In order to do the wiring design there are different types of wiring procedures based upon the different condition. After obtaining the blue prints from the architect, estimation has to be done. Here estimating defines determining the quantity for electrical accessories, conduit and wire and their costs. Total load and current is calculated. Sub circuits are divided based upon the amount of load. The wires must be specified and size of conductor according to the type of conductor used should also be mentioned. Size of cable differs in from central distribution board and in the sub circuit. Based upon the plan, the size of the wire can be calculated. All the controlling switches in power wiring shall be mounted on the metal frame of suitable design. All the sub circuit must have its own continuous earth wire. The wiring of power and light must be separated from each other from the commencement of supply itself and shall not be run on the same conduits. Supplier’s earth is sufficient for lighting loads. Separate boxes must be provided for each circuit. The wiring should be done close to the ceiling. For domestic appliances heavily insulated flexible cables are needed. Safety precautions is an important term to keep in mind. The main steps that are involved in designing and calculate the costing are as follows: 1. Collecting the layout of the building 2. Make a AUTOCAD model of the building 3. Measure the area of different portion 4. Calculate the required illumination 5. Calculate the wattage and amperage and distribute the load 6. Design the conduit model 7. Calculate the total wire needed 8. Cost calculation While performing those steps it should be remain in mind of the electrical engineer that there will be highest security, perfect, beautiful and easy to usable design and above all at a minimum cost.

1. Illumination calculation
Formula:
Required illumination=
𝐀𝐫𝐞𝐚×𝐒𝐭𝐚𝐧𝐝𝐚𝐫𝐝 𝐢𝐥𝐥𝐮𝐦𝐢𝐧𝐚𝐭𝐢𝐨𝐧
𝐃𝐞𝐩𝐫𝐢𝐜𝐢𝐚𝐭𝐢𝐨𝐧 𝐟𝐚𝐜𝐭𝐨𝐫×𝐔𝐭𝐢𝐥𝐢𝐳𝐚𝐭𝐢𝐨𝐧 𝐟𝐚𝐜𝐭𝐨𝐫
Entry:
Area=293.624 sq.
Standard illumination= 3.5 ft.-candle
Total lumen required=4500 lumen
Lobby:
Area=581 sq. ft.
Standard illumination=4 ft. candle
Total lumen required=5810 lumen
Office 1:
Area= 173.94 sq. ft.
Standard illumination= 10 ft. candle
Total lumen required= 3106 lumen
Office2:
Area= 256.025 sq. ft.
Standard illumination= 10 ft. candle
Total lumen required= 4575 lumen
Multipurpose hall:
Area= 2544.22 sq. ft.
Standard illumination= 10 ft. candle
Total lumen required= 53212.9 lumen

2. Pavement:
Area= 2614.1 sq. ft.
Standard illumination= 2.5 ft. candle
Total lumen required= 10211.32 lumen
Dinning Space:
Area= 546.42 sq. ft.
Standard illumination= 10 ft. candle
Total lumen required= 11358.75 lumen
Dinning space basin cabinet:
Area= 28.2 sq. ft.
Standard illumination= 5 ft. candle
Total lumen required= 358.75 lumen
Open space:
Area= 150 sq. ft.
Standard illumination= 5 ft. candle
Total lumen required= 1562.5 lumen
Corridor:
Area= 348.42 sq. ft.
Standard illumination= 5 ft. candle
Total lumen required= 3629.4 lumen
Pantry:
Area= 95.63 sq. ft.
Standard illumination= 5 ft. candle
Total lumen required= 853.84 lumen

3. Single Bed 1:
Area= 98.4 sq. ft.
Standard illumination= 10 ft. candle
Total lumen required= 1537.5 lumen
Single Bed 2:
Area= 122.52 sq. ft.
Standard illumination= 10 ft. candle
Total lumen required= 1537.5 lumen
Kitchen:
Area= 217.82 sq. ft.
Standard illumination= 20 ft. candle
Total lumen required= 9075 lumen
Pass way:
Area= 174.695 sq. ft.
Standard illumination= 5 ft. candle
Total lumen required= 1819.74 lumen
Dressing room (Gents):
Area= 64.02 sq. ft.
Standard illumination= 5 ft. candle
Total lumen required= 666.875 lumen
Toilet-1(Gents):
Area= 22.64 sq. ft.
Standard illumination= 5 ft. candle
Total lumen required= 283 lumen

