标准摘要
[中文适用范围]： IEC 61557的本部分规定了对TT、TN和IT系统中通过定期断开剩余电流保护装置（RCD）来测试保护措施有效性的测量设备的要求。 [外文原描述]： Specifies the requirements for measuring equipment applied to the testing of the effectiveness of protective measures by regular disconnections of residual current protective devices (RCD) in TT, TN and IT systems. This second edition cancels and replaces the first edition published in 1997. This edition constitutes a technical revision. The following changes were made with respect to the previous edition (1997): a) title and scope complemented; b) definitions complemented; c) revision of requirements; d) "tripping tests" and "non-tripping tests" subclauses complemented; e) markings complemented; f) addition of Annex A.
英文名称Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. - Equipment for testing, measuring or monitoring of protective measures - Part 6: Effectiveness of residual current devices (RCD) in TT, TN and IT systems