Electrical conductors

Electrical Conductors: On the top of my head, resistivity is one of the element in the Ohm law.

Resistant = resistivity x Length /Area.
(Let me know if I'm wrong)

Resistance is a measure of an element's ability to dissipate power irreversibly.

Materials that are good electrical insulators have a high value of resistivity.

For practical application,should we care what conductors to be used? The simple answer is yes because it's an important factors to determine cable size. And this type of work is more on engineer side rather than designer side.

Conductors such as Copper and Aluminum. Copper is the most common because it's cheaper.

Minimum Conductor Size

National Electrical Code requires minimum size of conductors based on conductor voltage rating range. View Table 310.5 NEC 2008

Conductor Voltage Rating (Volts)	Copper	Aluminum
0-2000	14	12
2001-8000	8	8
8001-15000	2	2
15001-28000	1	1
28001-35000	1/0	1/0

Reference

National Electrical Code 2008

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