ELECTRICALC PRO ® NEC® COMPLIANT UPDATEABLE ELECTRICAL CODE CALCULATOR Model 5065 User’s Guide
Introducing the ElectriCalc® Pro Now NEC®-Updateable! 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 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 . . . . . . . . . . . . . . . .
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.
Key Definitions 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. +-xÖ= Arithmetic operation keys. 0123456789¥ 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).
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 % — x2 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).
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. r1-9 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.
(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.
Electrical Functions K — kiloThis key is used with Watts, Amps, Volts, and Volt-amps keys to identify “kilo-” values. S K — milliThis 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.
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 Volts 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.
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.
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.
♦ 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.
(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.
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.
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.
♦ 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.
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.
♦ 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, nonDesign 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.
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.
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.
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.
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 entered or calculated, or an invalid conduit size is entered, the calculator will display “nonE.
(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 Type) ♦ First Press Displays the currently selected conduit type.
Preference Settings 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.
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. 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 by performing a Clear All (S x).
Basic Math Operations 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. B. C. D. 3 3 3 3 + x Ö 2 2 2 2 = = = = 5. 1. 6. 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. 355 250 25 100 x + Ö 15% 6¥5% 5% 50% 53.25 266.25 23.75 200.
Memory Operations Whenever the s 0 keys are pressed, the displayed value will be added to the Memory. Other Memory functions: FUNCTION KEYSTROKES Add to Memory Subtract from Memory Recall total in Memory Display/Clear Memory Clear Memory s S r r S 0 -s0 0 r r Memory is semi-permanent, clearing only when you: 1) 2) 3) 4) turn off the calculator; press r r; press S r; press S x (Clear All).
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).
Kirchhoff’s Law 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 0. Clear calculator o o Set to 1-phase S1 1 PH Enter VA 14605V VA 14,605. Enter Amps 1 1 5 A AMPS 115. Solve for Volts U VOLT 127.
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 Clear calculator Set to 1-phase Add VA loads: Enter as VA Enter Volts Solve for Amps Keystrokes Display oo 0. S1 1 PH 7800+ 15100+ 5100+ 8900+ 6 4 7 0 = 43,370. V VA 43,370. 2 4 0 U VOLT 240. A AMPS 180.
Finding Volt-Amps What is the VA rating for a 120 Volt, 22 Amp, 1Ø circuit? What is the kVA rating? Steps Clear calculator Set to 1-phase Enter Volts Enter Amps Solve Volt-amps Solve for kVA Keystrokes Display oo 0. S1 1 PH 1 2 0 U VOLT 120. 22A AMPS 22. V VA 2,640. KV KVA 2.64 Finding kVA Rating What is the kVA rating for a 120/208 Volt, three-phase, 65 Amp transformer? Steps Clear calculator Set to 3-phase Enter Volts Enter Amps Solve for kVA Keystrokes Display oo 0. S3 3 PH 2 0 8 U VOLT 208.
Finding kW Rating What’s the kW rating for a 90 Amp, 208 Volt, three-phase broiler with 100% power factor? Steps Clear calculator Set to 3-phase Set power factor Enter Amps Enter Volts Solve for kW Keystrokes Display oo 0. S3 3 PH 100SW PF%100. 90A AMPS 90. 2 0 8 U VOLT 208. KW KW 32.423991 Ohm’s Law 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.
Finding Volts The current in a circuit is 0.0125 Amps, and the total resistance is 480 Ohms. Find the Voltage. Steps Keystrokes Display 0. Clear calculator o o Enter current ¥0125SA Idc 0.0125 Enter resistance 4 8 0 S V OHMS 480. Find Voltage SU Vdc 6. Finding Amps An 120k electrical resistor is plugged into a 12 volt circuit. Find the current (in Amps). Steps Keystrokes Display 0. Clear calculator o o Enter resistance 1 2 0 K S V KOHM 120. Enter Voltage 1 2 S U Vdc 12. Find current SA Idc 0.
Motor Horsepower 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).
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 Clear calculator Set to 3-phase Enter Volts Enter HP Find load current Find 125% A size Keystrokes Display oo 0. S3 3 PH 2 3 0 U VOLT 230. 3h IND 3. HP A FLC 9.6 A Sw 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 Direct Current Motor Horsepower A direct current motor is defined as having a 10 Amp load on a 180 Volt circuit. What is its horsepower? Steps Clear calculator Set to DC motor Enter Volts Enter Amps Solve for HP Set to ind. motor Keystrokes Display oo 0. S8S8 DC 0. 1 8 0 U VOLT 180. 1 0 A AMPS 10. h DC 2. HP S8 IND 0.
Ampacity Wire Sizing 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.
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 Clear calculator Set to 3-phase Set to 75°C Enter Amps Find wire size Change to 90˚ Reset to 60˚ and Clear Keystrokes Display oo 0. S3 3 PH S7 3Ø 75 Cu 3 PH 260 A AMPS 260. w AWG 300 CU WIRE SIZE S9 AWG 0000 CU WIRE SIZE S 6 o 3Ø 60 Cu 0.
(Cont’d) Steps Enter Volts Find Amps Find wire size Change ambient temperature Find adjusted wire size Keystrokes Display 2 4 0 U VOLT 240. A AMPS 198.75 w AWG 000 CU WIRE SIZE 2 0 S 2 AMB° 20.˚C 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.
