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Electrical wiring, estimating and costing A knowledge of electrical fundamentals is assumed (dealt within the first volume of this book) and Chapter 1 - meiriseamamo.ga annual cost books, and estimating software. Visit our Website: Rev. ed. of: Estimating electrical construction / by Edward J. Tyler. I. Tyler, Edward J. Estimating electrical Also on the CD is the entire book in PDF format, with easy. Electrical Design, Estimating and Costing. 10EE Lectures/week: Course Instructor(s): Saranya. S. Course duration: 27 Jan., – 23 May Class.
Separate lighting circuits be utilized for all external lightings of steps, walkways, porch, car park terrace etc.
Wiring layout: Prepare building plan on a suitable scale and mark electrical points, switch boards, main board, meter board, distribution board etc. The path of wiring showing connection to each point is marked by a little thick line. Calculation of total connected load: The total connected load and hence the total current is calculated for deciding the cable size, rating of main switch board and distribution board.
Selection of Main Switch: Once the connected load is calculated, the main switch can be conveniently selected from the available standard switch list.
Selection of Main Distribution Board: Numbers of sub-circuits are decided based on the total connected load or total number of points. Calculation of length of conduit: To avoid duplicity in calculating the length of conduit pipe, this may be calculated in three stages. Calculation of length of phase wire and neutral wire: The phase wire and neutral wire is calculated sub-circuit wise. Calculation of length of earth wire: The earth wire is run along the conduit.
The calculations are carried out in length but it is converted in to weight while preparing material table. Preparing Material Table: The material table should be prepared with complete specification of each item. Size of conductors Two cables dc or Single Three or four cables phase ac balanced three phase ac Normal No.
Current Approx. One of them is a sub-circuit for 15 a socket. Draw the single line diagram showing cutout, meter, main switch, main distribution board and other equipment.
Make your own assumptions for number of electrical points in each sub-circuit and find out the rating of main switch and distribution board. Assume the height of ceiling as 3. As the total connected load is 2.
PVC insulated copper wire of 1. Lump sum. Power distribution in an industry The power distribution in an industry has different levels.
As per IS the maximum number of ways is limited to Hence 63A DB is 2 ways or 4 ways. But in some case this is avoided if the switch board supplying to the DB is within 3m from the DB. In any system, all the connected loads will not be put on simultaneously.
This reduces the maximum demand from simply computing by adding all connected loads. For spare outlets, an average of other outlets can be assumed.
Instead of furnishing the DF, a usual practice is specifying MD. A commonly accepted and safe value of DF is 1. Corresponding maximum current is 30 x 1. This current is the continuous maximum current.
Starting current of DOL starting motor is 2. So the MD calculation in the above case is as follows:.
A Course in Electrical Installation Estimating and Costing
It is necessary that the feeder protective fuse should not blow off before the motor protective fuse in the DB. This is achieved by proper grading between the fuses. For achieving grading the ratio between major and minor fuses shall be 2: Also major fuse rating should match with the cable selection. Unlike DBs, switch boards are specified by its total current carrying capacity or incomer current rating. Where as in DBs current rating of the outlet is the specified rating.
If the number of loads is more, SSB is required, which is installed almost at the load centers. Hence the incomer switch and fuse shall have a rating of A is used. The incomer cable is also rated for A. Considering all these, a practical and most economical selection is A incomer.
Here maximum fuse rating is A and grading is automatically satisfied. If DF is not clearly known, the total ampacity of outlet feeders shall not be more than two times the ampacity of the incomer feeder.
But the switch may be A, since above A, only A switch is available.
Some manufactures makes A and A also. One of the outlet switches is rated to A. But the scheme is correct. Though the switch is rated to A, the fuse is only A, which will grade with the incomer A. But there is lower limit for outlet switch rating. There 2 is no upper limit for switch rating except that is imposed by economic consideration.
There is no lower limit for fuse rating other than availability and mounting possibility. Foundation mounted For transformers above kVA and voltage of 33 kV and above. This is for maintaining the minimum sectional clearance of m at 11 kV.
It is the clearance between the operating rode of the AB switch and the jumpers of 11 kV down conductors. Substation building is constructed for installing transformer, HT and LT panel etc. Room size should be sufficient, so as to give adequate clearance between wall and various equipments. Suitable ventilation for entry of fresh air at the bottom of transformer room and exit of hot air at top on opposite sides are necessary.
The installation of transformer should that the cable boxes are on the sides and not facing the door. The OH line terminates on a DP structure outside the indoor substation.
CT PT unit is installed for connecting metering device. Supply to HT side of transformer is brought through UG cable. Both sides of the transformer are protected by suitable capacity CB. Adequate fire fitting equipment shall be provided at easily accessible positions.
Electrical Engineering Group Fourth Electrical Estimation & Costing
Danger notice board should be provided on the HV and MV equipments. Electrical Estimation Uploaded by shefinbasheer. Flag for inappropriate content. Related titles. Electrical Wiring, Estimation, Costing and Contracting full syllaus as per the gtu. Residential Commercial and Industry Electrical System. Jump to Page. Search inside document. Description Area of the main dwelling unit in m2 35 45 55 85 1 Light point 7 8 10 12 17 2 Ceiling fans 2 points — 2 fans 3 5 A socket outlet 2 3 4 5 7 4 15 A socket outlet - 1 2 3 4 5 Call - bell - - 1 1 1 8.
Load in sub-circuit No. Wiring layout Assumption: Examples have generally been taken from practical situations. Indeed, students will find this book useful not only for passing examinations but even more during their professional career.
About the Author K.
Earlier he had worked as engineer and manager in the industry in India and in U. He has been in technical education administration and management for many years.
At Technical Teachers Training Institute, Chandigarh, Professor Raina has made major contribution in the fields of Curriculum Development, technical teacher training and development of teaching-learning materials.
He has written a large number of technical papers. He had his practical training in industry in Netherlands.
Bhattacharya obtained specialized knowledge in the areas of Training and Development, Curriculum Design, Educational Technology and Educational Planning and Management in India and abroad. He has taught Electrical Engineering subjects at B. Tech and M. Tech levels for nearly 40 years.Substation building is constructed for installing transformer, HT and LT panel etc. The total connected load and hence the total current is calculated for deciding the cable size, rating of main switch board and distribution board.
The load of such circuit shall be restricted to Watts. Wiring Installations A major portion of the fixed installation design in a building relates to wiring installation. There is no lower limit for fuse rating other than availability and mounting possibility. Adequate fire fitting equipment shall be provided at easily accessible positions.
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