接触电流和保护导体电流的测量方法

[中文适用范围]： 本国际标准定义了可流经人体的正弦或非正弦波形的直流或交流电流的测量方法；流过保护导体的电流。推荐的接触电流测量方法是基于电流流经人体可能产生的影响。在本标准中，通过代表人体阻抗的网络的电流测量被称为接触电流测量。这些网络不一定对动物的身体有效。具体限值的规定或含义不属于本标准的范围。 IEC TS 60479 系列提供了有关电流通过人体的影响的信息，从中可以得出限值。根据 IEC 61140，本标准适用于所有类别的设备。本标准中的测量方法不适用于：持续时间小于 1 秒的接触电流； IEC 60601-1 中定义的患者电流；频率低于 15 Hz 的交流电；电流高于为电烧伤极限选择的电流。本基本安全出版物主要供技术委员会根据 IEC 指南 104 和 ISO/IEC 指南 51 中规定的原则制定标准使用。它不适合独立于产品标准的制造商或认证机构使用。技术委员会的职责之一是，在适用的情况下，在准备其出版物时利用基本安全出版物。本基本安全出版物的要求、测试方法或测试条件仅在相关出版物中特别提及或包含时才适用。 [外文原描述]： IEC 60990:2016 defines measurement methods for d.c. or a.c. current of sinusoidal or non-sinusoidal waveform, which could flow through the human body, and current flowing through a protective conductor. The measuring methods recommended for TOUCH CURRENT are based upon the possible effects of current flowing through a human body. In this standard, measurements of current through networks representing the impedance of the human body are referred to as measurements of TOUCH CURRENT. These networks are not necessarily valid for the bodies of animals. The specification or implication of specific limit values is not within the scope of this standard. IEC TS 60479 series provides information regarding the effects of current passing through the human body from which limit values may be derived. This standard is applicable to all classes of EQUIPMENT, according to IEC 61140. The methods of measurement in this standard are not intended to be used for TOUCH CURRENTS having less than 1 s duration, patient currents as defined in IEC 60601-1, a.c. at frequencies below 15 Hz, and currents above those chosen for ELECTRIC BURN limits. This third edition cancels and replaces the second edition published in 1999. It constitutes a technical revision. The principal changes in this edition as compared with the second edition are as follows: - the effects names have been updated to reflect increased understanding of the range of effects and is in concert with present usage; - the conditions of use invoking a GRIPPABLE PART have been reduced in the application of the requirements based upon the current understanding of this effect; - the references to ISO 10012-1, which has been replaced by management standard of the same number, have been replaced with explanatory text, where needed to maintain the sense of the document; - former informative Annex H (GRIPPABLE PART) has been deleted from this update as it does not properly represent the full set of conditions under which immobilization can occur. A new informative Annex H (Analysis of frequency filtered touch current circuits measurement) has been added and the Bibliography (formerly Annex M) has been updated with additional references for completeness. This basic safety publication is primarily intended for use by technical committees in the preparation of standards in accordance with IEC Guide 104 and ISO/IEC Guide 51. It is not intended for use by manufacturers or certification bodies independent of product standards. It has the status of a Basic Safety Publication in accordance with IEC Guide 104. Key words: Touch Current, Protective Conductor Current, Current Flow