electrician calculators

Electrician Calculators
the premiere site for online electrical calculators
from the National Electrical Resource Center


 

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Download Code Calculators


 

 

Code Calculators has been REVISED with Visual Basic 2010.  The installation bugs should be fixed.

Code Calculators includes a raceway fill program, a Voltage Drop program, a Table 310.16 program, 3-phase Voltage Drop program using NEC Table 9, and basic Power, Watts, Amperes calculation programs.  This is a Visual Basic 2010  ClickOnce application that downloads and installs on your computer that includes a desktop icon.  It can be removed using the windows control panel.

This program will check for required  components and download and install missing components.  It has been tested on Windows 7 , Vista, and XP.  Note, the .NET Framework 4 client file is quite large (41 MB)

The following prerequisites are required and if not found will be automatically installed:
 
  • Windows Installer 3.1
  • Microsoft Visual Basic PowerPacks 10.0
  • Microsoft .NET Framework 4 Client Profile (x86 and x64)  (41 MB)

Click here to see pictures of Code Calculators

 

 

The below Calculators are written in JavaScript.

They run in a web page using Java enabled Browsers.

3-Phase Voltage Drop Calculator with Power Factor NEW  This JavaScript calculator runs in a web page. It uses Table 9 and Table 8 data to calculate 8 different voltage drops for comparison.  For 3-phase, 3 wire in PVC, Aluminum, and Steel conduit.
Compact Conductor
 Raceway Fill
This webpage calculator is still online but a more complete raceway and trough fill application is included in the Code Calculator suite.

Select the wire insulation, wire size, number of conductors, type of raceway, fill type either 25 per cent, 60 per cent or auto and this program finds the correct raceway size.  When only three conductors of the same size are selected the jamming ratio is calculated and the user is alerted if the jamming ratio is between 2.8 and 3.2 and the user is given the choice of upsizing the raceway per Chapter 9 Table 1 FPN 2.   Five unique compact conductor sizes can be entered.

Range Calculator NEW  Select range ratings from 1 3/4 KW to 27 KW  and number of ranges and this program determines the demand load using Table 220.55 and Notes 1, 2 , and 3.  Loads for up to 1000 ranges can be determined.   Twelve examples from the NEC, textbooks, and the author are included.
Table 310.16 Conductor Size This webpage calculator is still online but a better NEC Table 310.16 application is included in the Code Calculator suite.

Enter the continuous and noncontinuous load then select the conductor insulation, terminal temperature, ambient temperature, number of current carrying conductors and this program finds the correct wire size and maximum and minimum over current protective devices and the respective size of the equipment grounding conductors.  Also includes special condition buttons for nipples, AC/MC cable, equipment rated for continuous loads, and circuit is for receptacles for cord and plug connected equipment.  Conductor size is automatically adjusted to the conditions according to the NEC.  Results are automatically entered into a voltage drop calculator that calculates voltage drop with an option to increase wire size and proportionately increase the equipment grounding conductor size.  Examples and notes on how programs operates are included. 

Table 310.16 Load Select the wire size, conductor insulation, terminal temperature, ambient temperature, number of current carrying conductors and this program finds the permitted load and maximum and minimum over current protective devices and the respective size of the equipment grounding conductors.  Also includes special condition buttons for nipples, AC/MC cable, and circuit is for receptacles for cord and plug connected equipment.  The permitted load is automatically adjusted to the conditions according to the NEC.  Results are automatically entered into a voltage drop calculator that calculates voltage drop with an option to increase wire size and proportionately increase the equipment grounding conductor size.  Notes on how programs operates are included. 
Table 310.16 Parallel Select the wire size starting at 1/0 AWG, number of conductors in parallel, conductor insulation, terminal temperature, ambient temperature, number of current carrying conductors and this program finds the permitted load and maximum over current protective devices and the size of the equipment grounding conductors.  Also includes special condition button for nipples.  The permitted load is automatically adjusted to the conditions according to the NEC.  Results are automatically entered into a voltage drop calculator that calculates voltage drop with an option to increase wire size and proportionately increase the equipment grounding conductor size.  Notes and example on how programs operates are included. 
Motor Branch Circuit Select motor hp from 1/6 to 450 hp, phase, type of motor, class of service, duty cycle, conductor material type, ambient temperature, number of current carrying conductors in raceway or cable, conductor insulation type, terminal temperature, service factor, and temperature rise.  This program then determines motor branch circuit parameters that include wire size, short-circuit and ground-fault protective device normal and maximum values for all four types, conductor size, overload protection size, disconnect size, controller NEMA size, and equipment grounding conductor size when the motor nameplate full load amperes value is entered.  Required results are automatically entered into a voltage drop calculator at bottom of page where voltage drop can be calculated that permits increasing the conductor size to lower voltage drop.
Raceway Fill

(not for compact conductors)

This webpage calculator is still online but the raceway and trough fill application shown above is much more complete.

Select the wire insulation, wire size, number of conductors, type of raceway, fill type either 25 per cent, 60 per cent or auto and this program finds the correct raceway size.  When only three conductors of the same size are selected the jamming ratio is calculated and the user is alerted if the jamming ratio is between 2.8 and 3.2 and the user is given the choice of upsizing the raceway per Chapter 9 Table 1 FPN 2.   Five unique conductors can be entered.

