Building Services Electrical Design Support - Overview / Help

INDEX KVAR PANEL TRAY BUSBAR LIGHT CABLES

CAPACITOR BANK PANEL BOARD CABLE TRAY

CABLES CONVERT Q.CALS

UNDER
CONSTRUCTION

Building Services_Electrical Design Support

 HELP
ABLES CONV. Q.CALS MECH. HELP
BUS BAR LIGHTING

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 CAPACITOR BANK_kVAR RATING CALCULATION

PROJECT NAME: DATE:

CAPACITOR PANEL REF: PREPARED BY:
PROJECT NO: PAGE NO:

Load in Kilowatts Normal Power factor Improving Power factor

Ref.No (Kw) (p.f) (p.f) Required kVAR Selected kVAR
1 900 0.85 0.9 121.88
2 500 0.7 0.9 267.94
3 900 0.5 0.8 883.85
4
5
6
7
8
9

Grand Total 1273.67

Formulae
kVAR = P x ( tanØ1 - tanØ2)

Where as,
P - Power in watts Comments
tanØ1 = tan(cos-1 p.f) Approved
tanØ2 = tan(cos-1 p.f) Date

BS_EDS V.Prathi
 PANEL BOARD _ SIZING CALCULATION

HEIGHT 1900 PROJECT NAME: DATE:

WIDTH 2000 PANEL REF: PREPARED BY:
PROJECT NO: PAGE NO:

1900
Chk Avl Ht 300 Chk Avl Ht 300 250 300 300 250 300
2000

Comments
Approved
Date

BS_EDS V.Prathi
 CABLE TRAY _ SIZE CALCULATION
PROJECT NAME: DATE:
CABLE TRAY REF: PREPARED BY:
PROJECT NO: PAGE NO:

Cable Type Cable Overall Layer1

Size in Sq.mm Diameter in mm Nos. Width
XLPE/SWA/PVC
2 Core 6mm 15.9 4 64
10mm 18 6 108
16mm 20 -
25mm 24.3 -
35mm 27.9 -
4 Core 6mm 18.7 -
10mm 21.1 -
16mm 22.9 -
25mm 29.1 -
35mm 32.1 -
50mm 32 -
70mm 37.7 -
95mm 41.7 1 42
120mm 47.1 5 236
150mm 51.4 -
185mm 56.6 -
240mm 63 1 63
300mm 68.8 -
Single Core 6491B (LSF)
10mm 6.8 -
16mm 8 -
25mm 9.8 -
35mm 11 -
50mm 13 -
70mm 15 -
-
MICC/PVC Heavy Duty
2 core 1.5mm (2H1.5) 9.6 -
2.5mm (2H2.5) 10.4 -
4mm (2H4) 11.5 -
6mm (2H6) 12.6 -
10mm (2H10) 14.4 -
4 core 2.5mm (4H2.5) 11.8 -
4mm (4H4) 13.1 -
6mm (4H6) 14.4 -
10mm (4H10) 16.5 -
16mm (4h16) 19.6 -
25mm (4h25) 22.9 -
Total Number of Cables 17
Cable width required 640 on 1 layers

Number of layers 1 Comments

Tolerance 25% Approved
Selected cable tray size in mm 700 Date
 BUS BAR _ VOLTAGE DROP CALCULATION
CONSTANTS
Cos Ø: 0.90 PROJECT NAME: Raffles city Tower 1 DATE: 10.07.08
Sin Ø: 0.44 PART : From 25 to 17 PREPARED BY: PV
Diversitiy: 0.80 BUSBAR NO: B3 PAGE NO: 1
Utility Voltage(V) 415 PROJECT NO: 2006069

