Thanks for the info Randall, I've been looking for a fuse conversion chart.
Mark Ascherl
1981 TR8 DHC FI
Raleigh, NC
----- Original Message -----
From: "Randall Young" <randallyoung@earthlink.net>
Cc: <triumphs@autox.team.net>; <spitfires@autox.team.net>
Sent: Wednesday, September 20, 2000 1:00 PM
Subject: Re: Lucas fuses
>
> Mark :
>
> The definition of an Ampere has remained the same, however, the method
> of rating fuses is/was somewhat different in different parts of the
> world.
>
> The original Lucas fuses were rated in terms of maximum fault current.
> IOW, a Lucas 50 amp fuse is supposed to blow if you run 50 amps through
> it, but may or may not blow if you only run 49 amps through it.
>
> The US standard (which I believe is now used in most parts of the world)
> rates a fuse in terms of minimum carry current. IOW, a 25 amp fuse is
> supposed to carry 25 amps, but may or may not blow if you run 26 amps
> through it. (Obviously, I'm simplifying here. Fuse manufacturers will
> share with you all kinds of data on their fuses, including complete
> characterization curves, if you ask.)
>
> I found a nice substitution chart on the jag-lover's site :
>
> Simon S. Johnson sends the following data: "...the source: a
> 1974
> edition of "Buss Fuse Car and Truck List" which has on the
> back cover a
> section call "Foreign Car Fuse Replacement Data," -- foreign
> to the US,
> that is. It states that "English standards differ from US
> standards.
> This accounts for difference in ampere ratings." Then it
> provides a
> list:
>
> English Type Buss Replacement
> 50 amp AGC 30
> 35 amp AGC 25
> 30 amp AGC 20
> 25 amp AGC 15
> 20 amp AGC 10
> 10 amp AGC 7 1/2
> 5 amp AGC 3
>
> Randall
>
> Mark Gendron wrote:
> >
> > Ok, I think I got into this conversation a bit late. Are the Lucas fuse
> > ratings not directly equivalent to modern fuse ratings? What's the story
on
> > this? Has the concept of an Ampere changed in the last few decades?
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