ASSIGNMENT

CH -1 ELEMENTS OF ELECTRIFICATION

1) What are the factors to be considered for good illumination design?

2) State the illumination required in lux for following (a) Drawing room (b) Reading room (c) lecture hall (d) Workshop (f) Library.

3) How the testing is carried out after newly installed wiring? What are the contents of supervisor report?

4) State the different tests performed on a new electrical installation as per IS: 732 part III 1982. Draw the circuit diagram for any one test and explain how it is carried out? What should be result of a test?

CH-2 ELECTRIFICATION OF MULTISTORY BUILDINGS

1) Explain which factors to be considered while doing electrification of small residential building.

2) Explain the method for finding out following factors while estimating of wiring installation.

i) Total electrical load and no. of sub circuits

ii) Rating of main switch, distribution boards & cable.

3) State & explain the importance of safety rules as per I.E. applied to multistoried building.

4) How S.O.R. is useful in estimation of total cost of electrification?

5) What is estimation? Differentiate between approximate estimation and scientific estimation.

6) A newly constructed building having 5 floors, each floor is having 3 flats; each flat supplied with 240 volt; single phase- supply through a main switch of 16 amp/250V rating .and each flat is to be carried out 20 points wiring. This building has one lift; operated by 15 H.P., 3 phase motor; and two 3 phase electric motors of 5 H.P. capacity. This building is supplied with 3 phase, 4 wire, 415 volt supply (Assume additional data) calculate following.

i) Total electrical load on installation.

ii) Size of main switch.

iii) Size and type of main cable.

iv) No. of sub circuits of individual flats.

7) State different types of domestic wiring & differentiate between domestic and industrial wiring.

8) “It is necessary to take permission from electrical inspector before giving supply to high rise building.”-Explain. Give test report Format.

CH-3 ELECTRIFICATION OF COMPLEXES AND PUBLIC BUILDINGS

1) What are the salient features to be considered while doing industrial (Power) wiring as per I.E.R

2) A drawing hall of polytechnic college 30 mt X 15 mt size illuminated by 40 watt florescent tubes of total lumen output 5600 lumens. The tube fixtures are mounted at height of 3.5 mt. from the work place. The average illumination required is 240 lux. (a) Calculate the number of tubes required is the coefficient of utilization is 0.6 and maintenance factor 0.8. (b) Estimating the material requirements prepare cost schedule, use surface conduit wiring. Height of ceiling is 5 mt. (Assume any Suitable data as an where required)

3) A three storied hostel building has 45 rooms & each room has 5 points of wiring. Show by diagram how electrical supply is distributed starting from 3 phase supply to each room.

4) For electrification point of view state the special requirements for the following: (1) Hospitals (2) Cinema Halls (3) Hotels (4) Cultural Hall.

5) A three storied hostel building has total 30 rooms & each room has 5 points of wiring. Show by diagram how electrical supply is distributed starting from 3 phase supply to each room.

6) List types of domestic wiring & differentiate between small residential wiring and multistoried building wiring.

CH-4 DISTRIBUTION SYSTEM FOR MULTISTORIED BUILDINGS

1)Draw the circuit diagram of distribution panel with appropriate metering for a multistoried building and label each component (Assume Suitable data)

2)Draw a single line diagram from distribution board to each flat by tree or rising main system.

3)With suitable diagram explain distribution panels & bus-bar systems for high rise building.

4)State special precautions to be observed for cable laying in building for electrification & explain it.

5)An 8 storied building has 2 flats on each floor. Each flat requires 5- Fan points, 15-Light points, 8- plug points and 2 power points. One common lift is provided operated by 20 HP, 3 phase, 440volt motor. Also one 10 HP, 3 phase, 440volt motor is provided for pumping of water. Assume additional data if required. Find out: - (1) No. of total sub circuit. (2) Size of main switch of one flat. (3) Total load of building. (4) Size of main cable. (5) Size of main switching of whole building. (6) Total Load / flat. Draw a single line diagram from distribution board to each flat by tree or rising main system.

CH-5 ELECTRICAL SAFETY AND IE RULES

1) Explain fire and smoke detection system in large building complexes.

2) Draw & explain the earthing system to be used in electrical installation of building complex.

3) Explain the significance of ELCB & MCB in high rise buildings

4) Explain the use of National Building Code for safety.

5) State how earthing is carried out for residential, industrial and multistoried building as per I.E. Rules.