Failure to protect personnel adequately against injury or death from an arc flash event can financially decimate a company. The failure to comply with the requirements and guidelines of the Occupational Safety and Health Administration (OSHA), National Electrical Code (NEC), and National Fire Protection Association (NFPA) 70E can cost you time and money through fines and unexpected downtime. In this article, we will be exploring one piece of data in Arc Flash Study models: cables, specifically the effect of length on the accuracy of incident energy calculations.