Issue link: https://cp.revolio.com/i/488587
6 | THE DATA CENTER JOURNAL www.datacenterjournal.com the system meets the listed criteria for short-circuit current and speed of response of circuit protection. If a data center manager does not have access to the data and information needed to use the tables correctly, an engineering analysis must be performed. e arc-flash hazard assessment must be updated when a major modification or renovation is made to the electrical-distri- bution system or at least every five years to account for any changes in the system or changes to regulatory guidance. Apply arc-flash hazard labels. Both the National Electrical Code (NEC) and NFPA 70E require data center owners to apply an arc-flash hazard warn- ing or label to electrical equipment in the field including switchboards, switchgear, panel boards, industrial control panels, meter socket enclosures and motor-control panels that are likely to require mainte- nance while energized. e arc-flash hazard labels must include nominal system voltage, arc-flash boundary, minimum arc rating of clothing, site-specific level of PPE and at least one, but not both, of the following: • Available incident energy and the corresponding working distance (if the arc-flash boundary was calcu- lated through engineering analysis) • Arc-flash PPE category in the NFPA 70E tables (if the table method was used to calculate arc-flash boundary) e calculation method and the data that supports the information on the arc- flash labels must be documented. Arc-flash labeling is also required for DC equipment in addition to AC equipment. Perform a battery-related risk assessment. Before any work on a battery system, a risk assessment must be performed to identify the chemical, electrical-shock and arc-flash hazards and to assess the risks as- sociated with the tasks to be performed. Evaluate non-labeled electrical equipment. e process of listing and labeling electrical products is an important practice that helps ensure compliance with codes and standards published by NFPA, ANSI, and International Association of Electrical Inspectors (IAEI). NEC addresses the im- portance of approving electrical equipment and listing and labeling the equipment to provide evidence of the equipment's ac- ceptability to the jurisdictional authority. Although most new equipment will already be properly labeled, there has been a significant increase in one-of-a kind, lim- ited-production, used and modified elec- trical products that are not listed or labeled under a certification program. NFPA stan- dards 790 and 791 have been introduced to address this issue. ese standards provide guidance for field evaluation and labeling of non-labeled equipment. e standards require that field-evaluation bodies estab- lish rigorous assessment/testing procedures and apply recognized safety standards to the equipment being evaluated.