Electrical Engineering





Audio Intercom System
Audio Intercom System being used in high-rise buildings or commercial complexes, provide two way communication from entrances, gates, go-downs, industrial plants and normal doors, to an internal audio handset. It can be used to screen authorized visitors from outside entrance and useful to communicate internally between persons from one room to another room or office spaces. It can also be used to function as effective public announcement system.

 

Quality Standards for Electrical Earthing or Grounding System in Building Constructions
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. Earthing standards and methods are highly depending on the nature of the utilities and equipments installed / used at the premises. Simple earthing system we provide to the domestic connections while complex systems are being used in the power stations and industries.

 

Sample MEP Specification For Electrical Busbar Trunking
Busbar Trunking System (BBT) in electrical construction, uses to transporting electrical power to a shorter distance but many utilization point, say, within the building or a compound of facilities. Though cables can also be used in these areas, their economic impact would be high if compared to the effective Busbar Trunking System. It will help us to tap power directly from where we want it to be and make utilize to the service point.

 

Field Quality Control Method of Electrical Earthing or Grounding System Installation Construction
Earth electrode resistance, Insulation resistance of factory-built materials installed at the site and Insulation resistance of site-built materials installed at site to be considered individually for filed quality control check. It is further to be monitored earth resistance of individual earth unit and combined resistance of earth units.

 

Floor mounted electrical Sub-Main Distribution Board (SMDB)
Electrical Sub-Main Distribution Boards (SMDBs) are the integral part of Electrical LV Power distribution network in the end user premises of a medium and large scale projects. SMDB acts as a mediator between Main Distribution Board (MDB) and Final Distribution Boards (FDBs) that serves approximately 100A to 400A load range. The drawings given here shows how to install:

 

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 equipments. 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.

 

Guidelines for Installation of Emmergency Power Diesel Electrical Generating Set

We often depends Diesel Electrical Genset as emergency power system due to mains failure. As a professional, the installation of diesel electrical power generator should be as per the clients requirement and to be inline with the authoritative norms and standards.

 

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.

 

Emergency Power Diesel Generating Set In Electrical Construction Works
This article covers the manufacture, supply, installation, testing and commissioning of 415 volts, 3 ph, 4 wire, Diesel Alternator Set (Diesel Genset). The set shall be mounted on common base frame and complete in all respects including the auxiliary equipment such as battery auxiliary, lube oil pumps, filters, oil storage tank, centrifuge, etc. including piping required for interconnection between the set and the auxiliaries which are mounted separately.

 

Fire Detection And Alarm System In Electrical Construction Works
The scope of this specification covers the supply, installation, testing and commissioning of an Automatic Fire Detection and Alarm System including wiring. All materials and equipment used in the work shall be ISI approved and installed with a high degree of workmanship. The installation as a whole shall comply in all respects with ISI code of practice for Automatic Fire Alarm System (IS 2189-1976) however, contractor shall comply with the latest or superseded versions of IS/BIS to be used for the complete work.

 

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.

 

Category 6 Voice / Data cables
The Contractor shall design, supply and install outlet plates, conduits, trunking, trays, wiring, junction boxes, distribution frames, patch panels, data rack, backbone cables, etc. necessary to form a complete structured system for voice and data cabling within the buildings. Cabling / wiring shall be provided for voice system from patch panel location to each voice/data outlet. Draw wires shall be provided in conduits for future data cabling / wiring by others (if applicable). The installation shall comply with the requirements of ANSI / EIA / TIA-568-1991 as appropriate as well as Local Telecom Authority.

 

Electrical Specification for Lighting Fixtures In Building Projects
The scope of this specification covers the supply and installation of lighting fixtures applicable to internal and external places of a building. Work includes, the collection, handling, installation and commissioning of the fluorescent, incandescent, chandelier, mercury vapour lamp light fixtures.

 

Earthing
The scope of this specification covers the supply, installation and testing and earthing system of the entire installation and for lightning protection. The following standards shall be applicable, however, contractor shall comply with the latest or superseded versions of IS/BIS to be used for the complete work:

 

Electrical Power Layout Conduit Installation
The scope of this sample specification covers the supply, installation, testing and commissioning of all wiring materials for power and lighting in concealed and/or surface conduits. All wiring to lights, fans, convenience outlets, call bells, etc. will be considered on 'point rate' basis and shall include the required length of wires from sub-distribution board outlet to the ceiling roses, switches, convenience outlet sockets, bell pushes, call bells, connectors, etc. The wiring shall be carried out separately for 'lighting' and power as indicated in the drawings.

 

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 personnels. 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.

 

MV Distribution Panel Boards In Electrical Construction Works
Building projects requires MV Distribution Panel-boards for distribution of power to each utilities. A good electrical distribution network will have proper design, right components, and future load provisions. Space utilization will also be an important factor for maintenance and handling of the equipments. Here we look into what are the features required for design, manufacture, install a MV Distribution panel board including its BIS (IS) standards that serving building projects.

 

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.

 

Specification for Grounding System In Electrical Construction Contract Works
The scope of work shall cover providing grounding stations, laying copper ground wires and connecting the panels, equipments, 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.

 

Public Address System In Electrical Construction Contract
The contractor shall supply, installation, test and commission a public address system consisting of power amplifier, mixer power amplifier, microphone module, paging console, cabinet rack, conduits and wiring and all the necessary equipment required by the system shown and described on drawings, bill of quantities and hereinafter.

 

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