Calculated Industries ElectriCalc LT User Manual
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Calculated Industries ElectriCalc LT User Manual

Calculated industries electricalc lt: users guide
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ElectriCalc
LT
An Electrician's Utility for Wiring
User's Guide

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Summary of Contents for Calculated Industries ElectriCalc LT

  • Page 1 ® ElectriCalc An Electrician's Utility for Wiring User's Guide...
  • Page 2 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.
  • Page 3 Introducing the ElectriCalc ® The ElectriCalc LT 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 accurately.

  • Page 4: Table Of Contents

    Percent Calculations... 17 Memory Functions ... 18 Kerchoff’s Law... 19 Ampacity Wire Sizing... 24 Voltage Drop ... 31 Error Codes... 39 1999 NEC References... 39 Battery Information ... 40 Settings ... 40 Warranty... 41 Legal Notices ... 45 2 — ElectriCalc LT...

  • Page 5: Key Definitions

    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.
  • Page 6 [0] – [9] & [ • ] Digits used for keying in numbers. [Set] [ . ] — x Squares the displayed value. [%] — Percent Four function percent key. [Set] [%] — Square Root ( x ) Square root function. 4 — ElectriCalc LT...
  • Page 7 [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...
  • Page 8 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. 6 — ElectriCalc LT...
  • Page 9 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).
  • Page 10 [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%. 8 — ElectriCalc LT...
  • Page 11 Ampacity Tables The ElectriCalc LT 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 tem- perature rating (60°C, 75°C and 90°C), 2) wire material (copper or aluminum), and 3) ambient temperature.
  • Page 12 1/0. NOTE: No adjustments are made for deration .First Press When preceded by a number, calcu- lates the applicable wire size for that quantity of wires in parallel. Displays: PAR WIRE SIZE. Second Press 10 — ElectriCalc LT...
  • Page 13 Displays the maximum adjusted am- pacity of the calculated parallel wire size. Displays: WIRE A. NOTE: Some areas may not allow par- alleling 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).
  • Page 14 Voltage Drop Solutions The ElectriCalc LT will calculate maxi- 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.
  • Page 15 [Length] — Length Enters or calculates the maximum length of run for voltage drop computa- tion. 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 WIRE User's Guide —...
  • Page 16 Displays: GRND CU WIRE SIZE Second Press Displays the aluminum grounding elec- trode conductor size. Displays: GRND AL WIRE SIZE Third Press Displays the circular mil area used to calculate the grounding electrode con- ductor size. Displays: CMIL WIRE 14 — ElectriCalc LT (largest...
  • Page 17 4001 or more. The AL conductor sizes given in the Table (1200 MCM AL) are not among those listed in Table 310- 16/17, which is the table the calculator uses to calculate wire size. In these cases, the calculator gives a slightly larger 1250 MCM AL as the appropriate Equipment Ground wire size.

  • Page 18: Default Settings

    All-Clear ([Set] [x]). Ambient Temperature Insulation Rating Material Phase Volts Efficiency Power Factor Length Units Voltage Drop Percent Wire Environment (vs Free Air) 16 — ElectriCalc LT 30°C 60°C Copper (Cu) 3Ø 240 V 100% 100% Feet Raceway...

  • Page 19: Basic Math Operations

    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 (=). [–] [÷] Percent Calculations The percent key [%] can be used for...

  • Page 20: Memory Functions

    355 [M+] Add to M+ 255 [M+] Recall total M+ [Rcl] [M+] Sub. from M+ 745 [Set] [M+] Recall & clear [Rcl] [Rcl] 18 — ElectriCalc LT [Set] [M+] [Rcl] [M+] [Rcl] [Rcl] [Set] [Rcl] [Set] [Rcl] [M+] Display 355.

