File Name: earthing practices and ie rules .zip
November 27, Comments. The main reason for doing earthing in electrical network is for the safety. When all metallic parts in electrical equipments are grounded then if the insulation inside the equipments fails there are no dangerous voltages present in the equipment case.
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If necessary, the neutral may be earthed through a suitable Impedance. TN System: There is a metallic path for Earth fault currents to flow from the Installation to the earthed point of the Source. TT System: One or more points of source of Energy directly earthed and the exposed and extraneous Conductive Parts of the Installation are connected to local earth electrodes. IT System: It has Source unearthed or earthed through a high impedance and exposed Conductive parts of the Installation are connected to local earth electrodes.
To connect the metallic conductive Parts of an Electric appliance or installations to the earth ground is called Earthing or Grounding. In other words, to connect the metallic parts of electric machinery and devices to the earth plate or earth electrode which is buried in the moisture earth through a thick conductor wire which has very low resistance for safety purpose is known as Earthing or grounding. To earth or earthing rather, means to connect the part of electrical apparatus such as metallic covering of metals, earth terminal of socket cables, stay wires that do not carry current to the earth. Earthing can be said as the connection of the neutral point of a power supply system to the earth so as to avoid or minimize danger during discharge of electrical energy. Good to know. Let me clear the confusion among earthing, grounding and bonding. Earthing and Grounding are the same terms used for earthing.
Enter your mobile number or email address below and we'll send you a link to download the free Kindle App. Then you can start reading Kindle books on your smartphone, tablet, or computer - no Kindle device required. There is a lot of misconception among practicing engineers both design and field on this topic. Study of this application guide will bring clarity to the reader on this topic. Remarks on mis-interpretation of IE rules are made. The reader will understand why different grounding methods are adopted at different voltage levels. Relationship between Grounding and Transformer Ampere Turns Balance theory is clearly brought out which is the cornerstone of grounding exercise.
Electrical Earthing or Grounding System for buildings to be carried out all in accordance with the international standards in conjunction with the local authority requirements and recommendations. Simple earthing system we provide to the domestic connections while complex systems are being used in the power stations and industries. Medium and large scale building projects require simple system for residential areas and rest requires medium complex system. In most cases earthing integrate with lightning protection system and low current systems.
Electrical wiring in the United Kingdom is commonly understood to be an electrical installation for operation by end users within domestic, commercial, industrial, and other buildings, and also in special installations and locations, such as marinas or caravan parks. Electrical wiring is ultimately regulated to ensure safety of operation, by such as the building regulations , currently legislated as the Building Regulations , which lists "controlled services" such as electric wiring that must follow specific directions and standards, and the Electricity at Work Regulations The detailed rules for end-use wiring followed for practical purposes are those of BS Requirements for Electrical Installations. IET Wiring Regulations , currently in its 18th edition, which provide the detailed descriptions referred to by legislation. UK electrical wiring standards are largely harmonised with the regulations in other European countries and the international IEC standard.
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If necessary, the neutral may be earthed through a suitable Impedance. TN System: There is a metallic path for Earth fault currents to flow from the Installation to the earthed point of the Source. TT System: One or more points of source of Energy directly earthed and the exposed and extraneous Conductive Parts of the Installation are connected to local earth electrodes. IT System: It has Source unearthed or earthed through a high impedance and exposed Conductive parts of the Installation are connected to local earth electrodes. Note: Neutral of the System earthing conductor shall not be accessible, shall be insulated where exposed.
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The Indian Electricity Rules, was made under section 37 of the Indian Electricity Act, now repealed after enactment of The Electricity Act, , but these rules themselves has been allowed to be in force till rules under section 53 of new Act are made.