POWER LINE RESISTANCE REACTANCE

LENGTH BUSBAR VOLTAGE VOLTAGE
OUTLET NO CURRENT ( ( mohm
(m) () DROP ( Vd ) DROP %E
( kW ) (A) mohm /m ) /m )
25TH FLOOR 3.50 70 87 KBC-II 1600 (Cu) 0.02550 0.03360 0.02 0.00
24TH FLOOR 3.50 60 161 KBC-II 1600 (Cu) 0.02550 0.03360 0.04 0.01
23TH FLOOR 3.50 60 235 KBC-II 1600 (Cu) 0.02550 0.03360 0.05 0.01
22TH FLOOR 3.50 75 328 KBC-II 1600 (Cu) 0.02550 0.03360 0.07 0.02
21TH FLOOR 3.50 75 420 KBC-II 1600 (Cu) 0.02550 0.03360 0.10 0.02
20TH FLOOR 3.50 70 507 KBC-II 1600 (Cu) 0.02550 0.03360 0.12 0.03
19TH FLOOR 3.50 75 600 KBC-II 1600 (Cu) 0.02550 0.03360 0.14 0.03
18TH FLOOR 3.50 70 686 KBC-II 1600 (Cu) 0.02550 0.03360 0.16 0.04
17TH FLOOR 104.00 70 773 KBC-II 1600 (Cu) 0.02550 0.03360 5.23 1.26
KBC-II 1600 (Cu) 0.02550 0.03360
KBC-II 1600 (Cu) 0.02550 0.03360
KBC-II 1600 (Cu) 0.02550 0.03360
KBC-II 1600 (Cu) 0.02550 0.03360
KBC-II 1600 (Cu) 0.02550 0.03360
KBC-II 1600 (Cu) 0.02550 0.03360
KBC-II 1600 (Cu) 0.02550 0.03360
KBC-II 1600 (Cu) 0.02550 0.03360
KBC-II 1600 (Cu) 0.02550 0.03360
KBC-II 1600 (Cu) 0.02550 0.03360
KBC-II 1600 (Cu) 0.02550 0.03360

TOTAL : 132.00 625 5.92 1.43

COMMENTS : As the voltage drop percentage is lower then 4% , the selected busbar current is correct. Result:
VOLTAGE DROP%E = 1.43

Formulae
ΔV = α√3.L.I(R.Cos Ø + X1.Sin Ø) 10 ¯³ [V]

Where as,
ΔV = Voltage Drop (V) R = Resistance (mΩ/m)
α = Load Distribution Constant X1 = Inductive Reactance (mΩ/m) Comments
L = Line Length (m) Cos Ø = Load Factor Approved
I = Line Current (A) Note: a constant is on amperic value Date

BS_EDS V.Prathi
 LIGHTING _ CALCULATION

PROJECT NAME: DATE:

BLOCK REF: PREPARED BY:
PROJECT NO: PAGE NO:

Room Ref. Room Data Illumination Data Lumens /

Lumens O/P No.of Fittings Req.
Length Width Height Lux Req Wattage of Lamps Fitting
Kitchen 5 4 2.8 200 18 1500 7142.8571 5
Dining 4 4 4 200 8 950 8113.5903 9
Majlis 4 4 3 150 13 1200 4524.8869 4
15 1300
18 1500
26 2000
30 2650
40 3000
50 4800
70 5800
80 7350
90 8000

Total Lumens O/P (Required) 19781.3343

Total Number of Fittings (Required) 18

Formulae
Lumens O/P = Lux(Req.) x Area / M.F x U.F

Where as,
M.F = Maintenance Factor Comments
U.F = Utilisation Factor Approved
R.I = Area x (Length x Breadth) / Height x (Length + Breadth) Date
 CABLE SELECTION CURRENT RATING_VOLTAGE DROP_PROTECTIVE CONDUCTOR

PROJECT NAME: DATE:

BLOCK REF: PREPARED BY:
PROJECT NO: PAGE NO:

Distribution Board Reference

Circuit Number
Type
Design Current Ib 2
Type of Cable
Type of Protective Device
Protective Device Rating In 2
Correction Factors:
Ca - Ambient Temp 3
Ci - Thermal Insulation 4
Cp - Protection Device 5
Single Circuit Current Rating In/Ca x Ci x Cp = It 0.033333333
Groups of Circuits (other than BS3036 fuses)
Number of circuits (where Ib > 0.3 x Cg x Ib)
Group Rating Factor "Cg" =(from table 4B1, 4B2,
4B3) 5