  • Page 21: Kerchoff's Law

    Kerchoff’s Law The ElectriCalc LT utilizes Kerchoff’s Law in finding volts, amps, volt-amps, watts, horsepower (theoretical), effi- ciency and power factor. Finding Voltage Find the voltage supply to a single- phase load drawing 14,605 volt-amps and 115 amps. Steps Keystrokes...

  • Page 22: Finding Current Load

    [Set] 1 Add VA loads: 7,800 + 15,100 + 5,100 + 8,900 + 6,470 [=] Enter as VA [VA] Enter volts 240 [Volts] Solve for amps [Amps] 20 — ElectriCalc LT Display 1 PH 43,370 43,370. VA 240. VOLT 180.70833 AMPS...

  • Page 23: Finding Amps From Kilowatts

    Finding Amps from Kilowatts What is the amperage for a 75 kW load connected in a 120/208 volt, 3Ø circuit? Steps Keystrokes Clear calculator [On/C] [On/C] Set to 3-phase [Set] 3 Enter kilowatts 75 [kilo-] [Watts] Enter volts 208 [Volts]...

  • Page 24: Finding Kva Rating

    Set to 1-phase [Set] 1 Enter volts 120 [Volts] Set power fact % 87 [Set] [Watts] Enter amps 45 [Amps] Solve for watts [Watts] 22 — ElectriCalc LT Display 208. VOLT 65. AMPS Display 1 PH 120. VOLT 87 PF% 45. AMPS...

  • Page 25: Finding Kw Rating

    Finding kW Rating What’s the kW rating for a 90 amp, 208 volt, three-phase broiler with 100% power factor? Steps Keystrokes Clear calculator [On/C] [On/C] Set to 3-phase [Set] 3 Set power factor 100 [Set] [Watts] 100 PF% Enter amps...

  • Page 26: Ampacity Wire Sizing

    [Set] 6 Enter kVA 30 [kilo-] [VA] Enter volts 240 [Volts] Find amps [Amps] Find CU wire size [WireSz] 24 — ElectriCalc LT Display 1 PH 1Ø 60 Cu 1 PH 30. KVA 240. VOLT 125. AMPS 0 CU AWG WIRE SIZE...

  • Page 27: 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 Reset calculator [Set] [x] Set to 75°C [Set] 7 Enter amps 260 [Amps] Find wire size [WireSz] Û...

  • Page 28: Wire Sizing Based On Ambient Temperature

    NOTE: Ambient temperature will remain at 40°C unless you change it or perform an ALL CLEAR ([Set] [x]). Reset amb. temp 30 [Set] [2] 26 — ElectriCalc LT Display 1 PH 1 Ø 90 Cu 1 PH 1 Ø 90 Al 1 PH 47,700.

  • Page 29: 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 Reset calculator [Set] [x] Set to 75°C [Set] 7 Enter amps 265 [Amps] Find wire size [WireSz] Change to alum.

  • Page 30: Sizing Parallel Conductors

    Find 2 wire size 2 [ParSz] Find 3 wire size 3 [ParSz] NOTE: Parallel wire sizes smaller than 1/0 will be displayed as nonE. 28 — ElectriCalc LT Display 500. AMPS 500 CU AWG WIRE SIZE 000 CU PAR WIRE SIZE...

  • Page 31: Finding Derated Wire Size

    Finding Derated Wire Size What is the derated wire size required for nine 75°C copper wires, each carry- ing a maximum load of 65 amps? Steps Keystrokes Reset calculator [Set] [x] Set to 75°C [Set] 7 Enter amps 65 [Amps] Find normal...

  • Page 32: Sizing Temperature-Adjusted Derated Wires

    30°C to avoid conflicts in answers through out the rest of this manual. Reset to 30°C 30 [Set] [2] 30 — ElectriCalc LT Display 1 PH 1Ø 90 Cu 1 PH 1Ø 90 Al 1 PH 47,650. VA 240.

