fuse size

[btnhfan 5,000+ posts]

what size should i fuse a 4 guage wire for that is a few feet long, and what size should i fuse for an 8 guage wire that is a few feet long?

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[davidfre21 5,000+ posts]

really depends on how much power u plan to run anything over 1000 id run atleast a 100a

 

[KaeZoo 10+ year member]

No more than 120 amps for the 4-guage, and no more than 50 amps for the 8-guage. Wire length doesn't matter when selecting a fuse rating.

 

[supraman1379 10+ year member]

I have a 60amp fuse with my four guage.

 

[BIG_SUPERMAN72 10+ year member]

sammmmeee.....

 

[NegativeEffect1 10+ year member]

100amp circut breaker is what i use on my 4gauge

 

[jleecong 10+ year member]

 

[squeak9798 5,000+ posts]

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Wire length doesn't matter when selecting a fuse rating.

 

[KaeZoo 10+ year member]

The chart displayed is for selecting wire guage, not fuse size.

Wires need to be thicker over longer runs to avoid voltage drops. The chart shows what wire guage should be used for a given current, to keep voltage drop to an acceptable level.

Fuses have nothing to do with voltage drop; they're intended to keep the ampacity of the wire from being exceeded. Ampacity is the amount of current the wire can handle safely, without regard to voltage drop; and the ampacity of a 20 foot piece of wire is the same as a 1 foot piece. The fuse just has to blow before the insulation melts. The length of the wire isn't relevant.