CKT NO
R1
Y1
B1
R2
Y2
B2
R3
Y3
FOR 1 PLOT POWER=25785
FOR CURRENT
I=P/3VCOS
P=
V=
I=
COS=
AREA
LIGHTS FANS
BR1
BR2
TOILET1
TOILET2
DINING HALL
HALL
KITCHEN+UTILITY
BALCONY
THEN FOR 4 PLOTS
2
2
1
1
2
4
5
2
19
1
1
0
0
0
2
0
0
4
103140
103140
415
?
0.8
179.3664264
I=
ADDING 25% FOR FUTURE USE
I=
224.2080331
SINCE I<200 AMPS
We need 3.5C x 25MM2 Alum/PVC/AWA/
SINCE I=56 AMPS WE ARE SELECTING 4 POLE 63 AMPS MCB
TRANSFORMER SELCTION
KVA = KW/PF
KW=
PF=
KVA=
with a design margin of 25%
25% more for future loads.
103.14
0.8
128.925
161.15625
201.4453125
EX-FANS
6A
0
0
1
1
0
0
1
0
3
DB
3
3
1
1
1
2
4
0
15
15A
0
0
0
0
0
1
0
0
1
GYSER AC
1
1
0
0
1
2
2
0
7
PVC/AWA/PVC CABLE
PS MCB
0
0
1
1
0
0
0
0
2
R
1
1
0
0
1
2
0
0
5
4000
4000
1760
1760
3720
7625
2800
120
8560
7840
25785
9385
Calculation for the voltage drops in the cable.
System Voltage
415
Cable Length
300
Resistance of the cable
0.102
Current
180
%Vd
%Vd
((2xIxRxL/1000)/V)x100
2.654458 %
Volts
Meters
Ohms/Km For Aluminium cable size of 400 Sq.mm
Amps
000)/V)x100
The voltage drop is less than 3%. Hence this cable can be used.
AREA
LUX
LUMENS OF LAMP
CO-EFFICIENT OF UTILITY
MAINTANANCE FACTOR
12
300
2425
0.47
0.8
NO.OF FIXTURES
3.948234262
CKT NO
PHASE
LCKT 4
R2
R1
B1
Y1
Y2
LCKT 1
LCKT 3
LCKT 2
LCKT 6
POWER CIRCUIT
CKT NO
PHASE
PCKT 1
B2
R3
Y3
B3
R4
B4
R5
PCKT 2
PCKT 3
PCKT 4
PCKT 5
PCKT 6
PCKT 7
TOTAL LOAD/FLAT
THEN FOR 4 PLOTS
FOR CURRENT
P=
V=
I=
COS=
I=
ADDING 25% FOR FUTURE USE
I=
SINCE I<200 AMPS
We need 4C x 25MM2
SINCE I=56 AMPS WE ARE SELECTING 4
CAPACITOR BANK SELCTION
K
Power(KW)
KVAR
TRANSFORMER SELCTION
KVA = KW/PF
KW=
PF=
KVA=
Adding25 % Future load (KVA)
According to the results obtained the
rating of the transformed should be
AREA
LIGHTS
FANS
EX-FANS
6A
DB
15A
LIVING HALL+BAL
BR1
DINING HALL+KIT+UTILITY
BR2
T1+T2
CONNECTED LOAD
17
12
MAXIMUM DEMAND
14
10
0.8235294
0.8
LIGHTS
FANS
EX-FANS
6A
DB
15A
DEMAND FACTOR
AREA
BR1+BR2+HALL
DINING HALL
0.666666667 0.83333
T1+T2
BED ROOM1
BED ROOM2
HALL
DRAWING HALL
20420
81680
W
W
I=P/3VCOS
81680
415
?
