ELECTRICALC PRO ® NEC® COMPLIANT UPDATEABLE ELECTRICAL CODE CALCULATOR Model 5060 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 2005 NEC® and future Codes, not replace it. Users, especially those unfamiliar with the Code, should exercise appropriate caution.
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 future National Electrical Codes, allowing you to solve Code-related problems quickly and accurately.
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 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! 2 — ElectriCa
Table of Contents Installing NEC Updates . . . . . . . . . . . . . .4 Key Definitions . . . . . . . . . . . . . . . . . . . .5 Preference Settings . . . . . . . . . . . . . . . .25 Default Settings . . . . . . . . . . . . . . . . . .26 Basic Math Operations . . . . . . . . . . . . . .27 Percent Calculations . . . . . . . . . . . . . . .27 Memory Functions . . . . . . . . . . . . . . . .28 New 2005 Functions . . . . . . . . . . . . . . .29 Kerchoff’s Law . . . . . . . . . . . . . . . . . . .
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 2008). 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 1800-854-8075). This Update is in the form of a chip that contains the new Code.
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. +–x÷= Arithmetic operation keys. 0123456789• Used for keying in numbers. % — Percent Four function percent key. B Back Space Function Used to delete entries one keystroke at a time (unlike the On/C function, which deletes the entire entry).
r — Recall Recalls a value stored in a register (e.g., to recall voltage drop % press r v ). Displays: RCL. S + — Pi (π) Constant = 3.141593 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 Adds displayed value to Memory (e.g., 10 s 0, 20 s 0, r 0 = 30).
S r — Clear Memory Clears the value saved in (M+) without changing displayed value. 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 ÷ — Preferences Use to set default settings or modes (see “Preference Settings” page 26). S 1 — Single-Phase (1Ø) Sets calculator to single-phase mode. Displays: 1Ø. S 3 — Three-Phase (3Ø) Sets calculator to three-phase mode. Displays: 3Ø.
NOTE: The temperature units can be displayed in Celsius (°C) or Fahrenheit (°F) by using the preference function S ÷. S 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 S 4 will change the material type without changing the size. Displays: Al or Cu.
S 9 — 90°C Wire Insulation Sets calculator to 90°C insulation type for wire size calculations. Displays: 90. 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).
V — Volt-Amps Enters or calculates volt-amps (using amps, volts and horsepower or watts). Displays: VA KVA, or mVA. W — Watts Enters or calculates watts (using amps, volts, and VA or horsepower). Displays: WATT KW, or mW. S W —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%.
S = (Btu Kw-hr ) — BTU to Kilowatt Hours function. Calculate Kilowatt Hours based on an entered BTU (British Thermal Unit) value. S s (Par Res ) — Parallel Resistance function. Calculate total resistance based on an entered series of resistance values. 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.
h — 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.
♦ 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. S w — 125% Ampacity Used for motor wire sizing when the wire must not exceed 80% of its rated ampacity (125%A). This keystroke calculates wire size based on 125% of the entered or calculated amps value. Displays: 125%.
♦ 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 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.
l — 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 S ÷. S l — Wire Resistance Displays the actual resistance per 1,000 feet of the wire size in w based on NEC Chapter 9, Table 8. Displays: OHMS WIRE.
♦ 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. 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 (i.e., 300 S G).
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 430-152.
♦ 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 L will select and display the next motor type from this list: SQ-C non-E (Squirrel Cage, nonDesign E), SQ-C E (Squirrel Cage, Design E), 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 value used to determine fuse size. Subsequent presses repeat this cycle. Displays: %FLC. S I — 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.
L — Overload Protection ♦ First Press Displays the overload amperage requirement based on the full-load current shown on the motor nameplate. Multiplies the entered motor nameplate full-load current (stored in the [Amps] registers) by 115% or the value you enter. Conforms to NEC Section 43032 (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.
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.
♦ Third Press Shows total cross-sectional area of all entered wires of the selected wire insulation. Displays: TTL WIRE AREA. 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.
♦ 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. S C— Conduit 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 ÷. 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.
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. Default Settings When you first receive your calculator, it is pre-set to the default settings listed below.
