NECA 402-2014

This standard describes the installation and maintenance procedures for low-voltage motor control centers (MCCs) rated 600 VAC or less with a horizontal bus rating of 2,500 amperes or less.

MCCs may be assembled with factory-installed dry-type transformers and panelboards. The testing and maintenance of such dry-type transformers is addressed in NECA 409, Standard for Installing and Maintaining Dry-Type Transformers. the testing and maintenance of such panelboards is addressed in NECA 407, Standard for Installing and Maintaining Panelboards.

Motor control centers are typically installed in commercial and industrial facilities. They are an economical and effective method to consolidate several motor controllers in the same location. This simplifies servicing motors and facilitates monitoring of control systems and facilities mechanical and HVAC system operations.