4. Toilet-2(Gents):
Area= 22.64 sq. ft.
Standard illumination= 5 ft. candle
Total lumen required= 283 lumen
Dressing room (Ladies):
Area= 64.02 sq. ft.
Standard illumination= 5 ft. candle
Total lumen required= 666.875 lumen
Toilet-1(Ladies):
Area= 21.32 sq. ft.
Standard illumination= 5 ft. candle
Total lumen required= 266.5 lumen
Toilet-2(Ladies):
Area= 21.32 sq. ft.
Standard illumination= 5 ft. candle
Total lumen required= 266.5 lumen
Toilet:
Area= 32.5 sq. ft.
Standard illumination= 5 ft. candle
Total lumen required= 406.25 lumen
Store room:
Area= 72.45 sq. ft.
Standard illumination= 5 ft. candle
Total lumen required= 754.68 lumen

5. Circuit current & power calculation
Distribution board 1
Circuit: (SB-1)
Sl. No Specification Number of points Wattage per unit Wattage
1 Down light 3 25 75
2. Lobby Down light 4 25 100
3 Corridor Down
light
1 20 20
4. 2 pin socket 1 100 100
Total 295
Max current=1.23 A
Circuit: (SB-5)
Max current: 3.75A
Circuit: (SB-6)
Max current: 4.02A
Circuit: (SB-7)
Sl. no Specification Number of points Wattage per unit Wattage
1. Tube light 6 40 240
2. fan 6 60 360
3. 2 pin socket 1 100 100
Total 700
Max current: 2.9A
Sl. no Specification Number of points Wattage per unit Wattage
1. Tube light 6 40 240
2. Fan 6 60 360
3. 3 pin 2 100 200
4. 2 pin 1 100 100
5. Wall bracket 1 65 65
Total 960
Sl no Specification Number of points Wattage per unit Wattage
1. Tube light 6 40 240
2. Fan 6 60 360
3. 3 pin socket 1 100 100
4. 2 pin socket 1 100 100
Total 800

6. Circuit: (SB-2):
Sl. no Specification Number of points Wattage per unit Wattage
1. Tube light 1 40 40
2. Fan 1 60 60
3. 2pin socket 1 100 100
4. 3pin socket 1 100 100
Total 300
Max current=1.25A
Circuit: (SB-3):
Sl. no Specification Number of points Wattage per unit Wattage
1 Tube light 1 40 40
2 Wall bracket 1 25 25
3. Fan 2 60 120
4. 3pin socket 2 100 200
5. 2pin socket 1 100 100
Total 485
Max current= 2.02A
Circuit: (SB-4):
Sl. no Specification Number of points Wattage per unit Wattage
1 Down light 1 25 25
2 2pin socket 1 100 100
Total 125
Max current=0.5A
Circuit: (SB-8)
Sl. no Specification Number of points Wattage per unit Wattage
1 Wall bracket 1 25 25
Total 25
Max current=0.11A
Circuit: (SB-9)
Sl. no Specification Number of points Wattage per unit Wattage
1 Wall bracket 1 25 25
2 Down light 1 15 15
3 Fan 1 60 60
4 3 pin socket 1 100 100
5 2 pin socket 1 100 100
Total 300
Max Current = 1.25A