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. B. C. D. 3 3 3 3 + – x ÷ 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 x 15 250 + 6•5 25 –5 1 0 0 ÷ 50 % % % % 53.25 266.25 23.75 200.
Memory Functions Whenever the s 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 s0 ®r0 Display total in Memory Display & clear Memory ® r r Clear Memory, no display Sr Replace Memory with displayed value Srs0 The Memory is semi-permanent; it will be cleared when you: 1) 2) 3) 4) turn off the calculator; press r r; press S r; press S x (Clear All).
New 2005 Functions The default NEC setting is now 2005. This will be displayed after performing a Clear All S x. The NEC Preference Settings (see preference settings on page 26) will now include 1996, 1999, 2002, and 2005. NEC Wire Table Identification The ElectriCalc Pro now displays the NEC Table referenced when performing Wire Size calculations. This feature works with the following functions: Wire Size w, Ground Wire G, Equipment Ground Wire S Gg and Derated Wire Size S P.
Find the equivalent BTU rating of a 3.5 kw-hr rated furnace. Steps Keystrokes Enter Kilowatt Hours Find Equivalent BTU 3•5®® S• Display 3.5 BTU 11,953.552 Btu Kw-hr – BTU to Kilowatt Hours function. New function that allows you to calculate Kilowatt Hours rating based on an entered BTU (British Thermal Unit) value. This function is accessed by pressing S =. What is the kw-hr rating of a 4,500 BTU heater? Steps Keystrokes Enter BTU Rating Find Equivalent Kilowatt Hours 4500® ® 4,500.
Find the equivalent resistance for 10 ohm, 20 ohm, and 30 ohm resistors placed in parallel. Steps Keystrokes Enter 1st Resistor Enter 2nd Resistor Enter 3rd Resistor 10Ss 20Ss 30Ss Display P-Rt 10.00 P-Rt 6.67 P-Rt 5.88 Note: The total is recalculated with each additional resistor value entered. Kerchoff’s Law The ElectriCalc Pro utilizes Kerchoff’s Law in finding volts, amps, volt-amps, watts, horsepower (theoretical), efficiency and power factor.
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 Set to 3-phase Enter VA Enter volts Solve for amps oo 0. S3 3 PH 8250V VA 8,250. 240U VOLT 240. Aa AMPS 19.
Enter as VA Enter volts Solve for amps 6470 = 43,370. V VA 43,370. 240 U VOLT 240. A AMPS 180.70833 Finding Amps from Kilowatts What is the amperage for a 75 kW load connected in a 120/208 volt, 3Ø circuit? Steps Keystrokes Display Clear calculator Set to 3-phase Enter kilowatts Enter volts Solve for amps oo 0. S3 3 PH 75 K W KW 75. 208 U VOLT 208. A AMPS 208.
Finding kVA Rating What is the kVA rating for a 120/208 volt, three-phase 65 amp transformer? Steps Keystrokes Display Clear calculator Enter volts Enter amps Solve for kVA oo 0. 208 U VOLT 208. 65 A AMPS 65. K V KVA 23.417327 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 Set to 1-phase Enter volts Set power factor Enter amps Solve for watts Set to 3 phase oo 0. S1 1 PH 120 U VOLT 120.
Steps Keystrokes Display Clear calculator Set to 3-phase Set power factor Enter amps Enter volts Solve for kW oo 0. S3 3 PH 100SW PF%100. 90 A AMPS 90. 208 U VOLT 208. KW KW 32.423991 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.
Finding Single-Phase Full Load Current A 2 HP induction motor operates on 230 volt, single-phase power. What is the full load current for this motor? Steps Keystrokes Display Clear calculator Set to 1-phase Enter volts Enter HP Find full load amps Set to 3 phase oo 0. S1 1 PH 230 U VOLT 230. 2h IND 2. HP A FLC 12. A S3 3 PH 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 oo 0.
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 Clear calculator Set to synch. Enter volts Enter amps Solve for HP oo 0. S8 SYNC 0. 240 U VOLT 240. 27 A AMPS 27. h SYNC 25. HP Ampacity Wire Sizing The required wire size of a service conductor can be determined based on the specified electrical requirements and the w key.
