PROJECT:

TITLE : CABLE SCHEDULE/VOLTAGE DROP CALCULATION FOR POWER CABLE

Total Verification
Rated Derated
Total Load Load Volt cable Total
Cable No. of current current Voltage Total Total
Connected Power Current Cable Cable size Installation Drop/ carrying Vd(%) Current Cable
S.No. From To length Cable of cable of cable Drop (V) Cumulati Voltage Terminati
Load (K W) factor (A) Type Sq. mm Method Ampere / current rating Length
(Cos Ø) (mtrs) Runs (amp) (amp) ve Vd(%) Drop ons
meter (amp)-H (m)
3ph. 3ph. 3ph. 3ph. 3ph. 3ph. 3ph. 3ph.
XLPE/SWA 3.5Cx95
1 T/F-1 SMDB 77 0.80 10 1 133.70
/CU/PVC sqmm-AL
In GROUND 0.72 196 157 157 0.96 0.23 0.23 OK OK 10 2

COMMON XLPE/SWA 4Cx10

13 AREA SMDB
DB1 11 0.80 16 1 18.57
/CU./PVC sqmm-AL
In Air 0 0 0.00 0.00 0.23 OK NOT OK 16 2

COMMON XLPE/SWA 4Cx6 sqmm-

14 AREA SMDB
DB2 3 0.80 10 1 5.27
/CU./PVC AL
In Air 0 0 0.00 0.00 0.23 OK NOT OK 10 2

COMMON XLPE/SWA 4Cx6 sqmm-

15 AREA SMDB
DB3 3 0.80 40 1 5.41
/CU./PVC AL
In Air 0 0 0.00 0.00 0.23 OK NOT OK 40 2

COMMON XLPE/SWA 4Cx16

16 AREA SMDB
DB4 9 0.80 10 1 14.85
/CU./PVC sqmm-AL
In Air 4.2 70 56 56 0.62 0.15 0.38 OK OK 10 2

COMMON XLPE/SWA 4Cx10

17 AREA SMDB
DB5 7 0.80 30 1 11.65
/CU./PVC sqmm-AL
In Air 0 0 0.00 0.00 0.23 OK NOT OK 30 2

COMMON XLPE/SWA 3.5Cx35

18 AREA SMDB
KDB 41 0.80 12 1 70.95
/CU./PVC sqmm-AL
In Air 1.9 117 94 94 1.62 0.39 0.62 OK OK 12 2

COMMON XLPE/SWA 4Cx6 sqmm-

19 AREA SMDB
BOOSTER PUMP 2 0.80 15 1 3.48
/CU./PVC AL
In Air 0 0 0.00 0.00 0.23 OK NOT OK 15 2

COMMON XLPE/SWA 4Cx6 sqmm-

20 AREA SMDB
INVERTER 2 0.80 10 1 3.44
/CU./PVC AL
In Air 0 0 0.00 0.00 0.23 OK NOT OK 10 2
 Max.
S.No. Derating Factor Description Conditions Remarks S.No MCB/MCCB/ACB
600/1000V Cable Type XLPE/SWA/CU/PVC OR XLPE/SWA/CU/FR(LSZH) Rating (A) S.No Cable type
A 30 degree C 1.10 1 Not applicable 1 XLPE/SWA/CU/PVC

CPC(CU.) Volt drop/ Rated current(A) 35 degree C 1.05 2 6 2 XLPE/SWA/CU/FR(LSZH)

