通过使用剩余电流可以获得额外的直接接触保护
额定工作剩余电流不超过30 mA的电流装置。
必须记住，使用剩余电流装置作为
防止直接接触并不意味着无需应用以下方法之一：
上述规定的保护措施。
防止间接接触的措施包括：
-自动断开电源：保护装置应自动
断开电路的电源，使接触电压暴露在外
导电部分的持续时间不足以导致有害的
对人类的生理影响；
-辅助绝缘或加强绝缘，例如通过使用II类
组件；
4.3直接和间接保护
间接接触
446电气设备| ABB
4保护人类
4.3直接和间接接触防护
-非导电位置：特定电阻值为的位置
隔热地板和墙壁(≥ 50千Ω 对于Ur≤ 500 V；≥ 10万Ω 对于Ur
>500 V）
内部无保护导体；
-电气隔离，例如使用隔离变压器为
环行
-无地局部等电位连接：外露导电
零件连接在一起，但未接地。
后，以下措施提供了针对两种直接
和间接接触：
-SELV（安全超低电压）系统和PELV（保护超低电压
电压）系统；
-FELV（功能超低电压）系统。

An additional protection against direct contact can be obtained by using residual current devices with a rated operating residual current not exceeding 30 mA. It must be remembered that the use of a residual current device as a mean of protection against direct contacts does not obviate the need to apply one of the above specified measures of protection. The measures of protection against indirect contact are: - automatic disconnection of the supply: a protective device shall automatically disconnect the supply to the circuit so that the touch voltage on the exposed conductive part does not persist for a time sufficient to cause a risk of harmful physiological effect for human beings; - supplementary insulation or reinforced insulation, e.g. by the use of Class II components; 4.3 Protection against both direct and indirect contact 446 Electrical devices | ABB 4 Protection of human beings 4.3 Protection against both direct and indirect contact - non-conducting locations: locations with a particular resistance value of insulating floors and walls (≥ 50 kΩ for Ur ≤ 500 V; ≥ 100 kΩ for Ur > 500 V) and without protective conductors inside; - electrical separation, e.g. by using an isolating transformer to supply the circuit; - earth-free local equipotential bonding: locations where the exposed conductive parts are connected together but not earthed. Finally, the following measures provide combined protection against both direct and indirect contact: - SELV (Safety Extra Low Voltage) system and PELV (Protective Extra Low Voltage) system; - FELV (Functional Extra Low Voltage) system.