[Electric Boats] Re: B&S Etek AWG

 

The derivation of all of the tables and charts for voltage drop calculations is:

CM = (K x I x L)/E

where:
CM ➜ area of conductor in circular mils
K ➜ 10.75, a constant representing the resistivity of copper
L ➜ circuit length in feet
E ➜ maximum allowable voltage drop, at load, in volts (e.g.; 3% voltage drop in a 72VDC system would be 6.97VDC)

Note that this formula does not take into account the loss of heat transfer capability from an individual conductor as a result of bundling the conductors or running them in a conduit or chase.

Hope this helps.
Charlie

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