Code authorities use the National Electrical Code when assessing modular data centers.

NFPA 70, more commonly known as the National Electrical Code (NEC), contains Article 646 on modular data centers (MDCs). This article contains specific requirements and identifies other areas in the NEC that apply to MDCs. One of Article 646’s key provisions is Section 646.4, which states that UL Certified (Listed) MDCs are used in lieu of evaluating the MDC to all of Article 646’s provisions. When a UL Certified MDC is installed, only a limited number of additional provisions from Article 646 apply. Certifying an MDC to UL 2755, the Outline of Investigation for Modular Data Centers, also provides assurance that the equipment complies with the applicable requirements prior to its leaving the manufacturing facility. This is important since MDCs are often prefabricated with the installed wiring concealed and not easily accessible for code authority inspection at the final installation site.

For manufacturers, this gives their customers confidence that the product is compliant with applicable requirements. It can help to mitigate risks, if the product is no longer compliant because of activities that occurred after shipment to the customer.

Learn more: www.ul.com/services/modular-data-center-testing-and-certification