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Version 6.10
General Information
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Branch Circuit Load Calcs
Circuit Layout
Cable Tray Fill
Circuit Load Analysis
Conduit Fill
Device and Metal Box Fill
Efficiency Factor
Motor Ampacity and Characteristics
Motor Startup Ampacity
Ohm’s Law
Power Factor
Power Factor Correction
Resistor Color Codes
Series Location Voltage Drop
Transformer Sizing
Unit Conversions
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Wireway Fill
 
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Motor Ampacity (FLA)(FLC) and Characteristics
     
  Volts' Motor Ampacity and Characteristics module uses either NEC® Tables 430.247, 430.248, 430.249 and 430.250 OR known motor nameplate values for its computations.
   
 

   
  When entering data from the NEC® Motor Ampacity Tables:
  Volts interpolates the power value to the correct amperage if an exact match is not found in these tables. For example, a 7 1/2 hp inductive motor is rated at 22 amperes at 220 volts. What about an 8 hp motor? Volts' interpolation algorithm makes it easy. Volts calculates amperage values either above or below the NEC® tables and displays the results.
   
  When entering data from the known motor nameplate values:
  Volts utilizes your entered nameplate values and computes the motor's required ampacity.
   
 

This module computes:

 
  • The motor's full load amperes (FLA or FLC)
  • Required overload (primary) protection
  • Required overcurrent (secondary) protection
  • Locked rotor amperes (LRA)
  • NEMA starter size
  • Reactive power in kVARs
     

It simply cannot be any easier or more accurate to obtain the correct information the first time.

 

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Reprinted with permission from NFPA 70 2008, NEC® copyright© 2008, National Fire Protection Association. This is not the complete and official position of the NFPA on the referenced subject which is represented only by the standard in its entirety. The title National Electric Code® and the acronym NEC® are registered trademarks of the National Fire Protection Association (NFPA).

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