  • Page 33: Voltage Drop

    ([Length]) once you have entered or calculated the phase, volts, amps, wire type, voltage drop wire size, and allow- able VD percentage. The ElectriCalc LT uses resistance values found in NEC Table 8 to determine voltage drop. NOTE: Voltage drop solutions may vary...
  • Page 34 IMPORTANT NOTE ON VOLTAGE DROP CALCULATIONS The ElectriCalc LT calculates voltage drop and wire size using DC resistance values as defined by the 1999 NEC. To find the voltage drop for a specific wire size, you must first enter amps (and the other required variables), then enter the specific wire size.

  • Page 35: Finding Three-Phase Voltage Drop

    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 Reset calculator [Set] [x] Set to 75°C [Set] 7 Enter amps 20 [Amps] Enter volts 230 [Volts]...

  • Page 36: Finding Voltage Drop Wire Size

    Enter allow. VD% 3 [VD%] Find wire size [WireSz] Find actual voltage drop [VD%] Find % v.drop [VD%] 34 — ElectriCalc LT Display 3Ø 75 Cu 0. 1 PH 20. AMPS 208. VOLT 175. FEET 3 DROP V % 8 CU AWG WIRE SIZE 5.4 DROP V...

  • Page 37: Finding Voltage Drop Distance

    15 amp load using 60°C #10 Al branch circuit con- ductors? Assume a 3% allowable volt- age drop. Steps Keystrokes Reset calculator [Set] [x] Set to single ph. [Set] 1 Set to aluminum [CU/AL] Enter amps 15 [Amps] Enter volts...

  • Page 38: Finding Voltage Drop Resistance

    Steps Keystrokes Reset calculator [Set] [x] Enter voltage 12 [Volts] Enter amps 5 [Amps] Find resistance [Set] [Volts] 36 — ElectriCalc LT Display 3Ø 90 Cu 0. 2 CU AWG WIRE SIZE 0.2033993 OHMS WIRE Display 12 VOLT 5. AMPS...

  • Page 39: Ground Conductor Wire Size

    You can use single or multiple service entrance conductor(s) grounding electrode conductor for AC systems. When using multiple conduc- tors, the ElectriCalc LT 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 larg- est 3-phase 75°C copper service-...

  • Page 40: Equipment Grounding Conductor Wire Size

    [Set] 9 Enter amp rating 45 [Amps] Find equip. grnd. wire size [Set] [Grnd] EQPG WIRE SIZE Find alum size [Grnd] EQPG WIRE SIZE 38 — ElectriCalc LT Table Display 3Ø 90 Cu 0. 45. AMPS 10 CU 8 AL...

  • Page 41: Error Codes

    Error Codes The error codes for the ElectriCalc LT are listed below (Note: To clear an error, simply press any key): Error Description Display register overflow (Answer too large to fit display) Invalid or out-of-scale entry PF or EFF calculated above 100%...

  • Page 42: Battery Information

    The following are permanent val- ues: (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 % 40 — ElectriCalc LT...

  • Page 43: Warranty

    (2) Free Air mode Warranty Warranty Repair Service – U.S.A. Calculated Industries, Inc. ("CII") war- rants 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...
  • Page 44 Contact the CII Authorized Service Pro- vider listed on the back page of the User’s Guide to obtain current product 42 — ElectriCalc LT...
  • Page 45 repair information and charges. Repairs are guaranteed for 90 days. Repair Service – Outside the U.S.A. Not all countries have CII 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 pur- chased the product.

  • Page 46: Fcc Class B

    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. 44 — ElectriCalc LT...

  • Page 47: Legal Notices

    Software copyrighted and licensed to Calculated Industries, Inc. by Specialty Calculator Technologies, LLC, 1999. User’s Guide is copyrighted by Calcu- lated Industries, Inc., 1999. ElectriCalc LT and Calculated Industries are registered trademarks of Calculated Industries, Inc. ALL RIGHTS RESERVED Calculated Industries, Inc.
  • Page 48 Designed in the United States of America Printed in Indonesia 5025-MN V1.0...

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