《低壓電氣裝置 第4-41部分：安全防護 電擊防護》GB/T 16895.21-2020/IEC 60364-4-41:2017 Low-voltage electrical installations Part 4 – 41：Protection for safety –Protection against electric shock，4次提到“不超過30mA”RCD的設置要求，且均為附加防護！分別如下：
411.1 通則
Where specified, additional protection is provided by a residual current protective device (RCD) with rated residual operating current not exceeding 30 mA in accordance with 415.1.
當有具體規定時，可采用符合415.1條要求的額定剩余電流動作值不超過30mA的剩余電流動作保護電器(RCD)作附加防護措施。
411.3.3 用于插座和戶外移動設備的供電更進一步的要求
Further requirements for socket-outlets and for the supply of mobile equipment for use outdoors
Additional protection by means of a residual current protective device (RCD) with a rated residual operating current not exceeding 30 mA shall be provided for
◆a.c. socket-outlets with a rated current not exceeding 32 A that are liable to be used by ordinary persons and are intended for general use; and
◆a.c. mobile equipment for use outdoors with a rated current not exceeding 32 A.
額定動作電流不超過30mA的剩余電流動作保護電器(RCD)作為附加防護用于：
①供一般人員用普通用途的額定電流不超過32A的交流插座，和
②供戶外額定電流不超過32A的交流移動式設備。
411.3.4 在TN和TT系統中用于照明回路的附加要求
Additional requirements for circuits with luminaires in TN- and TT-systems
In premises designed to accommodate a single household, additional protection by a residual current protective device (RCD) with a rated residual operating current not exceeding 30 mA shall be provided for a.c.final circuits supplying luminaires.
對于單獨住戶的房屋向照明供電的交流終端回路，應提供額定剩余動作電流不超過30mA的剩余電流動作保護電器(RCD) 作為附加防護。
415.1.1 在交流系統內裝設額定剩余電流不大于30mA的RCD，用以在基本防護失效和/或故障保護或用電不慎時的附加防護措施。
The use of RCDs with a rated residual operating current not exceeding 30 mA, is recognized in a.c. systems as additional protection in the event of failure of the provision for basic protection and/or the provision for fault protection or carelessness by users.
結論
①擁于保護人身安全的RCD作為電擊防護的附加防護措施，其額定剩余電流動作值都不應大于30mA。
②國標與IEC標準是一脈相承的！
作者：李炳華(“鳥巢”電氣總設計師)
