ELECTRICAL SYSTEM

DESIGN OF GARDEN

PROJECT AT BELHAVEN,

KOWDIAR

Presented by:

Nithya Susan Varghese

Guided by:

Prof M.K. Giridharan

Overview

Introduction

Proposed project

Connected Load

Calculation of Connected Load

Design of Distribution Board

Current Status and Work to be completed.

2

Electrical System Design

• Electrical system design is the design of electrical systems.

• Simple systems can be created by one person. Large systems require

large teams of people, simulation software and many paper and

electronic records.

• The design should assure proper functioning of the installation.

• The design should provide safety.

3

Electrical System Design For

High Rise Buildings

• High – rise buildings are buildings having 5 floors and above, or

having a height of 15m and above.

• They normally refer to occupancy for:

General offices

Commercial establishments

Hotels /Condominiums

4

Design Concept

• For all building construction the owner must first have a

concept for the new design, and then the architect or

designer can produce a set of building plans.

• An electrical design goes through several important stages

or development.

• Every electrical design has unique requirements,

depending upon the scope of the project. The project

scope is determined by the customers’ requirements and

the type of structure.

5

HIGH RISE BUILDING POWER SUPPLY

REQUIREMENTS:

1. General Lighting & Power

light for general illumination, seeing tasks, decorative features, hallways and stairways, others

power for appliances and office machines

2. Heating, Ventilation & Air-conditioning (HVAC) System

air-conditioning for temperature control

blowers and fans ventilation

heaters for humidity control

3. Transport System

elevators and escalators

conveyors, dumbwaiters, others

4. Water Pumps

potable and non-potable water supply

water sprinkle (fire suppression)

pumps / drainage

sewage ejectors

5. Communication System

PABX telephone system

Intercom

6

6. Automatic Doors

entrance and exit for pedestrians

garage and freight

7. Central Computer System

CPU and peripherals

Terminals

8. Auxiliaries

intrusion and hold-up control system

fire fighting & alarm system

background music and paging

sound reinforcement and video facilities

noise masking and acoustics, others

7

Proposed Project

• The proposed building “Garden Project” at Belhaven Road, Kowdiar is a 10 storeyed building. It includes a cellar for parking purpose, and 10 floors of which 2 floors are for commercial purpose, 1 for parking and the remaining for residential purpose. It has a total plinth area of 4948.34 sq. m.

8

Site Plan

9

Section

10

Cellar

11

Ground

12

First Floor

13

Second Floor

14

Third Floor

15

Fourth Floor

16

Fifth Floor

17

Terrace Floor

18

Mezzanine

19

Machine Room

20

Connected Load

DEFINITION :The sum of the continuous power

ratings of all load-consuming apparatus connected

to an electric power distribution system or any part

thereof.

Connected load for electricity is the maximum

amount of wattage that is allocated to a building.

Calculation of Connected Load is done by

engineers from the utility from which the

connection is taken.

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Description Area of the residential building (sq-m)

35 45 55 85 140

Light points 7 8 10 12 17

Ceiling fan 2-2 3-2 4-3 5-4 7-5

6A sockets 2 3 4 5 7

16A sockets - 1 2 3 4

Call Bell - - 1 1 1

Description Socket Outlets

6A 16A

Bed rooms 2-3 1

Living rooms 2-3 2

Kitchen 1 2

Dining room 2 1

Garage 1 1

For Refrigerator - 1

For Air Conditioner - 1

Verandah 1 for every 10 sq m -

Bathrooms 1 1 22

Min no. of socket outlets

Min no. of points to be provided on the basis of plinth area

Units of Electrical Energy Consumed

by common Domestic

Appliances/Equipment

ELECTRICAL APPLIANCES WATTAGE RATING

Incandescent Bulb 25W,60W,100W

Fluorescent Tube light (4feet) 40W

Fan 60W

Air Conditioner (1-1.5 ton) 1500-2500W

Refrigerator 100W

Mixer/Blender/Juicer 450W

Toaster 800W

Oven 450-700W

Electric kettle 1000/2000W

Iron 450/700W

Geyser(1.5-2 litre) 3000W

Vacuum Cleaner 700-750W

23

ELECTRICAL APPLIANCES WATTAGE RATING

Washing Machine 325W

Television 60-120W

Computer 120-600W

Radio 15W

Stereo System 50W

CFL 15W

24

Fifth floor

25

Electrical Notations

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Calculation of Connected Load

(Fifth Floor)

Sl

No

Room Space FL

Tube

4 feet

(40W)

CFL

light

(15W)

6A

socket

(60W)

16A

socket

(500W

)

25A

Socket

(2500

W)

Exhaust

Fan

(60W)

Ceiling

Fan

(60W)

