The NESC’s Arc Flash Requirements first appeared in the 2007 Edition. Determining how much incident energy could be available at a piece of equipment or location on a line is something you do not want to discover from a field test (accidental or intentional this means the only alternative is to predict it from calculations)
Beginning with the 2007 NESC, The Arc Flash Requirements are:
“Article 410.A.3 Effective as of January 1, 2009, the employer shall ensure that an assessment is performed to determine potential exposure to an electric arc for employees who work on or near energized parts or equipment. If the assessment determines a potential employee exposure
greater than 2 cal/cm2 exists, the employer shall require employees to wear clothing or a clothing system that has an effective arc rating not less than the anticipated level of arc energy.”
Download: NESC and Arc Flash Studies
