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Cost estimation and design of interior wiring and distribution

networks for large housing complex including bill of quantity

According toBritish Standard

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Prof. Dr. Eng. Almoataz Abdelaziz

Dr. Eng. Mahmoud Abdallah

Supervisors

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Ahmed Abdelshafy Mohamed Ahmed Khaled Afifi Aya Mohamed Adel Aya Mostafa Mohamed Kareem Hamdy Sakr Ziad Adel Gad

Project Team

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Generation Transmission Distribution

Introduction

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Residential Model Pillar and Transformer Voltage Drop Short Circuit Earthing System Street Lighting Cost Estimation Bill of Quantity

Outlines

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Residential Model Sockets

Ahmed Khaled

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1. Normal Sockets

Residential ModelSockets

Room Purpose Minimum Number of sockets (Twin)

Living room 4Dining room 3

Kitchen 5Bedroom 3Corridor 1Terrace 1Garage 1

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for domestic loads: 100% of the largest point + 40% of the remainder.

For example

Circuit(LS1): Reception (area1) & Terrace (area10)

I(LS1)=1+0.4(1*9))=4.6 A I(C.B)= ≈ 10A .:. C.S.A = 2mm² C.S.A = 4mm²


Grouping FactorTemp. Factor

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Circuit No.

Current C.B C.S.A

LS1 4.6 10A 4mm²LS2 4.6 10A 4mm²LS3 4.6 10A 4mm²LS4 4.6 10A 4mm²LS5 4.6 10A 4mm²

Residential ModelSocketsSummary

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2. Power Sockets For example

Circuit (LP1): Bedroom(area7)

I(LP1)==19.08 A P.F=0.85 , Eff=0.8 , V=230 I(C.B)=A ≈ 40A .:. C.S.A = 10mm² Summary


LP1 19.08 40A 10mm²

LP2 10.23 26A 6mm²

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Residential ModelLighting

Aya Mohamed Adel

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Area Illumination Level [lux]

Salon 150Bedroom 100Bathroom 200Kitchen 300Corridor 100Terrace 100


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Residential ModelLightingLighting calculation approach1. Manual N= I(LL)=

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Residential ModelLighting K=

K

0.70.50.2

0.70.30.2

0.75 0.38 0.32

1.00 0.44 0.38

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For example

Circuit (LL1): Reception(area1) +Terrace(area10) +Corridor(area9)+Kitchen(area3)+Bedroom(area4)

Reception (Area1)N = = 3.3 =4 Luminaires


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Corridor (Area9)K = =0.34 ≈0.75.:. UF = 0.38N = = 1.4 = 2


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2. Dialux


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I(LL1)= = 8.45AI(C.B)= = 15 ≈ 16A .:. C.S.A =2.5 mm²

C.S.A = 3mm²


Circuit No.

Current

C.B C.S.A

LL1 8.45 16A 3mm²LL2 8.33 16A 3mm²LL3 8.225 16A 3mm²

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Residential ModelPower Factor

Aya Mohamed Adel

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, 2000 watt , 0 , , , = Then we get , , , then we get and finally

≈ 0.85

Residential ModelPower Factor

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Residential ModelMain Current Calculations

Aya Mostafa Eldeeb

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Phase

Lines Total Current

A LP1LL3 27.3A

B

LS1LS2LS3LP2

24.03A

C

LL1LL2LS4LS5

25.98A


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Panel BalanceAverage loading = = 25.77Deviation PHA = 27.3 – 25.77 = 1.53Deviation PHB = 24.03 – 25.77 = -1.74Deviation PHC = 25.98 – 25.77 = 0.21%unbalance= ≤ 10% = x 100% = 6.75%

I(CB)= 27.307*1.25 = 34.1 ≈ 40A∴ CSA= (4x16mm²)+16 mm² (TNCS)S = 3*V*I = 3*230*27.3 = 19 KVA


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Residential ModelEnergy Meter

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High efficiency

Residential ModelEnergy Meter

Pre paid meter

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Pillars & Transformers

Aya Mostafa Eldeeb

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I(feeder)= current of flat x no. of floor flats x no. of floors x no. of buildings x diversity

S (apparent power)= 3 x V x I


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I(feeder)= 32.5 x 12 x 1x 0.41 = 159.9A S = 3 x V x I= 3 x 230 x 99.7 = 110 KVA

I(feeder)= 32.5 x12 x 2 x 0.35 = 273 AS = 3 x V x I= 3 x 230 x 273= 188.4 KVA I(cable)=310 ACable rating between Pillar & Building = 3*300mm²+150mm²


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All pillars rating is 200 KVA

All transformers rating is 1 MVA


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Point of view Egyptian code British codeDiversity Factor

For lighting circuit=0.5

For normal sockets=0.4

For heater<3000watt=1

For air conditioner=0.5

I feeder=current of flat x no. of floor flats x no. of floors x no. of buildings x diversity


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Voltage DropAhmed Abdelshafy

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Voltage drop =, if CSA Voltage drop = , if CSA

Voltage Drop

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Socket Circuit

CSA= 3x4 , L= 20 m, mV/A/M=9.5 =4.5 A

VD = VD% = = 0.37% ≤ 2%

Voltage Drop

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Summary

Voltage Drop

Cable Length(m) Voltage Drop(v)

