This information comes from an OSHA Letter of Interpretation dated July 13, 2015: Question: Under 29 CFR 1910.269, can an employer use Table 410-1 of the 2012 National Electrical Safety Code (NESC) to select protective clothing and equipment? 1 Response: Paragraph (1)(8)(ii) of 29 CFR 1910.269 provides that "[f]or each employee exposed to hazards from electric arcs, the employer . . . make a reasonable estimate of the incident heat energy to which the employee would be exposed."