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通過使用剩余電流可以獲得額外的直接接觸保護
額定工作剩余電流不超過30 mA的電流裝置。
必須記住，使用剩余電流裝置作為
防止直接接觸并不意味著無需應用以下方法之一：
上述規(guī)定的保護措施。
防止間接接觸的措施包括：
-自動斷開電源：保護裝置應自動
斷開電路的電源，使接觸電壓暴露在外
導電部分的持續(xù)時間不足以導致有害的
對人類的生理影響；
-輔助絕緣或加強絕緣，例如通過使用II類
組件；
4.3直接和間接保護
間接接觸
446電氣設備| ABB
4保護人類
4.3直接和間接接觸防護
-非導電位置：特定電阻值為的位置
隔熱地板和墻壁(≥ 50千? 對于Ur≤ 500 V；≥ 10萬? 對于Ur
>500 V）
內部無保護導體；
-電氣隔離，例如使用隔離變壓器為
環(huán)行
-無地局部等電位連接：外露導電
零件連接在一起，但未接地。
后，以下措施提供了針對兩種直接
和間接接觸：
-SELV（安全超低電壓）系統(tǒng)和PELV（保護超低電壓
電壓）系統(tǒng)；
-FELV（功能超低電壓）系統(tǒng)。

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 k? for Ur ≤ 500 V; ≥ 100 k? 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.