Hello
I am trying to find a way to make my own fuse out of a piece of wire.
Nominal work amperage is 60A and I want the fuse around 90A .
Can I achieve this with a piece of alluminium or copper wire?
All that I have ever learnt about is how much current you can safely conduct through a wire usually because of isolation reasons.
Can anybody shed some light ? How can I calculate at what amperage I wire will disconnect/melt/burn ?
Help appreciated in advance
Trusty

 

Unsafe, just buy a fuse.

 

Please do NOT try to make your own fuses, particularly for high-power circuits.

When a fuse "blows", a white-hot plasma is produced; it is extremely hot.

A properly engineered fuse keeps this plasma safely contained. It takes a great deal of testing with a wide variety of loads to ensure that a fuse will perform safely under all reasonable (even unreasonable) operating conditions.

If you attempt to design your own fuse, you place yourself and your surroundings at great risk of harm by exposure to this extremely hot and rapidly expanding plasma.

Please do not attempt it.

 

Thank you for the explanation Sgtwookie . I understand

 

I am glad that you understand.

Here is a link to an article in Adobe .PDF format published by Fluke:
http://support.fluke.com/find-sales/Download/Asset/2041429_6001_ENG_A_W.PDF

Look at the plasma fireball on page 2. That is a relatively small plasma ball.

Note that the plasma temperature may reach 10,000°

 

Here's a real life situation where two people were killed as a result of using a meter with an inadequate fuse rating.

http://ecmweb.com/ops_maintenance/defective-test-equipment-20100101/?cid=currentissue

Look at Photo 3. That was a hand-held DVM.

Fuses are not something to try to make yourself.