0.8
142.046245
177.5578063
ed 4C x 25MM2 Alum/PVC/AWA/PVC CABLE
S WE ARE SELECTING 4 POLE 63 AMPS MCB
0.265677895
81.68
21.70057046
81.68
0.9
90.75555556
KVA
113.4444444
KVA
125
KVA
GYSER
AC
520
520
640
640
GYSER
AC
625
625
520
520
740
1000
2000
2
1
3000
2500
2500
2500
2500
2000
2500
2500
2500
1000
2000
3000
1
740
2500
2000
6500
7180
6740
ROOM AREA
AREA
AREA
LENGTH (M)
BREADTH (M)
AREA in Mt
NOsqr
OF FIXTURES
BED ROOM 1
3.26
3.7
12.062
2 RUNS OF 2.5 SQMM+1 RUN OF 1.5 SQMM
HALL
5.31
3.7
19.647
2 RUNS OF 2.5 SQMM+1 RUN OF 1.5 SQMM
BED ROOM-2
3.76
3.34
12.558
2 RUNS OF 2.5 SQMM+1 RUN OF 1.5 SQMM
DINING HALL
2.69
3.45
9.2805
2 RUNS OF 2.5 SQMM+1 RUN OF 1.5 SQMM
KITHCHEN
2.51
3.34
8.3834
2 RUNS OF 2.5 SQMM+1 RUN OF 1.5 SQMM
TOILET-1
1.78
1.67
2.9726
2 RUNS OF 2.5 SQMM+1 RUN OF 1.5 SQMM
TOILET-2
1.29
2.32
2.9928
2 RUNS OF 2.5 SQMM+1 RUN OF 1.5 SQMM
BALCONY
1.79
1.92
3.4368
2 RUNS OF 2.5 SQMM+1 RUN OF 1.5 SQMM
FAN
POINT
LIGHT POINTS
BED ROOM -1
2-WAY
LIGHT
POINT
HALL
BED ROOM-2
5 AMPS
5 AMPS
TELEP EXHAU FOOT GATE
SOCKET
SOCKET
TV
HONE ST FAN LAMP LIGHT
DEPEND
INDEP
ENT
1
1
3
1
1
1
TV TELEPH
BELL TOTAL CONNECTE
JUNCTI ONE
DB
POINT
POINTS D LOAD
ON JUNCTI
BOX ON BOX
13
895
1
GYSE
R
A.C
1
11
560
655
300
780
TOTAL
POINTS
15A
1
1
3
1
DINING HALL
KITHCHEN
TOILET-1
260
TOILET-2
260
BALCONY
160
UTILITY
160
60
57
4090
GATE
TOTAL
WATTAGE/UNIT
INDIVIDUAL POWER CONSUMED BY EACH
13
60
780
5
80
400
2
60
120
9
100
900
12
100
1200
3
100
300
3
0
3
100
300
2
15
30
1
60
60
1
0
BALANCING THE LIGHTING LOAD
CIRCUIT NO
1
2
3
4
5
BALANCING THE POWER LOAD
PHASE
AREA
R1,R2
Y1,Y2
Y3
R3,R4
Y4,Y5
BED ROOM 1 +T1+BALCONY
BED ROOM 2+ T2
KITCHEN
DINING HALL, UTILITY
HALL
POINTS LOAD MAX POINTS
MAX LOAD
AS PER
ASNEC
PAR NEC (WATTS)
18 1315
12 915
9 780
6 460
11 560
160
10
10
10
10
10
10
800
800
800
800
800
800
8
515
2
115
1.00 20.00
4.00 340.00
1.00 240.00
10.00 640.00
1
0
1
0
1
25
25
700
4115
0
3
4
2
2500 1500
10000 3000
6
1000
6000
5000
19000
CIRCUIT NO
1
2
3
4
PHASE
AREA
B3
R5,R6,R7
Y6
Y7
KITCHEN
HALL
BED ROOM 1
BED ROOM 2
POINTS LOAD
3
3
1
1
3000
6000
2500
2500
MAX
POIN
TS AS
3
3
3
3
MAX LOAD AS PAR NEC (WATTS)
3000
3000
3000
3000
5 B4
6 B5
TOILET1+TOILET2
TOILET1+TOILET2
POWER CONSUPTION PER FLAT
R
Y
B
TOTAL CONNECTED LOAD(W)
DEMAND FACTOR
MAXIMUM DEAMAND(W)
MAXIMUM DEAMAND(KW)
7775
7255
8000
23030
0.65
14969.5
14.9695
FOR CURRENT
P=
V=
I=
COS=
I=P/3VCOS
I=
26.032826
14969.5
2
2
415
?
0.8
0.6967 1.4353
32.541033
We need 4C x 25MM2 Alum/PVC/AWA/PVC CABLE
SINCE I=33 AMPS WE ARE SELECTING 4 POLE 63 AMPS MCB
CAPACITOR BANK SELCTION
K
Power(KW)
KVAR
TRANSFORMER SELCTION
0.2656779
14.9695
3.97706525
3 3000
3 3000
POWER CONSUPTION FOR EIGHTY FIVE FLATS
R
660875
Y
616675
B
680000
TOTAL CONNECTED LOAD(W)
1957550
DEMAND FACTOR
55.25
MAXIMUM DEAMAND(W)
1272407.5
1.27
MAXIMUM DEAMAND(KW)
1272.4
ADDING 25% FOR FUTURE USE
I=
3000
2000
KVA = KW/PF
KW=
PF=
14.9695
0.9
KVA=
16.632778
KVA
Adding25 % Future load (KVA)
20.790972
KVA
According to the results obtained
the rating of the transformed
should be
125
KVA
WATTS/ UNIT
CONNECT
ED LOAD
2500
6000
2500
0
3000
2500
2500
0
0
0
LOAD/CIRCUIT (WATT)
