Low-voltage electrical installations. Part 4-42: Protection for safety. Protection against thermal effects

This document establishes specific safety principles regarding thermal effects within low-voltage electrical installations. It outlines essential measures designed to prevent risks arising from excessive heat generation in electrical systems. The provisions focus on the protection of persons, livestock, and property against dangers posed by high temperatures that may occur during normal operation or under fault conditions. Key requirements include the selection of appropriate conductors, the sizing of protective devices, and the implementation of adequate insulation to ensure thermal stability. The text addresses scenarios such as overload currents, short-circuit events, and potential arcing, providing guidelines for the design and verification of electrical circuits. It also covers the installation of equipment to maintain safe operating temperatures and the prevention of fire hazards associated with thermal stress. By adhering to these technical specifications, installers can ensure that electrical systems remain safe under various environmental and operational loads. The content serves as a technical reference for engineers and professionals involved in the planning and execution of electrical safety in buildings and structures.