Ambient
Cable(CU.) Sq.mm Sq.mm ampere/meter In Ground In Duct In Air Remarks temperature 40 degree C 1.00 3 10 3 1C - CU/PVC
45 degree C 0.95 4 16 4 1C - CU/FR
1C X 240 sqmm -CU ASSUMED Rating factor for Variation in 50 degree C 0.89 5 20
3.5Cx300 sqmm-AL 1Cx150 sqmm-CU 0.26 367 455
Ambient/Ground temperature. 20 degree C 0.97 6 25
3.5Cx240 sqmm-AL 1Cx120 sqmm-CU 0.31 326 399 25 degree C 0.93 7 32
3.5Cx185 sqmm-AL 1Cx95 sqmm-CU 0.39 282 337
Ground 30 degree C 0.89
Referred Ducab catalogue 8 40
temperature Page-10 Table 2.
3.5Cx150 sqmm-AL 1Cx95 sqmm-CU 0.48 249 292 35 degree C 0.86 9 50
3.5Cx120 sqmm-AL 1Cx50 sqmm-CU 0.58 223 257 40 degree C 0.82 10 60
0.72 196 221 Rating factor for variation in Not Applicable. (600/1000V
3.5Cx95 sqmm-AL 1Cx50 sqmm-CU 750mm 1.00 11 80
B depth of laying of cables laid Depth of laying Cables are not Directly 12 100
3.5Cx70 sqmm-AL 1Cx 35 sqmm-CU 0.99 164 179 900mm 1.00
directly in the ground. buried )
3.5Cx50 sqmm-AL 1Cx25 sqmm-CU 1.4 133 142 1050mm 1.00 13 125
1.9 113 117
3.5Cx35 sqmm-AL 1Cx16 sqmm-CU Thermal 150 1.00 Not Applicable. (600/1000V 14 160
Rating factor for variation in 15 200
3.5Cx25 sqmm-AL 1Cx16 sqmm-CU 2.7 94 96 C resistivity of 200 1.00 Cables are not Directly
thermal resistivity of soil.
4Cx16 sqmm-AL 1Cx 6 sqmm-CU 4.2 78 70 soil in °C-cm/W 250 1.00 buried ) 16 225
4Cx10 sqmm-AL 1Cx 6 sqmm-CU 300 1.00 17 250

4Cx6 sqmm-AL 1Cx4 sqmm-CU 1 1.00 18 300

4Cx4 sqmm-AL 1Cx4 sqmm-CU 2 1.00 19 350
3 1.00
Not Applicable. (600/1000V 20 400
4X 1Cx16 sqmm-CU PVC 1Cx 6 sqmm-CU PVC - No. of cables
Cables are not Directly
with touching
4X 1Cx10 sqmm-CU PVC 1Cx 6 sqmm-CU PVC
-
4 1.00
buried ) 21 630
4X 1Cx6 sqmm-CU PVC 1Cx4 sqmm-CU PVC - Group rating factor for cables 5 1.00 22 800
4Xx4 sqmm-CU PVC 1Cx4 sqmm-CU PVC - D laid directly in ground in 6 1.00 23 1000
horizontal formation.

No. of cables 2 1.00 Not Applicable. (600/1000V 24 1600

3X1C630 sqmm-CU None 0.24 756 756 756 with 150mm 3 1.00 Cables are not Directly 25 2500
ASSUMED CURRENT spacing buried ) 26 4000
3X1C500 sqmm-CU None 0.25 650 650 650 4 1.00
RATING
3X1C400 sqmm-CU None 0.2 635 635 560 5 1.00
3X1C 300 sqmm-CU None 0.2 329 329 387 6 1.00
No. of cable trays in No. of cables in a
3X1C240 sqmm-CU None 0.2 298 298 343
a tier tray
3X1C185 sqmm-CU None 0.3 261 280 280 1 0.95 Assumption
3X1C150 sqmm-CU None 0.3 232 232 258 2 0.85
3X1C120 sqmm-CU None 0.4 209 209 226 3 0.80
1 Referred 0ES-4 Page-58,
3X1C95 sqmm-CU None 0.5 185 185 197 4 0.70
Table-4.
3X1C70 sqmm-CU None 0.5 155 155 161 5 0.65
3X1C50 sqmm-CU None 0.9 126 126 127 6 0.57
3X1C35 sqmm-CU None 1.2 107 106 106 1 0.95 Assumption
3X1C25 sqmm-CU None 1.7 89 87 87 2 0.85
3X1C16 sqmm-CU None 2.5 68 64 64 Group rating factor for cables 3 0.80
2 Referred 0ES-4 Page-58,
3X1C10 sqmm-CU None 4 53 48 48 laid inside concrete trench 4 0.70
Table-4.
3X1C6 sqmm-CU None 6.8 38 35 35 with removable covers, on 5 0.65
3X1C4 sqmm-CU None 10 32 27 27 cable trays where air 6 0.57
E
3X1Cx16 sqmm-CU PVC None 2.5 - 44 44 circulation is restricted. The
3X1Cx10 sqmm-CU PVC None 4 - 33 33 trays in tiers by 300mm. The
clearance of the cable from
3X1Cx6 sqmm-CU PVC None 6.8 - 24 24
the trench/wall is 25mm.
3X1Cx4 sqmm-CU PVC None 10 - 19 19

