Many automobiles use fusible links instead of fuses in their 12v power distribution. These links are of certain area and certain length. I have repeatedly read that the link should be 4 wire sizes smaller than the wire it is connected to (a #14 link will protect #8 wiring).
How is this 4 size rule determined and how is the length of the link determined?
How is this 4 size rule determined and how is the length of the link determined?