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DC Resistance & Conductivity

This document provides formulas for calculating temperature correction factor, DC resistance, cross-sectional area, volume resistivity, conductivity, and percentage International Annealed Copper Standard (%IACS) for electrical cables based on measurements of resistance at different temperatures. It defines the formulas and variables needed to make these calculations for a cable sample using its measured resistance, diameter, and material type.

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Abdullah Al Asik
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72 views1 page

DC Resistance & Conductivity

This document provides formulas for calculating temperature correction factor, DC resistance, cross-sectional area, volume resistivity, conductivity, and percentage International Annealed Copper Standard (%IACS) for electrical cables based on measurements of resistance at different temperatures. It defines the formulas and variables needed to make these calculations for a cable sample using its measured resistance, diameter, and material type.

Uploaded by

Abdullah Al Asik
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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PARTEX CABLES LIMITED

14/1, Bangashason, Bandar, Narayanganj, Bangladesh

DC Resistance and Conductivity

1
Temperature Correction Factor Formula, TCF =
1+ α (Rt −20 ° C )
Where, Rt = Room Temperature, ⁰C
For Annealed copper, α = 0.00393
For Aluminium, α = 0.00403
TCF =

Measured DC Resistance, Rm = Ω/m at 29⁰C

DC Resistance, R = Rm x TCF = Ω/km at 20⁰C

π x d²
Cross Sectional Area, A = xN Where, d = wire diameter in mm
4
N = Number of wire
L= meter
A= mm²

RxA
Volume Resistivity, ρ= Ωmm²/km
L
ρ= Ωmm²/m

1
Conductivity, σ = Ʊmm²/m
ρ
σ=

Conductivity
% IACS = x 100
58

% IACS = %

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