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建筑物电气装置第1部分：范围、目的和基本原则建筑物电气装置第4部分：安全防护第42章：热效应保护这两项标准是（建筑物电气装置）系列标准的组成部分，其他部分分别为：第2部分：定义；第3部分：一般特性评估；第5部分：电器设备的选择和安装；第6部分：检验；第7部分：对特
Electrical installations of buildings - Part 1: Scope, purpose and basic principles - Building electrical installations - Part 4: Safety protection - Chapter 42: Protection against thermal effects - These two standards are part of a series of standards for building electrical installations. For: Part 2: Definitions; Part 3: Evaluation of general characteristics; Part 5: Selection and installation of electrical equipment; Part 6: Inspection; Part 7: Specific