Voltage Drop

%I(LS1) (3*4) 20m 0.87 0.37%I(LS2) (3*4) 14m 0.61 0.26%I(LS3) (3*4) 15m 0.65 0.28%I(LS4) (3*4) 25m 1.09 0.47%I(LS5) (3*4) 17m 0.74 0.32%I(LL1) (3*3) 20m 2.52 1.09%I(LL2) (3*3) 20m 2.49 1.08%I(LL3) (3*3) 25m 3.07 1.33%I(LP1) (3*10)

13m0.94 0.40%

I(LP2) (3*6) 8m 0.52 0.42%

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Short CircuitAhmed Abdelshafy

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Short circuit level at transformer = 500MVA = 1.05

Determination of impedances:

1. Transformers impedance:From tables: Transformer of rating 1 MVA: Rtr = 1.94milli-ohm Xtr = 7.76 milli-ohm

Short Circuit

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2. Aluminum cable from transformer to pillar:

Type of cable 2(4*300 mm²) and length equals (24.7 m)

R=1.3585 (m.ohm) X= 1.729 (m.ohm)

Short Circuit

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3. Aluminum cable from pillar to coffree:

Type of cable (4*300 mm²) and length equals (46 m)

R= 5.06 (m.ohm) X= 3.22 (m.ohm)

Short Circuit

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4. Aluminum cable from coffree to distribution board:

Type of cable (4*16 mm²) and length equals (13 m)

R= 26.8 (m.ohm) X is Neglected as C.S.A is smaller than 25 mm²

Short Circuit

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Short circuit current calculation: 1. Calculation of s.c current just after transformer.

Ztransformer=8(m.ohm) Itransf= =30.1875 ≈31 KA

Short Circuit

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2. Calculation of s.c current from transformer to pillar.

(Impedance of transformer + impedance of first Al cable) =A

Za==10.05(m.ohm) IscA==24 KA

Short Circuit

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3. Calculation of s.c current from pillar to coffree.(Impedance of transformer + impedance of first Al cable + impedance of second Al cable) =B

Zb=(m.ohm) IscB==15.87 ≈16 KA

Short Circuit

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4. Calculation of s.c current from coffree to riser.(Impedance of transformer + impedance of first Al cable + impedance of second Al cable+ impedance of riser) =C

Zc=(m.ohm) IscC==7.6≈ 10KA

Short Circuit

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Earthing System Ahmed Abdelshafy

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Earthing System We are using TNC-S earthing system which

gathers safety and cost

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Street LightingKareem Hamdy

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Purpose

Types of lamp and poles

Street Lighting

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SODIUM LAMPAdvantages:High efficacy

Low power consumption

Low cost consumption

Street Lighting

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Normal pole

6m : Side streets, public gardens8m&10m : Traffic routes12m&15m : High speed dual carriageways

High mast

18M or more : Airports, stadiums and large industrial areas

Street Lighting

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Factors affecting street lighting design

A. Distance between poles

B. Height(1)

C. Overhang(2)

D. Boom angle(3)

E. Setback(4)

Street Lighting

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Design speed (Km/h)

Setback (m) Height (m)

50 0.8 5 or 680 1 8 or 10

100 1.5 12 or 15

Street Lighting

According to British standard code:

How to calculate setback, arm length , overhang?

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Arm length = height of pole

Overhang = Arm length-setback

Street Lighting

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Cont. Factors affecting street lighting design

Street Lighting

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Street Lighting Feeder Pillar

Responsible for feeding street lighting circuits

Contains three phase breakers connected on 4 core cable to feed poles

Contains a Photocell/Timer

Street Lighting

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Design using DIALux

Street Lighting

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File ⊲ Wizards ⊲ Quick Street PlanningStreet Lighting

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Street Lighting

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Dialux select the class of street lighting according to:

How high is the typical speed of the main user of the street?

Weather type ?

How many vehicles are there per day ?

Does a conflict zone exist ?

How is the street connected to other streets ?

Street Lighting

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Street Lighting

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Street Lighting requirementsA. Average luminance (L)

B. Overall uniformity (U0)

C. Longitudinal uniformity (U1)

D. Threshold increment (TI)

E. Surrounding ratio (SR)

These requirements depends on Road Type

Street Lighting

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Select luminaire

Street Lighting

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Street Lighting

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Street Lighting

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Street Lighting

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Street Lighting Summery Street Lighting

CSA(mm²)

I(feeder)

S(KVA)

P(kw)

No of colum

ns

Pillar

Transformer

16 25.46 17.64 7.5 30 P5 T516 26.3 18.2 15.5 62 P1 T816 17.8 12.3 10.5 42 P2 T816 41.1 28.5 24.2 97 P1 T1016 37.35 25.8 22 90 P1 T1116 24.19 16.76 14.2

557 P3 T12

16 28.43 19.7 16.75

67 P4 T14

Total number of poles used = 445 poles

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Cost Estimation

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Example(1):Indoor Lighting Circuit

Cost Estimation

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Example(2):Outdoor Cables

Cost Estimation

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Bill of QuantitySummary

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Bill of Quantity

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Bill of Quantity

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Bill of Quantity

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Bill of Quantity

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البريطانى للكود السعر اعمال نموذج16,462574 Type A6,178850 Type B11,572256 Type C8,600368 Type D24,999214 Layout67,813263 للمشروع االجمالى السعر

Bill of Quantity

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Thank You

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