Formula to work out thickness of wire required?

[nkukard]

HI Guys,

Is there a formula to work out what thickness of wire is required to carry a certain number of amps at a certain voltage?

For instance, I have 0.5mm flex ... how many amps can that carry at 24v?

 

[ericgibbs]

HI Guys,

Is there a formula to work out what thickness of wire is required to carry a certain number of amps at a certain voltage?

For instance, I have 0.5mm flex ... how many amps can that carry at 24v?

hi,
This should help.
American Wire Gauge table and AWG Electrical Current Load Limits with skin depth frequencies

 

[RCinFLA]

Wire size for amperage is based on acceptable heat generated per unit length. House wiring standards for amperage is based on about 1 to 2 watts per foot maximum heat generation. It is less amperage for wire that has heavy insulation or placed in a plastic conduit which reduces ability to dissipate heat. Example of this is SOOW heavy extension cord wire. Power dissipation is I^2*R where R is the resistance of the wire.

Voltage is not a factor other then the insulation placed on the wire.