Electrical service design

1. 1
Slides on
Drawing Lecture-1
Demonstration on drawing
‘Fittings and Fixture layouts’,
‘Conduit layouts’ and
‘Switchboard connection diagrams’
of simple architectural structures.
Uttara University

2. 2
Electrical Design of a Civil Layout: Steps to be followed (0)
Civil Layout:
The input layout to the
Electrical Engineer to
perform Electrical
Design.
Door

3. 3
Electrical Design of a Civil Layout: Steps to be followed (1)
Fittings &
Fixture Layout:
Demonstration of exact
location for different
fixtures to be used.
1
F1
C1
TS1
- -
TV1
F2
A4
2
A2
A1
A3
SS3
SS1
SS2
Let’s find out from the symbol
sheet what different symbols
represent and write it in your
sheet

4. 4
Electrical Design of a Civil Layout: Steps to be followed (2)
Conduit Layout:
Demonstration &
optimization of the
electrical connectivity
between source
of energy and loads.
1
2
FL L
S
S
F
LS
L
S
- -
L
C1
C2
C1
C23C1
C2
C1
C2
C4

5. 5
Electrical Design of a Civil Layout: Steps to be followed (3)
Switchboard Connection
Diagram:
Demonstration of
detailed connections
between each and
every loads under
a particular switchboard.
SS1
SB 1
A2A1 F1
R
C1TS1SS2 A4
2x1.5mm2
A3 F2
R
SS3
SB 2
2x2.5mm2

6. 6
Electrical Design of a Civil Layout: Steps to be followed (4)
Distribution Board
Connection Diagram:
Demonstration of detailed
connection between main
source of energy and
different switchboards with
proper safety equipments.
)
) ) )
SB 1 SB 2 SB 3
10 15 10
40

7. 7
 Exact location (3D information) for different Fixtures are
demonstrated.
 The input information is the ‘Purpose of use’ of a particular area in
civil layout (i.e. whether it’s a bedroom or a kitchen).
 Sufficient amount of lighting, cooling and connectivity for external
loads (i.e. 2/3 pin sockets) need to be provided.
 Location of the switchboard is an important issue as well.
 Keep the switch close to the entrance when people stay inside the
room
 For store and others you may keep it outside.
Fittings & Fixture Layout

8. 8
 The target is to provide an optimum design from both economic and
electrical viewpoint
 There are many scopes to improve this, so try to be innovative.
 Calculate all the loads for the fixtures and find suitable wire to be
used.
 Choose appropriate conduit from tables.
 Always remember that wires are more expensive than conduits. So the
layout should focus more to optimize use of wires.
 Try to avoid coarse wires if possible.
Conduit Layout

9. 9
 Demonstration of each and every switchboard with
connectivity to different loads through proper switching
methods.
 Explaining which outlet is governed by which
switchboard.
 Representation of exact wire size and numbers.
 Representation of safety equipments (i.e. fuses & circuit
breakers ) with proper ratings.
Switchboard Connection Diagram

10. 10
 Demonstration of each and every switchboard with connectivity to the
main Distribution Board.
 It’s not necessary to draw conduits to each switchboard. In large
designs, only one conduit may carry the wires for a group of
swithcboards.
 Demonstration of protective devices with proper current ratings.
 Location of MDB/SDBs are significant issue.
Distribution Board Connection Diagram

11. 11
Fittings and Fixture Layout
LEGEND
Switchboard
(Concealed)
Wall Bracket
Light at Lintel
Level
1
F1
Ceiling Fan
C1
TS1
- -
TV1
Fluorescent Wall
Light Fitting
SS 2-Pin 5A Socket
at Switchboard
(SB) Level
TS
2-Pin 5A Socket
at Skirting Level
for TV
- -TV 2-Pin TV
Antenna Socket
F2
A4
2
A2
A1
A3
SS3
SS1
SS2

12. 12
Assignment 1
We’ll have to perform the electrical design of
a single room which might be used as a store
room.

