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Cable Resistance ( 20 Degree Vs 90 Degree Celsius)

Nick Parker

While reading the cable parameters from the OEM catalogue, I see that  cable resistances are produced for both AC (at 90 degree celcius) and DC (at 20 degree Celsius).

Some other manufacturer catalogue also shows both AC resistance (@ 90 degree Celsius) and DC resistance (@ 20 degree Celsius).

Now the questions,

1. Why not the DC resistance @ 90 degree Celsius?

2. Which resistance to be used for cable sizing? for both AC and DC applications?

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    Well, are you sizing for voltage drop on a long run - cool cables, or maximum power transfer on a short run - hot cables?

    AC and Dc resistance will be the same except for very large CSA where EM effects push the current out of the core of the wire to the outer.

    AC reactance (inductance) depends on the layout of the flow and return currents, and is a measure of the energy spent and recovered creating, destroying and then  reversing the magnetic fields around the wires, and is not usually an issue where L and N are close and low current.

    Mike.

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  • 0

    Well, are you sizing for voltage drop on a long run - cool cables, or maximum power transfer on a short run - hot cables?

    AC and Dc resistance will be the same except for very large CSA where EM effects push the current out of the core of the wire to the outer.

    AC reactance (inductance) depends on the layout of the flow and return currents, and is a measure of the energy spent and recovered creating, destroying and then  reversing the magnetic fields around the wires, and is not usually an issue where L and N are close and low current.

    Mike.

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