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EzineArticles Title *Electrical Estimate and Costing Category *Reference and Education » College University Summary The electrical estimation and costing means collecting details information of what are materials required for work and mentioning the cost of Electrical material for costing Body * ELECTRICAL ESTIMATE AND COSTING FOR PROJECT CLOSURE FULL GUIDELINES Question and Answer:- 1) What is estimate and costing? Ans:- The estimation means collecting details information of what are materials required for work and mentioning the cost of material is called estimation . 2)What are the factors to be considered for electrical estimation ? Ans: There are main major factors are Factors to be considered for Selection of Wiring Selection of wiring methods Layout of wiring Calculations of length of wire Quality of wiring material for residential & commercial installation using suitable design of illumination system Wiring diagram of individual switchboard Preparation of bill of material (numerical) Earthing Method of earthing as per IS:732-1963 Estimation of cost of installation earthing Requirement of earthing installation for substations Residential and Commercial installation of earthing Earth resistance for various installation Overhead Lines Main components Types of Supports Types of Insulators Estimation of Overhead lines Underground Cables Types of Cables Method of Laying of Cables Estimation of Underground cable installation Differences between Overhead Transmission lines and Underground cables installations Meaning of Terms using in Estimation & Costing Principle of estimation purpose of estimation & costing Approximate estimates Detailed estimates Preparation of detailed specification Standard specification book Market rate for Material & Labours Standard schedules of rate 3) Briefly describe Electrical estimate in Residential floor? Ans) This is the plan where we should calculate everything i.e., what are the materials required for the plan and make a chat of materials with costing. All dimensions are in a lot meter The following assumptions are made : The height of the meter board, distribution board from the floor level = 2 meters. Height of horizontal run and lighting fitting from floor level = 3 meters. Height of switchboard from floor level = 1.5 circuits SI.NO Location Area(meter square) Wattage (10W/m sq) No of points Types of fitting lights fans socket 01 Verandah 8 80 1×60 - - Pendent 02 Room 12 120 1×40(FL) 1×80 1×60 Pendent 1×60(IL) batten 03 Hall 16 160 2×40 1×80 1×60 Pendent 1×60 & batten 04 Kitchen 9 90 1×40 - PS=2000 Pendent 1×60 & batten 05 Passage 1.5 15 1×60 - PS=1000 Pendent 06 Bath roon 2.5 2.5 1×60 - Pendent Total load = 480w 160w 120w Total lighting circuit load = 480 + 160 + 120 = 760 watts Total heating circuit load = 3000 watts Total load of Installation = 760 + 3000 = 3760 watts No of the lighting circuit = Total lighting circuit load/800 = 760/800 = 0.95 If the total lighting circuit load exceeds 800 watts then two circuits must be provided, but here total lighting circuit load is less than 800 watts. Therefore, only one circuit is used. Hence from the Meter board, one lighting and one heating circuit are taken. Step-02 Wiring diagram for the given plan: MB - Meter Board DB - Distribution Board SB - Switch Board contains switches & sockets Step-03 : Size of the wire To calculate any size of the wire, first we should calculate load current and by using a wire table size of the wire can be calculated. Load current = Total lighting circuit load/Voltage = 760/230 = 3.30 Amps let, a factor of safety be 2(for future demands or load) Current rating = load current * 2 = 3.30 * 2 = 6.6 Amps Therefore, for lighting circuit 3/22 SWG copper wire Therefore, for lighting circuit 3/22 SWG copper wire is selected from the wire table Step-04: Keywords *electrical estimate, , circuit load, lighting circuit load, load current, total lighting circui EzineArticles.com WRITE & EDITPERFORMANCEPROFILENETWORKINGRESOURCESLIBRARYACCOUNTHELPSTORE © 2020 EzineArticles.com - All Rights Reserved Worldwide Feedback Article Preview Edit Article Submit Article HOME » Reference and Education/College University Electrical Estimate and Costing By Siddhartha Sengupta ELECTRICAL ESTIMATE AND COSTING FOR PROJECT CLOSURE FULL GUIDELINES Question and Answer:- 1) What is estimate and costing? Ans:- The estimation means collecting details information of what are materials required for work and mentioning the cost of material is called estimation . 2)What are the factors to be considered for electrical estimation? Ans: There are main major factors are Factors to be considered for Selection of Wiring Selection of wiring methods Layout of wiring Calculations of length of wire Quality of wiring material for residential & commercial installation using suitable design of illumination system Wiring diagram of individual switchboard Preparation of bill of material (numerical) Earthing Method of earthing as per IS:732-1963 Estimation of cost of installation earthing Requirement of earthing installation for substations Residential and Commercial installation of earthing Earth resistance for various installation Overhead Lines Main components Types of Supports Types of Insulators Estimation of Overhead lines Underground Cables Types of Cables Method of Laying of Cables Estimation of Underground cable installation Differences between Overhead Transmission lines and Underground cables installations Meaning of Terms using in Estimation & Costing Principle of estimation purpose of estimation & costing Approximate estimates Detailed estimates Preparation of detailed specification Standard specification book Market rate for Material & Labours Standard schedules of rate 3) Briefly describe Electrical estimate in Residential floor? Ans) This is the plan where we should calculate everything i.e., what are the materials required for the plan and make a chat of materials with costing. All dimensions are in a lotmeter The following assumptions are made: The height of the meter board, distribution board from the floor level = 2 meters. Height of horizontal run and lighting fitting from floor level = 3 meters. Height of switchboard from floor level = 1.5 circuits SI.NO Location Area(meter square) Wattage (10W/m sq) No of points Types of fitting lights fans socket 01 Verandah 8 80 1×60 - - Pendent 02 Room 12 120 1×40(FL) 1×80 1×60 Pendent 1×60(IL) batten 03 Hall 16 160 2×40 1×80 1×60 Pendent 1×60 & batten 04 Kitchen 9 90 1×40 - PS=2000 Pendent 1×60 & batten 05 Passage 1.5 15 1×60 - PS=1000 Pendent 06 Bath roon 2.5 2.5 1×60 - Pendent Total load = 480w 160w 120w Total lighting circuit load = 480 + 160 + 120 = 760 watts Total heating circuit load = 3000 watts Total load of Installation = 760 + 3000 = 3760 watts No of the lighting circuit = Total lighting circuit load/800 = 760/800 = 0.95 If the total lighting circuit load exceeds 800 watts then two circuits must be provided, but here total lighting circuit load is less than 800 watts. Therefore, only one circuit is used. Hence from the Meter board, one lighting and one heating circuit are taken. Step-02 Wiring diagram for the given plan: MB - Meter Board DB - Distribution Board SB - Switch Board contains switches & sockets Step-03: Size of the wire To calculate any size of the wire, first we should calculate load current and by using a wire table size of the wire can be calculated. Load current = Total lighting circuit load/Voltage = 760/230 = 3.30 Amps let, a factor of safety be 2(for future demands or load) Current rating = load current * 2 = 3.30 * 2 = 6.6 Amps Therefore, for lighting circuit 3/22 SWG copper wire Therefore, for lighting circuit 3/22 SWG copper wire is selected from the wire table Step-04: Article Source: http://EzineArticles.com/expert/Siddhartha_Sengupta/2814091 Edit Article Submit Article