Calculated Industries 5025 User Manual
ElectriCalc® LT
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 usi ng 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, especially 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, accurate, Code-legal answers.
National Electrical Code and NEC are
registered trademarks of the National
Fire Protection Association, Inc.,
Quincy, MA 02269
Introducing the
ElectriCalc®LT
The
calculator for today’s busy electrical
professional. Unlik e a regular calc ulator,
it has intuitively labeled “electrical keys”
and conforms to the 1999
Electrical Code,
Code-related problems quickly and
accurately. Common NEC tables are
built in, providing instant solutions for
the following:
♦
♦
♦
ElectriCalc®LT
Volts, Amps, Volt-Amps, Watts,
kVA, kW, PF%, EFF%, and DC
Resistance
Copper or Aluminum Wire Sizes
Parallel & Derated Wire Sizes
is an invaluable
National
allowing you to solve
♦
Voltage Drop Wire Sizes, % and
Actual Voltage Drops, Voltage
Drop Distances and Wire Resis-
tances
♦
Grounding Conductors Sizes
♦
And much more!
User's Guide — 1
Table of Cont ents
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Key Definitions
Default Settings
Basic Math Operations
Percent Calculations
Memory Functions
Kerchoff’s Law
Ampacity Wire Sizing
Voltage Drop
Error Codes
1999 NEC References
Battery Informa ti o n
Settings
3
16
17
17
18
19
24
31
39
39
40
40
Warranty
Legal Notices
2 — ElectriCalc LT
41
45
Key Definiti ons
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 mem ory
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.
User's Guide — 3
[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 negative to positive).
[Set] [÷] — Reciprocal (1/x)
Reciprocal, or 1/x function.
[0] – [9] & [ • ]
Digits used for keying in numbers.
[Set] [ . ] — x
2
Squares the displayed value.
[%] — Percent
Four function percent key.
[Set] [%] — Square Root (
x )
Square root function.
4 — ElectriCalc LT
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
the material type without changing the
size.
Displays: Al
or
[CU/AL]
Cu
will change
[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.
[Set] [7] — 75°C Wire Insulation
Sets calculator to 75°C insulation type
for wire size calculations.
Displays: 60.
Displays: 75.
User's Guide — 5
[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 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°.
[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 powered down. Displays: FrAir.
[Set] [+] — °C/°F Toggle
Toggles ambient temperature format
between °C and °F. Converts displayed
temperature value automatically.
Displays: °C or °F.
6 — ElectriCalc LT
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).
KAMP.
[Volts] — Volts
Enters or calculates volts (using amps,
HPth, and VA or watts). Default value is
240 volts.
Displays: VOLT, KV, or mV.
Displays: AMPS,
[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.
User's Guide — 7
[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%.
[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.
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 theoretical horsepower. Default: 100%. Entered or calculated efficiencies greater
than 100% will result in an error. Dis-
plays: EFF%.
8 — ElectriCalc LT
Ampacity Tables
The
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 LT
uses NEC Table
ElectriCalc LT.
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.
♦
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 amp acity.
♦
Third Press
If a wire length has been entered, displays the minimum wire ampacity rating.
[Set] [WireSz] — 125% Ampacity
Operates same as [W ireS z], except that
a factor of 125% is applied to the amperage.
[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” as the NEC does not
allow parallel wire runs smaller than 1/0.
NOTE
: No adjustments are made for
deration
♦
.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
10 — ElectriCalc LT
Displays the maximum adjusted ampacity of the calculated parallel wire
size. Displays: WIRE A.
NOTE:
Some areas may not allow paralleling conductors. Users must know
the jurisdiction requirements for their
area.
[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.
♦
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 %
User's Guide — 11
Voltage Drop Solutions
The
mum 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
ElectriCalc LT
: Voltage drop solutions may vary
will calculate maxi-
slightly from actual AC circuit val ues as
factors such as inductive reactance,
skin effect, raceway material, etc., are
not considered
[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 avai lable, “nonE” will display since the voltage drop cannot be found.
♦
First Press
Enters a maximum allowable voltage
drop percentage
or calculates actual voltage drop
%)
Displays: V DROP
♦
Second Press
Calculates actual percent voltage drop.
Displays: V DROP %
(Displays: V DROP
12 — ElectriCalc LT
[Length] — Length
Enters or calculates the maximum
length of run for voltage drop computation. Displays: FEET or MET
[Set] [Length] — Wire Resistance
Displays the wire resistance per 1,000
feet of the wire size in [WireSz] based
on NEC Chapter 9, Table 8.
Displays: OHMS WIR E
User's Guide — 13
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