EEE 314 Lecture 7 Drawing A

7/28/2019 EEE 314 Lecture 7 Drawing A

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EEE 314

Electrical Services Design

Conduit Layout Lecture 2

Prepared by: Md. Itrat BinShams (Sanin)


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Prepared by: Md. Itrat Bin Shams (Sanin)

Lecturer, EEE, BUET.

Some points related to previous lecture:

5A receptacle points can be a three pin or two pin points, but a 15A receptaclepoint is always a three pin point.

While designing a single storied building, we are always seeing the conduits going

down. So conduit going down mark should be placed after each conduittermination.

In fittings and fixture diagram fluorescent lights must be small in length comparedto the diameter of ceiling fan.

Conduits must be connected to the point of appliances electrical connection. Notto appliances outside edge. As,

Any size of conduits can be used but only those available to the market have to beused.

5A components are driven by 1.5 mm2 wires and 15A components from 4 mm2. 2.5mm2 wires are also used to drive some instruments but it is usual practice to use 4

Wrong Right


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Some general concepts about a condui t layout:

There should be as small number of cross points of conduits as possible.

If more than one conduit is to be placed in a room then 90oalignment between theconduits should be kept as long as possible.

Prime target of conduit layout is to use least length of conduit not least number ofthem.

There is no need to place a separate conduit for two switchboard interconnection.

Any other conduits can be used to take the connecting wire.

Wires are cheaper than conduits, so there should be no law about how much wireis need in a conduit layout.

Wire cross

sections are

expressed as this


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Example 1:Fittings and Fixtures layout:

F1

F3

TV1TS1

SS1

C2

A1

3

4

A2

5


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Conduit Layout:

2

L

3

L

4

5

L

L

L

L

S

S

T

L

S

F

FF

S

C2

C3C6 C7

C2

C1

C1

C4

C2

C1

C1

C3

C1

C2

C1

C1


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Switchboard Connection Diagram:

SB 1

R

K K C F SS ST TS

1 2 1 1 1 1 1

SB 2

R

A C F SS

1 2 2 2

SB 3

R

A F SS

2 3 3

SB 4SB 5


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F1

F2

F3

K1 K1

C1

TV1TS1

1SS1

2

SS2

C2

A1

ST1

3

SS3A2

5

SL1 5A

A3

A4

6

7

L1

L2

L3


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Conduit Layout:

2

L

L

L

L L

L

S

S

T

L

S

F

FF

S

C2

C3

C6 C7

C1

C1

C1

C4

C2

C1

C2

C4

C1

C2

C1

C1

C1

C1

C2

C2

C1


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SB 1

R

K K C F SS ST TS

1 2 1 1 1 1 1

SB 2

R

A C F SS

1 2 2 2

SB 3

R

A F SS

2 3 3

SB 4SB 5SB 6SB 7


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F1

F2F3

K1K1

TV1

1SS1

2

SS2

C2

ST1

3

SS3

5

SL1 5A

A3

A4

6L1

L2

L3

S115A


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Conduit Layout:

2

L

3

L

5

L

L L

L

S

S

T

S

F

FF

C2

C3C6 C7

C1

C1

C4

C2

C1

C2

C4

C1

C2

C1

C1

6

C1

C1

C2

C2

C1

S

C8 C9

C8,9

Main

Earthing

2

GI PipeContaining

Incoming

Cable


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SB 1

R

K K C F SS ST TS

1 2 1 1 1 1 1

SB 2

R

A C F SS

1 2 2 2

SB 3

R

A F SS

2 3 3

SB 4SB 5SB 6SB 7

2X1.5 mm2

ECC 16SWG

2X1.5 mm2

ECC

16SWG

2X1.5 mm2

ECC

16SWG 2X2.5 mm2

ECC

16SWG

2X2.5 mm2

ECC

16SWG


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Distribution Board Connection Diagram:

Legends of Wires:

C1 = 2X1.5mm2

C2 = 4X1.5mm2C3 = 6X1.5mm2

C4 = 8X1.5mm2

C5 = 10X1.5mm2

C6 = 12X1.5mm2

C7 = 14X15mm2

SB4 SB6 S1

2X70mm2

PVC/PVC

Underground CablsThrough 2

GI Pipes

100A SP

MCB

To Supply

MDB

2X2.5 mm2

ECC 16 SWG2X2.5 mm

2

ECC 16 SWG

2X4 mm2

ECC 14 SWG

10 10 15


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Some points related to this lecture:

Three pin receptacle points to drive exhaust fans are denoted as, .Like other lintel level components.

Three pin 15A receptacle points are driven by distribution board directly, not fromany switchboard as other plug points. 2X4 mm2 wire is need for one such a point.

Switchboards are connected to distribution board via 1.5 or 2.5 mm2 wires and 4mm2 in case of very high loads (unusual for domestic purposes).

L


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Practice Section:

Draw Conduit Diagram and Switchboard connection Diagram for Example1:

2

L

3

L

4

L

L

L

L

S

S

T

S

F

FF


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Draw Conduit Diagram and Switchboard connection Diagram for Example2:

2

L

L

5

L

L L

L

S

S

T

S

F

FF

S


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Draw Conduit Diagram and Switchboard connection Diagram andDistribution Connection Diagram for Example 3:

Assignment:

1. Design a two or three room home by yourself. Place suitable electricalappliances on that design and have fittings and fixture layout, conduitdiagram layout and distribution connection diagram.

2. Give fittings and fixture layout, conduit diagram layout and distributionconnection diagram for assignment two figure.

3. Give fittings and fixture layout, conduit diagram layout and distributionconnection diagram for assignment two figure.


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Assignment 2 Figure:

F1

F3

K1

C1

TV1TS1

1SS1

SS2

C2 A1 3

4

A2

5

SL1 5A

6

7

L2

S115A

A2

ST2


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Assignment 3 Figure:

F1

F2

F3

K1K1

C1

TV1TS1

SS1

2

SS2

C2 A1 3

4

SS3 A2

5

SL1 5A

A3

6

7

L1

L2

L3

L4

S1

15A

ST1

ST2

F4

C3

C4

A5

9

SS5

A2S2

15A

8

K3K4

SS4

10

L5L6

SL2 5A

Documents

EEE 314 Lecture 7 Drawing A