![]() ![]() In addition to the information of the label, good arc flash labels often use a standardized format, described in the ANSI Z535 standard. It’s also common practice to include the date of the last arc flash risk assessment, making it easy to check if a label is up-to-date this is required by CSA Z462, the Canadian “sister standard” to NFPA 70E. For example, labels may include shock protection information, such as the Limited and Restricted Approach Boundaries. Where the PPE tables do not apply to a situation, the incident energy approach is needed.Įffective arc flash labels often include other elements, beyond that short list of required details. The arc flash PPE categories are generalized recommendations for some common circumstances, and the appropriate category for a situation is found by reading tables in NFPA 70E. Incident energy must be calculated for the exact equipment and installation in question, requiring detailed knowledge of the system and some careful math, often performed with specialized analysis software. This is because those two details reflect two different ways of assessing an arc flash hazard, and may give confusing or even conflicting recommendations. Note that a given piece of equipment should never be marked with both a calculated incident energy and an arc flash PPE category. The third item is a way to indicate what PPE is required, with some options for how to present that information. Then, the arc flash boundary provides a “stay-back” distance, where a worker without protection would receive second-degree burns in the event of an arc flash getting closer requires appropriate PPE. Site-specific description of PPE requiredįirst, the system voltage is a quick indicator of the equipment’s power level.Incident energy and working distance, or arc flash PPE category, but not both.Each arc flash warning label needs to include: However, the essential information requirements have been kept unchanged from the 2015 edition. In the new edition of NFPA 70E, the labeling requirements have been moved slightly they now appear in Article 130.5(H). Arc flash labels of some kind have been required by NFPA 70E for many years. ![]()
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