13. 13
Fittings and Fixture Layout (Example 1)
LEGEND
Switchboard
(Concealed)
Wall Bracket
Light at Lintel
Level
1
A1

14. 14
Conduit Layout (Example 1)
LEGEND
Switchboard
(Concealed)
Wall outlet at
Lintel Level
L
C1
C1=2x1.5mm2
L
1
Why arrow?

15. 15
Switchboard Connection Diagram (Example 1)
SB 1
A1
2x1.5mm2

16. 16
Assignment 2
 Let’s add some additional fixtures so that the store of
Assignment 1 can be used as living purpose as well.

17. 17
Fittings and Fixture Layout (Example 2)
LEGEND
Switchboard
(Concealed)
Wall Bracket
Light at Lintel
Level
1
A1
A2
F1
Ceiling Fan

18. 18
Conduit Layout (Example 2)
1
L
L F
C3
C1
C1
LEGEND
Switchboard
(Concealed)
Wall outlet at
Lintel Level
C3=6x1.5mm2
L
F Ceiling Fan outlet
C1=2x1.5mm2

19. 19
Switchboard Connection Diagram (Example 2)
SB 1
A2
2x1.5mm2
A1 F1
R

20. 20
Assignment 3
 Let’s modify the above room so that it can be
used as a complete bed room.

21. 21
Fittings and Fixture Layout (Example 3)
LEGEND
Switchboard
(Concealed)
Wall Bracket
Light at Lintel
Level
1
A1
A2
F1
Ceiling Fan
T1
ST1
TS1
--
TV1
Fluorescent Wall
Light Fitting
ST 2-Pin 5A Socket
at Table Height
Level
TS
2-Pin 5A Socket
at Skirting Level
for TV
- -TV 2-Pin TV
Antenna Socket

22. 22
Conduit Layout (Example 3)
1
L
L F
C23
C1
C2
LT
S
--
C1
C2
C1
LEGEND
Switchboard
(Concealed)
Wall outlet at
Lintel Level
C2=4x1.5mm2
L
F Ceiling Fan outlet
C1=2x1.5mm2
S
T
Socket outlet at
Skirting Level
Socket outlet at
Table Height Level
C23=2x(6x1.5mm2
)
- - 2-Pin TV
Antenna Socket

23. 23
Switchboard Connection Diagram (Example 3)
SB 1
A2
2x1.5mm2
A1 F1
R
T1ST1TS1

24. 24
Assignment 4
 Now, let’s perform electrical design for the
two-room layout shown below.

25. 25
Fittings and Fixture Layout (Example 4)
LEGEND
Switchboard
(Concealed)
Wall Bracket
Light at Lintel
Level
1
F1
Ceiling Fan
T1
TS1
- -
TV1
Fluorescent Wall
Light Fitting
SS 2-Pin 5A Socket
at Switchboard
(SB) Level
TS
2-Pin 5A Socket
at Skirting Level
for TV
- -TV 2-Pin TV
Antenna Socket
F2
A4
2
A2
A1
A3
SS3
SS1
SS2

26. 26
Conduit Layout (Example 4)
1
2
FL L
S
S
F
LS
L
S
- -
L
C1
C2
C1
C23C1
C2
C1
C2
C4
LEGEND
Switchboard
(Concealed)
Wall outlet at
Lintel Level
C2=4x1.5mm2
L
F Ceiling Fan outlet
C1=2x1.5mm2
S Socket outlet at
Skirting/SB Level
C4=2x2.5mm2
C23=2x(6x1.5mm2
)

27. 27
Switchboard Connection Diagram (Example 4)
SB 1
A2A1 F1
R
T1TS1SS2SS1 A4
2x1.5mm2
A3 F2
R
SS3
SB 2
2x2.5mm2

28. 28
End of Slides on Drawing
Lecture-1