% effi-

ciency. Displays: HPth.

NOTE: This horsepower should not be

confused with the motor horsepower

keys used to determine motor load.

[Set] [HPth] — Efficiency

Enters or calculates the percent ratio

between real power (watts) and theo-

retical horsepower. Default: 100%. En-

tered or calculated efficiencies greater

than 100% will result in an error. Dis-

plays: EFF%.

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