James,
Can you please reference which specific "chapter and verse" of ABYC you're looking at? Your numbers look awfully conservative to me. Not that there's anything wrong with being conservative, but I think it is possible to overdo it. For instance putting big stiff cables on too small terminals can cause problems.
Anyhoo, I think it could be a worthwhile excercise to work through a "test case" scenario here on the forum, listing specific pertinant ABYC guidelines along with operating assumtions and such, with the goal of arriving at what would be considered an "approved" installation.
From what I've seen of the ABYC guidelines there is room for interpretation in a lot of areas.
What do you think?
Jim McMillan
--- In electricboats@yahoogroups.com, James Lambden <james@...> wrote:
>
> Richard,
>
>
>
> According to ABYC code:
>
> 00 cable with 105 degree C insulation temperature
>
> - in an engine space 162 amps
> - outside engine space max 30 degrees C ambient temperature: 182 amps
>
> 000 cable with 105 degree C insulation rating
>
> - in an engine space 187 amps
> - outside an engine space max 30 degrees C ambient temperature : 237 amps
>
> 0000 cable with 105 degree C insulation rating
>
> - in an engine space 209 amps
> - outside an engine space max 30 degrees C : 266 amps
>
>
> As a general rule of thumb we are even more conservative, recommending 100 amps on a 2/0 cable.
>
> What is very important to consider is the crimp, and the contact area of the lug, to avoid hot spots.
>
>
> James
>
>
> http://www.propulsionmarine.com
>
>
>
>
> On Mar 13, 2011, at 3:53 PM, Richard Mair wrote:
>
> > Just wondering what wire sizes people are using to set up the series connections on the batteries and connect them to the motor..
> > 48 volt system with a max draw of 100 amps. Most times I expect to be in the 20 amp range from the anticipated figures
> > Thanks Richard
> >
> >
>
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