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Showing posts from January, 2016

ELECTRICAL PANEL WIRING AND TERMINAL BOARDS CONNECTION PROCEDURE

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Guide to Electrical Control Panel Wiring and Terminal Board Connection Procedure This document provide as guide for the service provider on high voltage and medium voltage transmission line power projectfrom the employer site to ensure that all electrical equipment mounted in switch-gear, panels, kiosks, and desks, etc. must have readily accessible connections and be wired to terminal blocks for the reception of external cabling.
Of course all wiring be situated of adequate cross-sectional area to carry prospective short-circuit currents without any risk of damage to conductors, insulation or joints.

Important to consider that the selecting the wrong wire types may cause the operational problems and could render the unsafe for human and equipment. Some of the important factor of such as: ·Size of the conductor; ·Insulation of material; ·Made of; ·Whether Solid, standard or flexible etc.
Panel Wiring Cable Selection GuideAll cable for panel wiring should be of type CR or CK to BS 6231unless th…

PAINTING AND CLEANING ROUTE FOR A CONTRACT

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The Adequate Painting and Cleaning Plan for Erection Contract The requirements of this article on painting and cleaning schedules of a contract should be interpreted in accordance with the requirements and recommendations of standard BS 5493 and CP 231, CP 3012 and the paint manufacturer’s special instructions where applicable. Color selection should be in accordance with BS 1710 and BS 4800 or equivalent material standards.
The Paint Supplier SelectionImmediately following the award of a Contract, the Service provider should submit the names of the proposed paint supplier and applicator together with a quality assurance program for approval. All paints for a contract should be provided by one manufacturer and preferably should be manufactured in one country to ensure compatibility
Schedule and Service Life for Painting WorkThe painting of the plant should be carried out in accordance with the appropriate schedule. The work is generally covered by the schedules but where particular item…

SEALING AND DRUMMING PROCEDURE OF UNDERGROUND CABLE

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Underground Power Cable Sealing and Drumming Procedure under High Voltage Cable Installation Project
This document established for only on high voltage underground power transmission project’s personnel who are related with underground power cable Packaging, shipping and handling in site; to protect the cable from any damage and easy understand the right handling procedure.
Cable end sealing correctly protects the cable from damage and cable pulling in site become more easy and safe. ·Wearing cable sealing cap in both side of cable as soon as possible, protect ingress of moisture or water; ·Cable sealing cap with eye-bolt, helps to cable pulling attaching pulling string; ·Cable Sealing cap attached with metallic armor rather than copper core, helps to cable laying without damage; ·Cable sealing metallic cap for metallic sheathed cable ensure long life.
Cable drumming in correct way helps the cable shipping and handling in site becomes less damage and manage to easy.
How Sealing and Drumming t…

STAFFING DURING COMMISSIONING PHASE: EHV & HV POWER CABLE PROJECT

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Professional Staffing During Project Pre-commissioning and Commissioning During pre-commissioning the Service provider should provide all necessary supervisory and operating staff. The only involvement of the Employer’s staff will be in accordance with the training and instruction as in this specification. During the commissioning phase, the Employer’s operating staff will operate plant and equipment under the supervision of the Service provider’s supervisors. Prepare the Project for Commissioning OperationThe Service provider should have satisfied himself as to the capability of the Employer’s operators to carry out such operations as he may direct and should remain responsible for the successful performance of such operations. Throughout the whole of the Commissioning Period the Service provider should provide suitably qualified and experienced operating staff, who should instruct the Employer’s staff in the correct operating procedures. Qualified Team of Staff for CommissioningThe Ser…

TERMINALS AND TERMINAL BOARDS FOR CABLE

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Power Cable Termination and Terminal Boards Assembling ProcedureTerminal Assemblies should be of the unit form suitable for mounting on a standard assembly rail, to give the required number of ways. The units should be spring retained on the assembly fail. Each individual terminal block should have independent terminals and outgoing cabling. Terminal Screwing It should be possible to replace any unit in an assembly without dismantling adjacent units. Molding should be mechanically robust and withstand the maximum possible operating temperatures and torque which may be applied to terminal screw. All live parts should be recessed in the molding to prevent accidental contact. Terminals should be of the screw clamp type for lower current rating which compresses the conductor or termination between two plates by means of a captive terminal screw. Contact pressure of screw clamp terminations should be independent of each other. For higher current ratings bolted type terminals are permitted. C…

CIVIL WORKS OVERSEE: MATERIALS AND WORKMANSHIP

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The Overseeing Civil Works, Materials and Workmanship for Construction of Underground Cable Project This article described in brief on service provider obligation on materials and workmanship of civil work to execute an underground power transmission cable project. How See Standards and Samples All materials should be the best quality of the respective kings specified or described in the Specification and Drawings and should comply in all respects with the latest edition or amendment of the relevant British Standard except and insofar as that Standard is amended by this specification or Drawings.
What is the Tolerance Scale The Works are to be constructed to lines, levels graded and dimension set out in the Drawing and it is hardly obligation for service provider to no make any departing from these lines, levels, grade and dimensions unless authorizeagree by the Engineer.
Importance of Samples to Project Oversee Samples of materials and workmanship which is proposed to employ in the executio…

METAL CLAD BUS-BARS AND CONNECTIONS

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What Should Consider in Copper Bus-bar JointingWe can list up the major considering points for copper bus-bars jointing techniques are as below. ·Bolted Joint; ·Clamped Joint; ·Riveted Joint; ·Soldered Joint; ·Welded Joint.
There are main two reasons to bus-bar joint; to extension the bus-bars where linear joints are suitable to assemble; and to tap-off for connections where T-joints are perfect.
Two things must consider as important to bus-bar joints; joint be mechanically strong and electrically have a low resistance.
Copper bus-bar uses not any special type of joint but very familiar type of joints like bolting, clamping, riveting, soldering and welding etc.Bolted and clamped joints are little easy and possible to use at site, on the other hand riveted and soldered/welded joints are uses in factory pre-fabricated for special shape and to achieve low resistance joints.
Bolted/clamped joints are easy to install and re-installed; but riveted/soldered/welded joints are difficult and need specia…

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