scope:

Products and Applications Included

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 drytype 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 (ANSI). The testing and maintenance of such panelboards is addressed in NECA 407, Standard for Installing and Maintaining Panelboards (ANSI).

Regulatory and Other Requirements

a) All information in this publication is intended to conform to the National Electrical Code® (ANSI/ NFPA Standard 70). Installers should always follow the NEC®, applicable state and local codes, and manufacturer's instructions when installing electrical equipment and systems.

b) Only qualified persons as defined in the NEC familiar with the construction and installation of electrical power distribution and control systems and equipment should perform the technical work described in this publication. Administrative functions and other tasks can be performed under the supervision of a qualified person. All work should be performed in accordance with NFPA 70E, Standard for Electrical Safety in the Workplace (ANSI).

c) General requirements for installing electrical products and systems are described in NECA 1, Standard for Good Workmanship in Electrical Construction (ANSI). Other National Electrical Installation Standards provide additional guidance for installing particular types of electrical products and systems. A complete list of NEIS is provided in Annex A.