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 Clear calculator Set to 3-phase Set to 75°C Enter Amps Keystrokes Display oo 0. S3 3 PH S7 3Ø 75 Cu 3 PH 265A AMPS 265. w AWG 300 CU Find wire size 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.
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 Clear calculator Set to 60°C Set free air mode Enter Amps Find 1 wire size Keystrokes Display oo 0. S6 3Ø 60 Cu 0 S 5 3Ø 60 FrAir Cu 0. 5 0 0 A AMPS 500.
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 Clear calculator Set to 75°C Enter Amps Find normal wire size oo 0. S7 3Ø 75 Cu 0. 65A AMPS 65. Find derated wire size Display w AWG 6 CU WIRE SIZE 9SP D/R 3 CU Display Wire P Ampacity Display Adjustment P Factor Display NEC Table P WIRE SIZE D/R 45.5 WIRE A ADJ 70. % NEC 310.15 NOTE: See “Settings” for a list of Permanent Values/settings.
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 S6 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.
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.
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.
NOTE: See “Settings” for a list of Permanent Values/settings. Changing these settings may affect your calculations. 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 Clear calculator Set to 75°C Set to 3-phase Enter Amps Enter Volts Enter Length(feet) Find VD wire size Solve volt. drop Solve % v.
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 Clear calculator Set to 75°C Enter Amps Enter Volts Enter distance Enter allow. VD% Find wire size Keystrokes Display oo 0. S7 3Ø 75 Cu 0. 20A AMPS 20. 2 0 8 U VOLT 208. 1 7 5 l FEET 175. 3v DROP 3.0 V % w AWG 8 CU VD WIRE SIZE Find actual Voltage drop v DROP 4.7 V Find % v.
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 Clear calculator Set to 60°C Enter Amps Enter Volts Enter wire size* Enter 3% VD Find distance Find actual Voltage drop Find % v.drop Keystrokes Display oo 0. S6 3Ø 60 Cu 0. 15A AMPS 15. 2 4 0 U VOLT 240. 1 0 w AWG 10 Cu WIRE SIZE 3v DROP 3.0 V % l FEET 234.86987 v v DROP 7.2 V DROP 3.
Finding Voltage Drop Resistance What is the resistance of 85 Feet of #2 90°C copper conductor? Steps Clear calculator Set to 90°C Enter wire size* Keystrokes oo S9 2w Display 0. 3Ø 90 Cu 0. AWG 2 CU WIRE SIZE Find resistance S lOHMS 0.2033993 WIRE Find 85 ft resist** Ö 1 0 0 0 x 85= 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).
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.
Equipment Grounding Conductor Wire Size 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.
Fuse and Circuit Breaker Size 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 S3 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.
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 Clear calculator Set to 3-phase Enter Volts Enter Horsepower Enter nameplate current Keystrokes Display oo 0. S3 3 PH 4 6 0 U VOLT 460. 1 5 h IND 15. HP 19¥2A AMPS 19.2 Find overload size L AMPS 22.08 ol Display % used L %FLC 115.
Conduit Size 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.
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 Clear calculator Set to 1-phase Set to 60º C Enter Volts Enter Horsepower Enter cond. type Display full load Amps Find wire size Keystrokes Display oo 0. S1 1 PH S6 1Ø 60 Cu 1 PH 1 1 5 U VOLT 115. 1 0 h IND 10.
* 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 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 Clear calculator o o Enter cond. type 1 S C Enter wire size* 10w Enter conduit size 3 C Find max THHN # · Find max XHHW# Å Find max THW # Display 0. EMT nonE COND AWG 10 CU WIRE SIZE EMT 3.00 in COND SIZE THHN 167. TTL WIRES XHHW 145. TTL WIRES THW 145.
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 0. Clear calculator o o S7 3Ø Cu 75 0. Set to 75° Enter cond.
(Cont’d) Steps Keystrokes Find total # wires C Find conduit fill % C Find actual fill area C Find remaining area C Display 4. TTL WIRES FILL 36.1 COND % FILL 0.6711 TTL WIRE AREA 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.
What is the kw-hr rating for a 4,500 BTU heater? Steps Clear calculator Enter BTU Rating Find Equivalent Kilowatt Hours Keystrokes oo 4500 S= Display 0. 4,500. KW-H 1.3176 Parallel Resistance Find the equivalent resistane for 10 Ohm, 20 Ohm, and 50 Ohm resistors placed in parallel. Steps Clear calculator Enter 1st Resistor Enter 2nd Resistor Keystrokes Display oo 0. 1 0 S s P-RS 10. 20Ss P-RS 6.6666667 Enter 3rd Resistor 5 0 S s P-RS 5.
Error Codes 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 ENT Error POWR Error nonE Answer too large to display Invalid or out-of-scale entry PF or EFF calculated above 100% 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.
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. 2005 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.
Updating Future Code Revisions 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. Settings 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.
Repair and Return 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.
Warranty 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.
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.
Disclaimer CI MAKES NO WARRANTY OR REPRESENTATION, 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.
FCC Class B 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. Legal Notices 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.
Printed in China 04/06 UGL5065E-A