Extended Raceway Fill This is the same as the raceway fill calculator except the number of unique conductors is entered and a calculator for any number of conductors is custom built in the lower frame.  Then select the wire insulation, wire size, number of conductors, type of raceway, fill type either 25 per cent, 60 per cent or auto and this program finds the correct raceway size.  When only three conductors of the same size are selected the jamming ratio is calculated and the user is alerted if the jamming ratio is between 2.8 and 3.2 and the user is given the choice of upsizing the raceway per Chapter 9 Table 1 FPN No. 2.   Any number of unique conductors can be entered.
Cable Raceway fill Enter the number of unique cables and a calculator for the cables is custom built in the lower frame.  Then enter the diameter for each cable, select number of cables, type of raceway, fill type either 25 per cent, 60 per cent or auto. This program finds the correct raceway size. 
Voltage Drop Select the material either copper or aluminum, the size of the conductor, the voltage and phase from a list of common voltages, then enter the one way circuit length in feet, and load in amperes.  This program finds voltage drop, per cent voltage drop, and volts at end of circuit.
Voltage Drop for any voltage Select the material either copper or aluminum, the size of the conductor, then enter the voltage, the one way circuit length in feet, and load in amperes.  This program finds voltage drop, per cent voltage drop, and volts at end of circuit.
Minimum conductor Size for Given Voltage Drop Select the material either copper or aluminum, the size of the conductor, the voltage and phase from a list of common voltages, then enter the maximum voltage drop in per cent and load in amperes.  This program finds minimum conductor size, voltage drop and volts at end of circuit.
Maximum Length for Given Voltage Drop Select the material either copper or aluminum, the size of the conductor, the voltage and phase, then enter the volts, maximum voltage drop in per cent and load in amperes.  This program finds maximum conductor length in feet and volts at end of circuit.
Power Calculator P=ExI Enter power factor and select single or three phase and kilowatts or watts then enter any two values of power, volts, or amperes and calculate the remaining answer.
Power Calculator P=ExE/R Enter power factor and select single or three phase and kilowatts or watts then enter any two values of power, volts, or resistance and calculate the remaining answer.
Power Calculator P=IxIxR Enter power factor and select single or three phase and kilowatts or watts then enter any two values of power, amperes, or resistance and calculate the remaining answer.
Ohm's Law  Enter any two values of Volts, amperes, or resistance and calculate the remaining answer.
Grounding Conductor Size This program reads NEC Table 250.122.  Select the overcurrent protective device from the list that includes the standard overcurrent protective device sizes from Section 240.6(A) and this program finds the sizes of both the copper and aluminum equipment grounding conductors.
Grounding Electrode Conductor Size This program reads NEC Table 250.66.  Select the size of largest copper service entrance conductor or equivalent area for parallel conductors from the list or select size of largest aluminum service entrance conductor or equivalent area for parallel conductors from the list and this program finds the sizes of either the copper or aluminum equipment grounding electrode conductors.
Overcurrent Protective Device Size This program reads NEC Section 240.6(A) that lists the standard sizes for circuit breakers and fuses.  Select to size up or down and enter the amperes and this program finds the size of the overcurrent protective device.
Cable Tray Pulling Tension This program is very extensive and is used to set up long cable pulls in cable tray.  Examples are included.
Raceway Pulling Tension This program is extensive and is used to determine pulling tension when pulling conductors into raceways.  Examples are include.
Offset Distance Between Bends and Developed Length This program is calculates the precise distance between bends using trigonometry and does not use the inaccurate Benfield method.  A developed length calculator is also included.
Advanced Voltage Drop This program calculates voltage drop by finding the actual approximate operating temperature of the conductor and using the conductor's resistance at this temperature.
Excel Table 310.16 Reader This Excel spreadsheet reads Table 310.16 for copper conductors only.  This program is similar to the JavaScript program that reads Table 310.16.
                                    Below are rare Special Links of Interest
Building  Code Source Download just about any current Building Code for Free
and they are legal due to a court ruling in 2002.
Grounding Diagrams Classic assortment of grounding diagrams.  Includes  17
system grounding diagrams for services and standby generators.  Click on thumbnails to see full diagram.
Special Neher McGrath Papers PDF files of various classic papers on the current carrying capacity of conductors including the famous Neher McGrath and Samuel Rosch Papers.  Most of these papers came from the Engineering Societies Library in New York City in 1993.  (No longer in business)

 

                                    Below are Links about Arc Flash Hazard Analysis
Duke Computer Program Free Duke computer program (in DOS) and PDF manual used for calculating Incident energy.  This is a zipped file and requires the Winzip utility for unzipping.
The Other Electrical Hazard: Electric Arc Blast Burns Excellent paper on Arc Flash by Ralph H. Lee, IPSD 81-55, IA-18, No. 3, May/June 1982 (805k) PDF format.
Pressures Developed by Arcs Another excellent paper by Ralph H. Lee, Transactions on Industry Applications, vol. 1A-23, No 4, July/August 1987 (959 k) PDF format.
ARCING FLASH/BLAST REVIEW from Bussman  This excellent paper by Tim Crnko and Steve Dyrnes is still online at Bussman.  This paper highlights some of the findings that may help in safety management and equipment selection. This paper concludes with some design considerations that will help reduce the hazards of arcing faults.  PDF format.
Arcwear Site 
ArcWear is dedicated to providing the best information possible on protection from electrical arc hazards and flash fire conditions. You'll find a robust library of the latest knowledge on arc flash safety for your reference—regulations and test videos, articles and books, industry links, heat calculators and more.
 

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