Please note where iron falls with conductivity and resistivity.
From
HERE" Metal Conductivity
Conduction in metals must follow Ohm's Law, which states that the current is directly proportional to the electric field applied to the metal. The law, named after German physicist Georg Ohm, appeared in 1827 in a published paper laying out how current and voltage are measured via electrical ?circuits. The key variable in applying Ohm's Law is a metal's resistivity.
Resistivity is the opposite of electrical conductivity, evaluating how strongly a metal opposes the flow of electric current. This is commonly measured across the opposite faces of a one-meter cube of material and described as an ohm meter (O·m). Resistivity is often represented by the Greek letter rho (?).
Electrical conductivity, on the other hand, is commonly measured by siemens per meter (S·m-1) and represented by the Greek letter sigma (s). One siemens is equal to the reciprocal of one ohm. "
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In the chart above, you will notice that iron falls 16 spots below Copper in conductivity..
Even Tungsten which is used in incandescent light bulbs for the filament has less resistance than iron!
So, with that chart above, you have silver, copper, gold, then aluminum as the top best conductors of electricity..
Aluminum would be a better choice for a Buss bar than iron/steel..
