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22.7 A switch or other device controlling one or more elements of an appliance intended for permanent connection to the power supply shall be of such construction that opening the switch will disconnect all of the ungrounded conductors of the supply circuit, unless there will be no live parts exposed to unintentional contact when the switch is open or unless the fact that such parts are live parts is apparent.$ j8 e. [3 ^2 h6 b
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: h- z; |6 b) l4 o6 O* ]! a 个人理解为:带有连接电热管的开关,开关线路不能断开电源电线路;
5 G9 |/ m# V. |# |) } 如果我在开关后面还有一个计时器来控制总的线路,这样连接行不?
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请各位百忙之中给予答复下,谢谢!; z% h3 e4 R4 H0 e8 W
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