Fusing current for #14 AWG copper

[Willbe]

is about 170A +/- quite a bit.

But, does anybody know how long it takes to melt (actually, to "clear"), so that the I squared T rating of this wire can be calculated?

Then the upstream circuit breakers should have an I^2T rating substantially less than this.

 

[ampedtech]

what is your voltage?
It is not about current. It's about power, as in watts.
more info

 

[ericgibbs]

what is your voltage?
It is not about current. It's about power, as in watts.
more info

Isnt the fuse in effect a 'resistor'.?

And isnt W = I^2 * R

So what you are saying is a 2Amp rated fuse, in a 12V battery circuit for example will not work the same when in a 240Vac mains circuit.?

 

[Nigel Goodwin]

Isnt the fuse in effect a 'resistor'.?

And isnt W = I^2 * R

So what you are saying is a 2Amp rated fuse, in a 12V battery circuit for example will not work the same when in a 240Vac mains circuit.?

Yes, it's nothing to do with the voltage (assuming it's high enough to cause sufficient current to pass) - the only concern with the voltage is how high a voltage the fuse will 'break'.

 

[Hero999]

For higher voltages you need a longer piece of wire to make the arc longer.

DC is much worse than DC, a typical 250V rated fuse will only have a DC rating of 30V.

 

[picbits]

DC is much worse than DC

Must be friday .........

 

[Hero999]

Sorry, that was supposed to be DC is much worse than DC.

 

[ericgibbs]

Sorry, that was supposed to be DC is much worse than DC.

hi hero,
I think you are locked in a time loop.

 

[Hero999]

Is a moderator editing my posts?

I'll try to say this correctly for the last time, I meant DC is worse than AC.

 

[MrAl]

Hi,

Here is my function calculator (for Windows):

https://www.rapideuphoria.com/mafc-103.zip

This zip package includes a file called "EE_Formulas.dat"
in which there is a fusing current formula that includes time.

The zip file is small, and after download you have to open it up and
look for that file and then open that file, or you could use the
calculator to do the calculations too.

 

[Willbe]

Hi,

Here is my function calculator (for Windows):

https://www.rapideuphoria.com/mafc-103.zip

This zip package includes a file called "EE_Formulas.dat"
in which there is a fusing current formula that includes time.

The zip file is small, and after download you have to open it up and
look for that file and then open that file, or you could use the
calculator to do the calculations too.

My computer does weird things with files like these. When I get up the nerve I'll open them!
Here's something someone put me on to
**broken link removed**
"Onderdonk" may be a Dutch name.

 

[MrAl]

Hi there Willbe,

I thought i would introduce you to that calculator because it is
used for various engineering tasks and i thought you would like
that. I dont charge for it or anything, it's free. Since i wrote
the whole program myself i can be sure it is ad free and spy free
and stuff like that. It solves ODE's too (the updated version).

That link you posted was interesting, and it just so happens that
that second formula (by the Dutch guy i guess) is the one that
appears in with my EE calculator. I think i got it out of an
engineering handbook.
Let me know if you do any experiments if you can.

 

[Willbe]

Hi there Willbe,

I thought i would introduce you to that calculator because it is
used for various engineering tasks and i thought you would like
that. I dont charge for it or anything, it's free. Since i wrote
the whole program myself i can be sure it is ad free and spy free
and stuff like that. It solves ODE's too (the updated version).

That link you posted was interesting, and it just so happens that
that second formula (by the Dutch guy i guess) is the one that
appears in with my EE calculator. I think i got it out of an
engineering handbook.
Let me know if you do any experiments if you can.

Thanks. You never know when these come in handy.