Rated 1 0.95 Assumption

current( Rated
Rated current(A) A) current(A) 2 0.85
Volt drop/
CPC(CU.) ampere/meter CONDUI
3 3 Referred 0ES-4 Page-58,
Cable(CU.) Sq.mm Sq.mm T TRUNKING 0.80
2X 1CX1.5 0.70
Table-4.
1C X 1.5 Sqmm Cu 29 - 11 11 4
2X 1CX2.5 1C X 2.5 Sqmm Cu 18 - 15 15 5 0.65
2X 1CX4 1C X 4 Sqmm Cu 11 - 20 20 6 0.57
No.of cable trays in no of cables in a
7.3 - 25 25
2X 1CX6 1C X 4 Sqmm Cu a tier tray
2X 1CX10 1C X 6 Sqmm Cu 4.4 - 35 35 1 0.95 Assumption
Referred 0ES-4 Page- 57
2X 1CX16 1C X 6 Sqmm Cu 2.8 - 45 45 2 0.85
Table 2
2X 1CX25 1C X 16 Sqmm Cu 1.8 - 59 59 3 0.80
2X 1CX35 Referred 0ES-4 Page-58,
1C X 16 Sqmm Cu 1.3 - 72 72 1 4 0.70
Table-4.
2X 1CX50 1C X 25 Sqmm Cu 1 - 116 116 5 0.60
2X 1CX70 1C X 35 Sqmm Cu 0.72 - 139 139 6 0.57
2X 1CX95 1C X 50 Sqmm Cu 0.56 - 188.1 188.1 9 0.50 Assumption
2X 1CX120 1C X 50 Sqmm Cu 0.47 - 200 200 1 0.95 Assumption
Group rating factor for cables
laid on cable trays exposed to 2 0.85
air.The cables touching and 3 0.80
F 0.70 Referred 0ES-4 Page-58,
trays in tiers by 300mm. The 2 4
Table-4.
clearance of the cable from 5 0.60
the wall is 25mm. 6 0.57
9 0.50 Assumption
1 0.95 Assumption
2 0.85

3 0.80 Referred 0ES-4 Page-58,

3 4 0.70 Table-4.
5 0.60
6 0.57
9 0.50 Assumption
0 1.00 not applicable

Power factor 1 0.90 Assumption

2 0.85
For pumps and
1 equipments(ACM 0.8 3
V & PHE) 0.80
For all other type Rating factor for cables laid
0.9 4
2 of loads direct in single way No. of cables 0.70
G
ducts/pipes in horizontal with touching 5 0.65
formation. Referred 0ES-4 Page-58,
Table-5.

0.57

no of circuits in a
No.of cable trunking
trunking/ conduit/
in a tier
duct

0 0 1.00 Not Applicable

1 0.90 Assumption
2 0.80
3 0.70
0.65
Referred 0ES-4 Page-57,
4
1 Table-2.
5 0.60
Group rating factor for single 6 0.57
core wires laid on cable
trunking, conduit/ ducts.The 9 Assumption
0.50
H wires are touching and 1 0.90 Assumption
trunking in tiers by 300mm.
The clearance of the cable
from the wall is 25mm. 2
0.80
Referred 0ES-4 Page-57,
3 0.70 Table-2.
2
4 0.65
5 0.60
6 0.57

9 Assumption
0.50
1 0.90 Assumption
2 0.80
3 0.70
Referred 0ES-4 Page-57,
3 4 0.65
Table-2.
5 0.60
6 0.57
9 0.50 Assumption
CONSIDERATIONS
1. Current carrying capacity datas referred from OES-4, Table-4 Page-58.
2. For Multicore cables CU- XLPE Volt drop/A/m are referred from Ducab cable Catalogue. Refer Page No. 25, Table -26.
3. For single core CU/PVC wires Volt drop/A/m are referred from Ducab cable Catalogue. Refer Page No. 6, Table -2.
4. For single core CU/FR wires Volt drop/A/m are referred from Ducab cable Catalogue. Refer Page No. 4.
4. Derating factors are referred from OES4/ Ducab catalogue.
5. All cables shall be laid touching each other. Suitable Derating (Grouping) factor are considered as per OES4.
6. All MCCB rating shall be selected based on BS 5467/6004/6346.
7. Cable length shown above column is tentative only , exact length shall be ascertained as per site condition.