Are Circuits Liable to Simultaneous Overload? Y/N n

It ³ 1.46860478
Minimum Conductor Rating = Largest It/Ca x Ci = 0.122383732
Cable size chosen mm2
Maximum Permissable Voltage Drop
Length of Run (metres) 88
mV/A/m Parameter of Cable 8
Actual Voltage Drop: (Ib x L x mV/A/m) /1000 V 1.408
Phase Conductor Resistance ohms/m
Resistance R1 ohms 44
Maximum Disconnection Time 0.4s or 5s
Maximum Zs ohms
CPC constant "K" (BS7671)
CPC ohms/m
Resistance R2 ohms 8
Ze 9
Actual Zs ohms (Radial) Zs = Ze + R1 + R2 61
Actual Zs ohms (Ring) Zs = Ze + 0.25(R1 + R2) 22
Is Actual Zs £ Maximum Zs ? If NO, recalculate
If = Uo/Actual Zs
Time t from Appendix 3 (BS7671) sec. 8
I= 2
k= 3
Minimum Size of CPC mm2 3.265986324
Actual Size of CPC
Actual Size Acceptable? Y/N
If NO increase CPC size to mm2

Comments
Approved
Date
 Electrical Conversion P.F Power Length
1000 0.8 1 5

1250 1.0139 8800.00359

Volume Energy Kinematic Viscosity Dynamic Viscosity

1 13650 1 1
35.31466247 4.00042052 0.000001 0.00067197

Molar Flowrate Mass Mass Flowrate Heat Flux

1 1 1 1
0.3786675 2239.96911 0.00755987 3.154591

Volumetric Flowrate Density Heat Transfer Coefficient Specific Energy

490 1 1 1
288.4029637 0.01601846 0.00056783 2326

Pressure Area Thermal Conductivity Specific Heat

14.5 1 1 1
0.999739765 10.7639104 0.01730735 4186.8
 INDEX KVAR PANEL TRAY BUSBAR LIGHT CABLES

Areawise Electrical load requirements.

Project Type: Required Power Load in Kilowatts 41400
Cooling Strategy Power Factor (P.F) 0.8
Total Area in Sq.m 450000 Required Power Load in KVA 51750

Voltage Drop,Current Ratings of XLPE Multi Core Cables

Connected Load in Cable Size
Length in mtrs Total Voltage Drop (Vd) in Volts
Amps (A) in Sq.mm
35 75 6.5625
Total Voltage Drop in % 1.6006

Voltage Drop,Current Ratings of PVC Multi Core Cables

Connected Load in Cable Size
Length in mtrs Total Voltage Drop (Vd) in Volts
Amps (A) in Sq.mm
25 120 12
Total Voltage Drop in % 2.9268

Under Construction

Generators, Switchgears, Protective Devices, ELV Solutions, Earthing, Lightning Protection, Aircra
IP's, Standards , Codes & Advance Technology Updates
 ABLES CONV. Q.CALS MECH. HELP

Approximate No. of 1.5MVA

Transformer's Required
36

Max.Current Carrying
Capacity of the Selected 59
cable in Amps (A)

Max.Current Carrying
Capacity of the Selected 47
cable in Amps (A)

, Earthing, Lightning Protection, Aircraft Warnings ,

ce Technology Updates
INDEX KVAR PANEL TRAY BUSBAR LIGHT CABLES

Electric Power Conversion for Mechanical loads in Building Services

Fans Pumps

Volumetric flow Volumetric flow

21500
Static Pressure in millimeters 60 Head in Meters

Power Required in Kilowatts 28.67 Power Required in Kilowatts

Formulae Formulae
P = (Air flow x Static pressure) / (t x η x 75) P = (Q x H x δ ) / ( 367 x η )

Where as, Where as,

P - Power Q - Discharge
t - Time in seconds H - Head in meters
η - Effeciency δ - Density
 ABLES CONV. Q.CALS MECH. HELP

mps

etric flow
650
40

104.18
INDEX KVAR PANEL TRAY BUSBAR LIGHT CABLES

Building Services Electrical Design Support - Overview / Help

Instructions
You may move from worksheet to worksheet by clicking on the blue buttons
located at the top of each worksheet or the blue tabs at the bottom of this workbook.