7. Circuit: (SB-10)
Sl. no Specification Number of points Wattage per unit Wattage
1 Air conditioner 1 6000 6000
Total 6000
Max current=25A
Total current=41.34A
Distribution Board 2
Circuit: (SB-11)
Sl. no Specification Number of
points
Wattage per
unit
Wattage Sl. no
1 Tube light 1 40 40 0.16
2 Down light 2 65 130
3 Fan 4 60 240
4 3 pin socket 2 100 200
5 2 pin socket 1 100 100
Total 710
Max Current= 2.9A
Circuit: (SB-12)
Sl. no Specification Number of points Wattage per unit Wattage
1 Down light 1 9 9
2 Wall bracket 1 65 65
Total 74
Max Current = 0.31A
Circuit: (SB-13)
Sl. no Specification Number of points Wattage per unit Wattage
1 Down light 1 9 9
2 Wall Bracket 2 5 10
3 2 pin socket 1 100 100
Total 119
Max current = 0.5A
Circuit: (SB-14)
Sl. no Specification Number of points Wattage per unit Wattage
1 Down light 1 9 9
2 Wall Bracket 2 5 10
3 2 pin socket 1 100 100
Total 119
Max current = 0.5A

8. Circuit: (SB-15)
Sl. no Specification Number of points Wattage per unit Wattage
1 Wall bracket 2 65 130
2 Fan 1 60 60
3 Exhaust Fan 1 100 100
4 3pin socket 2 100 200
5 2 pin socket 1 100 100
Total 590
Max Current: 2.45A
Circuit: (SB-16)
Sl. no Specification Number of points Wattage per unit Wattage
1 Wall Bracket 1 15 15
2 Fan 1 60 60
3 3 pin socket 1 100 100
4 2 pin socket 1 100 100
Total 275
Max Current: 1.2A
Circuit: (SB-17)
Sl. no Specification Number of points Wattage per unit Wattage
1 Wall Bracket 1 15 15
2 Fan 1 60 60
3 3 pin socket 1 100 100
4 2pin socket 1 100 100
Total 275
Max Current: 1.15A
Circuit: (SB-18)
Sl. no Specification Number of points Wattage per unit Wattage
1 Wall Bracket 1 20 20
2 Fan 1 60 60
3 2 pin socket 1 100 100
Total 180
Max Current: 0.75A
Circuit: (SB-19)
Sl. no Specification Number of points Wattage per unit Wattage
1 Wall Bracket 1 5 5
2 Wall Bracket 1 20 20
3 Fan 1 60 60
4 2 pin socket 1 100 100
5 3 pin socket 1 100 100
Total 285
Max Current: 1.18A

9. Circuit: (SB-20)
Sl. no Specification Number of points Wattage per unit Wattage
1 Wall bracket 1 30 30
2 Fan 1 60 60
3 3 pin socket 1 100 100
4 2 pin socket 1 100 100
Total 290
Max Current = 1.2A
Circuit: (SB-21)
Sl. no Specification Number of points Wattage per unit Wattage
1 Wall bracket 1 25 25
2 Fan 1 60 60
3 3 pin socket 1 100 100
4 2 pin socket 1 100 100
Total 285
Max Current = 1.2A
Total current=13.07A
Summary table for power circuit
Sl. no description Amperage Total
Power circuit
1
Power circuit 2 (main
board to sub main 1)
41.34
54.41
Power circuit 3 (main
board to sub main 2)
13.07
Power circuit
2
Power circuit 4 1.23
41.34
Power circuit 5 1.25
Power circuit 6 2.02
Power circuit 7 .5
Power circuit 8 3.75
Power circuit 9 4.02
Power circuit 10 2.9
Power circuit 11 0.11
Power circuit 12 1.25
Power circuit 13 25
Power circuit
3
Power circuit 14 2.9
13.07
Power circuit 15 0.31
Power circuit 16 0.5
Power circuit 17 0.5
Power circuit 18 0.45
Power circuit 19 1.2
Power circuit 20 1.15
Power circuit 21 0.75
Power circuit 22 1.18
Power circuit 23 1.2
Power circuit 24 1.2

