\n
\n
![\"\"](\"https:\/\/gezhi-tech.com\/wp-content\/uploads\/2024\/08\/basic-insulation-internal-view.jpg\")
\n<\/figure><\/div>
\n
![\"\"](\"https:\/\/gezhi-tech.com\/wp-content\/uploads\/2024\/08\/basic-insulation.jpg\")
\n<\/figure><\/div><\/div>
\n
![\"\"](\"https:\/\/gezhi-tech.com\/wp-content\/uploads\/2024\/08\/double-insulation.gif\")
\n<\/figure>
\nThe following circuit board picture has an animation effect. The right side of the dotted line is the inaccessible part with a working voltage<\/strong><\/a> of 220-240V, and the left side of the dotted line is the accessible part<\/strong><\/a> with a maximum working voltage of 24V (assuming that the structure at the location of the dotted line has met the requirements of double insulation<\/strong><\/a> or reinforced insulation<\/strong><\/a>). In order to ensure effective isolation, generally speaking, the wires on the right side of the dotted line (red and blue internal wires) cannot touch the relatively thin internal wires on the left. The wire sheath of the right wire is basic insulation, because the wire sheath is in direct contact with the live parts and is the first layer of protection for the live parts. The wire sheath of the left wire can only be defined as supplementary insulation<\/strong><\/a>, but whether it meets the requirements for supplementary insulation in clause 29.3 will be analyzed when introducing clause 29.3.
It should be noted here that the wire sheath of the left wire cannot be defined as basic insulation, and the wire sheath of the right wire cannot be supplementary insulation.
\n
\n
![\"\"](\"https:\/\/gezhi-tech.com\/wp-content\/uploads\/2024\/08\/double-insulation-in-switch-power-supply.gif\")
\n<\/figure>","protected":false},"excerpt":{"rendered":"
\u4e8c\u91cd\u7d76\u7e01\uff1a\u57fa\u790e\u7d76\u7e01\u3068\u88dc\u52a9\u7d76\u7e01\u3092\u4f75\u7528\u3057\u305f\u7d76\u7e01\u65b9\u5f0f \u6b21\u306e\u56de\u8def\u57fa\u677f\u306e\u753b\u50cf\u306b\u306f\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u52b9\u679c\u304c\u3042\u308a\u307e\u3059\u3002\u70b9\u7dda\u306e\u53f3\u5074\u306f\u52d5\u4f5c\u96fb\u5727 220 \uff5e 240V \u306e\u30a2\u30af\u30bb\u30b9\u4e0d\u53ef\u80fd\u306a\u90e8\u5206\u3067\u3042\u308a\u3001\u70b9\u7dda\u306e\u5de6\u5074\u306f\u6700\u5927\u52d5\u4f5c\u96fb\u5727 24V \u306e\u30a2\u30af\u30bb\u30b9\u53ef\u80fd\u306a\u90e8\u5206\u3067\u3059 (\u70b9\u7dda\u306e\u4f4d\u7f6e\u306e\u69cb\u9020\u304c\u6b63\u5e38\u3067\u3042\u308b\u3068\u4eee\u5b9a\u3057\u307e\u3059)\u3002\u30e9\u30a4\u30f3\u306f\u4e8c\u91cd\u7d76\u7e01\u307e\u305f\u306f\u5f37\u5316\u7d76\u7e01\u306e\u8981\u4ef6\u3092\u6e80\u305f\u3057\u3066\u3044\u307e\u3059\uff09\u3002\u52b9\u679c\u7684\u306a\u7d76\u7e01\u3092\u78ba\u4fdd\u3059\u308b\u305f\u3081\u306b\u3001\u4e00\u822c\u7684\u306b\u3001\u70b9\u7dda\u306e\u53f3\u5074\u306e\u30ef\u30a4\u30e4 (\u8d64\u3068\u9752\u306e\u5185\u90e8\u30ef\u30a4\u30e4) \u306f\u3001\u5de6\u5074\u306e\u6bd4\u8f03\u7684\u7d30\u3044\u5185\u90e8\u30ef\u30a4\u30e4\u306b\u89e6\u308c\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\u3002\u53f3\u5074\u306e\u30ef\u30a4\u30e4\u306e\u30ef\u30a4\u30e4 \u30b7\u30fc\u30b9\u306f\u57fa\u790e\u7d76\u7e01\u3067\u3059\u3002\u3053\u308c\u306f\u3001\u30ef\u30a4\u30e4 \u30b7\u30fc\u30b9\u304c\u5145\u96fb\u90e8\u3068\u76f4\u63a5\u63a5\u89e6\u3057\u3066\u304a\u308a\u3001\u5145\u96fb\u90e8\u3092\u4fdd\u8b77\u3059\u308b\u6700\u521d\u306e\u5c64\u3067\u3042\u308b\u305f\u3081\u3067\u3059\u3002\u5de6\u5074\u306e\u96fb\u7dda\u306e\u96fb\u7dda\u30b7\u30fc\u30b9\u306f\u88dc\u52a9\u7d76\u7e01\u3068\u3057\u3066\u306e\u307f\u5b9a\u7fa9\u3067\u304d\u307e\u3059\u304c\u3001\u7b2c 29.3 \u9805\u306e\u88dc\u52a9\u7d76\u7e01\u306e\u8981\u4ef6\u3092\u6e80\u305f\u3057\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u306f\u3001\u7b2c 29.3 \u9805\u3092\u5c0e\u5165\u3059\u308b\u969b\u306b\u5206\u6790\u3055\u308c\u307e\u3059\u3002 \u3053\u3053\u3067\u3001\u5de6\u5074\u306e\u96fb\u7dda\u306e\u96fb\u7dda\u88ab\u8986\u3092\u57fa\u790e\u7d76\u7e01\u3001\u53f3\u5074\u306e\u96fb\u7dda\u306e\u96fb\u7dda\u88ab\u8986\u3092\u88dc\u52a9\u7d76\u7e01\u3068\u3059\u308b\u3053\u3068\u306f\u3067\u304d\u306a\u3044\u3053\u3068\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002 As shown in the following two pictures(fan), the internal lead wires sheath in the left picture is basic insulation<\/strong><\/a>, and the bottom plate of the outer casing is additional insulation. 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