Re: [Electric Boats] B&S Etek AWG

 

I've always found it interesting that the bundling derating of current-carrying capacity is only applied to circuits of 50V or more
(p.55 USCG Boatbuilder's Handbook).

Anybody know why that is?

-Tom

--- In electricboats@yahoogroups.com, "The_BearBoat" <cjohnson@...> wrote:
>
>
>
> 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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