The International Electrotechnical Commission defines low voltage as any voltage in the range 50–1000 V AC or 120–1500 V DCĨ IEC Voltage Standard and Recommendationĭefinition of Low Voltage : Where two voltages are given below separated by “/”, the first is the root-mean-square voltage between a phase and the neutral connector, whereas the second is the corresponding root-mean-square voltage between two phases.
#Building electrical installation design code#
The United States 2005 National Electrical Code (NEC) defines low voltage as any voltage under 600 V British Standard BS 7671:2008 defines low voltage as 50–1000 V AC or 120–1500 V ripple-free DC between conductors 50–600 V AC or 120–900 V ripple-free DC between conductors and Earth. "Low voltage" is characterised by carrying a substantial risk of electric shock, but only a minor risk of electric arcs through air.
The International Electrotechnical Commission defines high voltage circuits as those with more than 1000 V for alternating current and at least 1500 V for direct current.ħ IEC Voltage Standard and Recommendationĭefinition of Low Voltage : Low voltage is an electrical engineering term that broadly identifies safety considerations of an electricity supply system based on the voltage used. British Standard BS 7671:2008 defines high voltage as any voltage difference between conductors that is higher than 1000 V AC or 1500 V ripple-free DC, or any voltage difference between a conductor and Earth that is higher than 600 V AC or 900 V ripple-free DC. This is a classification based on the design of apparatus and insulation.Ħ IEC Voltage Standard and Recommendationĭefinition of High Voltage : In the United State 2005 National Electrical Code (NEC), high voltage is any voltage over 600 V. In electric power transmission engineering, high voltage is usually considered any voltage over approximately 35,000 volts. The definitions may refer either to the voltage between two conductors of a system, or between any conductor and ground. Two factors considered in the classification of a "high voltage" are the possibility of causing a spark in air, and the danger of electric shock by contact or proximity. International Standard IEC defines a set of standard voltages for use in low voltage and high voltage AC electricity supply systems.ĥ IEC Voltage Standard and Recommendationĭefinition of High Voltage : The numerical definition of high voltage depends on the context of the discussion. The numbers of older IEC standards were converted in 1997 by adding 60000, for example IEC 27 became IECĤ IEC Voltage Standard and Recommendation IEC standards have numbers in the range 60000–79999 and their titles take a form such as IEC : Voltage standard.
Today, the IEC is the world's leading international organization in its field, and its standards are adopted as national standards by its members. IEC standards cover a vast range of technologies from power generation, transmission and distribution to home appliances and office equipment, semiconductors, fibre optics, batteries, solar energy, nanotechnology and marine energy. The International Electrotechnical Commission (IEC) is a not-for-profit, non-governmental international standards organization that prepares and publishes International Standards for all electrical, electronic and related technologies. 2 Chapter 1: Introduction Electrical Installation Designĭefine the IEC voltage standard and recommendations Define and explain TNB supply schemes Define and explain types of supply applicationģ IEC Voltage Standard and Recommendation
0 kommentar(er)
