ELECTRICAL ESTIMATION AND COSTING
Course Code 18EE822
CIE Marks 40
Number of Lecture Hours/Week (L:T:P) 3:0:0
SEE Marks 60
Credits 03
Exam Hours 03
Course Learning Objectives:
• To discuss the purpose of estimation and costing.• To discuss market survey, estimates, purchase enquiries, tenders, comparative statement and payment of bills and Indian electricity act and some of the rules.
• To discuss distribution of energy in a building, wiring and methods of wiring, cables used in in tern al wiring, wiring accessories, fittings and fuses.
• To discuss design of lighting points and its number, total load, sub-circuits, size of conduct or.
• To discuss different types of service mains and estimation of power ci r cuit s.
• To discuss the estimation of overhead transmission and distribution system and its components.
• To discuss main components of a substation, their graphical representation and the preparation of a single lin e diagram of a substati on.
Module-1
Principles of Estimation: Introduction to Estimation and Costing, Electrical Schedule, Catalogues, Market Survey and Source Selection, Recording of Estimates, Determination of Required Quantity of Material, Labour Conditions, Determination of Cost Material and Labour, Contingencies, Overh ead Charges, Profit, Purchase System, Purchase Enquiry and Selection of Appropriate Purchase Mode, Comparative Statement, Purchase Orders, Payment Of Bills, Tender Form, General Idea about IE Rule, Indian Electricity(IE) Act and IE Rules -29,30,45,46,47,50,51,54,55,77 and79.Module-2
Wiring: Introduction, Distribution of energy in a Building, PVC Casing and Capping, Conduit Wiring, Desirabilities of Wiring. Types of cables used in Internal Wiring, Multi Strand Cables, Voltage Grading and Specification of Cables Wiring (continued): Main Switch and Distribution Board, Conduits and its accessories and Fittings. Lighting Accessories and Fittings, Types of Fuses, Size of Fuse, Fuse Units, Earthing Conductor.Internal Wiring: General rules for wiring, Design of Lighting Points (Refer to Seventh Chapter of the Text Book), Number of Points, Determination of Total Load, Number of Sub –Circuits, Ratings Main Switch and Distribution Board and Size of Conductor. Current Density, Layout.
Module-3
Service Mains: Introduction, Types, Estimation of Underground and Overhead Service Connections. Design and Estimation of Power Circuits: Introduction, Important Considerations Regarding Motor Installation Wiring, Input Power, Input Current to Motors, Rating of Cables, Rating of Fuse, Size of Condi t, Distribution on Board Main Switch and Starter.Module-4
Estimation of Overhead Transmission and Distribution Lines: (Review of Line Supports,Conductor Materials, Size of Conductor for Overhead Transmission Line, Types of Insulat ors)[No Question Shall be Set From the Review Portion]. Cross Arms, Pole Brackets and Clamps, Guys and Stays, Conductors Configuration Spacing and Clearances, Span Lengths, Lightning Arrestors, Phase Plates, Danger Plates, Anti Climbing De vices, Bird Guards, Beads of Jumpers, Muffs, Points to be Considered at the Time of Erection of Overhead Lines, Erection of Supports, Setting of Stays, Fixing of Cross Arms, Fixing of Insulators, Conduct or Erection.
Module-4 (continued)
Estimation of Overhead Transmission and Distribution Lines (continued): Repairing and
Jointing of Conductors, Dead End Clamps, Positioning of Conductors and Attachment to Insulated or jumpers, Tee-Offs, Earthing of Transmission Lines, Guarding of Overhead Lines, Clearances of Conduct or From Ground, Spacing Between Conductors, Important Specifications.
Estimation of Overhead Transmission and Distribution Lines (continued): Repairing and
Jointing of Conductors, Dead End Clamps, Positioning of Conductors and Attachment to Insulated or jumpers, Tee-Offs, Earthing of Transmission Lines, Guarding of Overhead Lines, Clearances of Conduct or From Ground, Spacing Between Conductors, Important Specifications.
Module-5
Estimation of Substations: Main Electrical connection, Graphical Symbols for Various Types of Apparatus and Circuit Elements on Substation main Connection Diagram, Single Line Diagram of Typical Substations, Equipment for Substation, Substation Auxiliaries Supply, Substation Earthing.Click here to download Module-5
Course Outcomes: At the end of the course the student will be able to:
• Explain general principles of estimation and major applicable I.E. rules.• Discuss wiring methods, cables used, design of lighting points and sub-circuits, internal wiring,
wiring accessories, fittings, fuses, and types.
• Discuss the estimation of service mains and power circuits.
• Discuss the estimation of the overhead transmission and distribution system its components.
• Discuss types of substations, main components, and estimation of the substation.
Question paper pattern:
• The question paper will have ten questions.• Each full question is for 20 marks.
• There will be 2 full questions (with a maximum of three sub questions in one full question) from
each module.
• Each full question with sub questions will cover the contents under a module.
• Students will have to answer 5 full questions, selecting one full question from each module.
Text Book
1 A Course in Electrical Installation Estimating and Costing J. B. Gupta Katson Books, 9th Edition,2012
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