Auto Power Environment

[don.broadus at exeloncorp.com]

>From what I've read 42 volts was the highest voltage allowed by certain
safety agencies, 56 volts was considered but exceeded safety guidelines,
(read shock hazard)  Car companies are looking at power levels in the 5 to
10KW range and higher,
any way to keep the current as low as possible was considered.  

> -----Original Message-----
> From:	ae2598 at wayne.edu [SMTP:ae2598 at wayne.edu]
> Sent:	Monday, November 27, 2000 2:16 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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> 
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