IEC Motor Data Calculator



We will continue showing a lot of excellent electrical calculation spreadsheets which are listed in our page “Electrical calculation spreadsheets”.

I explained before the Motor Data Calculator as per NEMA standard products and today, I will explain another Motor Data Calculator but as per IEC code products.


IEC Motor Data Calculator spreadsheet Manual (based on NEC 2011):

IEC Motor Data Calculator

IEC Motor Data Calculator spreadsheet includes three different worksheets as follows: 

  1. Motor calculator worksheet.
  2. Wire, cable and voltage drop calculator worksheet.
  3. Instruction and notes worksheet.

Now, I will explain each worksheet as follows:


First: Motor calculator worksheet 


In the Scheduler Section, enter the start date (MM/DD/YYYY Format) and the number of weeks to view the resulting end date. This Scheduler is Helpful in determining ship dates and project schedules.

Input data: 




Check the motor you have if it is single or three phase and use corresponding section (single phase or three phase section) for entering the input data.



Single phase section
Three phase section
1- Select the motor horse power rating from the drop down box, the available ratings ranges from 1/6 HP to 7.5 HP. 1- Select the motor voltage rating from the drop down box, the available values are 200 (208)V, 230 (240)V, 460 (480)V, 575 (600)V.

2- Select the motor horse power rating from the drop down box, the available ratings ranges from 0.5 HP to 200 HP.



Output data:



Single phase section
Three phase section
Check the Motor voltage rating if it is 115 V or 230 V and use the output data corresponding to its voltage rating value.
The output data will include:

The output data will include:
Motor Full Load Amps (FLA)

Motor Full Load Amps (FLA)
Wire Size

Wire Size
Time-Delay Fuse Rating (Amps)

Time-Delay Fuse Rating (Amps)
PowerPact Breaker Size (Amps)

PowerPact MCP Size (Amps)
IEC Contactor Cat#

IEC Contactor Cat#
IEC Overload Relay Cat#

IEC Overload Relay Cat#


For more information about for MCP (Motor Circuit Protector), please click on the link.

Note:

In case of single phase we select breaker size but in case of there phase the selection is for MCP (Motor Circuit Protector) which offer a better Motor short circuit protection and mor reliable motor starts-up.




Te Sys Self-Protected Starters Selection Table
Input data :
1- Select the motor voltage rating from the drop down box, the available values are 200 (208)V, 230 (240)V, 460 (480)V, 575 (600)V
2- Select the motor horse power rating from the drop down box, the available ratings ranges from 0.5 HP to 25HP (see note in below of table)
Output data:
Motor full load amps (FLA)
Te Sys U Power Base
Te Sys U Control Unit

For more information about Te Sys Self-Protected Starters, please click on the link.

Note: Don’t use Te Sys Self-Protected Starters Selection Table for heavy service applications (above 25 HP).


Second: Wire, Conduit and Voltage Drop calculator worksheet (Based on NEC – Appendix C – Tables C1 and C1A)

Wire, Conduit  and Voltage Drop Worksheet
 
A- Wire, Conduit section:


Wire and Conduit section


Input data
output data
1- Select the wire size AWG/Kcmil as preliminary selection from the drop down box
1- Wire Ampacity at 75°c based on NEC Table 310.15
2- Check the conductor material type to be used, is it Copper or Aluminum? and use the output data corresponding to its conductor material type.
2- Conduit size in inches
3- Select the insulation material type to be used; is it THW, THW-2 THHN or THHN, THWN, XHHW, THWN2, XHHW-2? And use the output data corresponding to its insulation material type.

4- Select the Motor wire configuration to be used, is it single phase, 3 wires or three phase, 4 wires? And use the output data corresponding to its wire configuration type.


Notes:
  • Ampacity of conductors based on 30°c ambient temperature. 
  • Conduit sizes for aluminum wires based on the use of compact conductors ( conduit sizes for wire size below #8 AWG not be available) 
  • Where a major portion of the load consists of non-linear loads, the neutral is considered to be current carrying conductor. 
  • On 4-wire applications, de-rate the ampacity to 80% per note 8 and note 10 of the NEC amacity Tables. 

B- Voltage drop section:


Voltage Drop Section

Input data
Output data
1- Select the wire size ( this done in the first section: wire and conduit) 1- Line to Line Volts Drop in (Volts) per Ampere per 100 ft distance in magnetic conduit copper wire in two cases:

2- Enter the cable run distance in multiples of 100 ft (i.e. 100 ft= 1 & 200 ft= 2 and go on ...)

a- Case#1: single phase volts at 95% PF or 80% PF
3- Enter the motor load current (in Amps) b- Case#2: Three phase volts at 95% PF or 80% PF


2- Select the output data corresponding to your case.


For reviewing the NEC Rules controlling Voltage Drop, please review our previous Topic for Siemens Voltage Drop Calculations Spreadsheet.


Third: Instruction and notes worksheet:

 
Instruction Worksheet
Use the information work sheet as a guide for doing the calculations as per every case condition.

Also, it will guide you for adjusting of your results by applying the mentioned notes in it, which are as follows:

  • Fuses and circuit breakers shown are for short circuit ground fault protection only. This data applies to normal service applications of switches, starters or breakers shown. 
  • Don’t use for heavy service applications, as defined in the latest online catalog digest. Data is based on information available at time of publication and is subject to change. See actual installed equipment and section 110-14C for termination requirements.
  • Fuse sizes and circuit breaker trip amperes are approximate selections suitable for most installations. Thermal unit selectors are not based on NEC currents (see NEC 430.6 – Ampacity and motor rating determination) but are selected from average full load currents. Thermal units can be more accurately selected using table furnished with starter and full load current marked on the motor name plate. 


To download your copy from the IEC Motor Data Calculator, please click on the link.



1 comment:

  1. I found your website the other day and after reading a handful of posts, thought I would say thank you for all the great content. Keep it coming!

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