IEC 61140 pdf download

IEC 61140 pdf download.Protection against electric shock – Common aspects for installations and equipment
1 Scope
This International Standard is a basic safety publication primarily intended for use by technical committees in the preparation of standards in accordance with the principles laid down in IEC Guide 1 04 and ISO/IEC Guide 51 . It is not intended to be used as a stand-alone standard. According to IEC Guide 1 04, technical committees, when preparing, amending, or revising their publications, are required to make use of any basic safety publication such as IEC 61 1 40. This International Standard applies to the protection of persons and livestock against electric shock. The intent is to give fundamental principles and requirements which are common to electrical installations, systems and equipment or necessary for their coordination, without limitations with regard to the magnitude of the voltage or current, or the type of current, and for frequencies up to 1 000 Hz. Some clauses in this standard refer to low-voltage and high-voltage systems, installations and equipment. For the purposes of this standard, low-voltage is any rated voltage up to and including 1 000 V a.c. or 1 500 V d.c.. High voltage is any rated voltage exceeding 1 000 V a.c. or 1 500 V d.c.. It should be noted that, for an efficient design and selection of protective measures, the type of voltage that may occur and its waveform needs to be considered, i.e. a.c. or d.c. voltage, sinusoidal, transient, phase controlled, superimposed d.c., as well as a possible mixture of these forms. The installations or equipment may influence the waveform of the voltage, e.g. by inverters or converters. The currents flowing under normal operating conditions and under fault conditions depend on the described voltage.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply. NOTE An index of definitions is given in Annex B. 3.1 electric shock physiological effect resulting from an electric current through a human body or livestock Note 1 to entry: Physiological effects include, for example, perception, muscular contractions and tetany, difficulty in breathing, disturbances of heart function, immobilization, cardiac arrest, breathing arrest, burns or other cellular damage. Note 2 to entry: Physiological effects resulting from EMF are not considered in this standard. [SOURCE: IEC 60050-1 95:1 998, 1 95-01 -04, modified – “through a human body or livestock” replaces “passing through a human or animal body”; addition of 2 Notes to entry] 3.1 .1 basic protection protection against electric shock under fault-free conditions [SOURCE: IEC 60050-1 95:1 998, 1 95-06-01 ] 3.1 .2 fault protection protection against electric shock under single fault conditions [SOURCE: IEC 60050-1 95:1 998/AMD1 :2001 , 1 95-06-02] 3.1 .3 additional protection protection against electric shock in addition to basic protection and/or fault protection [SOURCE:IEC 60050-826:2004, 826-1 2-07, modified – “protection against electric shock” replaces “protective measure”] 3.1 .4 single fault condition condition in which one means for protection against electric shock is defective or one fault is present which could cause a hazard Note 1 to entry: If a single fault condition results in one or more other fault conditions, all are considered as one single fault condition. 3.2 electric circuit arrangement of devices or media through which electric current can flow Note 1 to entry: See also IEC 60050-826:2004, 826-1 4-01 for electrical installations of buildings. 3.3 electrical equipment item used for such purposes as generation, conversion, transmission, distribution or utilization of electric energy, such as electric machines, transformers, switchgear and controlgear, measuring instruments, protective devices, wiring systems, current-using equipment [SOURCE: IEC 60050-826:2004, 826-1 6-01 ] 3.4 live part conductive part intended to be energized in normal conditions, including a neutral conductor or mid-point conductor, but by convention not a PEN conductor or PEM conductor or PEL conductor Note 1 to entry: This concept does not necessarily imply a risk of electric shock. [SOURCE: IEC 60050-1 95:1 998, 1 95-02-1 9, modified – “…normal conditions, including a neutral conductor or mid-point conductor” replaces “normal operation, including a neutral conductor..”]