低压电气装置 第4-42部分：安全防护 热效应防护

[中文适用范围]： 本部分适用于低压电气装置，旨在采取措施保护人员、牲畜和财产免受以下影响：- 热效应、材料燃烧或降解的风险、以及由电气设备引起的烧伤风险；- 当火灾从电气装置传播到附近的、被屏障隔开的其他火灾 compartment 时，火焰传播的风险；- 包括安全服务在内的电气设备因热效应而丧失安全运行功能的风险。注：对于爆炸风险，请参阅IEC 60079-14。本组安全出版物（GSP）侧重于基本安全要求，主要 intended 作为所述安装的产品安全标准使用，同时也 intended 供技术委员会（TC）在准备与上述安装类似的出版物时使用，遵循IEC指南104和ISO/IEC指南51中规定的基本原则。 [外文原描述]： IEC 60364-4-42:2024 applies to electrical installations with regard to measures for the protection of persons, livestock and property against: • thermal effects, risk of combustion or degradation of materials, and risk of burns caused by electrical equipment, • flames in case of a fire hazard being propagated from electrical installations to other fire compartments segregated by barriers which are in the vicinity, and • the impairment of the safe functioning of electrical equipment, including safety services due to thermal effects. This group safety publication (GSP) focusing on safety essential requirements is primarily intended to be used as a product safety standard for the installations mentioned in the scope, but is also intended to be used by TCs in the preparation of publications for installations similar to those mentioned in the scope of this GSP, in accordance with the principles laid down in IEC Guide 104 and lSO/lEC Guide 51. One of the responsibilities of a TC is, wherever applicable, to make use of basic safety publications and/or group safety publications in the preparation of its publications This fourth edition cancels and replaces the third edition published in 2010 and Amendment 1:2014. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) the Scope now includes a new paragraph stating that IEC 60364-4-42 has become a group safety publication (GSP) following the Advisory Committee on Safety (ACOS) recommendation for approval of the group safety function "protection against thermal effects for any kind of low-voltage electrical installations" to TC 64; this GSP is primarily intended to be used as a product safety standard for the installations mentioned in the scope, but also to be used by TCs in the preparation of publications for installations similar to those mentioned in the scope of this GSP; b) new terms and definitions have been added; c) a new Subclause 421.6 regarding measures for preventing fires originating from the use of an electrical stove or cooker or hob has been added; d) the previous Subclause 421.7 was expanded and moved to a new Clause 426: Additional protective measures against thermal effect for locations where consequences of fire are severe; e) requirements for escape routes have been expanded and modified; f) requirements for final circuits in BE2 locations have been expanded and modified; g) requirements for locations with irreplaceable goods or with business critical facilities have been expanded and modified; h) a new Clause 425 for protection against fire due to fault currents has been added; i) a new Clause 427 for protection against assembly internal arc faults has been added