What is the purpose of a millwright racking out a breaker within the local M.C.C. before performing an alignment?

The purpose of a millwright racking out a breaker within the local motor control center (M.C.C.) before performing an alignment is primarily to prevent accidental starts or stops of the equipment. By racking out the breaker, the millwright ensures that the power supply to the motor and associated components is completely disconnected. This is a critical safety measure that protects both the worker and the equipment during the alignment procedure.

Additionally, when performing tasks that require precision, such as alignment, ensuring that the machinery cannot accidentally start helps maintain a safe working environment. It's essential to eliminate any chance of unexpected movements that could lead to injury or damage, particularly since alignment often requires close physical proximity to moving parts.

Understanding the importance of safety in such environments emphasizes why this step is fundamental for millwrights before engaging in further technical tasks like alignment.