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Power Cable Sizing & Voltage Drop

The document provides calculations for power cable specifications, focusing on a copper/PVC armoured cable with a length of 40 meters and an amperage of 61.9. It includes details on current carrying capacity, voltage drop values for different configurations, and correction factors for temperature and grouping. The maximum permissible voltage drop in a power industrial circuit should not exceed 5% of the declared supply voltage according to BS 7671.

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Pyroclave Middle East
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21 views1 page

Power Cable Sizing & Voltage Drop

The document provides calculations for power cable specifications, focusing on a copper/PVC armoured cable with a length of 40 meters and an amperage of 61.9. It includes details on current carrying capacity, voltage drop values for different configurations, and correction factors for temperature and grouping. The maximum permissible voltage drop in a power industrial circuit should not exceed 5% of the declared supply voltage according to BS 7671.

Uploaded by

Pyroclave Middle East
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Power Cable Calculations Cable type : Copper/ PVC/ Armoured/ Twin or Multicore

Length 40 meters Output data


Amperage 61.9 amperes
Input data
Temp. 40 °C Cable to use 4 X #### mm²
Grouping 3 cables

0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0

Size of cable mm² 1.5 2.5 4 6 10 16 25 35 50 70 95 120 150 180 240 300 400 500 630
Current carring capacity 18 24 31 41 56 73 97 119 147 180 219 257 295 333 393 451 523 - -
Details of volage drop
% of voltage drop 26.7 17.1 10.3 6.74 4.07 2.46 1.71 1.18 0.87 0.61 0.45 0.36 0.31 0.26 0.21 0.19 0.18 0 0
Value of Vd for 3ϕ 4w 102 65 39 26 15 9 7 4 3 2 2 1 1 1 1 1 1 0 0
Value of Vd for 1ϕ 1w 59 38 23 15 9 5 4 3 2 1 1 1 1 1 0 0 0 0 0
Value of Vd for 1ϕ 2w 117 75 45 30 18 11 8 5 4 3 2 2 1 1 1 1 1 0 0
Correction factors
Temperature 30 35 40 45 50 55 60 65 THE MAXIMUM PERMISSIBLE VOLTAGE DROP
factor 1 0.94 0.87 0.79 0.71 0.61 0.5 0.35 IN A POWER INDUSTRIAL CIRCUIT SHOULD NOT BE
Grouping 1 2 3 4 5 7 10 - MORE THAN 5% OF THE DECLARE SUPPLY VOLTAGE
factor 1 0.8 0.7 0.65 0.6 0.54 0.48 - BS 7671

Copper/ PVC/ Non Armoured/ Single Core


size 1 1.5 2.5 4 6 10 16 25 35 50 70 95 120 150 180 240 300 400 500 630
current 16 20 26 36 45 61 81 106 130 160 200 240 280 320 365 430 500 610 710 820
voltage 37 24 15 9.2 6.2 3.7 2.3 1.5 1.1 0.82 0.59 0.45 0.38 0.34 0.3 0.27 0.25 0.24 0.23 0.22

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