Two grades of Aluminium is widely used as per IS 5082
*S - Siemens
M - As manufactured
H1 - Quarter hard
W - Material which has been solution treated
WP- Material which has been solution treated and precipitation treated
For example – let us suppose that the conductivity of Aluminium for grade 63401-WP as measured is found to be 3.825 μ Ω cm for auto certain sample. The heat generated in the bus bar = I² R will be
22% more than that of a good busbar, hence, the conductivity /resistivity finds relevance in usage. The conductivity can be measured by auto conductivity meter or by passing a known current through the conductor and measuring the voltage drop across it.
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