Auto Power Environment

[Marteney, Steven J.]

Isn't an automotive power system (not saying a battery) typically 13.8V or
14V (aka alternator output)?  I thought logically mutiplying that by 3 gets
you 42V.  Other than that, I never seen it explained in all that I've read
about it.

Steve

-----Original Message-----
From: ae2598 at wayne.edu [mailto:ae2598 at wayne.edu]
Sent: Monday, November 27, 2000 3:16 PM
To: gmecm at diy-efi.org
Subject: Re: Auto Power Environment


I've heard that 42VDC systems are going to happen pretty soon, to reduce
the current and thus, the size of the conductors.  What I'm wondering
though, is where they came up with the number 42? (Yes I know, it is the
meaning of life :)  but other than that, is 42VDC used anywhere?  24VDC is
a "magic number", it is the standard voltage for industrial control
systems.  I've heard that utility substations use 100VDC for some reason.
but 42V?!

 On Mon, 27 Nov 2000, Mike Turner/ENGR/HQ/KEMET/US wrote:

> 
> Some time ago, there was a discussion of the theoretical 12vdc automotive
> power environment such as reversed battery, battery jump start, cranking,
> etc. I looked in the archives but could not find a pointer to a place
where
> all those conditions are listed. Could someone point me to a source for
> this info? Since 42vdc seems to be coming Real Soon Now, is there a source
> for this, too? I'm hoping for something free but SAE or IEEE would do if
> nothing else is found. TIA.
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