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Identifying Unmarked Leads of Three-Phase Motors

  • October 2024
  • Number of views: 1425
  • Article rating: 5.0
FREE for Members of EASA
Webinar recording

This presentation reviews procedures that explain how to identify unmarked leads of three-phase motors with one or two windings.

Motor terminal box connection methods and procedures

  • October 2014
  • Number of views: 18216
  • Article rating: 4.2
Article

As with most tasks, there are many ways to terminate motor leads and each one has a following who believe it is the best method. Here we will discuss some of these procedures and outline a few of the advantages and disadvantages of each.

Identifying 9 unmarked leads of three-phase motors

  • April 2011
  • Number of views: 7927
  • Article rating: 5.0
Article

The markings on the external leads of a motor sometimes become defaced or are removed, which makes it necessary to identify and mark them before the motor can be properly connected to the line. This article will address lead identification of three-phase motors with 9 leads, based on the premise that none of the leads are marked. If some of the leads are marked, the process is the same, but may require fewer steps.

Identificando los 9 cables no marcados en motores trifásicos

  • April 2011
  • Number of views: 5120
  • Article rating: No rating
Article

Si algunos están marcados, el procedimiento es el mismo, pero se requerirán  menos pasos Algunas veces, los cables de salida de los motores no se encuentran  iden-tificadoso sus marcas no  son legibles, por lo que se hace necesario  marcarlos para poder  conectar el motor adecua-damente  a la línea de alimentación. Este artículo se ocupará de cómo identificar los cables de los motores eléctricos con 9 cables de salida y se  basa en la premisa de que ninguno de los  cables se encuentra marcado. Si alguno de ellos estuviera identificado,el procedimiento es el mismo, pero se requerirán menos pasos.

Important questions to ask when your customer orders a 12-lead motor

  • December 2008
  • Number of views: 4181
  • Article rating: No rating
Article

When a customer calls and orders a motor, he usually specifies only the hp/kW rating, rpm, frame, enclosure and voltage rating. That leaves at least one critical area where the electrician can go wrong: The starting method and number of leads. As manufacturers produce more motors with 12 leads to increase versatility and reduce inventory requirements, there is an increased chance of error by the end user.

Ampacity of lead wire and bus bar: Variables to consider

  • May 2007
  • Number of views: 5234
  • Article rating: 4.0
Article

When repairing motors, we often take the lead wire ampacity charts for granted, without giving much thought to how they were developed. Who figured out how much current is acceptable for a specific lead wire, and why are there different ratings for different types of insulation? This article will cover some often-overlooked facts about ampacity.

Getting The Most From Your Electric Motors

Getting The Most From Your Electric Motors - coverThis 40-page booklet provides great advice for obtaining the longest, most efficient and cost-effective operation from general and definite purpose electric motors.

This booklet covers topics such as:

  • Installation, startup and baseline information
  • Operational monitoring and maintenance
  • Motor and baseline installation data
  • How to read a motor nameplate
  • Motor storage recommendations

LEARN MORE AND DOWNLOAD MÁS INFORMACIÓN Y DESCARGAR BUY PRINTED COPIES

READ MORE ABOUT THE FEATURES AND BENEFITS

EASA/AEMT Rewind Study

EASA Rewind Study cover

The Effect of Repair/Rewinding on Premium Efficiency/IE3 Motors
Tests prove Premium Efficiency/IE3 Motors can be rewound without degrading efficiency.

DOWNLOAD THE FULL RESULTS

ANSI/EASA AR100-2020

ANSI/EASA AR100-2015 cover

Recommended Practice for the Repair of Rotating Electrical Apparatus
This is a must-have guide to the repair of rotating electrical machines. Its purpose is to establish recommended practices in each step of the rotating electrical apparatus rewinding and rebuilding processes.

DOWNLOAD - ENGLISH

DESCARGAR - ESPAÑOL

EASA Technical Manual

EASA Technical Manual cover

Revised May 2024
The EASA Technical Manual is the association's definitive and most complete publication. It's available FREE to members in an online format. Members can also download PDFs of the entire manual or individual sections.

VIEW & DOWNLOAD