Change Summary

• A new Article 646 titled Modular Data Centers has been added to Chapter 6.
• Modular data centers are prefabricated units of information technology equipment and support equipment.
• Modular data centers are intended for fixed installation either indoors or outdoors.
• Article 646 closely follows Article 645, Information Technology Equipment and NFPA 75, Standard for the Protection of Information Technology Equipment

Expert Analysis

Modular Data Centers (MDCs) are important emerging trends in data center architecture. Their construction, installation and use results in a unique hybrid piece of equipment that falls somewhere in between a large enclosure and a pre-fabricated building. One informational note adds “A typical construction may use a standard ISO shipping container(s) or other structure as the outer enclosure.” Placing modular data centers within ISO standardized shipping containers allow modular assemblies of data centers to be easily loaded and unloaded, moved, stacked, securely transported and tracked efficiency. Standardized containers permit distance shipping via truck, tandem trailer, rail and intercontinental shipping possible. Article 646 generally limits modular data centers wiring methods and materials by requiring only listed and labeled equipment to follow the requirements within the Article 646. Article 646 was added to the NEC because it is not always obvious which requirements in the NEC were applicable or how they should be applied, given the complexity, customization and scalability of modular data centers. This new article provides requirements that enhance safety, support the design and development of safe products and provide clarity for installers, end users and Authorities Having Jurisdiction (AHJs).

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Our data center design and specifications team provide technical support, including design, layout, elevations, pathways, and specifications, customized to each installation. Email Leviton's data center team at dcteam@leviton.com