11. Conduit Calculation
From Conduit Layout we can see that, there are 21 (Twenty One) circuits in total.
Specification as follows:
 The Height of the Light Bracket from the Floor Level = 8 Feet.
 The Height of the Switch from the Floor Level = 5 Feet.
 The Height of the 3-pin Switch Board from the Floor Level = 2 Feet.
 The Height of the Ceiling Fan from the Floor Level = 10 Feet.
Main Board:
1. Main Board to Sub Main 1 = 4 ft.
2. Main Board to Sub Main 2 = 38.167 ft.
Sub Main Board:
1. Sub Main 1 to SB-1= 35 ft.
2. Sub Main 1 to SB-2= 35.5 ft.
3. Sub Main 1 to SB-3= 25 ft.
4. Sub Main 1 to SB-4= 24.5 ft.
5. Sub Main 1 to SB-5= 41.58 ft.
6. Sub Main 1 to SB-6= 53.58 ft.
7. Sub Main 1 to SB-7= 65.58 ft.
8. Sub Main 1 to SB-8= 13 ft.
9. Sub Main 1 to SB-9= 13.08 ft.
10. Sub Main 1 to SB-10= 86.58 ft.
11. Sub Main 2 to SB-11=36ft
12. SB-11 to SB-12= 23 ft.
13. Sub Main 2 to SB-13= 22 ft.
14. Sub Main 2 to SB-14= 22 ft.
15. Sub Main 2 to SB-15= 27.58 ft.
16. Sub Main 2 to SB-16= 24 ft.
17. Sub Main 2 to SB-17= 13.33 ft.
18. Sub Main 2 to SB-18= 25 ft.
19. Sub Main 2 to SB-19= 29 ft.
20. Sub Main 2 to SB-20= 30 ft.
21. Sub Main 2 to SB-21= 27 ft.

12. Table for SB wise conduit
Sl. no Description Distance in ft.
1. SB-1 103.25
2. SB-2 33.167
3. SB-3 45.08
4. SB-4 8.416
5. SB-5 132
6. SB-6 120
7. SB-7 119
8. SB-8 5
9. SB-9 29.33
10. SB-10 5
11. SB-11 97.58
12. SB-12 20.84
13. SB-13 22
14. SB-14 22
15. SB-15 27.58
16. SB-16 24
17. SB-17 13.33
18. SB-18 25
19. SB-19 29
20. SB-20 30
21. SB-21 27
total 938.573

13. Summary Table for Conduit calculation
Serial no. Description Distance in Feet Total
1 Main Board to Sub Main 1 4
42.167
Main Board to Sub Main 2 38.167
2
Sub main 1
to
SB-1
293.4
449.31
SB-2
SB-3
SB-4
SB-5
SB-6
SB-7
SB-8
SB-9
SB-10
SB-11
Sub main 2
to
SB-12
155.91
SB-13
SB-14
SB-15
SB-16
SB-17
SB-18
SB-19
SB-20
SB-21
3 Switch board 938.573 938.573
total 1430.05
The Length of Total Conduit = 1430.05 ft.
Considering 10% wastage,
The Length of Total Conduit = 1573.055 ft.