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 Set to 1-phase Enter kVA Enter volts Find amps Find wire size oo 0. S1 1 PH 30 K V KVA 30. 240 U VOLT 240. A AMPS 125. w AWG 0 CU WIRE SIZE Display Wire Ampacity w 0 125.0 Cu WIRE A NEC 310.
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 Clear calculator Set to 75°C Enter amps Find wire size oo 0. S7 3Ø 75 Cu 0. 260 A AMPS 260. w AWG 300 CU WIRE SIZE S9 AWG 0000 CU WIRE SIZE S6o 0.
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 Clear calculator Set to 1-phase Set to 90°C Set to Al Enter VA Enter volts Find amps Find wire size oo 0. S1 1 PH S9 1 Ø 90 Cu 1 PH S4 1 Ø 90 Al 1 PH 47700V VA 47,700. 240 U VOLT 240. A AMPS 198.
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 oo 0. S7 3Ø 75 Cu 0. 265 A AMPS 265. w AWG 300 CU WIRE SIZE AWG 400 AL Change to alum. S 4 WIRE SIZE w 400 270.0 Display Wire Ampacity AI WIRE A Display NEC Table w NEC 310.16 Clear calculator Set to 75°C Enter amps Find wire size * NOTE: See “Settings” for a list of Permanent Values/settings.
Sizing Parallel Conductors What size 60°C insulated copper wire is required for a single conductor carrying a 500 amp load in a Free Air environment (30°C amb. temp.)? What size for 2 parallel conductors? For 3 conductors? Steps Keystrokes Clear calculator Set free air mode Enter amps Find 1 wire size oo 0. S 5 3Ø 60 FrAir Cu 0. 500 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 S7 65 A Find derated wire size Display 0. 3Ø 75 Cu 0. AMPS 65. w AWG 6 CU WIRE SIZE 9SP D/R 3 CU P Display Wire Ampacity Display Adjustment P Factor Display NEC Table P WIRE SIZE D/R 45.5 Cu WIRE A ADJ 70. % Cu % NEC 310.
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 Clear calculator o o 0. Set to 1-phase S1 1 PH Set to 90°C S9 1Ø 90 Cu 1 PH Toggle to alum. S 4 1Ø 90 Al 1 PH Enter volt-amps 47650V VA 47,650. Enter volts 240 U VOLT 240.
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 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.
* 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 Keystrokes Clear calculator Set to 75°C Enter amps Enter volts Enter length(feet) Find VD wire size oo 0. S7 3Ø 75 Cu 0. 20A AMPS 20.
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 required for this branch circuit? Steps Keystrokes Clear calculator Set to 75°C Set to 1-phase Enter amps Enter volts Enter distance Enter allow. VD% Find wire size oo 0. S7 3Ø 75 Cu 0. S1 1 PH 20 A AMPS 20. 208 U VOLT 208. 175 l FEET 175. 3v DROP 3.0 V % w AWG 8 CU VD WIRE SIZE Find actual voltage drop Find % v.
Finding Voltage Drop Distance How far from a single-phase 240-volt source can you install a 15 amp load using 60°C #10 aluminum branch circuit conductors? Assume a 3% allowable voltage drop. Steps Keystrokes Clear calculator Set to 1-phase Set to aluminum Enter amps Enter volts Enter wire size oo 0. S1 1 PH S4 1Ø 60 Al 1 PH 15 A AMPS 15. 240 U VOLT 240. 10 w AWG 10 AL WIRE SIZE 3v DROP 3.0 V % l FEET 123.77387 Enter 3% VD Find distance Find actual voltage drop Find % v.drop v v Display DROP 7.
Finding Voltage Drop Resistance What is the resistance of 85 feet of #2 90°C copper conductor? Steps Keystrokes Clear calculator Set to 90°C Enter wire size oo S9 2w Find resistance Find 85 ft resist* Display 0. 3Ø 90 Cu 0. AWG 2 CU WIRE SIZE S l OHMS 0.2033993 WIRE ÷ 1000 x 85 = 0.0172889 *NOTE: Given resistance per 1000 feet, divide by 1000 to get a per foot resistance, then multiply by 85. * NOTE: See “Settings” for a list of Permanent Values/settings.