Chandelier

(200W)

Total

CL of

room

space

1 Living Room +

Balcony 2 4 1 2 2 1 1520

2 Dining Room

+Balcony 1 4 2 2 2 1340

3 a Bedroom 1 +

Balcony 1 4 3 2 1 1 3840

b Dressing Room 1 2 1 90

c Toilet 1 2 1 1 590

4a Bedroom 2 1 4 3 2 1 1 3840

b Toilet 2 2 1 1 590

5a Bedroom 3 1 3 3 2 1 1 3825

b Toilet 3 2 1 1 590

6a Kitchen+ Work

Area 1 3 2 3 1 1 1825

b Toilet 1 1 75

7 Foyer 2 30

TOTAL=18155W 27

Distribution Board

• Total No: of light points= 66

(No. of light points= light+fan+6A socket+exhaust fan)

• No: of light circuits= 66/8 = 8.25 ~9

• Total No: of power points = 19

• No: of power circuits = 19/2 = 9.5~ 10

• Total No: of sub-circuits = 10+9 = 19

• Therefore we choose 8 way 3 phase DB which has 24 (i.e. 3x8) sub-circuits.

28

Calculation of Connected Load

(Third Floor) Sl

No

Room Space FL

Tube

4 feet

(40W)

CFL

light

(15W)

6A

socket

(60W)

16A

socket

(500W)

25A

Socket

(2500

W)

Exhaust

Fan

(60W)

Ceiling

Fan

(60W)

Chandelier

(200W)

Total

CL of

room

space

1 Living Room+ Balcony 1 10 3 1 1 2 1 3690

2 Toilet 4 3 1 168

3 Hall 1 4 6 1 1 2 1 3920

4 Family Living+Dining 1 7 3 1 1 2 3445

5 Foyer 4 60

6 Kitchen 2 2 5 3 1 1 1 4530

7 Work Area 1 2 2 1 1 750

8 Store 1 1 55

9 Serva t’s Roo 1 2 1 195

10 Serva t’s Toilet 1 1 75

11a Bedroom +Balcony 1 5 2 5 1 1 5295

b Dressing Room 1 1 75

c Toilet 2 1 1 1 650

TOTAL=22908W 29

Calculation of Connected Load

(Fourth Floor) Sl

N

o

Room Space FL

Tube

4 feet

(40W)

Bell

(60W)

CFL

light

(15W

)

6A

socket

(60W)

16A

socket

(500W

)

25A

Socket

(2500

W)

Exhaust

Fan

(60W)

Ceiling

Fan

(60W)

Chandelier

(200W)

Total

CL of

room

space

1 Family Living Room 3 1 9 1 6 1 2 1 6195

2a Bedroom1 +Balcony 1 5 1 6 1 2 5795

b Dressing Room 1 15

c Toilet 2 2 1 1090

3a Bedroom 2 1 1 6 1 2 5720

b Dressing Room 2 30

c Bathroom 2 2 1 1090

4a Bedroom 3 1 7 1 3 1 2 4325

b Dressing 3 45

c Toilet 3 2 1 1105

5a Bedroom 4 1 3 1 8 1 2 6765

b Dressing Room 2 30

c Toilet 2 2 1 1090 30

Sl

N

o

Room Space FL

Tube

4 feet

(40W)

Bell

(60W)

CFL

light

(15W)

6A

socket

(60W)

16A

socket

(500W)

25A

Socket

(2500

W)

Exhaust

Fan

(60W)

Ceiling

Fan

(60W)

Chandelier

(200W)

Total CL

of room

space

6 Yoga Room 2 4 2 2 1260

7 Internal stairs 1 15

8 Lift(10) 10000

TOTAL=34555W

31

Calculation Of Common

Connected Load

Sl.no Room Space FL light 4 ft

(40W)

CFL light

(15W)

Total connected

load

1 Parking (Second floor) 55 825

2 Lobby 24(6 floors)

360

3 Stairway 12(7 floors) 480

4 Terrace floor 12 180

5 Mezzanine 6 90

6 Machine room 4 60

7 Lift(10) 10000

8 Stretcher lift(18) 15000

8 External lights 20 300

9 Water lifting pump 5000

32

Current Status

• Connected Load of all floors (except commercial) has been calculated.

• Distribution Board of one apartment has been decided.

• Supplementary drawings were completed.

Work to be Completed

DB of commercial floors and Common CL, Cabling, Metering Panel

Design, Transformer Design, Emergency Power Supply, Earthing and

extensive electrical drawings have to be completed.

33

References

• Electrical Systems Design by M.K. Giridharan

• Electrical design estimating and costing by K.B

Raina and S.K Bhattacharya

• National Electric Code, Bureau of Indian

Standards publications, 1986.

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