<VV> Blowing fuses

Hugo Miller hugo at aruncoaches.co.uk
Sun May 3 21:38:52 EDT 2020

Thank you - of course I already knew all that. No idea what I was 
thinking - I think this lock-down has got to my brain!

n 2020-05-04 00:15, David Neale via VirtualVairs wrote:
> Hugo, the 12 volt test bulb cannot, and will not, blow. The fuse is a
> piece of metal, most commonly a piece of wire, of very low 
> resistance,
> intentionally designed and dimensioned to be the weak link in the
> circuit. The heavier the current it must pass without fusing, the
> thicker the wire will be. The circuit voltage is immaterial here.
> Every fuse has an upper voltage limit; in the case of our Corvair
> fuses, many times the normal system voltage. Note that a 10 amp fuse
> for the Corvair will be as happy as a pig in you-know-what if 
> inserted
> into a 24 volt system. The fuse doesn't care what the system voltage
> is.  A bulb has a high resistance when hot, attained extremely 
> quickly
> here. Placing the bulb across the fuse terminals in this case merely
> presents the bulb with a nominal positive 12 volts on one side, and 
> in
> the fault condition subject of this discussion, essentially an earth,
> or ground. In other words, just what the bulb requires, just what it
> is designed for.  If this explanat
>  ion doesn't satisfy you, use one of your 24 volt coach bulbs,
> instead. It'll still light up, albeit dimly.
> David Neale, in leafy Leicestershire, England.
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