NFPA 70, NEC 2005: Article 409

Industrial Control Panel Short Circuit Panel Ratings

Executive Summary
Many panel shops are providing industrial control panels with improper short circuit current ratings or no short circuit current ratings at all. This creates a potential for accidental improper installation of control panels by trained installers, plus a possible fire and safety hazard. The National Fire Protection Association (NFPA) has implemented strict and very concise rules in the latest National Electric Code (NEC) to facilitate the safe design, marking, installation, and inspection of industrial control panels (ICP).