[Milsurplus] Fuses to protect transformers

[Bob Camp]

Hi

Heathkit = might be built by anybody
Anybody = might be color blind
Green wire goes to ….

If you ever have energized a 200A 3 phase circuit that had the neutral and one hot confused (been there done that - didn’t wire it though), you *know* what can happen. 

With two phase at house levels it’s not quite as exciting. You still could damage something. 

Bob

On Mar 17, 2014, at 9:06 PM, Richard Brunner <brunneraa1p at comcast.net> wrote:

> No advantage that I can see.  I would put the fuse in the hot leg, because
> if it's in the neutral leg and blows the hot wire is still live in the
> chassis.  Fuses are pretty reliable, and the worst thing that can happen is
> it fails open.  I don't think much thought was given to the dual fuse plug.
> 
> Addendum:  Re; Heathkit dual fuse plug.  They probably thought both fuses would blow, isolating the chassis.  They might, but would you bet your life on it?
> 
> Richard, AA1P
> 
> 
>> Maybe I missed this but is there any advantage to fusing both sides of the
>> primary?  I remember the famous Heathkit plugs with twin fuses.  Was the
>> redundancy there for a reason?
>> Doug
>> 
> 
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