Enter data in only the white cells with gray borders: 81

Use the drop down boxes to select the standard values

KVAR (Capacitor bank)

Create a quick and easy result for the required KVAR rating for the capacitor panel by filling out the white cells on the "Capac
Sheet. As in the calculation format fill the connected load in kilowatts ,initial Power factor (P.F) and correction Power Factor .
KVAR rating of the capacitor panel for individual sections as well Bulk. Either select the exact value or select the next availa
(Comply with local regulations.)

Panel
Use this "Panel sizing calculation sheet" to get the size of the LV panel's. Use drop down box at the Top left of the format to s
Use the drop down boxes in the format to get the standard ratings of the incomers & Outgoings. Select the breaker ratings b
boxes in the compartments, Note that the down side dimensions should not be "Check availabilty Height".In such a case, Eith
Protective Device instead of high rated Protective device or remove (select empty ----------- indicates no compartment) any of
/ Compartment in that particular column.

Tray
In this sheet there are two formats for the cable tray selection whereas first format will gives the exact width with our customis
our local regulations) and the second format will be considered as the international standard with having the expand space fa
more for the security reasons notified by the NFPA standards & it should be mainly considered in industrial projects as well a

Busbar
Uses this "Busbar_ Voltage drop calculation" sheet to select the Copper busbar ratings . The constant values are common fo
distance & connected loads at every tapoff can be fill by rows. The Diversity factor applied by us in the white cell is considere
Select the available standard ratings of bus bars by using the drop down boxes. "Increase (A) rating" indicates that the select
Line current, By selecting the higher size will gives the good result if the voltege drop must not exceeds the limit.

Light
Uses this “Lighting_ Calculation” to find the total lumens O/P & number of fittings required for an area by our recommended l
in watts and also fill the inputs such as length, Width & height of the area in the white cells with grey borders.

Cable
In this sheet there are two format for Cable schedule. You can customize your format for the cable schedule as per your stan
Conv.
Enter the value in white cells with grey borders & select the units by using drop down boxes for Unit conversions.

Q.Cals.
Area wise Electrical Load requirements: As per CIBSE rule of thumb we can determine the Approximate electrical load & Ma
Ampere Transformer's required by filling total area of the project in Square meter, Also select the Type of project,Infra and fi

Voltage drop.Current ratings of Multicore XLPE & PVC Cables : Create a quick and easy selection of cable by filling out the w
"Quick Cals" sheet. Enter the "Amps rating,length of cable" in the white cell.Select the "Standard Cable Size"by using the dr
in the cell. The Total Voltage drop & Percentage of Votage Drop (Vd) are calculated for you. "Increase cable size for CCC"
can't carry the connected load, for solution Select the next size cable.
 ABLES CONV. Q.CALS MECH. HELP

nel by filling out the white cells on the "Capacitor bank_kVAR calculation"
er factor (P.F) and correction Power Factor .We will get the required
lect the exact value or select the next available rating in the market.

op down box at the Top left of the format to select the height of the Panel.
s & Outgoings. Select the breaker ratings by using the drop down
Check availabilty Height".In such a case, Either replace the Low Rated
y ----------- indicates no compartment) any of the Protective device

at will gives the exact width with our customised tolerance (ie as per
al standard with having the expand space factor / Groupings having 50%
nly considered in industrial projects as well as in highrise buildings.

ratings . The constant values are common for the calculation. Floor levels,
or applied by us in the white cell is considered in the line current.
"Increase (A) rating" indicates that the selected Busbar rating the
drop must not exceeds the limit.

required for an area by our recommended lux level & type of fitting
white cells with grey borders.

rmat for the cable schedule as per your standard format.

own boxes for Unit conversions.

ermine the Approximate electrical load & Max. Number 1.5Mega Volt
r, Also select the Type of project,Infra and fill the available power factor.

nd easy selection of cable by filling out the white cells on the

ect the "Standard Cable Size"by using the drop down menu provided
ated for you. "Increase cable size for CCC" indicates the selected cable

By V.Pradeesh (2007-08)