Concentric to Lap Conversions - ANSI Accredited Standards Developer Information - EASA | The Electro•Mechanical Authority
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For information about ANSI/EASA AR100 or questions about the work on this standard, contact:

Mike Howell, PE
EASA Technical Support Specialist
+1 314 993 2220
mhowell@easa.com

ANSI Accredited Standards Developer Information

Concentric to Lap Conversions

  • December 2025
  • Number of views: 2479
  • Article rating: No rating

AKARD COMMUTATOR of TENNESSEE (ACT)Tom Bishop, PE
EASA Senior Technical Support Specialist

One of the most frequent member requests to EASA’s technical support group is for the conversion of a 3 phase winding from concentric to lap. This presentation covers the important details for a proper concentric to lap winding conversion.  

Primary topics are the most common methods for concentric to lap conversion:

  • “Rule of thumb”
  • Concentric to lap conversion tables in EASA Technical Manual
  • EASA AC Verification and Redesign (ACR) computer program
  • Hand/manual calculation

This presentation is intended for winders, engineers, supervisors and managers. The content will be beneficial for beginners through highly experienced persons.

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