Electrical Installation





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.

 

External or Exterior lighting
Installation Methods of External, Exterior and Outdoor Lighting System includes lighting equipments luminaires, control gears, panel boards, poles, brackets, cabling, and allied minor civil works. All installations are to be carried out under strict supervision of qualified supervisors and engineers. If installation required heavy vehicles, extreme care has to be taken for preventing damages of lighting equipments, control gears and poles.

 

Standard Commercial Products for External, Exterior and Outdoor Lighting System
Standard Commercial Products for External, Exterior and Outdoor Lighting System to be chosen as per the design requirement specified in the project documents including recommended and approved list of manufacturers.

 

Quality Assurance and Standards for External / Exterior / Outdoor Lighting System
Quality Assurance and Standards for External, Exterior and Outdoor Lighting System to be designed, installed and tested all in accordance with the recommendations of IEC, CISPR and Local Authority.

 

Submittals for External, Exterior and Outdoor Lighting System
Submittals for External, Exterior and Outdoor Lighting System consists equipment data, compliance statements, shop drawings or construction drawings, samples, product certificates, field test reports, maintenance data and as-built (record) drawings.

 

External, Exterior and Outdoor Lighting System Construction
External, Exterior and Outdoor Lighting System includes lighting units with luminaires, lamps, ballasts, poles / support structures, and accessories and related power distribution and control, protective earthing and related builder's work including column foundations, cable pits, cable trenches and ductwork.

 

The Contractor shall carry out an earth resistivity survey on each site and report in writing to the Engineer in accordance with the approved program. The report shall detail the methods and instruments used and the results of the surveys. Based on the results the Contractor shall include in the report his proposals for the resistivities to be used in the design of the earthing system.

 

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.

 

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 Detail For Cable Tray Installation And Support System
Below drawing shows how to install cable tray and its support system. This cable tray support system drawing has Isometric view and cross-sectional view. Following are the steps to be done for laying cables on wall mounted cable tray: Install cable tray support using a pre-fabricated flange or GI channel. The size, length and intervals of the support to be as per the specification, standards, number of cables, and size of the cable.

 

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.

 

Typical Mounting Detail Of Fire Alarm Break Glass Manual Call Point
These drawings show how to install Fire Alarm Break Glass (BG) or Manual Call Point (MCP) on walls. It has to be mounted on back box installed in the wall. This box (embedded or exposed as specified in the concerned section of the specification) has to be connected through GI / PVC conduit that will have the Firetuff or equivalent cable to be looped for other detectors.

 

Typical Mounting Detail Of Fire Alarm Detectors
These typical drawings show how to install smoke detectors and heat detectors used in Fire Alarm system on false ceiling. The installation shall be as per the relevant section in the contract specification and drawing has the following major points: Smoke detector mounted on false ceiling with the help of loop in box; Firetuff or equivalent cable run under the RCC slab clipped to the soffit; Cable size shall be 2 core 1.5 sq. mm copper; Cable has to be looped to the detector and tied as shown in the drawing.

 

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. Safety, security, convenience, future expansions etc are to be considered and co-ordinated before start detailing of the genset's installation. The generator should be as close to the main change-over board as possible. In cases like Textile Mills, where there is fear of smoke affecting the quality of the yarn etc., generators may be located away from the Plant / Department.

 

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 equipments 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.

 

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.

 

MATV System - Master TV Antenna System
Master Antenna Television or MATV means many TV connection outlets from one Master antenna control system. Usually high-rise apartment houses, hotels, schools and cluster based residential area utilizes this kind of TV distribution network. It may or may not include FM radio so that one outlet can receive both TV and FM reception. The scope of this section covers the design, supply, installation, testing and commissioning of Master Antenna TV System, for the reception and distribution of television broadcast signals.

 

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.

 

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