Square mils

B.t.u. Calories (gram) 252 Circular mils Square mils 0.7854... 

You can make your own tab and bus wire. Copper foil is available in thicknesses from. 002 to. 021 from McMaster-Carr or another supplier. It can be cut into thin strips to your particular specifications. You can also use flat grounding braid for bus ribbon, as it is made for heavier current carrying capacity. Grounding braid comes in a variety of thicknesses and widths and is usually tinned. Make sure to use Tinnit to tin the tab and bus if you make your own - it also helps to minimize oxidation. You can use round wire, either solid or stranded, for bus connections as well as cell connects, if you desire, but the flat ribbon is probably easier to work with. Square mils... 

She Current carrying Reslstanca/ Circular mils Square mil AWfi cagacliv / amps ahmspertt.e qukaleni... 

As an example, consider a bus ribbon. 020" thick and /32" wide. Convert /32" into its decimal equivalent (.21875) and move the decimal place to 218.75 because 1 mil =. 001". Then multiply 218.75 times 20, which gives you 4375 square mils. Either check the table or convert these square mils to circular mils by dividing 4375 by. 7854, which is 5570 circular mils. As you can see from looking at the conversion table, this figure falls between a 14 and 12 gauge, and any wire size within this range would be sufficient to carry 20 amps. 

One square mil equals. 001". To find the current carrying capacity of square or rectangular shaped conductors such as bus ribbon, multiply the thickness in inches times the width in inches. The result will be the square mils of the conductor. The table on the previous page gives the carrying capacity based on square mils. 

Figure 10.3 Various structures of moiecuiar junctions commoniy used in moiecuiar eiec-tronics (a) Cross junction formed by perpen-dicuiariy oriented bottom and top contacts with a moiecuiar iayer sandwiched between the conductors. Typicai junction sizes range from severai square microns to a square mil-iimeter. (b) An aii-carbon molecular junction formed using pyrolyzed photoresist film (PPF) (on SiOj support) as a bottom contact, an evaporated carbon (eC) top contact, and a molecular layer consisting of a multilayer of biphenyl grafted using diazonium chemistry.

Diameters are given in mils (1 mil. 001 in), and area in square mils (1 sq mil. 000001 sq in). For sections and masses for one-tenth the diameters given, divide by 100 and for sections and masses for ten times the diameter multiply by 100. 

---