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.
Equip. 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 require-ments? Steps Keystrokes Display Clear calculator Enter volts Enter HP Find full current Find DE fuse size Display % used Find SE fuse size Display % used Find inv. time brkr Display % used Find ins. trip breaker sz. Display % used oo 0. 230 U VOLT 230. 50 h IND 50. HP A FLC 130. A D AMPS 227.
Overload Protection Size What overload protection device size is required for a 460 volt, 3-phase, 15 HP induction motor with a nameplate cur-rent rating of 19.2 amps and a 1.0 ser-vice factor? What is the required overload rating at 125% (for a 1.15 service factor)? Steps Keystrokes Clear calculator Enter volts Enter horsepower Enter nameplate current Find overload size Display % used Find 125% load Display % used oo 460 U 15 h Display 0. VOLT 460. IND 15. HP 19•2 A AMPS 19.2 L AMPS 22.
To select a specific conduit type, enter the corresponding number of the conduit and then press S C. The numbers and types are: 1) EMT 5) LFNB 9) P-80 2) ENT 6) LFNA 10) P-40 3) FMC 7) LFMC 11) P-A 4) IMC 8) RMC 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).
Find conduit size C Find total # wires C Find conduit fill % C Find act. fill area C Find rem. area C RMC 1.25 in COND SIZE 2. TTL WIRES FILL 24.3 COND % FILL 0.3710 TTL WIRE AREA REM 0.1021 WIRE AREA NOTE: 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.
Enter wire size 6w Enter # THHN 11 t Find conduit size C AWG 6 CU WIRE SIZE THHN 11. WIRES IMC 1.25 in COND SIZE 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 Clear calculator Enter cond. type oo 1SC Enter wire size 10w Enter conduit size 3 C Find max THHN # t Find max XHHW# X Find max THW # T Display 0.
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 crosssectional area of wires, conduit size and actual fill area? (Use [THHN] for THWN; the cross-sectional areas are the same.) Steps Keystrokes Clear calculator Set to 75° Enter cond. type oo 0. S7 1Ø Cu 75 0. 3SC FMC nonE COND 0w AWG 0 CU WIRE SIZE 3t THHN 3.
Find conduit fill % C Find actual fill area C Find remaining area C TTL WIRES FILL 36.1 COND % FILL 0.6711 TTL WIRE AREA REM 0.0717 WIRE AREA * NOTE: See “Settings” for a list of Permanent Values/settings. Changing these settings may affect your calculations.
Battery Information The calculator is powered by a single 3Volt 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 disposing of your old batteries as they contain hazardous chemicals. Battery Replacement Instructions: 1) Hold calculator upright with back of calculator toward you. 2) Lift battery holder out from the top of the 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 430.148 Table 430.150 Table 430.152 Appendix C Updating Future Code Revisions This model is updateable for future NEC Editions. For information on 2008 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.
Warranty, Repair and Return Information Return Guidelines 1. Please read the Warranty in this User's Guide to determine if your Calculated Industries calculator, measuring device or electronic tool remains under warranty before calling or returning any device for evaluation or repairs. 2. If your calculator won't turn on, try pressing the Reset button first. If it still won't turn on, check the batteries as outlined in the User's Guide. 3.
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.
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 Construction Master Technologies, LLC, 2005. User’s Guide copyrighted by Calculated Industries, Inc., 2005. ElectriCalc® and Calculated Industries® are registered trademarks of Calculated Industries, Inc. 4840 Hytech Drive Carson City, NV 89706 U.S.A.
Looking For New Ideas Calculated Industries, a leading manufacturer of special-function calculators and digital measuring instruments, is always looking for new product ideas in these areas. If you have an idea, or a suggestion for improving this product or User’s Guide, please submit your comments online at: www.calculated.com under “Contact Us,” “Product Idea.” Thank you.
Printed in China 5060UGL-E-C 1/05
