Elctrical Resistivities & Temperature Coefficients

The following table is taken from IEC 60287-1-1:2006 and other sources:

SymbolDescriptionResistivity ohm.m at 20 °CTemperature Coefficient 1/K at 20 °CDensitySpecific Heat Capacity
AlAluminium2.8264E-080.004032698921
ATAluminium Tube Armour2.84E-080.004032698921
ATAAluminium Tape Armour2.84E-080.004032698921
AWAAluminium Wire Armour2.84E-080.004032698921
BronzeBronze3.5E-080.0039200377
CuCopper1.724E-080.003938940385
CuponalCuponal (15%)2.65E-080.004013638840
EPR [185]185° Rubber - Thermosetting9302092
EPR [60]60° Rubber - Thermosetting9302092
EPR [85]85° Rubber - Thermosetting9302092
EPR [90]90° Rubber - Thermosetting9302092
HDPEHigh Density Polyethylene9502301
HEPRHard Ethylene Propylene Rubber12501674
LDPELow Density Polyethylene9202092
MDPEMedium Density Polyethylene9352301
Min [Bare]Mineral Bare Sheath3600921
Min [PVC]Mineral PVC Covered3600921
PbLead2.144E-070.00411350130
PURPolyurethane12501674
PVC [TI-1]Polyvinyl Chloride15001674
PVC [TI-3]Heat Resistance PVC15001674
SSStainless Steel7E-077600460
SteelSteel1.38E-070.0047860460
SWASteel Wire Armour1.38E-070.0047860460
TPE-EThermoplastic Polyester Elastomer12301130
TPE-OThermoplastic Polyolefin Elastomer12301130
TPE-SThermoplastic Polystyrene Elastomer10801300
XLPECross Linked Polyethylene9502301
XLPOCross Linked Polyolefin9502301

 

Comments

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Ei Le Dec 12, 2018 6:45 PM
Correct that resistivity in given table is the DC resistivity in https://mycableengineering.com/knowledge-base/conductor-resistance ?

Should it be Ω/m as resistivity is proportional to length?  

How to calculate α20 when temperature in cable is changing? Possible to assumed it's constant in temperature range og 20-90 degrees celcius?
Reply
Steven McFadyen Dec 12, 2018 7:35 PM
The values are the ones you should use for d.c. resistivity and the units are Ω.m.  

For 20 to 90°C, normally people would assume α is constant.  Using a more accurate value is probably not going to make much difference (unless you are doing laboratory type experiments).

If you are interested in how α varies with temperature, an Internet search will give more information.
Reply
Ei Le Dec 12, 2018 7:52 PM
Great, thank you!
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