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Motor terminal box connection methods and procedures

Publication date: 
October 2014
Jim Bryan, EASA Technical Support Specialist
Type of media: 

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. We will not consider the starting method or internal connection of the motor, but only the methods used to connect the motor leads to incoming power.

Topics covered include:

  • Types of terminations
  • Insulating the joints
  • Medium voltage stress cones
  • Recommended torque values for lugs and split bolts
AC motors
DC motors
Terminal boxes (outlet boxes)