低压电气装置. 第7-753部分: 特殊安装或场所要求. 供热电缆和嵌入式加热系统

[中文适用范围]： 本部分IEC 60364适用于表面加热的嵌入式电加热系统。它也适用于防冰、防霜或类似应用的电加热系统。室内和室外系统均包括在内。不适用于符合IEC 60519、IEC 62395和IEC 60079相关部分的工业和商业应用加热系统。注：本标准涵盖的加热系统示例包括用于墙壁、天花板、地板、屋顶、排水管、 gutter（排水槽）、管道、楼梯、道路、未硬化的压实区域（例如足球场、草坪）的加热系统。 [外文原描述]： IEC 60364-7-753:2014 applies to embedded electric heating systems for surface heating. It also applies to electric heating systems for de-icing or frost prevention or similar applications. Both indoor and outdoor systems are covered. Heating systems for industrial and commercial applications complying with relevant parts of IEC 60519, IEC 62395 and IEC 60079 are not covered. This second edition cancels and replaces the first edition published in 2005 and constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: - the title has been changed from "Floor and ceiling heating systems" to "Heating cables and embedded heating systems" to align with the revised scope; - the scope has been extended and now covers embedded electric heating systems for surface heating, also electric heating systems for de-icing or frost prevention or similar applications, and covers both indoor and outdoor systems. This includes heating systems for: walls, ceiling, floors, roofs, drainpipes, gutters, pipes, stairs, roadways, non-hardened compacted areas (e.g. football fields, lawns); - for wall heating systems, this standard contains additional requirements (e.g. metal sheath/enclosure/grid) to protect against the effects of overheating caused by a short-circuit between live conductors due to penetration of an embedded heating unit; - from heating units delivered from the manufacturer without exposed-conductive-parts, this standard requires a metallic mesh grid covering. This has been reduced to 3 mm for wall heating systems; - this standard now requires that electric heating systems shall be selected and erected so as to avoid any harmful influence between the heating system and any electrical or non-electrical installations envisaged; - and this standard covers surface temperatures and now refers the reader to the appropriate IEC guide.