Method of Electrical Earthing And Bonding Multicore Cables

Multicore Cable showing details of each parts

The metallic sheath and armour of multicore cables shall be bonded together and earthed. Cable earthing conductors shall be copper strip with appropriate section laid in formed cable trenches or ducts, or fixed to walls, concrete or steel work, by means of clamps or claw type cleats, appropriately secured into suitable wall plugs or tapped holes. The spacing of fixings shall not be greater than 1 m.

Method of Earthing or Grounding Of MDB, Panel Boards, Lighting And Wiring Installations

Method of Earthing or Grounding Of MDB, Panel Boards, Lighting And Wiring Installations
Main earthing bar is to be provided in main distribution room and connected to earth electrode by 2 insulated conductors (minimum 150 mm2) via testing joints. Earthing bars of main distribution boards are to be connected, by insulated earthing conductor, directly to main earthing bar at main distribution room.

Execution Method of Electrical Earthing or Grounding Installation

Execution Method of Electrical Earthing or Grounding Installation
Continuity to be ensured that complete earthing system is electrically continuous and mechanically secure. Locations of main earth bars in substations, electrical rooms, mechanical rooms, hub (Technical) rooms, etc., to be clearly identified by 100mm X 100mm white traffolyte labels, with red lettering, to Engineer's approval.

Low Voltage (LV) Power Cables In Electrical Construction Works

Low Voltage (LV) Power Cables In Electrical Construction Works
The scope of work shall cover laying, connecting, testing and commissioning of low voltage power cables complete with all cable support, cable, cable trays, clamps and joints. Cables to be purchased from who regularly engaged in the manufacturer of electrical cable and wire products of the types and ratings required, whose products have been in satisfactory use in similar service not less than 5 years. The standard of the cables shall comply with National Electrical Manufacturers Association of local standards or any other approved.

Electrical Earthing or Grounding For Metallic Fencing

Electrical Earthing or Grounding For Metallic Fencing
In the electrical point of view and as a safety measure, metallic fence shall be separately earthed unless they come within 1.8 m of any equipment or structure above the surface of the ground, which is connected to the main earthing system. If the separation of 1.8 m cannot be obtained the fence shall be bonded to the earthing system. Here is how compound fences connecting to the earthing system.

Capacitor Banks in Electrical Construction Works

Capacitor Banks In Electrical Construction Contract Works

Capacitor banks help to improve the quality of the electrical power and gives us the more efficient operation of the power system. Capacitor banks are inexpensive if we compare the benefits they deliver to overall power system and can be easily installed anywhere on the network. This specification covers the manufacture, supply, installation, testing and commissioning of 415 Volts, 3 phase, 50 HZ, capacitor banks for power factor improvement in building electrification project.

Typical Cable Laying Details For Direct Buried, Low Tension Cables

Typical Cable Laying Detail For Direct Buried, Low Tension Cables

Most Construction projects requires underground cabling system for its power supply, some times High tension system too. The architects and builders are least bothered about how this cables routed to the premises and equipment. If electrical professionals pointed out the feasibility, the aesthetics of the project would touch to the intended level. Hence, in the planning stage itself the routes and size of the power cable trench to be incorporated in the project design.

Electrical Earthing or Grounding Electrode Design for Building Construction

Electrical Earth or Ground Electrode
Earthing or Grounding Electrode for an effective and reliable electrical earthing system requires proper survey and analysis of project location, type of structures installed and electrical / electronic equipment used in the entire system. The design calculation of the earth electrode systems shall be based on the approved earth resistivity data and the system's fault currents and their duration.

Lighting Distribution Boards (LDB) In Electrical Construction Works

Lighting Distribution Boards In Electrical Construction Works
Lighting Distribution Boards are an integral and essential part of every building project and it must be designed, manufactured and installed all in accordance with the safety standards. In most of the cases it operates a layman wherein others operate dedicated or trained person. This article explains what are the basic and essential standards, parts, frame to be applied for manufacturing and installation of lighting distribution boards in a building project.

Technical Submittals of Electrical Earthing / Grounding Prior Installation

Technical Submittals Required for Electrical Earthing / Grounding
Earthing / Grounding work has to comply with the requirements of General and Technical Conditions of the Project including statutory obligations and regulations. Submittals to be approved by project consultant prior execution of the actual work. Regulations and rules of supply authority also to be considered when preparing the submittals for the local in which installation is being constructed.

Grounding or Earthing System In Electrical Construction Works

Grounding System In Electrical Construction Contract Works
The scope of work shall cover providing grounding stations, laying copper ground wires and connecting the panels, equipment, etc. to the ground grip as shown in the drawing. The ground station shall be as shown in the drawing. The ground electrode shall be minimum 10 feet long 1 inch dia steel pipe with copper weld exterior surface. The ground resistance shall be maintained with a suitable soil treatment as shown on drawings or as discussed and decided at site.

Testing and Commissioning In Electrical Construction Works

Insulation Megger Testing
At the completion of the electrical installation works, the entire installation shall be subject to the test before final placing in service under the full responsibility of the contractor. Unless Otherwise specifically called for all tests shall be carried out in conformity with IEE regulations. Contractor shall coordinate with the Client and the Supervising Engineer to get electricity from the local supply authority before starting of testing and commissioning.

Vacuum Interrupter (VI) for Vacuum Circuit Breakers (VCB) In Electrical Distribution System

Vacuum Interrupter (VI) for Vacuum Circuit Breakers (VCB)

Vacuum Interrupter (VI) are vacuum sealed-off devices incorporated in Vacuum Circuit Breakers (VCB) to cause interruption of fault currents in medium voltage electrical distribution systems. The contacts of the VI are pressed against each other under normal circuit conditions. In the event of a fault current, the VCB mechanism effects withdrawal of the movable contact from the fixed contact.

Importance of Fire Alarm System

Fire Alarm System block diagram

Fire alarm systems have become increasingly sophisticated and functionally more capable and reliable in recent years. They are designed to fulfill two general requirements: protection of property and assets and protection of life. As a result of state and local codes, the life-safety aspect of fire protection has become a major factor in the last two decades.

Fire Alarm System In Electrical Construction Works

Fire Alarm system

Fire Alarm System installation work covered by this section of the specifications includes the furnishing of all labor, equipment, materials, and performance of all operations in connection with the whole Fire Alarm System as shown on the drawings and as herein specified. The requirements of the conditions of the Contract, Supplementary Conditions and General Requirements apply to the work specified in this section.

General Requirements for Electrical Earthing or Grounding System in Building Construction

General Requirements for Electrical Earthing or Grounding System in Building Construction
Component parts of earthing system are to include the following: Earth electrode (rods, tapes etc.); Main earthing terminals or bars; Earthing conductors; Protective conductors; Equipotential bonding conductors; Electrically independent earth electrodes for special systems (clean earth); Accessories and termination fittings, bonding, welding kits and other materials

Wiring Materials And Installation Methods in Electrical Construction Works

Electrical Metallic Tubing (EMT) for electrical wiring

Electrical wiring needs expertise attention to every building projects. It directly related to the safety of human beings and utilities / equipment people handle. The scope of electrical wiring shall cover supply, installation, testing and commissioning of all conduits and accessories, wiring, switches, socket outlets, junction boxes / pull boxes, GI pull wires, ceiling roses making connections etc. Unless otherwise indicated wiring shall consist of PVC insulated copper conductor wires installed in heavy gauge steel galvanized conduits.

Pages

Subscribe to Electricveda.com RSS