14. Wire calculation
Sl. no
Board
specification
Distance in
feet
Cost per unit Cost
1 SB-1 1/1.40 mm 182 6.1874 1126.107
2 SB-2 1/1.40 mm 51.5 6.1874 318.6511
3 SB-3 1/1.40 mm 146.84 6.1874 908.5578
4 SB-4 1/1.40 mm 8.42 6.1874 52.09791
5 SB-5 1/1.40 mm 383.5 6.1874 2372.868
6 SB-6 1/1.40 mm 352 6.1874 2177.965
7 SB-7 1/1.40 mm 309 6.1874 1911.907
8 SB-8 1/1.40 mm 5 6.1874 30.937
9 SB-9 1/1.40 mm 29.33 6.1874 181.4764
10 SB-10 1/3.55mm 86.58 23.37 2023.375
11 SB-11 1/1.40 mm 211.16 6.1874 1306.531
12 SB-12 1/1.40 mm 23.84 6.1874 147.5076
13 SB-13 1/1.40 mm 16.84 6.1874 104.1958
14 SB-14 1/1.40 mm 16.84 6.1874 104.1958
15 SB-15 1/1.40 mm 83.94 6.1874 519.3704
16 SB-16 1/1.40 mm 18 6.1874 111.3732
17 SB-17 1/1.40 mm 33 6.1874 204.1842
18 SB-18 1/1.40 mm 13.94 6.1874 86.25236
19 SB-19 1/1.40 mm 34.416 6.1874 212.9456
20 SB-20 1/1.40 mm 38 6.1874 235.1212
21 SB-21 1/1.40 mm 20.84 6.1874 128.9454
22.
Main board
to sub main
1
7/1.70 mm 8 52.169 417.352
23
Main board
to sub main
2
1/1.80 mm 76.32 9.43 359.8488
Total 2149.306 15041.76
Total neutral wire required=1235.16 ft.
Cost of neutral wire (1/1.40mm)=1235.16×6.1874=7642.42TK
Summary table for wire cost
Specification Required length Required length
with 10% wastage
Cost per unit cost
1/1.40 mm 3213.566 3534.9226 6.1874 21871.98
1/3.55 mm 86.58 95.238 23.37 2225.712
7/1.70 mm 8 8.8 52.169 459.087
1/1.80 mm 76.32 83.96 9.43 791.7428
Total 2534.52186

16. Cost calculation
Wire and conduit cost
Item Specification Total unit(ft.) Cost (per ft.) Cost (TK)
Wire
(PVC insulated
and PVC
sheathed)
1/1.40 mm 3534.9226 6.1874 21871.98
1/3.55 mm 95.238 23.37 2225.7
7/1.70 mm 8.8 52.169 459.0872
1/1.80 mm 83.96 9.43 791.7428
Conduit 1573.055 10.49 16501.346
Total 41849.86
Accessories cost
Sl. no Material used Quantity Rate(Tk/piece) Cost
1. Tee 30 6 180
2. Elbow 46 3 138
3. Circular box 15 6 90
4. Junction box 10 6 60
5. Surface
mounting plastic
box
21 145 3045
6. Lamp holder 32 55 1760
7. Tube stand 21 150 3150
8. Switch board 21 198 4158
9. Switch 102 35 3570
10. Fuse 21 35 735
11. 2 pin Socket(6A) 21 35 735
12. 3 pin
socket(6/16A)
16 175 2800
13. Screw 388 0.5 194
14. Distribution
board
2 800 1600
15. Fan regulator(%
steps)
33 580 19140
16. Mini circuit
breaker
11 260 2860
17. Ceiling rose 57 35 1995
18. Fire alarm 1 1200 1200
19. Indicator lamp 21 80 1680
20. Rubber Tape 12 18 216
21. Royal plug 388 .25 97
Total 46703

17. Labor cost
Total no. of load and plug point=102
Labor cost=110 TK/load and plug point
So, total labor cost=110×102= 11220 TK.
Summary of cost calculation
Cost specification Cost(TK)
Wire and conduit cost 41849.86
Accessories cost 46703
Labor cost 11220
Total Cost 99772.86
The total cost for “KUET GUEST HOUSE – Ground floor” wiring is 99,775TK.

18. SB
SB
LOADDESIGNOFKUETGUESTHOUSECUM
CLUBBUILDING-GROUNNDFLOOR
FLUROSCENT
TUBE
EXHAUSTFAN
SURFACE
MOUNTINGLIGHT
MAINDISTRIBUTION
BOARD
SUBDISTRIBUTION
BOARD
AIRCONDITIONER
UNIT
3PIN
SOCKET
SWITCH
BOARD
CEILING
FAN
WALL
BRACKET
E
F
MDB
SDB
A
C
P
SB
PAVEMENT
P
SB
A
C
P
SBPSB
E
F
P
P
P
SB
SB
P
SDB
SB
SB
SB
SB
SB
SB
MDB
13'
P
P
SB
P
P
P
P
P
P
SDB
SBSB
SB
SB
SB
SBP